Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Core of Xen paravirt_ops implementation. |
| 3 | * |
| 4 | * This file contains the xen_paravirt_ops structure itself, and the |
| 5 | * implementations for: |
| 6 | * - privileged instructions |
| 7 | * - interrupt flags |
| 8 | * - segment operations |
| 9 | * - booting and setup |
| 10 | * |
| 11 | * Jeremy Fitzhardinge <jeremy@xensource.com>, XenSource Inc, 2007 |
| 12 | */ |
| 13 | |
Sheng Yang | 38e20b0 | 2010-05-14 12:40:51 +0100 | [diff] [blame] | 14 | #include <linux/cpu.h> |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 15 | #include <linux/kernel.h> |
| 16 | #include <linux/init.h> |
| 17 | #include <linux/smp.h> |
| 18 | #include <linux/preempt.h> |
Jeremy Fitzhardinge | f120f13 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 19 | #include <linux/hardirq.h> |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 20 | #include <linux/percpu.h> |
| 21 | #include <linux/delay.h> |
| 22 | #include <linux/start_kernel.h> |
| 23 | #include <linux/sched.h> |
Jeremy Fitzhardinge | 6cac5a9 | 2009-03-29 19:56:29 -0700 | [diff] [blame] | 24 | #include <linux/kprobes.h> |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 25 | #include <linux/bootmem.h> |
| 26 | #include <linux/module.h> |
Jeremy Fitzhardinge | f4f97b3 | 2007-07-17 18:37:05 -0700 | [diff] [blame] | 27 | #include <linux/mm.h> |
| 28 | #include <linux/page-flags.h> |
| 29 | #include <linux/highmem.h> |
Markus Armbruster | b8c2d3d | 2008-02-27 14:56:35 +0100 | [diff] [blame] | 30 | #include <linux/console.h> |
Chris Wright | 5d990b6 | 2009-12-04 12:15:21 -0800 | [diff] [blame] | 31 | #include <linux/pci.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 32 | #include <linux/gfp.h> |
Jeremy Fitzhardinge | 236260b | 2010-10-06 15:52:29 -0700 | [diff] [blame] | 33 | #include <linux/memblock.h> |
David Vrabel | 96f28bc | 2013-04-03 17:31:50 +0100 | [diff] [blame] | 34 | #include <linux/edd.h> |
Josh Poimboeuf | 983bb6d | 2016-02-28 22:22:36 -0600 | [diff] [blame] | 35 | #include <linux/frame.h> |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 36 | |
Vitaly Kuznetsov | 0b34a16 | 2015-09-25 11:59:52 +0200 | [diff] [blame] | 37 | #ifdef CONFIG_KEXEC_CORE |
| 38 | #include <linux/kexec.h> |
| 39 | #endif |
| 40 | |
Jeremy Fitzhardinge | 1ccbf53 | 2009-10-06 15:11:14 -0700 | [diff] [blame] | 41 | #include <xen/xen.h> |
Stefano Stabellini | 0ec53ec | 2012-09-14 13:37:32 +0000 | [diff] [blame] | 42 | #include <xen/events.h> |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 43 | #include <xen/interface/xen.h> |
Jeremy Fitzhardinge | ecbf29c | 2008-12-16 12:37:07 -0800 | [diff] [blame] | 44 | #include <xen/interface/version.h> |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 45 | #include <xen/interface/physdev.h> |
| 46 | #include <xen/interface/vcpu.h> |
Sheng Yang | bee6ab5 | 2010-05-14 12:39:33 +0100 | [diff] [blame] | 47 | #include <xen/interface/memory.h> |
Jan Beulich | f221b04 | 2015-01-13 07:40:05 +0000 | [diff] [blame] | 48 | #include <xen/interface/nmi.h> |
Liu, Jinsong | cef12ee | 2012-06-07 19:56:51 +0800 | [diff] [blame] | 49 | #include <xen/interface/xen-mca.h> |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 50 | #include <xen/features.h> |
| 51 | #include <xen/page.h> |
Sheng Yang | 38e20b0 | 2010-05-14 12:40:51 +0100 | [diff] [blame] | 52 | #include <xen/hvm.h> |
Jeremy Fitzhardinge | 084a2a4 | 2008-07-08 15:06:50 -0700 | [diff] [blame] | 53 | #include <xen/hvc-console.h> |
Konrad Rzeszutek Wilk | 211063d | 2011-12-08 17:32:23 +0800 | [diff] [blame] | 54 | #include <xen/acpi.h> |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 55 | |
| 56 | #include <asm/paravirt.h> |
Ingo Molnar | 7b6aa33 | 2009-02-17 13:58:15 +0100 | [diff] [blame] | 57 | #include <asm/apic.h> |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 58 | #include <asm/page.h> |
Alex Nixon | b5401a9 | 2010-03-18 16:31:34 -0400 | [diff] [blame] | 59 | #include <asm/xen/pci.h> |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 60 | #include <asm/xen/hypercall.h> |
| 61 | #include <asm/xen/hypervisor.h> |
| 62 | #include <asm/fixmap.h> |
| 63 | #include <asm/processor.h> |
Jeremy Fitzhardinge | 707ebbc | 2009-03-27 11:29:02 -0700 | [diff] [blame] | 64 | #include <asm/proto.h> |
Jeremy Fitzhardinge | 1153968 | 2008-07-08 15:07:16 -0700 | [diff] [blame] | 65 | #include <asm/msr-index.h> |
Jeremy Fitzhardinge | 6cac5a9 | 2009-03-29 19:56:29 -0700 | [diff] [blame] | 66 | #include <asm/traps.h> |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 67 | #include <asm/setup.h> |
| 68 | #include <asm/desc.h> |
Ian Campbell | 817a824 | 2010-02-26 17:16:00 +0000 | [diff] [blame] | 69 | #include <asm/pgalloc.h> |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 70 | #include <asm/pgtable.h> |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 71 | #include <asm/tlbflush.h> |
Jeremy Fitzhardinge | fefa629 | 2007-07-17 18:37:07 -0700 | [diff] [blame] | 72 | #include <asm/reboot.h> |
Jeremy Fitzhardinge | 577eebe | 2009-08-27 12:46:35 -0700 | [diff] [blame] | 73 | #include <asm/stackprotector.h> |
Sheng Yang | bee6ab5 | 2010-05-14 12:39:33 +0100 | [diff] [blame] | 74 | #include <asm/hypervisor.h> |
Jan Beulich | f221b04 | 2015-01-13 07:40:05 +0000 | [diff] [blame] | 75 | #include <asm/mach_traps.h> |
Konrad Rzeszutek Wilk | 73c154c | 2012-02-13 22:26:32 -0500 | [diff] [blame] | 76 | #include <asm/mwait.h> |
David Vrabel | 76a8df7 | 2012-05-04 14:29:46 +0100 | [diff] [blame] | 77 | #include <asm/pci_x86.h> |
Konrad Rzeszutek Wilk | c79c498 | 2013-02-26 12:51:27 -0500 | [diff] [blame] | 78 | #include <asm/pat.h> |
Stefano Stabellini | a314e3e | 2015-10-22 16:20:46 +0000 | [diff] [blame] | 79 | #include <asm/cpu.h> |
Konrad Rzeszutek Wilk | 73c154c | 2012-02-13 22:26:32 -0500 | [diff] [blame] | 80 | |
| 81 | #ifdef CONFIG_ACPI |
| 82 | #include <linux/acpi.h> |
| 83 | #include <asm/acpi.h> |
| 84 | #include <acpi/pdc_intel.h> |
| 85 | #include <acpi/processor.h> |
| 86 | #include <xen/interface/platform.h> |
| 87 | #endif |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 88 | |
| 89 | #include "xen-ops.h" |
Jeremy Fitzhardinge | 3b827c1 | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 90 | #include "mmu.h" |
Ben Guthro | f447d56 | 2012-04-21 00:11:04 +0800 | [diff] [blame] | 91 | #include "smp.h" |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 92 | #include "multicalls.h" |
Boris Ostrovsky | 65d0cf0 | 2015-08-10 16:34:34 -0400 | [diff] [blame] | 93 | #include "pmu.h" |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 94 | |
| 95 | EXPORT_SYMBOL_GPL(hypercall_page); |
| 96 | |
Konrad Rzeszutek Wilk | a520996 | 2013-05-05 08:51:47 -0400 | [diff] [blame] | 97 | /* |
| 98 | * Pointer to the xen_vcpu_info structure or |
| 99 | * &HYPERVISOR_shared_info->vcpu_info[cpu]. See xen_hvm_init_shared_info |
| 100 | * and xen_vcpu_setup for details. By default it points to share_info->vcpu_info |
| 101 | * but if the hypervisor supports VCPUOP_register_vcpu_info then it can point |
| 102 | * to xen_vcpu_info. The pointer is used in __xen_evtchn_do_upcall to |
| 103 | * acknowledge pending events. |
| 104 | * Also more subtly it is used by the patched version of irq enable/disable |
| 105 | * e.g. xen_irq_enable_direct and xen_iret in PV mode. |
| 106 | * |
| 107 | * The desire to be able to do those mask/unmask operations as a single |
| 108 | * instruction by using the per-cpu offset held in %gs is the real reason |
| 109 | * vcpu info is in a per-cpu pointer and the original reason for this |
| 110 | * hypercall. |
| 111 | * |
| 112 | */ |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 113 | DEFINE_PER_CPU(struct vcpu_info *, xen_vcpu); |
Konrad Rzeszutek Wilk | a520996 | 2013-05-05 08:51:47 -0400 | [diff] [blame] | 114 | |
| 115 | /* |
| 116 | * Per CPU pages used if hypervisor supports VCPUOP_register_vcpu_info |
| 117 | * hypercall. This can be used both in PV and PVHVM mode. The structure |
| 118 | * overrides the default per_cpu(xen_vcpu, cpu) value. |
| 119 | */ |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 120 | DEFINE_PER_CPU(struct vcpu_info, xen_vcpu_info); |
Jeremy Fitzhardinge | 9f79991 | 2007-10-16 11:51:30 -0700 | [diff] [blame] | 121 | |
Jeremy Fitzhardinge | 6e83358 | 2008-08-19 13:16:17 -0700 | [diff] [blame] | 122 | enum xen_domain_type xen_domain_type = XEN_NATIVE; |
| 123 | EXPORT_SYMBOL_GPL(xen_domain_type); |
| 124 | |
Ian Campbell | 7e77506 | 2010-09-30 12:37:26 +0100 | [diff] [blame] | 125 | unsigned long *machine_to_phys_mapping = (void *)MACH2PHYS_VIRT_START; |
| 126 | EXPORT_SYMBOL(machine_to_phys_mapping); |
Jan Beulich | ccbcdf7 | 2011-08-16 15:07:41 +0100 | [diff] [blame] | 127 | unsigned long machine_to_phys_nr; |
| 128 | EXPORT_SYMBOL(machine_to_phys_nr); |
Ian Campbell | 7e77506 | 2010-09-30 12:37:26 +0100 | [diff] [blame] | 129 | |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 130 | struct start_info *xen_start_info; |
| 131 | EXPORT_SYMBOL_GPL(xen_start_info); |
| 132 | |
Jeremy Fitzhardinge | a0d695c | 2008-05-26 23:31:21 +0100 | [diff] [blame] | 133 | struct shared_info xen_dummy_shared_info; |
Jeremy Fitzhardinge | 60223a3 | 2007-07-17 18:37:07 -0700 | [diff] [blame] | 134 | |
Jeremy Fitzhardinge | 3834143 | 2009-02-02 13:55:31 -0800 | [diff] [blame] | 135 | void *xen_initial_gdt; |
| 136 | |
Sheng Yang | bee6ab5 | 2010-05-14 12:39:33 +0100 | [diff] [blame] | 137 | RESERVE_BRK(shared_info_page_brk, PAGE_SIZE); |
Sheng Yang | 38e20b0 | 2010-05-14 12:40:51 +0100 | [diff] [blame] | 138 | __read_mostly int xen_have_vector_callback; |
| 139 | EXPORT_SYMBOL_GPL(xen_have_vector_callback); |
Sheng Yang | bee6ab5 | 2010-05-14 12:39:33 +0100 | [diff] [blame] | 140 | |
Jeremy Fitzhardinge | 60223a3 | 2007-07-17 18:37:07 -0700 | [diff] [blame] | 141 | /* |
| 142 | * Point at some empty memory to start with. We map the real shared_info |
| 143 | * page as soon as fixmap is up and running. |
| 144 | */ |
Olaf Hering | 4648da7 | 2012-07-17 11:57:41 +0200 | [diff] [blame] | 145 | struct shared_info *HYPERVISOR_shared_info = &xen_dummy_shared_info; |
Jeremy Fitzhardinge | 60223a3 | 2007-07-17 18:37:07 -0700 | [diff] [blame] | 146 | |
| 147 | /* |
| 148 | * Flag to determine whether vcpu info placement is available on all |
| 149 | * VCPUs. We assume it is to start with, and then set it to zero on |
| 150 | * the first failure. This is because it can succeed on some VCPUs |
| 151 | * and not others, since it can involve hypervisor memory allocation, |
| 152 | * or because the guest failed to guarantee all the appropriate |
| 153 | * constraints on all VCPUs (ie buffer can't cross a page boundary). |
| 154 | * |
| 155 | * Note that any particular CPU may be using a placed vcpu structure, |
| 156 | * but we can only optimise if the all are. |
| 157 | * |
| 158 | * 0: not available, 1: available |
| 159 | */ |
Jeremy Fitzhardinge | e4d0407 | 2009-02-02 13:55:54 -0800 | [diff] [blame] | 160 | static int have_vcpu_info_placement = 1; |
Jeremy Fitzhardinge | 60223a3 | 2007-07-17 18:37:07 -0700 | [diff] [blame] | 161 | |
David Vrabel | 1c32cdc | 2012-07-09 11:39:08 +0100 | [diff] [blame] | 162 | struct tls_descs { |
| 163 | struct desc_struct desc[3]; |
| 164 | }; |
| 165 | |
| 166 | /* |
| 167 | * Updating the 3 TLS descriptors in the GDT on every task switch is |
| 168 | * surprisingly expensive so we avoid updating them if they haven't |
| 169 | * changed. Since Xen writes different descriptors than the one |
| 170 | * passed in the update_descriptor hypercall we keep shadow copies to |
| 171 | * compare against. |
| 172 | */ |
| 173 | static DEFINE_PER_CPU(struct tls_descs, shadow_tls_desc); |
| 174 | |
Mukesh Rathor | c06ee78 | 2010-07-19 10:25:08 -0700 | [diff] [blame] | 175 | static void clamp_max_cpus(void) |
| 176 | { |
| 177 | #ifdef CONFIG_SMP |
| 178 | if (setup_max_cpus > MAX_VIRT_CPUS) |
| 179 | setup_max_cpus = MAX_VIRT_CPUS; |
| 180 | #endif |
| 181 | } |
| 182 | |
Jeremy Fitzhardinge | 9c7a794 | 2008-05-31 01:33:02 +0100 | [diff] [blame] | 183 | static void xen_vcpu_setup(int cpu) |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 184 | { |
Jeremy Fitzhardinge | 60223a3 | 2007-07-17 18:37:07 -0700 | [diff] [blame] | 185 | struct vcpu_register_vcpu_info info; |
| 186 | int err; |
| 187 | struct vcpu_info *vcpup; |
| 188 | |
Jeremy Fitzhardinge | a0d695c | 2008-05-26 23:31:21 +0100 | [diff] [blame] | 189 | BUG_ON(HYPERVISOR_shared_info == &xen_dummy_shared_info); |
Jeremy Fitzhardinge | 60223a3 | 2007-07-17 18:37:07 -0700 | [diff] [blame] | 190 | |
Konrad Rzeszutek Wilk | 7f1fc26 | 2013-05-05 09:30:09 -0400 | [diff] [blame] | 191 | /* |
| 192 | * This path is called twice on PVHVM - first during bootup via |
| 193 | * smp_init -> xen_hvm_cpu_notify, and then if the VCPU is being |
| 194 | * hotplugged: cpu_up -> xen_hvm_cpu_notify. |
| 195 | * As we can only do the VCPUOP_register_vcpu_info once lets |
| 196 | * not over-write its result. |
| 197 | * |
| 198 | * For PV it is called during restore (xen_vcpu_restore) and bootup |
| 199 | * (xen_setup_vcpu_info_placement). The hotplug mechanism does not |
| 200 | * use this function. |
| 201 | */ |
| 202 | if (xen_hvm_domain()) { |
| 203 | if (per_cpu(xen_vcpu, cpu) == &per_cpu(xen_vcpu_info, cpu)) |
| 204 | return; |
| 205 | } |
Mukesh Rathor | c06ee78 | 2010-07-19 10:25:08 -0700 | [diff] [blame] | 206 | if (cpu < MAX_VIRT_CPUS) |
| 207 | per_cpu(xen_vcpu,cpu) = &HYPERVISOR_shared_info->vcpu_info[cpu]; |
| 208 | |
| 209 | if (!have_vcpu_info_placement) { |
| 210 | if (cpu >= MAX_VIRT_CPUS) |
| 211 | clamp_max_cpus(); |
| 212 | return; |
| 213 | } |
Jeremy Fitzhardinge | 60223a3 | 2007-07-17 18:37:07 -0700 | [diff] [blame] | 214 | |
| 215 | vcpup = &per_cpu(xen_vcpu_info, cpu); |
Jeremy Fitzhardinge | 9976b39 | 2009-02-27 09:19:26 -0800 | [diff] [blame] | 216 | info.mfn = arbitrary_virt_to_mfn(vcpup); |
Jeremy Fitzhardinge | 60223a3 | 2007-07-17 18:37:07 -0700 | [diff] [blame] | 217 | info.offset = offset_in_page(vcpup); |
| 218 | |
Jeremy Fitzhardinge | 60223a3 | 2007-07-17 18:37:07 -0700 | [diff] [blame] | 219 | /* Check to see if the hypervisor will put the vcpu_info |
| 220 | structure where we want it, which allows direct access via |
Konrad Rzeszutek Wilk | a520996 | 2013-05-05 08:51:47 -0400 | [diff] [blame] | 221 | a percpu-variable. |
| 222 | N.B. This hypercall can _only_ be called once per CPU. Subsequent |
| 223 | calls will error out with -EINVAL. This is due to the fact that |
| 224 | hypervisor has no unregister variant and this hypercall does not |
| 225 | allow to over-write info.mfn and info.offset. |
| 226 | */ |
Jeremy Fitzhardinge | 60223a3 | 2007-07-17 18:37:07 -0700 | [diff] [blame] | 227 | err = HYPERVISOR_vcpu_op(VCPUOP_register_vcpu_info, cpu, &info); |
| 228 | |
| 229 | if (err) { |
| 230 | printk(KERN_DEBUG "register_vcpu_info failed: err=%d\n", err); |
| 231 | have_vcpu_info_placement = 0; |
Mukesh Rathor | c06ee78 | 2010-07-19 10:25:08 -0700 | [diff] [blame] | 232 | clamp_max_cpus(); |
Jeremy Fitzhardinge | 60223a3 | 2007-07-17 18:37:07 -0700 | [diff] [blame] | 233 | } else { |
| 234 | /* This cpu is using the registered vcpu info, even if |
| 235 | later ones fail to. */ |
| 236 | per_cpu(xen_vcpu, cpu) = vcpup; |
Jeremy Fitzhardinge | 60223a3 | 2007-07-17 18:37:07 -0700 | [diff] [blame] | 237 | } |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 238 | } |
| 239 | |
Jeremy Fitzhardinge | 9c7a794 | 2008-05-31 01:33:02 +0100 | [diff] [blame] | 240 | /* |
| 241 | * On restore, set the vcpu placement up again. |
| 242 | * If it fails, then we're in a bad state, since |
| 243 | * we can't back out from using it... |
| 244 | */ |
| 245 | void xen_vcpu_restore(void) |
| 246 | { |
Jeremy Fitzhardinge | 3905bb2 | 2009-11-21 08:46:29 +0800 | [diff] [blame] | 247 | int cpu; |
Jeremy Fitzhardinge | 9c7a794 | 2008-05-31 01:33:02 +0100 | [diff] [blame] | 248 | |
Wei Liu | 9d328a9 | 2012-12-13 15:33:05 +0000 | [diff] [blame] | 249 | for_each_possible_cpu(cpu) { |
Jeremy Fitzhardinge | 3905bb2 | 2009-11-21 08:46:29 +0800 | [diff] [blame] | 250 | bool other_cpu = (cpu != smp_processor_id()); |
Wei Liu | 9d328a9 | 2012-12-13 15:33:05 +0000 | [diff] [blame] | 251 | bool is_up = HYPERVISOR_vcpu_op(VCPUOP_is_up, cpu, NULL); |
Jeremy Fitzhardinge | 9c7a794 | 2008-05-31 01:33:02 +0100 | [diff] [blame] | 252 | |
Wei Liu | 9d328a9 | 2012-12-13 15:33:05 +0000 | [diff] [blame] | 253 | if (other_cpu && is_up && |
Jeremy Fitzhardinge | 3905bb2 | 2009-11-21 08:46:29 +0800 | [diff] [blame] | 254 | HYPERVISOR_vcpu_op(VCPUOP_down, cpu, NULL)) |
| 255 | BUG(); |
Jeremy Fitzhardinge | 9c7a794 | 2008-05-31 01:33:02 +0100 | [diff] [blame] | 256 | |
Jeremy Fitzhardinge | 3905bb2 | 2009-11-21 08:46:29 +0800 | [diff] [blame] | 257 | xen_setup_runstate_info(cpu); |
Ian Campbell | be01292 | 2009-11-21 08:35:55 +0800 | [diff] [blame] | 258 | |
Jeremy Fitzhardinge | 3905bb2 | 2009-11-21 08:46:29 +0800 | [diff] [blame] | 259 | if (have_vcpu_info_placement) |
Jeremy Fitzhardinge | 9c7a794 | 2008-05-31 01:33:02 +0100 | [diff] [blame] | 260 | xen_vcpu_setup(cpu); |
| 261 | |
Wei Liu | 9d328a9 | 2012-12-13 15:33:05 +0000 | [diff] [blame] | 262 | if (other_cpu && is_up && |
Jeremy Fitzhardinge | 3905bb2 | 2009-11-21 08:46:29 +0800 | [diff] [blame] | 263 | HYPERVISOR_vcpu_op(VCPUOP_up, cpu, NULL)) |
| 264 | BUG(); |
Jeremy Fitzhardinge | 9c7a794 | 2008-05-31 01:33:02 +0100 | [diff] [blame] | 265 | } |
| 266 | } |
| 267 | |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 268 | static void __init xen_banner(void) |
| 269 | { |
Jeremy Fitzhardinge | 95c7c23 | 2008-07-15 13:42:34 -0700 | [diff] [blame] | 270 | unsigned version = HYPERVISOR_xen_version(XENVER_version, NULL); |
| 271 | struct xen_extraversion extra; |
| 272 | HYPERVISOR_xen_version(XENVER_extraversion, &extra); |
| 273 | |
Mukesh Rathor | d285d68 | 2013-12-13 12:45:31 -0500 | [diff] [blame] | 274 | pr_info("Booting paravirtualized kernel %son %s\n", |
| 275 | xen_feature(XENFEAT_auto_translated_physmap) ? |
| 276 | "with PVH extensions " : "", pv_info.name); |
Jeremy Fitzhardinge | 95c7c23 | 2008-07-15 13:42:34 -0700 | [diff] [blame] | 277 | printk(KERN_INFO "Xen version: %d.%d%s%s\n", |
| 278 | version >> 16, version & 0xffff, extra.extraversion, |
Jeremy Fitzhardinge | e57778a | 2008-06-16 04:30:02 -0700 | [diff] [blame] | 279 | xen_feature(XENFEAT_mmu_pt_update_preserve_ad) ? " (preserve-AD)" : ""); |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 280 | } |
Konrad Rzeszutek Wilk | 394b40f | 2012-11-27 11:39:40 -0500 | [diff] [blame] | 281 | /* Check if running on Xen version (major, minor) or later */ |
| 282 | bool |
| 283 | xen_running_on_version_or_later(unsigned int major, unsigned int minor) |
| 284 | { |
| 285 | unsigned int version; |
| 286 | |
| 287 | if (!xen_domain()) |
| 288 | return false; |
| 289 | |
| 290 | version = HYPERVISOR_xen_version(XENVER_version, NULL); |
| 291 | if ((((version >> 16) == major) && ((version & 0xffff) >= minor)) || |
| 292 | ((version >> 16) > major)) |
| 293 | return true; |
| 294 | return false; |
| 295 | } |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 296 | |
Andre Przywara | 5e62625 | 2012-05-29 13:07:31 +0200 | [diff] [blame] | 297 | #define CPUID_THERM_POWER_LEAF 6 |
| 298 | #define APERFMPERF_PRESENT 0 |
| 299 | |
Jeremy Fitzhardinge | e826fe1 | 2009-03-07 17:09:27 -0800 | [diff] [blame] | 300 | static __read_mostly unsigned int cpuid_leaf1_edx_mask = ~0; |
| 301 | static __read_mostly unsigned int cpuid_leaf1_ecx_mask = ~0; |
| 302 | |
Konrad Rzeszutek Wilk | 73c154c | 2012-02-13 22:26:32 -0500 | [diff] [blame] | 303 | static __read_mostly unsigned int cpuid_leaf1_ecx_set_mask; |
| 304 | static __read_mostly unsigned int cpuid_leaf5_ecx_val; |
| 305 | static __read_mostly unsigned int cpuid_leaf5_edx_val; |
| 306 | |
H. Peter Anvin | 65ea5b0 | 2008-01-30 13:30:56 +0100 | [diff] [blame] | 307 | static void xen_cpuid(unsigned int *ax, unsigned int *bx, |
| 308 | unsigned int *cx, unsigned int *dx) |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 309 | { |
Jeremy Fitzhardinge | 82d6469 | 2009-10-22 16:41:15 -0700 | [diff] [blame] | 310 | unsigned maskebx = ~0; |
Jeremy Fitzhardinge | e826fe1 | 2009-03-07 17:09:27 -0800 | [diff] [blame] | 311 | unsigned maskecx = ~0; |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 312 | unsigned maskedx = ~0; |
Konrad Rzeszutek Wilk | 73c154c | 2012-02-13 22:26:32 -0500 | [diff] [blame] | 313 | unsigned setecx = 0; |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 314 | /* |
| 315 | * Mask out inconvenient features, to try and disable as many |
| 316 | * unsupported kernel subsystems as possible. |
| 317 | */ |
Jeremy Fitzhardinge | 82d6469 | 2009-10-22 16:41:15 -0700 | [diff] [blame] | 318 | switch (*ax) { |
| 319 | case 1: |
Jeremy Fitzhardinge | e826fe1 | 2009-03-07 17:09:27 -0800 | [diff] [blame] | 320 | maskecx = cpuid_leaf1_ecx_mask; |
Konrad Rzeszutek Wilk | 73c154c | 2012-02-13 22:26:32 -0500 | [diff] [blame] | 321 | setecx = cpuid_leaf1_ecx_set_mask; |
Jeremy Fitzhardinge | e826fe1 | 2009-03-07 17:09:27 -0800 | [diff] [blame] | 322 | maskedx = cpuid_leaf1_edx_mask; |
Jeremy Fitzhardinge | 82d6469 | 2009-10-22 16:41:15 -0700 | [diff] [blame] | 323 | break; |
| 324 | |
Konrad Rzeszutek Wilk | 73c154c | 2012-02-13 22:26:32 -0500 | [diff] [blame] | 325 | case CPUID_MWAIT_LEAF: |
| 326 | /* Synthesize the values.. */ |
| 327 | *ax = 0; |
| 328 | *bx = 0; |
| 329 | *cx = cpuid_leaf5_ecx_val; |
| 330 | *dx = cpuid_leaf5_edx_val; |
| 331 | return; |
| 332 | |
Andre Przywara | 5e62625 | 2012-05-29 13:07:31 +0200 | [diff] [blame] | 333 | case CPUID_THERM_POWER_LEAF: |
| 334 | /* Disabling APERFMPERF for kernel usage */ |
| 335 | maskecx = ~(1 << APERFMPERF_PRESENT); |
| 336 | break; |
| 337 | |
Jeremy Fitzhardinge | 82d6469 | 2009-10-22 16:41:15 -0700 | [diff] [blame] | 338 | case 0xb: |
| 339 | /* Suppress extended topology stuff */ |
| 340 | maskebx = 0; |
| 341 | break; |
Jeremy Fitzhardinge | e826fe1 | 2009-03-07 17:09:27 -0800 | [diff] [blame] | 342 | } |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 343 | |
| 344 | asm(XEN_EMULATE_PREFIX "cpuid" |
H. Peter Anvin | 65ea5b0 | 2008-01-30 13:30:56 +0100 | [diff] [blame] | 345 | : "=a" (*ax), |
| 346 | "=b" (*bx), |
| 347 | "=c" (*cx), |
| 348 | "=d" (*dx) |
| 349 | : "0" (*ax), "2" (*cx)); |
Jeremy Fitzhardinge | e826fe1 | 2009-03-07 17:09:27 -0800 | [diff] [blame] | 350 | |
Jeremy Fitzhardinge | 82d6469 | 2009-10-22 16:41:15 -0700 | [diff] [blame] | 351 | *bx &= maskebx; |
Jeremy Fitzhardinge | e826fe1 | 2009-03-07 17:09:27 -0800 | [diff] [blame] | 352 | *cx &= maskecx; |
Konrad Rzeszutek Wilk | 73c154c | 2012-02-13 22:26:32 -0500 | [diff] [blame] | 353 | *cx |= setecx; |
H. Peter Anvin | 65ea5b0 | 2008-01-30 13:30:56 +0100 | [diff] [blame] | 354 | *dx &= maskedx; |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 355 | } |
Josh Poimboeuf | 983bb6d | 2016-02-28 22:22:36 -0600 | [diff] [blame] | 356 | STACK_FRAME_NON_STANDARD(xen_cpuid); /* XEN_EMULATE_PREFIX */ |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 357 | |
Konrad Rzeszutek Wilk | 73c154c | 2012-02-13 22:26:32 -0500 | [diff] [blame] | 358 | static bool __init xen_check_mwait(void) |
| 359 | { |
Liu, Jinsong | e3aa4e6 | 2012-11-08 05:44:28 +0000 | [diff] [blame] | 360 | #ifdef CONFIG_ACPI |
Konrad Rzeszutek Wilk | 73c154c | 2012-02-13 22:26:32 -0500 | [diff] [blame] | 361 | struct xen_platform_op op = { |
| 362 | .cmd = XENPF_set_processor_pminfo, |
| 363 | .u.set_pminfo.id = -1, |
| 364 | .u.set_pminfo.type = XEN_PM_PDC, |
| 365 | }; |
| 366 | uint32_t buf[3]; |
| 367 | unsigned int ax, bx, cx, dx; |
| 368 | unsigned int mwait_mask; |
| 369 | |
| 370 | /* We need to determine whether it is OK to expose the MWAIT |
| 371 | * capability to the kernel to harvest deeper than C3 states from ACPI |
| 372 | * _CST using the processor_harvest_xen.c module. For this to work, we |
| 373 | * need to gather the MWAIT_LEAF values (which the cstate.c code |
| 374 | * checks against). The hypervisor won't expose the MWAIT flag because |
| 375 | * it would break backwards compatibility; so we will find out directly |
| 376 | * from the hardware and hypercall. |
| 377 | */ |
| 378 | if (!xen_initial_domain()) |
| 379 | return false; |
| 380 | |
Liu, Jinsong | e3aa4e6 | 2012-11-08 05:44:28 +0000 | [diff] [blame] | 381 | /* |
| 382 | * When running under platform earlier than Xen4.2, do not expose |
| 383 | * mwait, to avoid the risk of loading native acpi pad driver |
| 384 | */ |
| 385 | if (!xen_running_on_version_or_later(4, 2)) |
| 386 | return false; |
| 387 | |
Konrad Rzeszutek Wilk | 73c154c | 2012-02-13 22:26:32 -0500 | [diff] [blame] | 388 | ax = 1; |
| 389 | cx = 0; |
| 390 | |
| 391 | native_cpuid(&ax, &bx, &cx, &dx); |
| 392 | |
| 393 | mwait_mask = (1 << (X86_FEATURE_EST % 32)) | |
| 394 | (1 << (X86_FEATURE_MWAIT % 32)); |
| 395 | |
| 396 | if ((cx & mwait_mask) != mwait_mask) |
| 397 | return false; |
| 398 | |
| 399 | /* We need to emulate the MWAIT_LEAF and for that we need both |
| 400 | * ecx and edx. The hypercall provides only partial information. |
| 401 | */ |
| 402 | |
| 403 | ax = CPUID_MWAIT_LEAF; |
| 404 | bx = 0; |
| 405 | cx = 0; |
| 406 | dx = 0; |
| 407 | |
| 408 | native_cpuid(&ax, &bx, &cx, &dx); |
| 409 | |
| 410 | /* Ask the Hypervisor whether to clear ACPI_PDC_C_C2C3_FFH. If so, |
| 411 | * don't expose MWAIT_LEAF and let ACPI pick the IOPORT version of C3. |
| 412 | */ |
| 413 | buf[0] = ACPI_PDC_REVISION_ID; |
| 414 | buf[1] = 1; |
| 415 | buf[2] = (ACPI_PDC_C_CAPABILITY_SMP | ACPI_PDC_EST_CAPABILITY_SWSMP); |
| 416 | |
| 417 | set_xen_guest_handle(op.u.set_pminfo.pdc, buf); |
| 418 | |
Stefano Stabellini | cfafae9 | 2015-11-23 10:36:12 +0000 | [diff] [blame] | 419 | if ((HYPERVISOR_platform_op(&op) == 0) && |
Konrad Rzeszutek Wilk | 73c154c | 2012-02-13 22:26:32 -0500 | [diff] [blame] | 420 | (buf[2] & (ACPI_PDC_C_C1_FFH | ACPI_PDC_C_C2C3_FFH))) { |
| 421 | cpuid_leaf5_ecx_val = cx; |
| 422 | cpuid_leaf5_edx_val = dx; |
| 423 | } |
| 424 | return true; |
| 425 | #else |
| 426 | return false; |
| 427 | #endif |
| 428 | } |
Daniel Kiper | ad3062a | 2011-05-04 20:15:18 +0200 | [diff] [blame] | 429 | static void __init xen_init_cpuid_mask(void) |
Jeremy Fitzhardinge | e826fe1 | 2009-03-07 17:09:27 -0800 | [diff] [blame] | 430 | { |
| 431 | unsigned int ax, bx, cx, dx; |
Shan Haitao | 947ccf9 | 2010-11-09 11:43:36 -0800 | [diff] [blame] | 432 | unsigned int xsave_mask; |
Jeremy Fitzhardinge | e826fe1 | 2009-03-07 17:09:27 -0800 | [diff] [blame] | 433 | |
| 434 | cpuid_leaf1_edx_mask = |
Liu, Jinsong | cef12ee | 2012-06-07 19:56:51 +0800 | [diff] [blame] | 435 | ~((1 << X86_FEATURE_MTRR) | /* disable MTRR */ |
Jeremy Fitzhardinge | e826fe1 | 2009-03-07 17:09:27 -0800 | [diff] [blame] | 436 | (1 << X86_FEATURE_ACC)); /* thermal monitoring */ |
| 437 | |
| 438 | if (!xen_initial_domain()) |
| 439 | cpuid_leaf1_edx_mask &= |
Konrad Rzeszutek Wilk | 6efa20e | 2013-07-19 11:51:31 -0400 | [diff] [blame] | 440 | ~((1 << X86_FEATURE_ACPI)); /* disable ACPI */ |
Zhenzhong Duan | 4ea9b9a | 2013-03-29 09:14:00 +0800 | [diff] [blame] | 441 | |
| 442 | cpuid_leaf1_ecx_mask &= ~(1 << (X86_FEATURE_X2APIC % 32)); |
| 443 | |
Shan Haitao | 947ccf9 | 2010-11-09 11:43:36 -0800 | [diff] [blame] | 444 | ax = 1; |
Konrad Rzeszutek Wilk | 5e28783 | 2011-09-29 13:06:42 -0400 | [diff] [blame] | 445 | cx = 0; |
Mukesh Rathor | d285d68 | 2013-12-13 12:45:31 -0500 | [diff] [blame] | 446 | cpuid(1, &ax, &bx, &cx, &dx); |
Jeremy Fitzhardinge | e826fe1 | 2009-03-07 17:09:27 -0800 | [diff] [blame] | 447 | |
Shan Haitao | 947ccf9 | 2010-11-09 11:43:36 -0800 | [diff] [blame] | 448 | xsave_mask = |
| 449 | (1 << (X86_FEATURE_XSAVE % 32)) | |
| 450 | (1 << (X86_FEATURE_OSXSAVE % 32)); |
| 451 | |
| 452 | /* Xen will set CR4.OSXSAVE if supported and not disabled by force */ |
| 453 | if ((cx & xsave_mask) != xsave_mask) |
| 454 | cpuid_leaf1_ecx_mask &= ~xsave_mask; /* disable XSAVE & OSXSAVE */ |
Konrad Rzeszutek Wilk | 73c154c | 2012-02-13 22:26:32 -0500 | [diff] [blame] | 455 | if (xen_check_mwait()) |
| 456 | cpuid_leaf1_ecx_set_mask = (1 << (X86_FEATURE_MWAIT % 32)); |
Jeremy Fitzhardinge | e826fe1 | 2009-03-07 17:09:27 -0800 | [diff] [blame] | 457 | } |
| 458 | |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 459 | static void xen_set_debugreg(int reg, unsigned long val) |
| 460 | { |
| 461 | HYPERVISOR_set_debugreg(reg, val); |
| 462 | } |
| 463 | |
| 464 | static unsigned long xen_get_debugreg(int reg) |
| 465 | { |
| 466 | return HYPERVISOR_get_debugreg(reg); |
| 467 | } |
| 468 | |
Jeremy Fitzhardinge | 224101e | 2009-02-18 11:18:57 -0800 | [diff] [blame] | 469 | static void xen_end_context_switch(struct task_struct *next) |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 470 | { |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 471 | xen_mc_flush(); |
Jeremy Fitzhardinge | 224101e | 2009-02-18 11:18:57 -0800 | [diff] [blame] | 472 | paravirt_end_context_switch(next); |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 473 | } |
| 474 | |
| 475 | static unsigned long xen_store_tr(void) |
| 476 | { |
| 477 | return 0; |
| 478 | } |
| 479 | |
Jeremy Fitzhardinge | a05d2eb | 2008-07-27 08:45:02 -0700 | [diff] [blame] | 480 | /* |
Jeremy Fitzhardinge | cef43bf | 2008-07-28 13:33:44 -0700 | [diff] [blame] | 481 | * Set the page permissions for a particular virtual address. If the |
| 482 | * address is a vmalloc mapping (or other non-linear mapping), then |
| 483 | * find the linear mapping of the page and also set its protections to |
| 484 | * match. |
Jeremy Fitzhardinge | a05d2eb | 2008-07-27 08:45:02 -0700 | [diff] [blame] | 485 | */ |
| 486 | static void set_aliased_prot(void *v, pgprot_t prot) |
| 487 | { |
| 488 | int level; |
| 489 | pte_t *ptep; |
| 490 | pte_t pte; |
| 491 | unsigned long pfn; |
| 492 | struct page *page; |
Andy Lutomirski | aa1acff | 2015-07-30 14:31:31 -0700 | [diff] [blame] | 493 | unsigned char dummy; |
Jeremy Fitzhardinge | a05d2eb | 2008-07-27 08:45:02 -0700 | [diff] [blame] | 494 | |
| 495 | ptep = lookup_address((unsigned long)v, &level); |
| 496 | BUG_ON(ptep == NULL); |
| 497 | |
| 498 | pfn = pte_pfn(*ptep); |
| 499 | page = pfn_to_page(pfn); |
| 500 | |
| 501 | pte = pfn_pte(pfn, prot); |
| 502 | |
Andy Lutomirski | aa1acff | 2015-07-30 14:31:31 -0700 | [diff] [blame] | 503 | /* |
| 504 | * Careful: update_va_mapping() will fail if the virtual address |
| 505 | * we're poking isn't populated in the page tables. We don't |
| 506 | * need to worry about the direct map (that's always in the page |
| 507 | * tables), but we need to be careful about vmap space. In |
| 508 | * particular, the top level page table can lazily propagate |
| 509 | * entries between processes, so if we've switched mms since we |
| 510 | * vmapped the target in the first place, we might not have the |
| 511 | * top-level page table entry populated. |
| 512 | * |
| 513 | * We disable preemption because we want the same mm active when |
| 514 | * we probe the target and when we issue the hypercall. We'll |
| 515 | * have the same nominal mm, but if we're a kernel thread, lazy |
| 516 | * mm dropping could change our pgd. |
| 517 | * |
| 518 | * Out of an abundance of caution, this uses __get_user() to fault |
| 519 | * in the target address just in case there's some obscure case |
| 520 | * in which the target address isn't readable. |
| 521 | */ |
| 522 | |
| 523 | preempt_disable(); |
| 524 | |
| 525 | pagefault_disable(); /* Avoid warnings due to being atomic. */ |
| 526 | __get_user(dummy, (unsigned char __user __force *)v); |
| 527 | pagefault_enable(); |
| 528 | |
Jeremy Fitzhardinge | a05d2eb | 2008-07-27 08:45:02 -0700 | [diff] [blame] | 529 | if (HYPERVISOR_update_va_mapping((unsigned long)v, pte, 0)) |
| 530 | BUG(); |
| 531 | |
| 532 | if (!PageHighMem(page)) { |
| 533 | void *av = __va(PFN_PHYS(pfn)); |
| 534 | |
| 535 | if (av != v) |
| 536 | if (HYPERVISOR_update_va_mapping((unsigned long)av, pte, 0)) |
| 537 | BUG(); |
| 538 | } else |
| 539 | kmap_flush_unused(); |
Andy Lutomirski | aa1acff | 2015-07-30 14:31:31 -0700 | [diff] [blame] | 540 | |
| 541 | preempt_enable(); |
Jeremy Fitzhardinge | a05d2eb | 2008-07-27 08:45:02 -0700 | [diff] [blame] | 542 | } |
| 543 | |
Jeremy Fitzhardinge | 38ffbe6 | 2008-07-23 14:21:18 -0700 | [diff] [blame] | 544 | static void xen_alloc_ldt(struct desc_struct *ldt, unsigned entries) |
| 545 | { |
Jeremy Fitzhardinge | a05d2eb | 2008-07-27 08:45:02 -0700 | [diff] [blame] | 546 | const unsigned entries_per_page = PAGE_SIZE / LDT_ENTRY_SIZE; |
Jeremy Fitzhardinge | 38ffbe6 | 2008-07-23 14:21:18 -0700 | [diff] [blame] | 547 | int i; |
| 548 | |
Andy Lutomirski | aa1acff | 2015-07-30 14:31:31 -0700 | [diff] [blame] | 549 | /* |
| 550 | * We need to mark the all aliases of the LDT pages RO. We |
| 551 | * don't need to call vm_flush_aliases(), though, since that's |
| 552 | * only responsible for flushing aliases out the TLBs, not the |
| 553 | * page tables, and Xen will flush the TLB for us if needed. |
| 554 | * |
| 555 | * To avoid confusing future readers: none of this is necessary |
| 556 | * to load the LDT. The hypervisor only checks this when the |
| 557 | * LDT is faulted in due to subsequent descriptor access. |
| 558 | */ |
| 559 | |
Jeremy Fitzhardinge | a05d2eb | 2008-07-27 08:45:02 -0700 | [diff] [blame] | 560 | for(i = 0; i < entries; i += entries_per_page) |
| 561 | set_aliased_prot(ldt + i, PAGE_KERNEL_RO); |
Jeremy Fitzhardinge | 38ffbe6 | 2008-07-23 14:21:18 -0700 | [diff] [blame] | 562 | } |
| 563 | |
| 564 | static void xen_free_ldt(struct desc_struct *ldt, unsigned entries) |
| 565 | { |
Jeremy Fitzhardinge | a05d2eb | 2008-07-27 08:45:02 -0700 | [diff] [blame] | 566 | const unsigned entries_per_page = PAGE_SIZE / LDT_ENTRY_SIZE; |
Jeremy Fitzhardinge | 38ffbe6 | 2008-07-23 14:21:18 -0700 | [diff] [blame] | 567 | int i; |
| 568 | |
Jeremy Fitzhardinge | a05d2eb | 2008-07-27 08:45:02 -0700 | [diff] [blame] | 569 | for(i = 0; i < entries; i += entries_per_page) |
| 570 | set_aliased_prot(ldt + i, PAGE_KERNEL); |
Jeremy Fitzhardinge | 38ffbe6 | 2008-07-23 14:21:18 -0700 | [diff] [blame] | 571 | } |
| 572 | |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 573 | static void xen_set_ldt(const void *addr, unsigned entries) |
| 574 | { |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 575 | struct mmuext_op *op; |
| 576 | struct multicall_space mcs = xen_mc_entry(sizeof(*op)); |
| 577 | |
Jeremy Fitzhardinge | ab78f7a | 2010-12-17 15:54:28 -0800 | [diff] [blame] | 578 | trace_xen_cpu_set_ldt(addr, entries); |
| 579 | |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 580 | op = mcs.args; |
| 581 | op->cmd = MMUEXT_SET_LDT; |
Jan Beulich | 4dbf7af | 2008-01-30 13:33:14 +0100 | [diff] [blame] | 582 | op->arg1.linear_addr = (unsigned long)addr; |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 583 | op->arg2.nr_ents = entries; |
| 584 | |
| 585 | MULTI_mmuext_op(mcs.mc, op, 1, NULL, DOMID_SELF); |
| 586 | |
| 587 | xen_mc_issue(PARAVIRT_LAZY_CPU); |
| 588 | } |
| 589 | |
Glauber de Oliveira Costa | 6b68f01 | 2008-01-30 13:31:12 +0100 | [diff] [blame] | 590 | static void xen_load_gdt(const struct desc_ptr *dtr) |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 591 | { |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 592 | unsigned long va = dtr->address; |
| 593 | unsigned int size = dtr->size + 1; |
| 594 | unsigned pages = (size + PAGE_SIZE - 1) / PAGE_SIZE; |
Jeremy Fitzhardinge | 3ce5fa7 | 2009-03-04 15:26:00 -0800 | [diff] [blame] | 595 | unsigned long frames[pages]; |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 596 | int f; |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 597 | |
Jeremy Fitzhardinge | 577eebe | 2009-08-27 12:46:35 -0700 | [diff] [blame] | 598 | /* |
| 599 | * A GDT can be up to 64k in size, which corresponds to 8192 |
| 600 | * 8-byte entries, or 16 4k pages.. |
| 601 | */ |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 602 | |
| 603 | BUG_ON(size > 65536); |
| 604 | BUG_ON(va & ~PAGE_MASK); |
| 605 | |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 606 | for (f = 0; va < dtr->address + size; va += PAGE_SIZE, f++) { |
Jeremy Fitzhardinge | 6ed6bf42 | 2009-03-04 13:02:18 -0800 | [diff] [blame] | 607 | int level; |
Jeremy Fitzhardinge | 577eebe | 2009-08-27 12:46:35 -0700 | [diff] [blame] | 608 | pte_t *ptep; |
Jeremy Fitzhardinge | 6ed6bf42 | 2009-03-04 13:02:18 -0800 | [diff] [blame] | 609 | unsigned long pfn, mfn; |
| 610 | void *virt; |
| 611 | |
Jeremy Fitzhardinge | 577eebe | 2009-08-27 12:46:35 -0700 | [diff] [blame] | 612 | /* |
| 613 | * The GDT is per-cpu and is in the percpu data area. |
| 614 | * That can be virtually mapped, so we need to do a |
| 615 | * page-walk to get the underlying MFN for the |
| 616 | * hypercall. The page can also be in the kernel's |
| 617 | * linear range, so we need to RO that mapping too. |
| 618 | */ |
| 619 | ptep = lookup_address(va, &level); |
Jeremy Fitzhardinge | 6ed6bf42 | 2009-03-04 13:02:18 -0800 | [diff] [blame] | 620 | BUG_ON(ptep == NULL); |
| 621 | |
| 622 | pfn = pte_pfn(*ptep); |
| 623 | mfn = pfn_to_mfn(pfn); |
| 624 | virt = __va(PFN_PHYS(pfn)); |
| 625 | |
| 626 | frames[f] = mfn; |
Jeremy Fitzhardinge | 9976b39 | 2009-02-27 09:19:26 -0800 | [diff] [blame] | 627 | |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 628 | make_lowmem_page_readonly((void *)va); |
Jeremy Fitzhardinge | 6ed6bf42 | 2009-03-04 13:02:18 -0800 | [diff] [blame] | 629 | make_lowmem_page_readonly(virt); |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 630 | } |
| 631 | |
Jeremy Fitzhardinge | 3ce5fa7 | 2009-03-04 15:26:00 -0800 | [diff] [blame] | 632 | if (HYPERVISOR_set_gdt(frames, size / sizeof(struct desc_struct))) |
| 633 | BUG(); |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 634 | } |
| 635 | |
Jeremy Fitzhardinge | 577eebe | 2009-08-27 12:46:35 -0700 | [diff] [blame] | 636 | /* |
| 637 | * load_gdt for early boot, when the gdt is only mapped once |
| 638 | */ |
Daniel Kiper | ad3062a | 2011-05-04 20:15:18 +0200 | [diff] [blame] | 639 | static void __init xen_load_gdt_boot(const struct desc_ptr *dtr) |
Jeremy Fitzhardinge | 577eebe | 2009-08-27 12:46:35 -0700 | [diff] [blame] | 640 | { |
| 641 | unsigned long va = dtr->address; |
| 642 | unsigned int size = dtr->size + 1; |
| 643 | unsigned pages = (size + PAGE_SIZE - 1) / PAGE_SIZE; |
| 644 | unsigned long frames[pages]; |
| 645 | int f; |
| 646 | |
| 647 | /* |
| 648 | * A GDT can be up to 64k in size, which corresponds to 8192 |
| 649 | * 8-byte entries, or 16 4k pages.. |
| 650 | */ |
| 651 | |
| 652 | BUG_ON(size > 65536); |
| 653 | BUG_ON(va & ~PAGE_MASK); |
| 654 | |
| 655 | for (f = 0; va < dtr->address + size; va += PAGE_SIZE, f++) { |
| 656 | pte_t pte; |
| 657 | unsigned long pfn, mfn; |
| 658 | |
| 659 | pfn = virt_to_pfn(va); |
| 660 | mfn = pfn_to_mfn(pfn); |
| 661 | |
| 662 | pte = pfn_pte(pfn, PAGE_KERNEL_RO); |
| 663 | |
| 664 | if (HYPERVISOR_update_va_mapping((unsigned long)va, pte, 0)) |
| 665 | BUG(); |
| 666 | |
| 667 | frames[f] = mfn; |
| 668 | } |
| 669 | |
| 670 | if (HYPERVISOR_set_gdt(frames, size / sizeof(struct desc_struct))) |
| 671 | BUG(); |
| 672 | } |
| 673 | |
David Vrabel | 5929036 | 2012-07-09 11:39:07 +0100 | [diff] [blame] | 674 | static inline bool desc_equal(const struct desc_struct *d1, |
| 675 | const struct desc_struct *d2) |
| 676 | { |
| 677 | return d1->a == d2->a && d1->b == d2->b; |
| 678 | } |
| 679 | |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 680 | static void load_TLS_descriptor(struct thread_struct *t, |
| 681 | unsigned int cpu, unsigned int i) |
| 682 | { |
David Vrabel | 1c32cdc | 2012-07-09 11:39:08 +0100 | [diff] [blame] | 683 | struct desc_struct *shadow = &per_cpu(shadow_tls_desc, cpu).desc[i]; |
| 684 | struct desc_struct *gdt; |
| 685 | xmaddr_t maddr; |
| 686 | struct multicall_space mc; |
| 687 | |
| 688 | if (desc_equal(shadow, &t->tls_array[i])) |
| 689 | return; |
| 690 | |
| 691 | *shadow = t->tls_array[i]; |
| 692 | |
| 693 | gdt = get_cpu_gdt_table(cpu); |
| 694 | maddr = arbitrary_virt_to_machine(&gdt[GDT_ENTRY_TLS_MIN+i]); |
| 695 | mc = __xen_mc_entry(0); |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 696 | |
| 697 | MULTI_update_descriptor(mc.mc, maddr.maddr, t->tls_array[i]); |
| 698 | } |
| 699 | |
| 700 | static void xen_load_tls(struct thread_struct *t, unsigned int cpu) |
| 701 | { |
Jeremy Fitzhardinge | 8b84ad9 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 702 | /* |
Tejun Heo | ccbeed3 | 2009-02-09 22:17:40 +0900 | [diff] [blame] | 703 | * XXX sleazy hack: If we're being called in a lazy-cpu zone |
| 704 | * and lazy gs handling is enabled, it means we're in a |
| 705 | * context switch, and %gs has just been saved. This means we |
| 706 | * can zero it out to prevent faults on exit from the |
| 707 | * hypervisor if the next process has no %gs. Either way, it |
| 708 | * has been saved, and the new value will get loaded properly. |
| 709 | * This will go away as soon as Xen has been modified to not |
| 710 | * save/restore %gs for normal hypercalls. |
Eduardo Habkost | 8a95408 | 2008-07-08 15:07:10 -0700 | [diff] [blame] | 711 | * |
| 712 | * On x86_64, this hack is not used for %gs, because gs points |
| 713 | * to KERNEL_GS_BASE (and uses it for PDA references), so we |
| 714 | * must not zero %gs on x86_64 |
| 715 | * |
| 716 | * For x86_64, we need to zero %fs, otherwise we may get an |
| 717 | * exception between the new %fs descriptor being loaded and |
| 718 | * %fs being effectively cleared at __switch_to(). |
Jeremy Fitzhardinge | 8b84ad9 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 719 | */ |
Eduardo Habkost | 8a95408 | 2008-07-08 15:07:10 -0700 | [diff] [blame] | 720 | if (paravirt_get_lazy_mode() == PARAVIRT_LAZY_CPU) { |
| 721 | #ifdef CONFIG_X86_32 |
Tejun Heo | ccbeed3 | 2009-02-09 22:17:40 +0900 | [diff] [blame] | 722 | lazy_load_gs(0); |
Eduardo Habkost | 8a95408 | 2008-07-08 15:07:10 -0700 | [diff] [blame] | 723 | #else |
| 724 | loadsegment(fs, 0); |
| 725 | #endif |
| 726 | } |
| 727 | |
| 728 | xen_mc_batch(); |
| 729 | |
| 730 | load_TLS_descriptor(t, cpu, 0); |
| 731 | load_TLS_descriptor(t, cpu, 1); |
| 732 | load_TLS_descriptor(t, cpu, 2); |
| 733 | |
| 734 | xen_mc_issue(PARAVIRT_LAZY_CPU); |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 735 | } |
| 736 | |
Eduardo Habkost | a8fc108 | 2008-07-08 15:07:05 -0700 | [diff] [blame] | 737 | #ifdef CONFIG_X86_64 |
| 738 | static void xen_load_gs_index(unsigned int idx) |
| 739 | { |
| 740 | if (HYPERVISOR_set_segment_base(SEGBASE_GS_USER_SEL, idx)) |
| 741 | BUG(); |
| 742 | } |
| 743 | #endif |
| 744 | |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 745 | static void xen_write_ldt_entry(struct desc_struct *dt, int entrynum, |
Glauber de Oliveira Costa | 75b8bb3 | 2008-01-30 13:31:13 +0100 | [diff] [blame] | 746 | const void *ptr) |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 747 | { |
Jeremy Fitzhardinge | cef43bf | 2008-07-28 13:33:44 -0700 | [diff] [blame] | 748 | xmaddr_t mach_lp = arbitrary_virt_to_machine(&dt[entrynum]); |
Glauber de Oliveira Costa | 75b8bb3 | 2008-01-30 13:31:13 +0100 | [diff] [blame] | 749 | u64 entry = *(u64 *)ptr; |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 750 | |
Jeremy Fitzhardinge | ab78f7a | 2010-12-17 15:54:28 -0800 | [diff] [blame] | 751 | trace_xen_cpu_write_ldt_entry(dt, entrynum, entry); |
| 752 | |
Jeremy Fitzhardinge | f120f13 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 753 | preempt_disable(); |
| 754 | |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 755 | xen_mc_flush(); |
| 756 | if (HYPERVISOR_update_descriptor(mach_lp.maddr, entry)) |
| 757 | BUG(); |
Jeremy Fitzhardinge | f120f13 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 758 | |
| 759 | preempt_enable(); |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 760 | } |
| 761 | |
Eduardo Habkost | e176d36 | 2008-07-08 15:06:59 -0700 | [diff] [blame] | 762 | static int cvt_gate_to_trap(int vector, const gate_desc *val, |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 763 | struct trap_info *info) |
| 764 | { |
Jeremy Fitzhardinge | 6cac5a9 | 2009-03-29 19:56:29 -0700 | [diff] [blame] | 765 | unsigned long addr; |
| 766 | |
Jeremy Fitzhardinge | 6d02c42 | 2009-03-29 22:57:15 -0700 | [diff] [blame] | 767 | if (val->type != GATE_TRAP && val->type != GATE_INTERRUPT) |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 768 | return 0; |
| 769 | |
| 770 | info->vector = vector; |
Jeremy Fitzhardinge | 6cac5a9 | 2009-03-29 19:56:29 -0700 | [diff] [blame] | 771 | |
| 772 | addr = gate_offset(*val); |
| 773 | #ifdef CONFIG_X86_64 |
Jeremy Fitzhardinge | b80119b | 2009-04-24 00:22:08 -0700 | [diff] [blame] | 774 | /* |
| 775 | * Look for known traps using IST, and substitute them |
| 776 | * appropriately. The debugger ones are the only ones we care |
Liu, Jinsong | 05e3600 | 2012-06-07 20:10:37 +0800 | [diff] [blame] | 777 | * about. Xen will handle faults like double_fault, |
| 778 | * so we should never see them. Warn if |
Jeremy Fitzhardinge | b80119b | 2009-04-24 00:22:08 -0700 | [diff] [blame] | 779 | * there's an unexpected IST-using fault handler. |
| 780 | */ |
Jeremy Fitzhardinge | 6cac5a9 | 2009-03-29 19:56:29 -0700 | [diff] [blame] | 781 | if (addr == (unsigned long)debug) |
| 782 | addr = (unsigned long)xen_debug; |
| 783 | else if (addr == (unsigned long)int3) |
| 784 | addr = (unsigned long)xen_int3; |
| 785 | else if (addr == (unsigned long)stack_segment) |
| 786 | addr = (unsigned long)xen_stack_segment; |
Konrad Rzeszutek Wilk | 6efa20e | 2013-07-19 11:51:31 -0400 | [diff] [blame] | 787 | else if (addr == (unsigned long)double_fault) { |
Jeremy Fitzhardinge | b80119b | 2009-04-24 00:22:08 -0700 | [diff] [blame] | 788 | /* Don't need to handle these */ |
| 789 | return 0; |
| 790 | #ifdef CONFIG_X86_MCE |
| 791 | } else if (addr == (unsigned long)machine_check) { |
Liu, Jinsong | 05e3600 | 2012-06-07 20:10:37 +0800 | [diff] [blame] | 792 | /* |
| 793 | * when xen hypervisor inject vMCE to guest, |
| 794 | * use native mce handler to handle it |
| 795 | */ |
| 796 | ; |
Jeremy Fitzhardinge | b80119b | 2009-04-24 00:22:08 -0700 | [diff] [blame] | 797 | #endif |
Konrad Rzeszutek Wilk | 6efa20e | 2013-07-19 11:51:31 -0400 | [diff] [blame] | 798 | } else if (addr == (unsigned long)nmi) |
| 799 | /* |
| 800 | * Use the native version as well. |
| 801 | */ |
| 802 | ; |
| 803 | else { |
Jeremy Fitzhardinge | b80119b | 2009-04-24 00:22:08 -0700 | [diff] [blame] | 804 | /* Some other trap using IST? */ |
| 805 | if (WARN_ON(val->ist != 0)) |
| 806 | return 0; |
| 807 | } |
Jeremy Fitzhardinge | 6cac5a9 | 2009-03-29 19:56:29 -0700 | [diff] [blame] | 808 | #endif /* CONFIG_X86_64 */ |
| 809 | info->address = addr; |
| 810 | |
Eduardo Habkost | e176d36 | 2008-07-08 15:06:59 -0700 | [diff] [blame] | 811 | info->cs = gate_segment(*val); |
| 812 | info->flags = val->dpl; |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 813 | /* interrupt gates clear IF */ |
Jeremy Fitzhardinge | 6d02c42 | 2009-03-29 22:57:15 -0700 | [diff] [blame] | 814 | if (val->type == GATE_INTERRUPT) |
| 815 | info->flags |= 1 << 2; |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 816 | |
| 817 | return 1; |
| 818 | } |
| 819 | |
| 820 | /* Locations of each CPU's IDT */ |
Glauber de Oliveira Costa | 6b68f01 | 2008-01-30 13:31:12 +0100 | [diff] [blame] | 821 | static DEFINE_PER_CPU(struct desc_ptr, idt_desc); |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 822 | |
| 823 | /* Set an IDT entry. If the entry is part of the current IDT, then |
| 824 | also update Xen. */ |
Glauber de Oliveira Costa | 8d94734 | 2008-01-30 13:31:12 +0100 | [diff] [blame] | 825 | static void xen_write_idt_entry(gate_desc *dt, int entrynum, const gate_desc *g) |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 826 | { |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 827 | unsigned long p = (unsigned long)&dt[entrynum]; |
Jeremy Fitzhardinge | f120f13 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 828 | unsigned long start, end; |
| 829 | |
Jeremy Fitzhardinge | ab78f7a | 2010-12-17 15:54:28 -0800 | [diff] [blame] | 830 | trace_xen_cpu_write_idt_entry(dt, entrynum, g); |
| 831 | |
Jeremy Fitzhardinge | f120f13 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 832 | preempt_disable(); |
| 833 | |
Christoph Lameter | 780f36d | 2010-12-06 11:16:29 -0600 | [diff] [blame] | 834 | start = __this_cpu_read(idt_desc.address); |
| 835 | end = start + __this_cpu_read(idt_desc.size) + 1; |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 836 | |
| 837 | xen_mc_flush(); |
| 838 | |
Glauber de Oliveira Costa | 8d94734 | 2008-01-30 13:31:12 +0100 | [diff] [blame] | 839 | native_write_idt_entry(dt, entrynum, g); |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 840 | |
| 841 | if (p >= start && (p + 8) <= end) { |
| 842 | struct trap_info info[2]; |
| 843 | |
| 844 | info[1].address = 0; |
| 845 | |
Eduardo Habkost | e176d36 | 2008-07-08 15:06:59 -0700 | [diff] [blame] | 846 | if (cvt_gate_to_trap(entrynum, g, &info[0])) |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 847 | if (HYPERVISOR_set_trap_table(info)) |
| 848 | BUG(); |
| 849 | } |
Jeremy Fitzhardinge | f120f13 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 850 | |
| 851 | preempt_enable(); |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 852 | } |
| 853 | |
Glauber de Oliveira Costa | 6b68f01 | 2008-01-30 13:31:12 +0100 | [diff] [blame] | 854 | static void xen_convert_trap_info(const struct desc_ptr *desc, |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 855 | struct trap_info *traps) |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 856 | { |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 857 | unsigned in, out, count; |
| 858 | |
Eduardo Habkost | e176d36 | 2008-07-08 15:06:59 -0700 | [diff] [blame] | 859 | count = (desc->size+1) / sizeof(gate_desc); |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 860 | BUG_ON(count > 256); |
| 861 | |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 862 | for (in = out = 0; in < count; in++) { |
Eduardo Habkost | e176d36 | 2008-07-08 15:06:59 -0700 | [diff] [blame] | 863 | gate_desc *entry = (gate_desc*)(desc->address) + in; |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 864 | |
Eduardo Habkost | e176d36 | 2008-07-08 15:06:59 -0700 | [diff] [blame] | 865 | if (cvt_gate_to_trap(in, entry, &traps[out])) |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 866 | out++; |
| 867 | } |
| 868 | traps[out].address = 0; |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 869 | } |
| 870 | |
| 871 | void xen_copy_trap_info(struct trap_info *traps) |
| 872 | { |
Christoph Lameter | 89cbc76 | 2014-08-17 12:30:40 -0500 | [diff] [blame] | 873 | const struct desc_ptr *desc = this_cpu_ptr(&idt_desc); |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 874 | |
| 875 | xen_convert_trap_info(desc, traps); |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 876 | } |
| 877 | |
| 878 | /* Load a new IDT into Xen. In principle this can be per-CPU, so we |
| 879 | hold a spinlock to protect the static traps[] array (static because |
| 880 | it avoids allocation, and saves stack space). */ |
Glauber de Oliveira Costa | 6b68f01 | 2008-01-30 13:31:12 +0100 | [diff] [blame] | 881 | static void xen_load_idt(const struct desc_ptr *desc) |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 882 | { |
| 883 | static DEFINE_SPINLOCK(lock); |
| 884 | static struct trap_info traps[257]; |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 885 | |
Jeremy Fitzhardinge | ab78f7a | 2010-12-17 15:54:28 -0800 | [diff] [blame] | 886 | trace_xen_cpu_load_idt(desc); |
| 887 | |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 888 | spin_lock(&lock); |
| 889 | |
Christoph Lameter | 89cbc76 | 2014-08-17 12:30:40 -0500 | [diff] [blame] | 890 | memcpy(this_cpu_ptr(&idt_desc), desc, sizeof(idt_desc)); |
Jeremy Fitzhardinge | f120f13 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 891 | |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 892 | xen_convert_trap_info(desc, traps); |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 893 | |
| 894 | xen_mc_flush(); |
| 895 | if (HYPERVISOR_set_trap_table(traps)) |
| 896 | BUG(); |
| 897 | |
| 898 | spin_unlock(&lock); |
| 899 | } |
| 900 | |
| 901 | /* Write a GDT descriptor entry. Ignore LDT descriptors, since |
| 902 | they're handled differently. */ |
| 903 | static void xen_write_gdt_entry(struct desc_struct *dt, int entry, |
Glauber de Oliveira Costa | 014b15b | 2008-01-30 13:31:13 +0100 | [diff] [blame] | 904 | const void *desc, int type) |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 905 | { |
Jeremy Fitzhardinge | ab78f7a | 2010-12-17 15:54:28 -0800 | [diff] [blame] | 906 | trace_xen_cpu_write_gdt_entry(dt, entry, desc, type); |
| 907 | |
Jeremy Fitzhardinge | f120f13 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 908 | preempt_disable(); |
| 909 | |
Glauber de Oliveira Costa | 014b15b | 2008-01-30 13:31:13 +0100 | [diff] [blame] | 910 | switch (type) { |
| 911 | case DESC_LDT: |
| 912 | case DESC_TSS: |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 913 | /* ignore */ |
| 914 | break; |
| 915 | |
| 916 | default: { |
Jeremy Fitzhardinge | 9976b39 | 2009-02-27 09:19:26 -0800 | [diff] [blame] | 917 | xmaddr_t maddr = arbitrary_virt_to_machine(&dt[entry]); |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 918 | |
| 919 | xen_mc_flush(); |
Glauber de Oliveira Costa | 014b15b | 2008-01-30 13:31:13 +0100 | [diff] [blame] | 920 | if (HYPERVISOR_update_descriptor(maddr.maddr, *(u64 *)desc)) |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 921 | BUG(); |
| 922 | } |
| 923 | |
| 924 | } |
Jeremy Fitzhardinge | f120f13 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 925 | |
| 926 | preempt_enable(); |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 927 | } |
| 928 | |
Jeremy Fitzhardinge | 577eebe | 2009-08-27 12:46:35 -0700 | [diff] [blame] | 929 | /* |
| 930 | * Version of write_gdt_entry for use at early boot-time needed to |
| 931 | * update an entry as simply as possible. |
| 932 | */ |
Daniel Kiper | ad3062a | 2011-05-04 20:15:18 +0200 | [diff] [blame] | 933 | static void __init xen_write_gdt_entry_boot(struct desc_struct *dt, int entry, |
Jeremy Fitzhardinge | 577eebe | 2009-08-27 12:46:35 -0700 | [diff] [blame] | 934 | const void *desc, int type) |
| 935 | { |
Jeremy Fitzhardinge | ab78f7a | 2010-12-17 15:54:28 -0800 | [diff] [blame] | 936 | trace_xen_cpu_write_gdt_entry(dt, entry, desc, type); |
| 937 | |
Jeremy Fitzhardinge | 577eebe | 2009-08-27 12:46:35 -0700 | [diff] [blame] | 938 | switch (type) { |
| 939 | case DESC_LDT: |
| 940 | case DESC_TSS: |
| 941 | /* ignore */ |
| 942 | break; |
| 943 | |
| 944 | default: { |
| 945 | xmaddr_t maddr = virt_to_machine(&dt[entry]); |
| 946 | |
| 947 | if (HYPERVISOR_update_descriptor(maddr.maddr, *(u64 *)desc)) |
| 948 | dt[entry] = *(struct desc_struct *)desc; |
| 949 | } |
| 950 | |
| 951 | } |
| 952 | } |
| 953 | |
H. Peter Anvin | faca622 | 2008-01-30 13:31:02 +0100 | [diff] [blame] | 954 | static void xen_load_sp0(struct tss_struct *tss, |
Jeremy Fitzhardinge | a05d2eb | 2008-07-27 08:45:02 -0700 | [diff] [blame] | 955 | struct thread_struct *thread) |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 956 | { |
Jeremy Fitzhardinge | ab78f7a | 2010-12-17 15:54:28 -0800 | [diff] [blame] | 957 | struct multicall_space mcs; |
| 958 | |
| 959 | mcs = xen_mc_entry(0); |
H. Peter Anvin | faca622 | 2008-01-30 13:31:02 +0100 | [diff] [blame] | 960 | MULTI_stack_switch(mcs.mc, __KERNEL_DS, thread->sp0); |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 961 | xen_mc_issue(PARAVIRT_LAZY_CPU); |
Andy Lutomirski | 8ef46a6 | 2015-03-05 19:19:02 -0800 | [diff] [blame] | 962 | tss->x86_tss.sp0 = thread->sp0; |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 963 | } |
| 964 | |
Andy Lutomirski | b7a58459 | 2016-03-16 14:14:21 -0700 | [diff] [blame] | 965 | void xen_set_iopl_mask(unsigned mask) |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 966 | { |
| 967 | struct physdev_set_iopl set_iopl; |
| 968 | |
| 969 | /* Force the change at ring 0. */ |
| 970 | set_iopl.iopl = (mask == 0) ? 1 : (mask >> 12) & 3; |
| 971 | HYPERVISOR_physdev_op(PHYSDEVOP_set_iopl, &set_iopl); |
| 972 | } |
| 973 | |
| 974 | static void xen_io_delay(void) |
| 975 | { |
| 976 | } |
| 977 | |
Jeremy Fitzhardinge | 7b1333a | 2008-05-26 23:31:01 +0100 | [diff] [blame] | 978 | static void xen_clts(void) |
| 979 | { |
| 980 | struct multicall_space mcs; |
| 981 | |
| 982 | mcs = xen_mc_entry(0); |
| 983 | |
| 984 | MULTI_fpu_taskswitch(mcs.mc, 0); |
| 985 | |
| 986 | xen_mc_issue(PARAVIRT_LAZY_CPU); |
| 987 | } |
| 988 | |
Jeremy Fitzhardinge | a789ed5 | 2009-04-24 00:26:50 -0700 | [diff] [blame] | 989 | static DEFINE_PER_CPU(unsigned long, xen_cr0_value); |
| 990 | |
| 991 | static unsigned long xen_read_cr0(void) |
| 992 | { |
Alex Shi | 2113f46 | 2012-01-13 23:53:35 +0800 | [diff] [blame] | 993 | unsigned long cr0 = this_cpu_read(xen_cr0_value); |
Jeremy Fitzhardinge | a789ed5 | 2009-04-24 00:26:50 -0700 | [diff] [blame] | 994 | |
| 995 | if (unlikely(cr0 == 0)) { |
| 996 | cr0 = native_read_cr0(); |
Alex Shi | 2113f46 | 2012-01-13 23:53:35 +0800 | [diff] [blame] | 997 | this_cpu_write(xen_cr0_value, cr0); |
Jeremy Fitzhardinge | a789ed5 | 2009-04-24 00:26:50 -0700 | [diff] [blame] | 998 | } |
| 999 | |
| 1000 | return cr0; |
| 1001 | } |
| 1002 | |
Jeremy Fitzhardinge | 7b1333a | 2008-05-26 23:31:01 +0100 | [diff] [blame] | 1003 | static void xen_write_cr0(unsigned long cr0) |
| 1004 | { |
| 1005 | struct multicall_space mcs; |
| 1006 | |
Alex Shi | 2113f46 | 2012-01-13 23:53:35 +0800 | [diff] [blame] | 1007 | this_cpu_write(xen_cr0_value, cr0); |
Jeremy Fitzhardinge | a789ed5 | 2009-04-24 00:26:50 -0700 | [diff] [blame] | 1008 | |
Jeremy Fitzhardinge | 7b1333a | 2008-05-26 23:31:01 +0100 | [diff] [blame] | 1009 | /* Only pay attention to cr0.TS; everything else is |
| 1010 | ignored. */ |
| 1011 | mcs = xen_mc_entry(0); |
| 1012 | |
| 1013 | MULTI_fpu_taskswitch(mcs.mc, (cr0 & X86_CR0_TS) != 0); |
| 1014 | |
| 1015 | xen_mc_issue(PARAVIRT_LAZY_CPU); |
| 1016 | } |
| 1017 | |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 1018 | static void xen_write_cr4(unsigned long cr4) |
| 1019 | { |
Boris Ostrovsky | 3375d82 | 2015-08-10 16:34:38 -0400 | [diff] [blame] | 1020 | cr4 &= ~(X86_CR4_PGE | X86_CR4_PSE | X86_CR4_PCE); |
Jeremy Fitzhardinge | 2956a35 | 2008-05-26 23:31:04 +0100 | [diff] [blame] | 1021 | |
| 1022 | native_write_cr4(cr4); |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 1023 | } |
Konrad Rzeszutek Wilk | 1a7bbda | 2012-10-10 13:25:48 -0400 | [diff] [blame] | 1024 | #ifdef CONFIG_X86_64 |
| 1025 | static inline unsigned long xen_read_cr8(void) |
| 1026 | { |
| 1027 | return 0; |
| 1028 | } |
| 1029 | static inline void xen_write_cr8(unsigned long val) |
| 1030 | { |
| 1031 | BUG_ON(val); |
| 1032 | } |
| 1033 | #endif |
Boris Ostrovsky | 31795b47 | 2015-02-11 14:39:18 -0500 | [diff] [blame] | 1034 | |
| 1035 | static u64 xen_read_msr_safe(unsigned int msr, int *err) |
| 1036 | { |
| 1037 | u64 val; |
| 1038 | |
Boris Ostrovsky | 6b08cd6 | 2015-08-10 16:34:36 -0400 | [diff] [blame] | 1039 | if (pmu_msr_read(msr, &val, err)) |
| 1040 | return val; |
| 1041 | |
Boris Ostrovsky | 31795b47 | 2015-02-11 14:39:18 -0500 | [diff] [blame] | 1042 | val = native_read_msr_safe(msr, err); |
| 1043 | switch (msr) { |
| 1044 | case MSR_IA32_APICBASE: |
| 1045 | #ifdef CONFIG_X86_X2APIC |
| 1046 | if (!(cpuid_ecx(1) & (1 << (X86_FEATURE_X2APIC & 31)))) |
| 1047 | #endif |
| 1048 | val &= ~X2APIC_ENABLE; |
| 1049 | break; |
| 1050 | } |
| 1051 | return val; |
| 1052 | } |
| 1053 | |
Jeremy Fitzhardinge | 1153968 | 2008-07-08 15:07:16 -0700 | [diff] [blame] | 1054 | static int xen_write_msr_safe(unsigned int msr, unsigned low, unsigned high) |
| 1055 | { |
| 1056 | int ret; |
| 1057 | |
| 1058 | ret = 0; |
| 1059 | |
Tej | f63c2f2 | 2008-12-16 11:56:06 -0800 | [diff] [blame] | 1060 | switch (msr) { |
Jeremy Fitzhardinge | 1153968 | 2008-07-08 15:07:16 -0700 | [diff] [blame] | 1061 | #ifdef CONFIG_X86_64 |
| 1062 | unsigned which; |
| 1063 | u64 base; |
| 1064 | |
| 1065 | case MSR_FS_BASE: which = SEGBASE_FS; goto set; |
| 1066 | case MSR_KERNEL_GS_BASE: which = SEGBASE_GS_USER; goto set; |
| 1067 | case MSR_GS_BASE: which = SEGBASE_GS_KERNEL; goto set; |
| 1068 | |
| 1069 | set: |
| 1070 | base = ((u64)high << 32) | low; |
| 1071 | if (HYPERVISOR_set_segment_base(which, base) != 0) |
H. Peter Anvin | 0cc0213 | 2009-08-31 14:23:29 -0700 | [diff] [blame] | 1072 | ret = -EIO; |
Jeremy Fitzhardinge | 1153968 | 2008-07-08 15:07:16 -0700 | [diff] [blame] | 1073 | break; |
| 1074 | #endif |
Jeremy Fitzhardinge | d89961e | 2008-07-24 13:48:58 -0700 | [diff] [blame] | 1075 | |
| 1076 | case MSR_STAR: |
| 1077 | case MSR_CSTAR: |
| 1078 | case MSR_LSTAR: |
| 1079 | case MSR_SYSCALL_MASK: |
| 1080 | case MSR_IA32_SYSENTER_CS: |
| 1081 | case MSR_IA32_SYSENTER_ESP: |
| 1082 | case MSR_IA32_SYSENTER_EIP: |
| 1083 | /* Fast syscall setup is all done in hypercalls, so |
| 1084 | these are all ignored. Stub them out here to stop |
| 1085 | Xen console noise. */ |
Boris Ostrovsky | 2ecf91b | 2015-09-21 09:09:28 -0400 | [diff] [blame] | 1086 | break; |
Jeremy Fitzhardinge | 41f2e47 | 2010-03-30 11:47:40 -0700 | [diff] [blame] | 1087 | |
Jeremy Fitzhardinge | 1153968 | 2008-07-08 15:07:16 -0700 | [diff] [blame] | 1088 | default: |
Boris Ostrovsky | 6b08cd6 | 2015-08-10 16:34:36 -0400 | [diff] [blame] | 1089 | if (!pmu_msr_write(msr, low, high, &ret)) |
| 1090 | ret = native_write_msr_safe(msr, low, high); |
Jeremy Fitzhardinge | 1153968 | 2008-07-08 15:07:16 -0700 | [diff] [blame] | 1091 | } |
| 1092 | |
| 1093 | return ret; |
| 1094 | } |
| 1095 | |
Jeremy Fitzhardinge | 0e91398 | 2008-05-26 23:31:27 +0100 | [diff] [blame] | 1096 | void xen_setup_shared_info(void) |
Jeremy Fitzhardinge | 2e8fe71 | 2008-03-17 16:36:53 -0700 | [diff] [blame] | 1097 | { |
| 1098 | if (!xen_feature(XENFEAT_auto_translated_physmap)) { |
Jeremy Fitzhardinge | 15664f9 | 2008-07-08 15:06:47 -0700 | [diff] [blame] | 1099 | set_fixmap(FIX_PARAVIRT_BOOTMAP, |
| 1100 | xen_start_info->shared_info); |
Jeremy Fitzhardinge | 2e8fe71 | 2008-03-17 16:36:53 -0700 | [diff] [blame] | 1101 | |
Jeremy Fitzhardinge | 15664f9 | 2008-07-08 15:06:47 -0700 | [diff] [blame] | 1102 | HYPERVISOR_shared_info = |
| 1103 | (struct shared_info *)fix_to_virt(FIX_PARAVIRT_BOOTMAP); |
Jeremy Fitzhardinge | 2e8fe71 | 2008-03-17 16:36:53 -0700 | [diff] [blame] | 1104 | } else |
| 1105 | HYPERVISOR_shared_info = |
| 1106 | (struct shared_info *)__va(xen_start_info->shared_info); |
| 1107 | |
| 1108 | #ifndef CONFIG_SMP |
| 1109 | /* In UP this is as good a place as any to set up shared info */ |
| 1110 | xen_setup_vcpu_info_placement(); |
| 1111 | #endif |
Jeremy Fitzhardinge | d5edbc1 | 2008-05-26 23:31:22 +0100 | [diff] [blame] | 1112 | |
| 1113 | xen_setup_mfn_list_list(); |
Jeremy Fitzhardinge | 2e8fe71 | 2008-03-17 16:36:53 -0700 | [diff] [blame] | 1114 | } |
| 1115 | |
Rusty Russell | 5f054e3 | 2012-03-29 15:38:31 +1030 | [diff] [blame] | 1116 | /* This is called once we have the cpu_possible_mask */ |
Jeremy Fitzhardinge | 0e91398 | 2008-05-26 23:31:27 +0100 | [diff] [blame] | 1117 | void xen_setup_vcpu_info_placement(void) |
Jeremy Fitzhardinge | 60223a3 | 2007-07-17 18:37:07 -0700 | [diff] [blame] | 1118 | { |
| 1119 | int cpu; |
| 1120 | |
| 1121 | for_each_possible_cpu(cpu) |
| 1122 | xen_vcpu_setup(cpu); |
| 1123 | |
| 1124 | /* xen_vcpu_setup managed to place the vcpu_info within the |
Mukesh Rathor | 2771374 | 2013-12-11 15:36:51 -0500 | [diff] [blame] | 1125 | * percpu area for all cpus, so make use of it. Note that for |
| 1126 | * PVH we want to use native IRQ mechanism. */ |
| 1127 | if (have_vcpu_info_placement && !xen_pvh_domain()) { |
Jeremy Fitzhardinge | ecb93d1 | 2009-01-28 14:35:05 -0800 | [diff] [blame] | 1128 | pv_irq_ops.save_fl = __PV_IS_CALLEE_SAVE(xen_save_fl_direct); |
| 1129 | pv_irq_ops.restore_fl = __PV_IS_CALLEE_SAVE(xen_restore_fl_direct); |
| 1130 | pv_irq_ops.irq_disable = __PV_IS_CALLEE_SAVE(xen_irq_disable_direct); |
| 1131 | pv_irq_ops.irq_enable = __PV_IS_CALLEE_SAVE(xen_irq_enable_direct); |
Jeremy Fitzhardinge | 93b1eab | 2007-10-16 11:51:29 -0700 | [diff] [blame] | 1132 | pv_mmu_ops.read_cr2 = xen_read_cr2_direct; |
Jeremy Fitzhardinge | 60223a3 | 2007-07-17 18:37:07 -0700 | [diff] [blame] | 1133 | } |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 1134 | } |
| 1135 | |
Andi Kleen | ab144f5 | 2007-08-10 22:31:03 +0200 | [diff] [blame] | 1136 | static unsigned xen_patch(u8 type, u16 clobbers, void *insnbuf, |
| 1137 | unsigned long addr, unsigned len) |
Jeremy Fitzhardinge | 6487673 | 2007-07-17 18:37:07 -0700 | [diff] [blame] | 1138 | { |
| 1139 | char *start, *end, *reloc; |
| 1140 | unsigned ret; |
| 1141 | |
| 1142 | start = end = reloc = NULL; |
| 1143 | |
Jeremy Fitzhardinge | 93b1eab | 2007-10-16 11:51:29 -0700 | [diff] [blame] | 1144 | #define SITE(op, x) \ |
| 1145 | case PARAVIRT_PATCH(op.x): \ |
Jeremy Fitzhardinge | 6487673 | 2007-07-17 18:37:07 -0700 | [diff] [blame] | 1146 | if (have_vcpu_info_placement) { \ |
| 1147 | start = (char *)xen_##x##_direct; \ |
| 1148 | end = xen_##x##_direct_end; \ |
| 1149 | reloc = xen_##x##_direct_reloc; \ |
| 1150 | } \ |
| 1151 | goto patch_site |
| 1152 | |
| 1153 | switch (type) { |
Jeremy Fitzhardinge | 93b1eab | 2007-10-16 11:51:29 -0700 | [diff] [blame] | 1154 | SITE(pv_irq_ops, irq_enable); |
| 1155 | SITE(pv_irq_ops, irq_disable); |
| 1156 | SITE(pv_irq_ops, save_fl); |
| 1157 | SITE(pv_irq_ops, restore_fl); |
Jeremy Fitzhardinge | 6487673 | 2007-07-17 18:37:07 -0700 | [diff] [blame] | 1158 | #undef SITE |
| 1159 | |
| 1160 | patch_site: |
| 1161 | if (start == NULL || (end-start) > len) |
| 1162 | goto default_patch; |
| 1163 | |
Andi Kleen | ab144f5 | 2007-08-10 22:31:03 +0200 | [diff] [blame] | 1164 | ret = paravirt_patch_insns(insnbuf, len, start, end); |
Jeremy Fitzhardinge | 6487673 | 2007-07-17 18:37:07 -0700 | [diff] [blame] | 1165 | |
| 1166 | /* Note: because reloc is assigned from something that |
| 1167 | appears to be an array, gcc assumes it's non-null, |
| 1168 | but doesn't know its relationship with start and |
| 1169 | end. */ |
| 1170 | if (reloc > start && reloc < end) { |
| 1171 | int reloc_off = reloc - start; |
Andi Kleen | ab144f5 | 2007-08-10 22:31:03 +0200 | [diff] [blame] | 1172 | long *relocp = (long *)(insnbuf + reloc_off); |
| 1173 | long delta = start - (char *)addr; |
Jeremy Fitzhardinge | 6487673 | 2007-07-17 18:37:07 -0700 | [diff] [blame] | 1174 | |
| 1175 | *relocp += delta; |
| 1176 | } |
| 1177 | break; |
| 1178 | |
| 1179 | default_patch: |
| 1180 | default: |
Andi Kleen | ab144f5 | 2007-08-10 22:31:03 +0200 | [diff] [blame] | 1181 | ret = paravirt_patch_default(type, clobbers, insnbuf, |
| 1182 | addr, len); |
Jeremy Fitzhardinge | 6487673 | 2007-07-17 18:37:07 -0700 | [diff] [blame] | 1183 | break; |
| 1184 | } |
| 1185 | |
| 1186 | return ret; |
| 1187 | } |
| 1188 | |
Daniel Kiper | ad3062a | 2011-05-04 20:15:18 +0200 | [diff] [blame] | 1189 | static const struct pv_info xen_info __initconst = { |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 1190 | .paravirt_enabled = 1, |
| 1191 | .shared_kernel_pmd = 0, |
| 1192 | |
Andy Lutomirski | 318f5a2 | 2011-08-03 09:31:53 -0400 | [diff] [blame] | 1193 | #ifdef CONFIG_X86_64 |
| 1194 | .extra_user_64bit_cs = FLAT_USER_CS64, |
| 1195 | #endif |
David Vrabel | d8c98a1 | 2015-12-11 09:07:53 -0500 | [diff] [blame] | 1196 | .features = 0, |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 1197 | .name = "Xen", |
Jeremy Fitzhardinge | 93b1eab | 2007-10-16 11:51:29 -0700 | [diff] [blame] | 1198 | }; |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 1199 | |
Daniel Kiper | ad3062a | 2011-05-04 20:15:18 +0200 | [diff] [blame] | 1200 | static const struct pv_init_ops xen_init_ops __initconst = { |
Jeremy Fitzhardinge | 6487673 | 2007-07-17 18:37:07 -0700 | [diff] [blame] | 1201 | .patch = xen_patch, |
Jeremy Fitzhardinge | 93b1eab | 2007-10-16 11:51:29 -0700 | [diff] [blame] | 1202 | }; |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 1203 | |
Daniel Kiper | ad3062a | 2011-05-04 20:15:18 +0200 | [diff] [blame] | 1204 | static const struct pv_cpu_ops xen_cpu_ops __initconst = { |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 1205 | .cpuid = xen_cpuid, |
| 1206 | |
| 1207 | .set_debugreg = xen_set_debugreg, |
| 1208 | .get_debugreg = xen_get_debugreg, |
| 1209 | |
Jeremy Fitzhardinge | 7b1333a | 2008-05-26 23:31:01 +0100 | [diff] [blame] | 1210 | .clts = xen_clts, |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 1211 | |
Jeremy Fitzhardinge | a789ed5 | 2009-04-24 00:26:50 -0700 | [diff] [blame] | 1212 | .read_cr0 = xen_read_cr0, |
Jeremy Fitzhardinge | 7b1333a | 2008-05-26 23:31:01 +0100 | [diff] [blame] | 1213 | .write_cr0 = xen_write_cr0, |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 1214 | |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 1215 | .read_cr4 = native_read_cr4, |
| 1216 | .read_cr4_safe = native_read_cr4_safe, |
| 1217 | .write_cr4 = xen_write_cr4, |
| 1218 | |
Konrad Rzeszutek Wilk | 1a7bbda | 2012-10-10 13:25:48 -0400 | [diff] [blame] | 1219 | #ifdef CONFIG_X86_64 |
| 1220 | .read_cr8 = xen_read_cr8, |
| 1221 | .write_cr8 = xen_write_cr8, |
| 1222 | #endif |
| 1223 | |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 1224 | .wbinvd = native_wbinvd, |
| 1225 | |
Boris Ostrovsky | 31795b47 | 2015-02-11 14:39:18 -0500 | [diff] [blame] | 1226 | .read_msr = xen_read_msr_safe, |
Jeremy Fitzhardinge | 1153968 | 2008-07-08 15:07:16 -0700 | [diff] [blame] | 1227 | .write_msr = xen_write_msr_safe, |
Konrad Rzeszutek Wilk | 1ab46fd | 2012-05-30 18:23:56 -0400 | [diff] [blame] | 1228 | |
Boris Ostrovsky | 65d0cf0 | 2015-08-10 16:34:34 -0400 | [diff] [blame] | 1229 | .read_pmc = xen_read_pmc, |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 1230 | |
Jeremy Fitzhardinge | 81e103f | 2008-04-17 17:40:51 +0200 | [diff] [blame] | 1231 | .iret = xen_iret, |
Jeremy Fitzhardinge | 6fcac6d | 2008-07-08 15:07:14 -0700 | [diff] [blame] | 1232 | #ifdef CONFIG_X86_64 |
Jeremy Fitzhardinge | 6fcac6d | 2008-07-08 15:07:14 -0700 | [diff] [blame] | 1233 | .usergs_sysret64 = xen_sysret64, |
| 1234 | #endif |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 1235 | |
| 1236 | .load_tr_desc = paravirt_nop, |
| 1237 | .set_ldt = xen_set_ldt, |
| 1238 | .load_gdt = xen_load_gdt, |
| 1239 | .load_idt = xen_load_idt, |
| 1240 | .load_tls = xen_load_tls, |
Eduardo Habkost | a8fc108 | 2008-07-08 15:07:05 -0700 | [diff] [blame] | 1241 | #ifdef CONFIG_X86_64 |
| 1242 | .load_gs_index = xen_load_gs_index, |
| 1243 | #endif |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 1244 | |
Jeremy Fitzhardinge | 38ffbe6 | 2008-07-23 14:21:18 -0700 | [diff] [blame] | 1245 | .alloc_ldt = xen_alloc_ldt, |
| 1246 | .free_ldt = xen_free_ldt, |
| 1247 | |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 1248 | .store_idt = native_store_idt, |
| 1249 | .store_tr = xen_store_tr, |
| 1250 | |
| 1251 | .write_ldt_entry = xen_write_ldt_entry, |
| 1252 | .write_gdt_entry = xen_write_gdt_entry, |
| 1253 | .write_idt_entry = xen_write_idt_entry, |
H. Peter Anvin | faca622 | 2008-01-30 13:31:02 +0100 | [diff] [blame] | 1254 | .load_sp0 = xen_load_sp0, |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 1255 | |
| 1256 | .set_iopl_mask = xen_set_iopl_mask, |
| 1257 | .io_delay = xen_io_delay, |
| 1258 | |
Jeremy Fitzhardinge | 952d1d7 | 2008-07-08 15:07:01 -0700 | [diff] [blame] | 1259 | /* Xen takes care of %gs when switching to usermode for us */ |
| 1260 | .swapgs = paravirt_nop, |
| 1261 | |
Jeremy Fitzhardinge | 224101e | 2009-02-18 11:18:57 -0800 | [diff] [blame] | 1262 | .start_context_switch = paravirt_start_context_switch, |
| 1263 | .end_context_switch = xen_end_context_switch, |
Jeremy Fitzhardinge | 93b1eab | 2007-10-16 11:51:29 -0700 | [diff] [blame] | 1264 | }; |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 1265 | |
Jeremy Fitzhardinge | fefa629 | 2007-07-17 18:37:07 -0700 | [diff] [blame] | 1266 | static void xen_reboot(int reason) |
| 1267 | { |
Jeremy Fitzhardinge | 349c709 | 2008-05-26 23:31:02 +0100 | [diff] [blame] | 1268 | struct sched_shutdown r = { .reason = reason }; |
Boris Ostrovsky | 65d0cf0 | 2015-08-10 16:34:34 -0400 | [diff] [blame] | 1269 | int cpu; |
| 1270 | |
| 1271 | for_each_online_cpu(cpu) |
| 1272 | xen_pmu_finish(cpu); |
Jeremy Fitzhardinge | 349c709 | 2008-05-26 23:31:02 +0100 | [diff] [blame] | 1273 | |
Jeremy Fitzhardinge | 349c709 | 2008-05-26 23:31:02 +0100 | [diff] [blame] | 1274 | if (HYPERVISOR_sched_op(SCHEDOP_shutdown, &r)) |
Jeremy Fitzhardinge | fefa629 | 2007-07-17 18:37:07 -0700 | [diff] [blame] | 1275 | BUG(); |
| 1276 | } |
| 1277 | |
| 1278 | static void xen_restart(char *msg) |
| 1279 | { |
| 1280 | xen_reboot(SHUTDOWN_reboot); |
| 1281 | } |
| 1282 | |
| 1283 | static void xen_emergency_restart(void) |
| 1284 | { |
| 1285 | xen_reboot(SHUTDOWN_reboot); |
| 1286 | } |
| 1287 | |
| 1288 | static void xen_machine_halt(void) |
| 1289 | { |
| 1290 | xen_reboot(SHUTDOWN_poweroff); |
| 1291 | } |
| 1292 | |
Tom Goetz | b2abe50 | 2011-05-16 15:06:26 -0400 | [diff] [blame] | 1293 | static void xen_machine_power_off(void) |
| 1294 | { |
| 1295 | if (pm_power_off) |
| 1296 | pm_power_off(); |
| 1297 | xen_reboot(SHUTDOWN_poweroff); |
| 1298 | } |
| 1299 | |
Jeremy Fitzhardinge | fefa629 | 2007-07-17 18:37:07 -0700 | [diff] [blame] | 1300 | static void xen_crash_shutdown(struct pt_regs *regs) |
| 1301 | { |
| 1302 | xen_reboot(SHUTDOWN_crash); |
| 1303 | } |
| 1304 | |
Donald Dutile | f09f6d1 | 2010-07-15 14:56:49 -0400 | [diff] [blame] | 1305 | static int |
| 1306 | xen_panic_event(struct notifier_block *this, unsigned long event, void *ptr) |
| 1307 | { |
Ian Campbell | 086748e | 2010-08-03 14:55:14 -0700 | [diff] [blame] | 1308 | xen_reboot(SHUTDOWN_crash); |
Donald Dutile | f09f6d1 | 2010-07-15 14:56:49 -0400 | [diff] [blame] | 1309 | return NOTIFY_DONE; |
| 1310 | } |
| 1311 | |
| 1312 | static struct notifier_block xen_panic_block = { |
| 1313 | .notifier_call= xen_panic_event, |
Radim Krčmář | bc5eb20 | 2014-05-13 18:56:25 +0200 | [diff] [blame] | 1314 | .priority = INT_MIN |
Donald Dutile | f09f6d1 | 2010-07-15 14:56:49 -0400 | [diff] [blame] | 1315 | }; |
| 1316 | |
| 1317 | int xen_panic_handler_init(void) |
| 1318 | { |
| 1319 | atomic_notifier_chain_register(&panic_notifier_list, &xen_panic_block); |
| 1320 | return 0; |
| 1321 | } |
| 1322 | |
Daniel Kiper | ad3062a | 2011-05-04 20:15:18 +0200 | [diff] [blame] | 1323 | static const struct machine_ops xen_machine_ops __initconst = { |
Jeremy Fitzhardinge | fefa629 | 2007-07-17 18:37:07 -0700 | [diff] [blame] | 1324 | .restart = xen_restart, |
| 1325 | .halt = xen_machine_halt, |
Tom Goetz | b2abe50 | 2011-05-16 15:06:26 -0400 | [diff] [blame] | 1326 | .power_off = xen_machine_power_off, |
Jeremy Fitzhardinge | fefa629 | 2007-07-17 18:37:07 -0700 | [diff] [blame] | 1327 | .shutdown = xen_machine_halt, |
| 1328 | .crash_shutdown = xen_crash_shutdown, |
| 1329 | .emergency_restart = xen_emergency_restart, |
| 1330 | }; |
| 1331 | |
Jan Beulich | f221b04 | 2015-01-13 07:40:05 +0000 | [diff] [blame] | 1332 | static unsigned char xen_get_nmi_reason(void) |
| 1333 | { |
| 1334 | unsigned char reason = 0; |
| 1335 | |
| 1336 | /* Construct a value which looks like it came from port 0x61. */ |
| 1337 | if (test_bit(_XEN_NMIREASON_io_error, |
| 1338 | &HYPERVISOR_shared_info->arch.nmi_reason)) |
| 1339 | reason |= NMI_REASON_IOCHK; |
| 1340 | if (test_bit(_XEN_NMIREASON_pci_serr, |
| 1341 | &HYPERVISOR_shared_info->arch.nmi_reason)) |
| 1342 | reason |= NMI_REASON_SERR; |
| 1343 | |
| 1344 | return reason; |
| 1345 | } |
| 1346 | |
David Vrabel | 96f28bc | 2013-04-03 17:31:50 +0100 | [diff] [blame] | 1347 | static void __init xen_boot_params_init_edd(void) |
| 1348 | { |
| 1349 | #if IS_ENABLED(CONFIG_EDD) |
| 1350 | struct xen_platform_op op; |
| 1351 | struct edd_info *edd_info; |
| 1352 | u32 *mbr_signature; |
| 1353 | unsigned nr; |
| 1354 | int ret; |
| 1355 | |
| 1356 | edd_info = boot_params.eddbuf; |
| 1357 | mbr_signature = boot_params.edd_mbr_sig_buffer; |
| 1358 | |
| 1359 | op.cmd = XENPF_firmware_info; |
| 1360 | |
| 1361 | op.u.firmware_info.type = XEN_FW_DISK_INFO; |
| 1362 | for (nr = 0; nr < EDDMAXNR; nr++) { |
| 1363 | struct edd_info *info = edd_info + nr; |
| 1364 | |
| 1365 | op.u.firmware_info.index = nr; |
| 1366 | info->params.length = sizeof(info->params); |
| 1367 | set_xen_guest_handle(op.u.firmware_info.u.disk_info.edd_params, |
| 1368 | &info->params); |
Stefano Stabellini | cfafae9 | 2015-11-23 10:36:12 +0000 | [diff] [blame] | 1369 | ret = HYPERVISOR_platform_op(&op); |
David Vrabel | 96f28bc | 2013-04-03 17:31:50 +0100 | [diff] [blame] | 1370 | if (ret) |
| 1371 | break; |
| 1372 | |
| 1373 | #define C(x) info->x = op.u.firmware_info.u.disk_info.x |
| 1374 | C(device); |
| 1375 | C(version); |
| 1376 | C(interface_support); |
| 1377 | C(legacy_max_cylinder); |
| 1378 | C(legacy_max_head); |
| 1379 | C(legacy_sectors_per_track); |
| 1380 | #undef C |
| 1381 | } |
| 1382 | boot_params.eddbuf_entries = nr; |
| 1383 | |
| 1384 | op.u.firmware_info.type = XEN_FW_DISK_MBR_SIGNATURE; |
| 1385 | for (nr = 0; nr < EDD_MBR_SIG_MAX; nr++) { |
| 1386 | op.u.firmware_info.index = nr; |
Stefano Stabellini | cfafae9 | 2015-11-23 10:36:12 +0000 | [diff] [blame] | 1387 | ret = HYPERVISOR_platform_op(&op); |
David Vrabel | 96f28bc | 2013-04-03 17:31:50 +0100 | [diff] [blame] | 1388 | if (ret) |
| 1389 | break; |
| 1390 | mbr_signature[nr] = op.u.firmware_info.u.disk_mbr_signature.mbr_signature; |
| 1391 | } |
| 1392 | boot_params.edd_mbr_sig_buf_entries = nr; |
| 1393 | #endif |
| 1394 | } |
| 1395 | |
Jeremy Fitzhardinge | 577eebe | 2009-08-27 12:46:35 -0700 | [diff] [blame] | 1396 | /* |
| 1397 | * Set up the GDT and segment registers for -fstack-protector. Until |
| 1398 | * we do this, we have to be careful not to call any stack-protected |
| 1399 | * function, which is most of the kernel. |
Mukesh Rathor | 5840c84 | 2013-12-13 11:48:08 -0500 | [diff] [blame] | 1400 | * |
| 1401 | * Note, that it is __ref because the only caller of this after init |
| 1402 | * is PVH which is not going to use xen_load_gdt_boot or other |
| 1403 | * __init functions. |
Jeremy Fitzhardinge | 577eebe | 2009-08-27 12:46:35 -0700 | [diff] [blame] | 1404 | */ |
Roger Pau Monne | c9f6e99 | 2014-01-20 09:20:07 -0500 | [diff] [blame] | 1405 | static void __ref xen_setup_gdt(int cpu) |
Jeremy Fitzhardinge | 577eebe | 2009-08-27 12:46:35 -0700 | [diff] [blame] | 1406 | { |
Mukesh Rathor | 8d656bb | 2013-12-13 13:03:37 -0500 | [diff] [blame] | 1407 | if (xen_feature(XENFEAT_auto_translated_physmap)) { |
| 1408 | #ifdef CONFIG_X86_64 |
| 1409 | unsigned long dummy; |
| 1410 | |
Mukesh Rathor | 5840c84 | 2013-12-13 11:48:08 -0500 | [diff] [blame] | 1411 | load_percpu_segment(cpu); /* We need to access per-cpu area */ |
| 1412 | switch_to_new_gdt(cpu); /* GDT and GS set */ |
Mukesh Rathor | 8d656bb | 2013-12-13 13:03:37 -0500 | [diff] [blame] | 1413 | |
| 1414 | /* We are switching of the Xen provided GDT to our HVM mode |
| 1415 | * GDT. The new GDT has __KERNEL_CS with CS.L = 1 |
| 1416 | * and we are jumping to reload it. |
| 1417 | */ |
| 1418 | asm volatile ("pushq %0\n" |
| 1419 | "leaq 1f(%%rip),%0\n" |
| 1420 | "pushq %0\n" |
| 1421 | "lretq\n" |
| 1422 | "1:\n" |
| 1423 | : "=&r" (dummy) : "0" (__KERNEL_CS)); |
| 1424 | |
| 1425 | /* |
| 1426 | * While not needed, we also set the %es, %ds, and %fs |
| 1427 | * to zero. We don't care about %ss as it is NULL. |
| 1428 | * Strictly speaking this is not needed as Xen zeros those |
| 1429 | * out (and also MSR_FS_BASE, MSR_GS_BASE, MSR_KERNEL_GS_BASE) |
| 1430 | * |
| 1431 | * Linux zeros them in cpu_init() and in secondary_startup_64 |
| 1432 | * (for BSP). |
| 1433 | */ |
| 1434 | loadsegment(es, 0); |
| 1435 | loadsegment(ds, 0); |
| 1436 | loadsegment(fs, 0); |
| 1437 | #else |
| 1438 | /* PVH: TODO Implement. */ |
| 1439 | BUG(); |
| 1440 | #endif |
| 1441 | return; /* PVH does not need any PV GDT ops. */ |
| 1442 | } |
Jeremy Fitzhardinge | 577eebe | 2009-08-27 12:46:35 -0700 | [diff] [blame] | 1443 | pv_cpu_ops.write_gdt_entry = xen_write_gdt_entry_boot; |
| 1444 | pv_cpu_ops.load_gdt = xen_load_gdt_boot; |
| 1445 | |
| 1446 | setup_stack_canary_segment(0); |
| 1447 | switch_to_new_gdt(0); |
| 1448 | |
| 1449 | pv_cpu_ops.write_gdt_entry = xen_write_gdt_entry; |
| 1450 | pv_cpu_ops.load_gdt = xen_load_gdt; |
| 1451 | } |
| 1452 | |
Mukesh Rathor | a2ef5dc | 2014-09-10 16:36:06 -0700 | [diff] [blame] | 1453 | #ifdef CONFIG_XEN_PVH |
Roger Pau Monne | c9f6e99 | 2014-01-20 09:20:07 -0500 | [diff] [blame] | 1454 | /* |
| 1455 | * A PV guest starts with default flags that are not set for PVH, set them |
| 1456 | * here asap. |
| 1457 | */ |
| 1458 | static void xen_pvh_set_cr_flags(int cpu) |
| 1459 | { |
| 1460 | |
| 1461 | /* Some of these are setup in 'secondary_startup_64'. The others: |
| 1462 | * X86_CR0_TS, X86_CR0_PE, X86_CR0_ET are set by Xen for HVM guests |
| 1463 | * (which PVH shared codepaths), while X86_CR0_PG is for PVH. */ |
| 1464 | write_cr0(read_cr0() | X86_CR0_MP | X86_CR0_NE | X86_CR0_WP | X86_CR0_AM); |
Mukesh Rathor | afca501 | 2014-01-29 16:15:18 -0800 | [diff] [blame] | 1465 | |
| 1466 | if (!cpu) |
| 1467 | return; |
| 1468 | /* |
| 1469 | * For BSP, PSE PGE are set in probe_page_size_mask(), for APs |
Ingo Molnar | 21c4cd1 | 2015-04-26 14:27:17 +0200 | [diff] [blame] | 1470 | * set them here. For all, OSFXSR OSXMMEXCPT are set in fpu__init_cpu(). |
Mukesh Rathor | afca501 | 2014-01-29 16:15:18 -0800 | [diff] [blame] | 1471 | */ |
| 1472 | if (cpu_has_pse) |
Andy Lutomirski | 375074c | 2014-10-24 15:58:07 -0700 | [diff] [blame] | 1473 | cr4_set_bits_and_update_boot(X86_CR4_PSE); |
Mukesh Rathor | afca501 | 2014-01-29 16:15:18 -0800 | [diff] [blame] | 1474 | |
| 1475 | if (cpu_has_pge) |
Andy Lutomirski | 375074c | 2014-10-24 15:58:07 -0700 | [diff] [blame] | 1476 | cr4_set_bits_and_update_boot(X86_CR4_PGE); |
Roger Pau Monne | c9f6e99 | 2014-01-20 09:20:07 -0500 | [diff] [blame] | 1477 | } |
| 1478 | |
| 1479 | /* |
| 1480 | * Note, that it is ref - because the only caller of this after init |
| 1481 | * is PVH which is not going to use xen_load_gdt_boot or other |
| 1482 | * __init functions. |
| 1483 | */ |
| 1484 | void __ref xen_pvh_secondary_vcpu_init(int cpu) |
| 1485 | { |
| 1486 | xen_setup_gdt(cpu); |
| 1487 | xen_pvh_set_cr_flags(cpu); |
| 1488 | } |
| 1489 | |
Mukesh Rathor | d285d68 | 2013-12-13 12:45:31 -0500 | [diff] [blame] | 1490 | static void __init xen_pvh_early_guest_init(void) |
| 1491 | { |
| 1492 | if (!xen_feature(XENFEAT_auto_translated_physmap)) |
| 1493 | return; |
| 1494 | |
Roger Pau Monne | c9f6e99 | 2014-01-20 09:20:07 -0500 | [diff] [blame] | 1495 | if (!xen_feature(XENFEAT_hvm_callback_vector)) |
| 1496 | return; |
| 1497 | |
| 1498 | xen_have_vector_callback = 1; |
Mukesh Rathor | a2ef5dc | 2014-09-10 16:36:06 -0700 | [diff] [blame] | 1499 | |
| 1500 | xen_pvh_early_cpu_init(0, false); |
Roger Pau Monne | c9f6e99 | 2014-01-20 09:20:07 -0500 | [diff] [blame] | 1501 | xen_pvh_set_cr_flags(0); |
Mukesh Rathor | d285d68 | 2013-12-13 12:45:31 -0500 | [diff] [blame] | 1502 | |
| 1503 | #ifdef CONFIG_X86_32 |
| 1504 | BUG(); /* PVH: Implement proper support. */ |
| 1505 | #endif |
| 1506 | } |
Mukesh Rathor | a2ef5dc | 2014-09-10 16:36:06 -0700 | [diff] [blame] | 1507 | #endif /* CONFIG_XEN_PVH */ |
Mukesh Rathor | d285d68 | 2013-12-13 12:45:31 -0500 | [diff] [blame] | 1508 | |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 1509 | /* First C function to be called on Xen boot */ |
Andi Kleen | 2605fc2 | 2014-05-02 00:44:37 +0200 | [diff] [blame] | 1510 | asmlinkage __visible void __init xen_start_kernel(void) |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 1511 | { |
Konrad Rzeszutek Wilk | ec35a69 | 2010-11-16 12:09:59 -0500 | [diff] [blame] | 1512 | struct physdev_set_iopl set_iopl; |
Juergen Gross | d1e9abd | 2014-09-17 06:12:36 +0200 | [diff] [blame] | 1513 | unsigned long initrd_start = 0; |
Borislav Petkov | 9cd25aa | 2015-06-04 18:55:10 +0200 | [diff] [blame] | 1514 | u64 pat; |
Konrad Rzeszutek Wilk | ec35a69 | 2010-11-16 12:09:59 -0500 | [diff] [blame] | 1515 | int rc; |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 1516 | |
| 1517 | if (!xen_start_info) |
| 1518 | return; |
| 1519 | |
Jeremy Fitzhardinge | 6e83358 | 2008-08-19 13:16:17 -0700 | [diff] [blame] | 1520 | xen_domain_type = XEN_PV_DOMAIN; |
| 1521 | |
Mukesh Rathor | d285d68 | 2013-12-13 12:45:31 -0500 | [diff] [blame] | 1522 | xen_setup_features(); |
Mukesh Rathor | a2ef5dc | 2014-09-10 16:36:06 -0700 | [diff] [blame] | 1523 | #ifdef CONFIG_XEN_PVH |
Mukesh Rathor | d285d68 | 2013-12-13 12:45:31 -0500 | [diff] [blame] | 1524 | xen_pvh_early_guest_init(); |
Mukesh Rathor | a2ef5dc | 2014-09-10 16:36:06 -0700 | [diff] [blame] | 1525 | #endif |
Ian Campbell | 7e77506 | 2010-09-30 12:37:26 +0100 | [diff] [blame] | 1526 | xen_setup_machphys_mapping(); |
| 1527 | |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 1528 | /* Install Xen paravirt ops */ |
Jeremy Fitzhardinge | 93b1eab | 2007-10-16 11:51:29 -0700 | [diff] [blame] | 1529 | pv_info = xen_info; |
David Vrabel | d8c98a1 | 2015-12-11 09:07:53 -0500 | [diff] [blame] | 1530 | if (xen_initial_domain()) |
| 1531 | pv_info.features |= PV_SUPPORTED_RTC; |
Jeremy Fitzhardinge | 93b1eab | 2007-10-16 11:51:29 -0700 | [diff] [blame] | 1532 | pv_init_ops = xen_init_ops; |
Jan Beulich | f221b04 | 2015-01-13 07:40:05 +0000 | [diff] [blame] | 1533 | if (!xen_pvh_domain()) { |
Mukesh Rathor | d285d68 | 2013-12-13 12:45:31 -0500 | [diff] [blame] | 1534 | pv_cpu_ops = xen_cpu_ops; |
Jeremy Fitzhardinge | 93b1eab | 2007-10-16 11:51:29 -0700 | [diff] [blame] | 1535 | |
Jan Beulich | f221b04 | 2015-01-13 07:40:05 +0000 | [diff] [blame] | 1536 | x86_platform.get_nmi_reason = xen_get_nmi_reason; |
| 1537 | } |
| 1538 | |
David Vrabel | abacaad | 2014-06-02 17:58:01 +0100 | [diff] [blame] | 1539 | if (xen_feature(XENFEAT_auto_translated_physmap)) |
| 1540 | x86_init.resources.memory_setup = xen_auto_xlated_memory_setup; |
| 1541 | else |
| 1542 | x86_init.resources.memory_setup = xen_memory_setup; |
Thomas Gleixner | 42bbdb4 | 2009-08-20 13:04:10 +0200 | [diff] [blame] | 1543 | x86_init.oem.arch_setup = xen_arch_setup; |
Thomas Gleixner | 6f30c1a | 2009-08-20 13:19:57 +0200 | [diff] [blame] | 1544 | x86_init.oem.banner = xen_banner; |
Thomas Gleixner | 845b394 | 2009-08-19 15:37:03 +0200 | [diff] [blame] | 1545 | |
Stefano Stabellini | 409771d | 2010-05-14 12:48:19 +0100 | [diff] [blame] | 1546 | xen_init_time_ops(); |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 1547 | |
Jeremy Fitzhardinge | ce2eef3 | 2009-08-17 12:26:53 -0700 | [diff] [blame] | 1548 | /* |
Jeremy Fitzhardinge | 577eebe | 2009-08-27 12:46:35 -0700 | [diff] [blame] | 1549 | * Set up some pagetable state before starting to set any ptes. |
Jeremy Fitzhardinge | ce2eef3 | 2009-08-17 12:26:53 -0700 | [diff] [blame] | 1550 | */ |
Jeremy Fitzhardinge | 577eebe | 2009-08-27 12:46:35 -0700 | [diff] [blame] | 1551 | |
Jeremy Fitzhardinge | 973df35 | 2009-10-27 16:54:19 -0700 | [diff] [blame] | 1552 | xen_init_mmu_ops(); |
| 1553 | |
Jeremy Fitzhardinge | 577eebe | 2009-08-27 12:46:35 -0700 | [diff] [blame] | 1554 | /* Prevent unwanted bits from being set in PTEs. */ |
| 1555 | __supported_pte_mask &= ~_PAGE_GLOBAL; |
Jeremy Fitzhardinge | 577eebe | 2009-08-27 12:46:35 -0700 | [diff] [blame] | 1556 | |
Ian Campbell | 817a824 | 2010-02-26 17:16:00 +0000 | [diff] [blame] | 1557 | /* |
| 1558 | * Prevent page tables from being allocated in highmem, even |
| 1559 | * if CONFIG_HIGHPTE is enabled. |
| 1560 | */ |
| 1561 | __userpte_alloc_gfp &= ~__GFP_HIGHMEM; |
| 1562 | |
Jeremy Fitzhardinge | b75fe4e | 2009-09-21 13:34:06 -0700 | [diff] [blame] | 1563 | /* Work out if we support NX */ |
H. Peter Anvin | 4763ed4 | 2009-11-13 15:28:16 -0800 | [diff] [blame] | 1564 | x86_configure_nx(); |
Jeremy Fitzhardinge | b75fe4e | 2009-09-21 13:34:06 -0700 | [diff] [blame] | 1565 | |
Jeremy Fitzhardinge | 577eebe | 2009-08-27 12:46:35 -0700 | [diff] [blame] | 1566 | /* Get mfn list */ |
Konrad Rzeszutek Wilk | 696fd7c | 2013-12-15 12:37:46 -0500 | [diff] [blame] | 1567 | xen_build_dynamic_phys_to_machine(); |
Jeremy Fitzhardinge | 577eebe | 2009-08-27 12:46:35 -0700 | [diff] [blame] | 1568 | |
| 1569 | /* |
| 1570 | * Set up kernel GDT and segment registers, mainly so that |
| 1571 | * -fstack-protector code can be executed. |
| 1572 | */ |
Mukesh Rathor | 5840c84 | 2013-12-13 11:48:08 -0500 | [diff] [blame] | 1573 | xen_setup_gdt(0); |
Jeremy Fitzhardinge | 0d1edf4 | 2008-07-28 11:53:57 -0700 | [diff] [blame] | 1574 | |
Jeremy Fitzhardinge | ce2eef3 | 2009-08-17 12:26:53 -0700 | [diff] [blame] | 1575 | xen_init_irq_ops(); |
Jeremy Fitzhardinge | e826fe1 | 2009-03-07 17:09:27 -0800 | [diff] [blame] | 1576 | xen_init_cpuid_mask(); |
| 1577 | |
Yinghai Lu | 94a8c3c | 2008-07-13 22:19:35 -0700 | [diff] [blame] | 1578 | #ifdef CONFIG_X86_LOCAL_APIC |
Suresh Siddha | ad66dd3 | 2008-07-11 13:11:56 -0700 | [diff] [blame] | 1579 | /* |
Yinghai Lu | 94a8c3c | 2008-07-13 22:19:35 -0700 | [diff] [blame] | 1580 | * set up the basic apic ops. |
Suresh Siddha | ad66dd3 | 2008-07-11 13:11:56 -0700 | [diff] [blame] | 1581 | */ |
Konrad Rzeszutek Wilk | feb44f1 | 2015-03-02 12:06:23 -0500 | [diff] [blame] | 1582 | xen_init_apic(); |
Suresh Siddha | ad66dd3 | 2008-07-11 13:11:56 -0700 | [diff] [blame] | 1583 | #endif |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 1584 | |
Jeremy Fitzhardinge | e57778a | 2008-06-16 04:30:02 -0700 | [diff] [blame] | 1585 | if (xen_feature(XENFEAT_mmu_pt_update_preserve_ad)) { |
| 1586 | pv_mmu_ops.ptep_modify_prot_start = xen_ptep_modify_prot_start; |
| 1587 | pv_mmu_ops.ptep_modify_prot_commit = xen_ptep_modify_prot_commit; |
| 1588 | } |
| 1589 | |
Jeremy Fitzhardinge | fefa629 | 2007-07-17 18:37:07 -0700 | [diff] [blame] | 1590 | machine_ops = xen_machine_ops; |
| 1591 | |
Jeremy Fitzhardinge | 3834143 | 2009-02-02 13:55:31 -0800 | [diff] [blame] | 1592 | /* |
| 1593 | * The only reliable way to retain the initial address of the |
| 1594 | * percpu gdt_page is to remember it here, so we can go and |
| 1595 | * mark it RW later, when the initial percpu area is freed. |
| 1596 | */ |
| 1597 | xen_initial_gdt = &per_cpu(gdt_page, 0); |
Jeremy Fitzhardinge | 795f99b | 2009-01-30 17:47:54 +0900 | [diff] [blame] | 1598 | |
Jeremy Fitzhardinge | a9e7062 | 2008-07-08 15:06:41 -0700 | [diff] [blame] | 1599 | xen_smp_init(); |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 1600 | |
Ian Campbell | c1f5db1 | 2010-12-03 09:54:03 +0000 | [diff] [blame] | 1601 | #ifdef CONFIG_ACPI_NUMA |
| 1602 | /* |
| 1603 | * The pages we from Xen are not related to machine pages, so |
| 1604 | * any NUMA information the kernel tries to get from ACPI will |
| 1605 | * be meaningless. Prevent it from trying. |
| 1606 | */ |
| 1607 | acpi_numa = -1; |
| 1608 | #endif |
Jeremy Fitzhardinge | 084a2a4 | 2008-07-08 15:06:50 -0700 | [diff] [blame] | 1609 | /* Don't do the full vcpu_info placement stuff until we have a |
| 1610 | possible map and a non-dummy shared_info. */ |
| 1611 | per_cpu(xen_vcpu, 0) = &HYPERVISOR_shared_info->vcpu_info[0]; |
| 1612 | |
Jeremy Fitzhardinge | 55d8085 | 2009-02-25 09:42:25 -0800 | [diff] [blame] | 1613 | local_irq_disable(); |
Tejun Heo | 2ce802f | 2011-01-20 12:06:35 +0100 | [diff] [blame] | 1614 | early_boot_irqs_disabled = true; |
Jeremy Fitzhardinge | 55d8085 | 2009-02-25 09:42:25 -0800 | [diff] [blame] | 1615 | |
Jeremy Fitzhardinge | 084a2a4 | 2008-07-08 15:06:50 -0700 | [diff] [blame] | 1616 | xen_raw_console_write("mapping kernel into physical memory\n"); |
Juergen Gross | 6c2681c | 2015-07-17 06:51:34 +0200 | [diff] [blame] | 1617 | xen_setup_kernel_pagetable((pgd_t *)xen_start_info->pt_base, |
| 1618 | xen_start_info->nr_pages); |
| 1619 | xen_reserve_special_pages(); |
Jeremy Fitzhardinge | 084a2a4 | 2008-07-08 15:06:50 -0700 | [diff] [blame] | 1620 | |
Juergen Gross | 47591df | 2014-11-03 14:02:04 +0100 | [diff] [blame] | 1621 | /* |
| 1622 | * Modify the cache mode translation tables to match Xen's PAT |
| 1623 | * configuration. |
| 1624 | */ |
Borislav Petkov | 9cd25aa | 2015-06-04 18:55:10 +0200 | [diff] [blame] | 1625 | rdmsrl(MSR_IA32_CR_PAT, pat); |
| 1626 | pat_init_cache_modes(pat); |
Juergen Gross | 47591df | 2014-11-03 14:02:04 +0100 | [diff] [blame] | 1627 | |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 1628 | /* keep using Xen gdt for now; no urgent need to change it */ |
| 1629 | |
Ian Campbell | e68266b | 2010-01-13 10:16:08 +0000 | [diff] [blame] | 1630 | #ifdef CONFIG_X86_32 |
Jeremy Fitzhardinge | 93b1eab | 2007-10-16 11:51:29 -0700 | [diff] [blame] | 1631 | pv_info.kernel_rpl = 1; |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 1632 | if (xen_feature(XENFEAT_supervisor_mode_kernel)) |
Jeremy Fitzhardinge | 93b1eab | 2007-10-16 11:51:29 -0700 | [diff] [blame] | 1633 | pv_info.kernel_rpl = 0; |
Ian Campbell | e68266b | 2010-01-13 10:16:08 +0000 | [diff] [blame] | 1634 | #else |
| 1635 | pv_info.kernel_rpl = 0; |
| 1636 | #endif |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 1637 | /* set the limit of our address space */ |
Jeremy Fitzhardinge | fb1d840 | 2007-10-16 11:51:31 -0700 | [diff] [blame] | 1638 | xen_reserve_top(); |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 1639 | |
Mukesh Rathor | d285d68 | 2013-12-13 12:45:31 -0500 | [diff] [blame] | 1640 | /* PVH: runs at default kernel iopl of 0 */ |
| 1641 | if (!xen_pvh_domain()) { |
| 1642 | /* |
| 1643 | * We used to do this in xen_arch_setup, but that is too late |
| 1644 | * on AMD were early_cpu_init (run before ->arch_setup()) calls |
| 1645 | * early_amd_init which pokes 0xcf8 port. |
| 1646 | */ |
| 1647 | set_iopl.iopl = 1; |
| 1648 | rc = HYPERVISOR_physdev_op(PHYSDEVOP_set_iopl, &set_iopl); |
| 1649 | if (rc != 0) |
| 1650 | xen_raw_printk("physdev_op failed %d\n", rc); |
| 1651 | } |
Konrad Rzeszutek Wilk | ec35a69 | 2010-11-16 12:09:59 -0500 | [diff] [blame] | 1652 | |
Jeremy Fitzhardinge | 7d087b6 | 2008-07-08 15:06:48 -0700 | [diff] [blame] | 1653 | #ifdef CONFIG_X86_32 |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 1654 | /* set up basic CPUID stuff */ |
| 1655 | cpu_detect(&new_cpu_data); |
H. Peter Anvin | 60e019e | 2013-04-29 16:04:20 +0200 | [diff] [blame] | 1656 | set_cpu_cap(&new_cpu_data, X86_FEATURE_FPU); |
Jeremy Fitzhardinge | d560bc6 | 2009-08-25 12:53:02 -0700 | [diff] [blame] | 1657 | new_cpu_data.wp_works_ok = 1; |
Huaitong Han | 16aaa53 | 2016-01-25 20:41:47 +0100 | [diff] [blame] | 1658 | new_cpu_data.x86_capability[CPUID_1_EDX] = cpuid_edx(1); |
Jeremy Fitzhardinge | 7d087b6 | 2008-07-08 15:06:48 -0700 | [diff] [blame] | 1659 | #endif |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 1660 | |
Juergen Gross | d1e9abd | 2014-09-17 06:12:36 +0200 | [diff] [blame] | 1661 | if (xen_start_info->mod_start) { |
| 1662 | if (xen_start_info->flags & SIF_MOD_START_PFN) |
| 1663 | initrd_start = PFN_PHYS(xen_start_info->mod_start); |
| 1664 | else |
| 1665 | initrd_start = __pa(xen_start_info->mod_start); |
| 1666 | } |
| 1667 | |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 1668 | /* Poke various useful things into boot_params */ |
H. Peter Anvin | 30c8264 | 2007-10-15 17:13:22 -0700 | [diff] [blame] | 1669 | boot_params.hdr.type_of_loader = (9 << 4) | 0; |
Juergen Gross | d1e9abd | 2014-09-17 06:12:36 +0200 | [diff] [blame] | 1670 | boot_params.hdr.ramdisk_image = initrd_start; |
H. Peter Anvin | 30c8264 | 2007-10-15 17:13:22 -0700 | [diff] [blame] | 1671 | boot_params.hdr.ramdisk_size = xen_start_info->mod_len; |
Jeremy Fitzhardinge | b7c3c5c | 2008-07-08 15:07:07 -0700 | [diff] [blame] | 1672 | boot_params.hdr.cmd_line_ptr = __pa(xen_start_info->cmd_line); |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 1673 | |
Jeremy Fitzhardinge | 6e83358 | 2008-08-19 13:16:17 -0700 | [diff] [blame] | 1674 | if (!xen_initial_domain()) { |
Jeremy Fitzhardinge | 83abc70 | 2008-05-26 23:31:12 +0100 | [diff] [blame] | 1675 | add_preferred_console("xenboot", 0, NULL); |
Markus Armbruster | 9e124fe | 2008-05-26 23:31:07 +0100 | [diff] [blame] | 1676 | add_preferred_console("tty", 0, NULL); |
Markus Armbruster | b8c2d3d | 2008-02-27 14:56:35 +0100 | [diff] [blame] | 1677 | add_preferred_console("hvc", 0, NULL); |
Alex Nixon | b5401a9 | 2010-03-18 16:31:34 -0400 | [diff] [blame] | 1678 | if (pci_xen) |
| 1679 | x86_init.pci.arch_init = pci_xen_init; |
Chris Wright | 5d990b6 | 2009-12-04 12:15:21 -0800 | [diff] [blame] | 1680 | } else { |
Jeremy Fitzhardinge | c2419b4 | 2011-05-31 10:50:10 -0400 | [diff] [blame] | 1681 | const struct dom0_vga_console_info *info = |
| 1682 | (void *)((char *)xen_start_info + |
| 1683 | xen_start_info->console.dom0.info_off); |
Konrad Rzeszutek Wilk | ffb8b23 | 2012-09-21 12:30:35 -0400 | [diff] [blame] | 1684 | struct xen_platform_op op = { |
| 1685 | .cmd = XENPF_firmware_info, |
| 1686 | .interface_version = XENPF_INTERFACE_VERSION, |
| 1687 | .u.firmware_info.type = XEN_FW_KBD_SHIFT_FLAGS, |
| 1688 | }; |
Jeremy Fitzhardinge | c2419b4 | 2011-05-31 10:50:10 -0400 | [diff] [blame] | 1689 | |
| 1690 | xen_init_vga(info, xen_start_info->console.dom0.info_size); |
| 1691 | xen_start_info->console.domU.mfn = 0; |
| 1692 | xen_start_info->console.domU.evtchn = 0; |
| 1693 | |
Stefano Stabellini | cfafae9 | 2015-11-23 10:36:12 +0000 | [diff] [blame] | 1694 | if (HYPERVISOR_platform_op(&op) == 0) |
Konrad Rzeszutek Wilk | ffb8b23 | 2012-09-21 12:30:35 -0400 | [diff] [blame] | 1695 | boot_params.kbd_status = op.u.firmware_info.u.kbd_shift_flags; |
| 1696 | |
Chris Wright | 5d990b6 | 2009-12-04 12:15:21 -0800 | [diff] [blame] | 1697 | /* Make sure ACS will be enabled */ |
| 1698 | pci_request_acs(); |
Konrad Rzeszutek Wilk | 211063d | 2011-12-08 17:32:23 +0800 | [diff] [blame] | 1699 | |
| 1700 | xen_acpi_sleep_register(); |
Konrad Rzeszutek Wilk | bd49940 | 2012-09-19 08:30:55 -0400 | [diff] [blame] | 1701 | |
| 1702 | /* Avoid searching for BIOS MP tables */ |
| 1703 | x86_init.mpparse.find_smp_config = x86_init_noop; |
| 1704 | x86_init.mpparse.get_smp_config = x86_init_uint_noop; |
David Vrabel | 96f28bc | 2013-04-03 17:31:50 +0100 | [diff] [blame] | 1705 | |
| 1706 | xen_boot_params_init_edd(); |
Markus Armbruster | 9e124fe | 2008-05-26 23:31:07 +0100 | [diff] [blame] | 1707 | } |
David Vrabel | 76a8df7 | 2012-05-04 14:29:46 +0100 | [diff] [blame] | 1708 | #ifdef CONFIG_PCI |
| 1709 | /* PCI BIOS service won't work from a PV guest. */ |
| 1710 | pci_probe &= ~PCI_PROBE_BIOS; |
| 1711 | #endif |
Jeremy Fitzhardinge | 084a2a4 | 2008-07-08 15:06:50 -0700 | [diff] [blame] | 1712 | xen_raw_console_write("about to get started...\n"); |
| 1713 | |
Jeremy Fitzhardinge | 499d19b | 2009-11-24 09:38:25 -0800 | [diff] [blame] | 1714 | xen_setup_runstate_info(0); |
| 1715 | |
Daniel Kiper | c7341d6 | 2014-07-12 23:09:48 +0200 | [diff] [blame] | 1716 | xen_efi_init(); |
Daniel Kiper | be81c8a | 2014-06-30 19:53:02 +0200 | [diff] [blame] | 1717 | |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 1718 | /* Start the world */ |
Jeremy Fitzhardinge | f5d36de | 2008-07-08 15:06:39 -0700 | [diff] [blame] | 1719 | #ifdef CONFIG_X86_32 |
Yinghai Lu | f0d4310 | 2008-05-29 12:56:36 -0700 | [diff] [blame] | 1720 | i386_start_kernel(); |
Jeremy Fitzhardinge | f5d36de | 2008-07-08 15:06:39 -0700 | [diff] [blame] | 1721 | #else |
Boris Ostrovsky | 5054daa | 2015-02-23 11:01:00 -0500 | [diff] [blame] | 1722 | cr4_init_shadow(); /* 32b kernel does this in i386_start_kernel() */ |
Jeremy Fitzhardinge | 084a2a4 | 2008-07-08 15:06:50 -0700 | [diff] [blame] | 1723 | x86_64_start_reservations((char *)__pa_symbol(&boot_params)); |
Jeremy Fitzhardinge | f5d36de | 2008-07-08 15:06:39 -0700 | [diff] [blame] | 1724 | #endif |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 1725 | } |
Sheng Yang | bee6ab5 | 2010-05-14 12:39:33 +0100 | [diff] [blame] | 1726 | |
Konrad Rzeszutek Wilk | e9daff2 | 2013-02-14 21:29:31 -0500 | [diff] [blame] | 1727 | void __ref xen_hvm_init_shared_info(void) |
Olaf Hering | 9d02b43 | 2012-11-01 22:02:30 +0100 | [diff] [blame] | 1728 | { |
Konrad Rzeszutek Wilk | e9daff2 | 2013-02-14 21:29:31 -0500 | [diff] [blame] | 1729 | int cpu; |
Olaf Hering | 9d02b43 | 2012-11-01 22:02:30 +0100 | [diff] [blame] | 1730 | struct xen_add_to_physmap xatp; |
Konrad Rzeszutek Wilk | e9daff2 | 2013-02-14 21:29:31 -0500 | [diff] [blame] | 1731 | static struct shared_info *shared_info_page = 0; |
Olaf Hering | 9d02b43 | 2012-11-01 22:02:30 +0100 | [diff] [blame] | 1732 | |
Konrad Rzeszutek Wilk | e9daff2 | 2013-02-14 21:29:31 -0500 | [diff] [blame] | 1733 | if (!shared_info_page) |
| 1734 | shared_info_page = (struct shared_info *) |
| 1735 | extend_brk(PAGE_SIZE, PAGE_SIZE); |
Sheng Yang | bee6ab5 | 2010-05-14 12:39:33 +0100 | [diff] [blame] | 1736 | xatp.domid = DOMID_SELF; |
| 1737 | xatp.idx = 0; |
| 1738 | xatp.space = XENMAPSPACE_shared_info; |
Konrad Rzeszutek Wilk | e9daff2 | 2013-02-14 21:29:31 -0500 | [diff] [blame] | 1739 | xatp.gpfn = __pa(shared_info_page) >> PAGE_SHIFT; |
Sheng Yang | bee6ab5 | 2010-05-14 12:39:33 +0100 | [diff] [blame] | 1740 | if (HYPERVISOR_memory_op(XENMEM_add_to_physmap, &xatp)) |
| 1741 | BUG(); |
| 1742 | |
Konrad Rzeszutek Wilk | e9daff2 | 2013-02-14 21:29:31 -0500 | [diff] [blame] | 1743 | HYPERVISOR_shared_info = (struct shared_info *)shared_info_page; |
Sheng Yang | bee6ab5 | 2010-05-14 12:39:33 +0100 | [diff] [blame] | 1744 | |
Stefano Stabellini | 016b6f5 | 2010-05-14 12:45:07 +0100 | [diff] [blame] | 1745 | /* xen_vcpu is a pointer to the vcpu_info struct in the shared_info |
| 1746 | * page, we use it in the event channel upcall and in some pvclock |
| 1747 | * related functions. We don't need the vcpu_info placement |
| 1748 | * optimizations because we don't use any pv_mmu or pv_irq op on |
Konrad Rzeszutek Wilk | e9daff2 | 2013-02-14 21:29:31 -0500 | [diff] [blame] | 1749 | * HVM. |
| 1750 | * When xen_hvm_init_shared_info is run at boot time only vcpu 0 is |
| 1751 | * online but xen_hvm_init_shared_info is run at resume time too and |
| 1752 | * in that case multiple vcpus might be online. */ |
| 1753 | for_each_online_cpu(cpu) { |
Konrad Rzeszutek Wilk | d5b17db | 2013-05-05 09:24:07 -0400 | [diff] [blame] | 1754 | /* Leave it to be NULL. */ |
| 1755 | if (cpu >= MAX_VIRT_CPUS) |
| 1756 | continue; |
Stefano Stabellini | 016b6f5 | 2010-05-14 12:45:07 +0100 | [diff] [blame] | 1757 | per_cpu(xen_vcpu, cpu) = &HYPERVISOR_shared_info->vcpu_info[cpu]; |
Olaf Hering | 9d02b43 | 2012-11-01 22:02:30 +0100 | [diff] [blame] | 1758 | } |
Olaf Hering | 9d02b43 | 2012-11-01 22:02:30 +0100 | [diff] [blame] | 1759 | } |
| 1760 | |
Konrad Rzeszutek Wilk | e9daff2 | 2013-02-14 21:29:31 -0500 | [diff] [blame] | 1761 | #ifdef CONFIG_XEN_PVHVM |
Olaf Hering | 4ff2d06 | 2012-07-17 11:59:15 +0200 | [diff] [blame] | 1762 | static void __init init_hvm_pv_info(void) |
| 1763 | { |
Konrad Rzeszutek Wilk | e9daff2 | 2013-02-14 21:29:31 -0500 | [diff] [blame] | 1764 | int major, minor; |
Konrad Rzeszutek Wilk | 5eb65be | 2013-02-14 21:29:27 -0500 | [diff] [blame] | 1765 | uint32_t eax, ebx, ecx, edx, pages, msr, base; |
Sheng Yang | bee6ab5 | 2010-05-14 12:39:33 +0100 | [diff] [blame] | 1766 | u64 pfn; |
| 1767 | |
| 1768 | base = xen_cpuid_base(); |
Konrad Rzeszutek Wilk | e9daff2 | 2013-02-14 21:29:31 -0500 | [diff] [blame] | 1769 | cpuid(base + 1, &eax, &ebx, &ecx, &edx); |
| 1770 | |
| 1771 | major = eax >> 16; |
| 1772 | minor = eax & 0xffff; |
| 1773 | printk(KERN_INFO "Xen version %d.%d.\n", major, minor); |
| 1774 | |
Sheng Yang | bee6ab5 | 2010-05-14 12:39:33 +0100 | [diff] [blame] | 1775 | cpuid(base + 2, &pages, &msr, &ecx, &edx); |
| 1776 | |
| 1777 | pfn = __pa(hypercall_page); |
| 1778 | wrmsr_safe(msr, (u32)pfn, (u32)(pfn >> 32)); |
| 1779 | |
| 1780 | xen_setup_features(); |
| 1781 | |
| 1782 | pv_info.name = "Xen HVM"; |
| 1783 | |
| 1784 | xen_domain_type = XEN_HVM_DOMAIN; |
Sheng Yang | bee6ab5 | 2010-05-14 12:39:33 +0100 | [diff] [blame] | 1785 | } |
| 1786 | |
Paul Gortmaker | 148f9bb | 2013-06-18 18:23:59 -0400 | [diff] [blame] | 1787 | static int xen_hvm_cpu_notify(struct notifier_block *self, unsigned long action, |
| 1788 | void *hcpu) |
Sheng Yang | 38e20b0 | 2010-05-14 12:40:51 +0100 | [diff] [blame] | 1789 | { |
| 1790 | int cpu = (long)hcpu; |
| 1791 | switch (action) { |
| 1792 | case CPU_UP_PREPARE: |
Zhenzhong Duan | 90d4f55 | 2011-10-27 22:28:59 -0700 | [diff] [blame] | 1793 | xen_vcpu_setup(cpu); |
Konrad Rzeszutek Wilk | 7918c92 | 2013-04-16 15:18:00 -0400 | [diff] [blame] | 1794 | if (xen_have_vector_callback) { |
Konrad Rzeszutek Wilk | 7918c92 | 2013-04-16 15:18:00 -0400 | [diff] [blame] | 1795 | if (xen_feature(XENFEAT_hvm_safe_pvclock)) |
| 1796 | xen_setup_timer(cpu); |
| 1797 | } |
Sheng Yang | 38e20b0 | 2010-05-14 12:40:51 +0100 | [diff] [blame] | 1798 | break; |
| 1799 | default: |
| 1800 | break; |
| 1801 | } |
| 1802 | return NOTIFY_OK; |
| 1803 | } |
| 1804 | |
Paul Gortmaker | 148f9bb | 2013-06-18 18:23:59 -0400 | [diff] [blame] | 1805 | static struct notifier_block xen_hvm_cpu_notifier = { |
Sheng Yang | 38e20b0 | 2010-05-14 12:40:51 +0100 | [diff] [blame] | 1806 | .notifier_call = xen_hvm_cpu_notify, |
| 1807 | }; |
| 1808 | |
Vitaly Kuznetsov | 0b34a16 | 2015-09-25 11:59:52 +0200 | [diff] [blame] | 1809 | #ifdef CONFIG_KEXEC_CORE |
| 1810 | static void xen_hvm_shutdown(void) |
| 1811 | { |
| 1812 | native_machine_shutdown(); |
| 1813 | if (kexec_in_progress) |
| 1814 | xen_reboot(SHUTDOWN_soft_reset); |
| 1815 | } |
| 1816 | |
| 1817 | static void xen_hvm_crash_shutdown(struct pt_regs *regs) |
| 1818 | { |
| 1819 | native_machine_crash_shutdown(regs); |
| 1820 | xen_reboot(SHUTDOWN_soft_reset); |
| 1821 | } |
| 1822 | #endif |
| 1823 | |
Sheng Yang | bee6ab5 | 2010-05-14 12:39:33 +0100 | [diff] [blame] | 1824 | static void __init xen_hvm_guest_init(void) |
| 1825 | { |
Boris Ostrovsky | a71dbda | 2015-05-04 11:02:15 -0400 | [diff] [blame] | 1826 | if (xen_pv_domain()) |
| 1827 | return; |
| 1828 | |
Olaf Hering | 4ff2d06 | 2012-07-17 11:59:15 +0200 | [diff] [blame] | 1829 | init_hvm_pv_info(); |
Sheng Yang | bee6ab5 | 2010-05-14 12:39:33 +0100 | [diff] [blame] | 1830 | |
Stefano Stabellini | 016b6f5 | 2010-05-14 12:45:07 +0100 | [diff] [blame] | 1831 | xen_hvm_init_shared_info(); |
Sheng Yang | 38e20b0 | 2010-05-14 12:40:51 +0100 | [diff] [blame] | 1832 | |
Vaughan Cao | 669b0ae | 2013-08-16 16:10:56 +0800 | [diff] [blame] | 1833 | xen_panic_handler_init(); |
| 1834 | |
Sheng Yang | 38e20b0 | 2010-05-14 12:40:51 +0100 | [diff] [blame] | 1835 | if (xen_feature(XENFEAT_hvm_callback_vector)) |
| 1836 | xen_have_vector_callback = 1; |
Stefano Stabellini | 99bbb3a | 2010-12-02 17:55:10 +0000 | [diff] [blame] | 1837 | xen_hvm_smp_init(); |
Sheng Yang | 38e20b0 | 2010-05-14 12:40:51 +0100 | [diff] [blame] | 1838 | register_cpu_notifier(&xen_hvm_cpu_notifier); |
Stefano Stabellini | c1c5413 | 2010-05-14 12:44:30 +0100 | [diff] [blame] | 1839 | xen_unplug_emulated_devices(); |
Sheng Yang | 38e20b0 | 2010-05-14 12:40:51 +0100 | [diff] [blame] | 1840 | x86_init.irqs.intr_init = xen_init_IRQ; |
Stefano Stabellini | 409771d | 2010-05-14 12:48:19 +0100 | [diff] [blame] | 1841 | xen_hvm_init_time_ops(); |
Stefano Stabellini | 5915100 | 2010-06-17 14:22:52 +0100 | [diff] [blame] | 1842 | xen_hvm_init_mmu_ops(); |
Vitaly Kuznetsov | 0b34a16 | 2015-09-25 11:59:52 +0200 | [diff] [blame] | 1843 | #ifdef CONFIG_KEXEC_CORE |
| 1844 | machine_ops.shutdown = xen_hvm_shutdown; |
| 1845 | machine_ops.crash_shutdown = xen_hvm_crash_shutdown; |
| 1846 | #endif |
Sheng Yang | bee6ab5 | 2010-05-14 12:39:33 +0100 | [diff] [blame] | 1847 | } |
Boris Ostrovsky | a71dbda | 2015-05-04 11:02:15 -0400 | [diff] [blame] | 1848 | #endif |
Sheng Yang | bee6ab5 | 2010-05-14 12:39:33 +0100 | [diff] [blame] | 1849 | |
Konrad Rzeszutek Wilk | 8d693b9 | 2014-07-11 11:51:35 -0400 | [diff] [blame] | 1850 | static bool xen_nopv = false; |
| 1851 | static __init int xen_parse_nopv(char *arg) |
| 1852 | { |
| 1853 | xen_nopv = true; |
| 1854 | return 0; |
| 1855 | } |
| 1856 | early_param("xen_nopv", xen_parse_nopv); |
| 1857 | |
Boris Ostrovsky | a71dbda | 2015-05-04 11:02:15 -0400 | [diff] [blame] | 1858 | static uint32_t __init xen_platform(void) |
Sheng Yang | bee6ab5 | 2010-05-14 12:39:33 +0100 | [diff] [blame] | 1859 | { |
Konrad Rzeszutek Wilk | 8d693b9 | 2014-07-11 11:51:35 -0400 | [diff] [blame] | 1860 | if (xen_nopv) |
| 1861 | return 0; |
| 1862 | |
Jason Wang | 9df56f1 | 2013-07-25 16:54:35 +0800 | [diff] [blame] | 1863 | return xen_cpuid_base(); |
Sheng Yang | bee6ab5 | 2010-05-14 12:39:33 +0100 | [diff] [blame] | 1864 | } |
| 1865 | |
Sheng Yang | d9b8ca8 | 2010-12-21 14:18:49 +0800 | [diff] [blame] | 1866 | bool xen_hvm_need_lapic(void) |
| 1867 | { |
Konrad Rzeszutek Wilk | 8d693b9 | 2014-07-11 11:51:35 -0400 | [diff] [blame] | 1868 | if (xen_nopv) |
| 1869 | return false; |
Sheng Yang | d9b8ca8 | 2010-12-21 14:18:49 +0800 | [diff] [blame] | 1870 | if (xen_pv_domain()) |
| 1871 | return false; |
| 1872 | if (!xen_hvm_domain()) |
| 1873 | return false; |
| 1874 | if (xen_feature(XENFEAT_hvm_pirqs) && xen_have_vector_callback) |
| 1875 | return false; |
| 1876 | return true; |
| 1877 | } |
| 1878 | EXPORT_SYMBOL_GPL(xen_hvm_need_lapic); |
| 1879 | |
Boris Ostrovsky | a71dbda | 2015-05-04 11:02:15 -0400 | [diff] [blame] | 1880 | static void xen_set_cpu_features(struct cpuinfo_x86 *c) |
| 1881 | { |
Boris Ostrovsky | 91e2eea | 2015-11-19 16:55:45 -0500 | [diff] [blame] | 1882 | if (xen_pv_domain()) { |
Boris Ostrovsky | a71dbda | 2015-05-04 11:02:15 -0400 | [diff] [blame] | 1883 | clear_cpu_bug(c, X86_BUG_SYSRET_SS_ATTRS); |
Boris Ostrovsky | 91e2eea | 2015-11-19 16:55:45 -0500 | [diff] [blame] | 1884 | set_cpu_cap(c, X86_FEATURE_XENPV); |
| 1885 | } |
Boris Ostrovsky | a71dbda | 2015-05-04 11:02:15 -0400 | [diff] [blame] | 1886 | } |
| 1887 | |
| 1888 | const struct hypervisor_x86 x86_hyper_xen = { |
| 1889 | .name = "Xen", |
| 1890 | .detect = xen_platform, |
| 1891 | #ifdef CONFIG_XEN_PVHVM |
Sheng Yang | bee6ab5 | 2010-05-14 12:39:33 +0100 | [diff] [blame] | 1892 | .init_platform = xen_hvm_guest_init, |
Stefano Stabellini | ca65f9f | 2010-07-29 14:37:48 +0100 | [diff] [blame] | 1893 | #endif |
Boris Ostrovsky | a71dbda | 2015-05-04 11:02:15 -0400 | [diff] [blame] | 1894 | .x2apic_available = xen_x2apic_para_available, |
| 1895 | .set_cpu_features = xen_set_cpu_features, |
| 1896 | }; |
| 1897 | EXPORT_SYMBOL(x86_hyper_xen); |
Stefano Stabellini | a314e3e | 2015-10-22 16:20:46 +0000 | [diff] [blame] | 1898 | |
| 1899 | #ifdef CONFIG_HOTPLUG_CPU |
| 1900 | void xen_arch_register_cpu(int num) |
| 1901 | { |
| 1902 | arch_register_cpu(num); |
| 1903 | } |
| 1904 | EXPORT_SYMBOL(xen_arch_register_cpu); |
| 1905 | |
| 1906 | void xen_arch_unregister_cpu(int num) |
| 1907 | { |
| 1908 | arch_unregister_cpu(num); |
| 1909 | } |
| 1910 | EXPORT_SYMBOL(xen_arch_unregister_cpu); |
| 1911 | #endif |