KVM: Portability: Move control register helper functions to x86.c
This patch moves the definitions of CR0_RESERVED_BITS,
CR4_RESERVED_BITS, and CR8_RESERVED_BITS along with the following
functions from kvm_main.c to x86.c:
set_cr0(), set_cr3(), set_cr4(), set_cr8(), get_cr8(), lmsw(),
load_pdptrs()
The static function wrapper inject_gp is duplicated in kvm_main.c and
x86.c for now, the version in kvm_main.c should disappear once the last
user of it is gone too.
The function load_pdptrs is no longer static, and now defined in x86.h
for the time being, until the last user of it is gone from kvm_main.c.
Signed-off-by: Carsten Otte <cotte@de.ibm.com>
Reviewed-by: Christian Borntraeger <borntraeger@de.ibm.com>
Acked-by: Hollis Blanchard <hollisb@us.ibm.com>
Signed-off-by: Avi Kivity <avi@qumranet.com>
diff --git a/drivers/kvm/x86.c b/drivers/kvm/x86.c
index c26e371..a728af8 100644
--- a/drivers/kvm/x86.c
+++ b/drivers/kvm/x86.c
@@ -27,6 +27,17 @@
#include <asm/uaccess.h>
#define MAX_IO_MSRS 256
+#define CR0_RESERVED_BITS \
+ (~(unsigned long)(X86_CR0_PE | X86_CR0_MP | X86_CR0_EM | X86_CR0_TS \
+ | X86_CR0_ET | X86_CR0_NE | X86_CR0_WP | X86_CR0_AM \
+ | X86_CR0_NW | X86_CR0_CD | X86_CR0_PG))
+#define CR4_RESERVED_BITS \
+ (~(unsigned long)(X86_CR4_VME | X86_CR4_PVI | X86_CR4_TSD | X86_CR4_DE\
+ | X86_CR4_PSE | X86_CR4_PAE | X86_CR4_MCE \
+ | X86_CR4_PGE | X86_CR4_PCE | X86_CR4_OSFXSR \
+ | X86_CR4_OSXMMEXCPT | X86_CR4_VMXE))
+
+#define CR8_RESERVED_BITS (~(unsigned long)X86_CR8_TPR)
unsigned long segment_base(u16 selector)
{
@@ -78,6 +89,219 @@
}
EXPORT_SYMBOL_GPL(kvm_set_apic_base);
+static void inject_gp(struct kvm_vcpu *vcpu)
+{
+ kvm_x86_ops->inject_gp(vcpu, 0);
+}
+
+/*
+ * Load the pae pdptrs. Return true is they are all valid.
+ */
+int load_pdptrs(struct kvm_vcpu *vcpu, unsigned long cr3)
+{
+ gfn_t pdpt_gfn = cr3 >> PAGE_SHIFT;
+ unsigned offset = ((cr3 & (PAGE_SIZE-1)) >> 5) << 2;
+ int i;
+ int ret;
+ u64 pdpte[ARRAY_SIZE(vcpu->pdptrs)];
+
+ mutex_lock(&vcpu->kvm->lock);
+ ret = kvm_read_guest_page(vcpu->kvm, pdpt_gfn, pdpte,
+ offset * sizeof(u64), sizeof(pdpte));
+ if (ret < 0) {
+ ret = 0;
+ goto out;
+ }
+ for (i = 0; i < ARRAY_SIZE(pdpte); ++i) {
+ if ((pdpte[i] & 1) && (pdpte[i] & 0xfffffff0000001e6ull)) {
+ ret = 0;
+ goto out;
+ }
+ }
+ ret = 1;
+
+ memcpy(vcpu->pdptrs, pdpte, sizeof(vcpu->pdptrs));
+out:
+ mutex_unlock(&vcpu->kvm->lock);
+
+ return ret;
+}
+
+void set_cr0(struct kvm_vcpu *vcpu, unsigned long cr0)
+{
+ if (cr0 & CR0_RESERVED_BITS) {
+ printk(KERN_DEBUG "set_cr0: 0x%lx #GP, reserved bits 0x%lx\n",
+ cr0, vcpu->cr0);
+ inject_gp(vcpu);
+ return;
+ }
+
+ if ((cr0 & X86_CR0_NW) && !(cr0 & X86_CR0_CD)) {
+ printk(KERN_DEBUG "set_cr0: #GP, CD == 0 && NW == 1\n");
+ inject_gp(vcpu);
+ return;
+ }
+
+ if ((cr0 & X86_CR0_PG) && !(cr0 & X86_CR0_PE)) {
+ printk(KERN_DEBUG "set_cr0: #GP, set PG flag "
+ "and a clear PE flag\n");
+ inject_gp(vcpu);
+ return;
+ }
+
+ if (!is_paging(vcpu) && (cr0 & X86_CR0_PG)) {
+#ifdef CONFIG_X86_64
+ if ((vcpu->shadow_efer & EFER_LME)) {
+ int cs_db, cs_l;
+
+ if (!is_pae(vcpu)) {
+ printk(KERN_DEBUG "set_cr0: #GP, start paging "
+ "in long mode while PAE is disabled\n");
+ inject_gp(vcpu);
+ return;
+ }
+ kvm_x86_ops->get_cs_db_l_bits(vcpu, &cs_db, &cs_l);
+ if (cs_l) {
+ printk(KERN_DEBUG "set_cr0: #GP, start paging "
+ "in long mode while CS.L == 1\n");
+ inject_gp(vcpu);
+ return;
+
+ }
+ } else
+#endif
+ if (is_pae(vcpu) && !load_pdptrs(vcpu, vcpu->cr3)) {
+ printk(KERN_DEBUG "set_cr0: #GP, pdptrs "
+ "reserved bits\n");
+ inject_gp(vcpu);
+ return;
+ }
+
+ }
+
+ kvm_x86_ops->set_cr0(vcpu, cr0);
+ vcpu->cr0 = cr0;
+
+ mutex_lock(&vcpu->kvm->lock);
+ kvm_mmu_reset_context(vcpu);
+ mutex_unlock(&vcpu->kvm->lock);
+ return;
+}
+EXPORT_SYMBOL_GPL(set_cr0);
+
+void lmsw(struct kvm_vcpu *vcpu, unsigned long msw)
+{
+ set_cr0(vcpu, (vcpu->cr0 & ~0x0ful) | (msw & 0x0f));
+}
+EXPORT_SYMBOL_GPL(lmsw);
+
+void set_cr4(struct kvm_vcpu *vcpu, unsigned long cr4)
+{
+ if (cr4 & CR4_RESERVED_BITS) {
+ printk(KERN_DEBUG "set_cr4: #GP, reserved bits\n");
+ inject_gp(vcpu);
+ return;
+ }
+
+ if (is_long_mode(vcpu)) {
+ if (!(cr4 & X86_CR4_PAE)) {
+ printk(KERN_DEBUG "set_cr4: #GP, clearing PAE while "
+ "in long mode\n");
+ inject_gp(vcpu);
+ return;
+ }
+ } else if (is_paging(vcpu) && !is_pae(vcpu) && (cr4 & X86_CR4_PAE)
+ && !load_pdptrs(vcpu, vcpu->cr3)) {
+ printk(KERN_DEBUG "set_cr4: #GP, pdptrs reserved bits\n");
+ inject_gp(vcpu);
+ return;
+ }
+
+ if (cr4 & X86_CR4_VMXE) {
+ printk(KERN_DEBUG "set_cr4: #GP, setting VMXE\n");
+ inject_gp(vcpu);
+ return;
+ }
+ kvm_x86_ops->set_cr4(vcpu, cr4);
+ vcpu->cr4 = cr4;
+ mutex_lock(&vcpu->kvm->lock);
+ kvm_mmu_reset_context(vcpu);
+ mutex_unlock(&vcpu->kvm->lock);
+}
+EXPORT_SYMBOL_GPL(set_cr4);
+
+void set_cr3(struct kvm_vcpu *vcpu, unsigned long cr3)
+{
+ if (is_long_mode(vcpu)) {
+ if (cr3 & CR3_L_MODE_RESERVED_BITS) {
+ printk(KERN_DEBUG "set_cr3: #GP, reserved bits\n");
+ inject_gp(vcpu);
+ return;
+ }
+ } else {
+ if (is_pae(vcpu)) {
+ if (cr3 & CR3_PAE_RESERVED_BITS) {
+ printk(KERN_DEBUG
+ "set_cr3: #GP, reserved bits\n");
+ inject_gp(vcpu);
+ return;
+ }
+ if (is_paging(vcpu) && !load_pdptrs(vcpu, cr3)) {
+ printk(KERN_DEBUG "set_cr3: #GP, pdptrs "
+ "reserved bits\n");
+ inject_gp(vcpu);
+ return;
+ }
+ }
+ /*
+ * We don't check reserved bits in nonpae mode, because
+ * this isn't enforced, and VMware depends on this.
+ */
+ }
+
+ mutex_lock(&vcpu->kvm->lock);
+ /*
+ * Does the new cr3 value map to physical memory? (Note, we
+ * catch an invalid cr3 even in real-mode, because it would
+ * cause trouble later on when we turn on paging anyway.)
+ *
+ * A real CPU would silently accept an invalid cr3 and would
+ * attempt to use it - with largely undefined (and often hard
+ * to debug) behavior on the guest side.
+ */
+ if (unlikely(!gfn_to_memslot(vcpu->kvm, cr3 >> PAGE_SHIFT)))
+ inject_gp(vcpu);
+ else {
+ vcpu->cr3 = cr3;
+ vcpu->mmu.new_cr3(vcpu);
+ }
+ mutex_unlock(&vcpu->kvm->lock);
+}
+EXPORT_SYMBOL_GPL(set_cr3);
+
+void set_cr8(struct kvm_vcpu *vcpu, unsigned long cr8)
+{
+ if (cr8 & CR8_RESERVED_BITS) {
+ printk(KERN_DEBUG "set_cr8: #GP, reserved bits 0x%lx\n", cr8);
+ inject_gp(vcpu);
+ return;
+ }
+ if (irqchip_in_kernel(vcpu->kvm))
+ kvm_lapic_set_tpr(vcpu, cr8);
+ else
+ vcpu->cr8 = cr8;
+}
+EXPORT_SYMBOL_GPL(set_cr8);
+
+unsigned long get_cr8(struct kvm_vcpu *vcpu)
+{
+ if (irqchip_in_kernel(vcpu->kvm))
+ return kvm_lapic_get_cr8(vcpu);
+ else
+ return vcpu->cr8;
+}
+EXPORT_SYMBOL_GPL(get_cr8);
+
/*
* List of msr numbers which we expose to userspace through KVM_GET_MSRS
* and KVM_SET_MSRS, and KVM_GET_MSR_INDEX_LIST.