| /* |
| * Copyright (C) 2012,2013 - ARM Ltd |
| * Author: Marc Zyngier <marc.zyngier@arm.com> |
| * |
| * Derived from arch/arm/kvm/guest.c: |
| * Copyright (C) 2012 - Virtual Open Systems and Columbia University |
| * Author: Christoffer Dall <c.dall@virtualopensystems.com> |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License version 2 as |
| * published by the Free Software Foundation. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with this program. If not, see <http://www.gnu.org/licenses/>. |
| */ |
| |
| #include <linux/errno.h> |
| #include <linux/err.h> |
| #include <linux/kvm_host.h> |
| #include <linux/module.h> |
| #include <linux/vmalloc.h> |
| #include <linux/fs.h> |
| #include <asm/cputype.h> |
| #include <asm/uaccess.h> |
| #include <asm/kvm.h> |
| #include <asm/kvm_asm.h> |
| #include <asm/kvm_emulate.h> |
| #include <asm/kvm_coproc.h> |
| |
| struct kvm_stats_debugfs_item debugfs_entries[] = { |
| { NULL } |
| }; |
| |
| int kvm_arch_vcpu_setup(struct kvm_vcpu *vcpu) |
| { |
| vcpu->arch.hcr_el2 = HCR_GUEST_FLAGS; |
| return 0; |
| } |
| |
| static u64 core_reg_offset_from_id(u64 id) |
| { |
| return id & ~(KVM_REG_ARCH_MASK | KVM_REG_SIZE_MASK | KVM_REG_ARM_CORE); |
| } |
| |
| static int get_core_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg) |
| { |
| /* |
| * Because the kvm_regs structure is a mix of 32, 64 and |
| * 128bit fields, we index it as if it was a 32bit |
| * array. Hence below, nr_regs is the number of entries, and |
| * off the index in the "array". |
| */ |
| __u32 __user *uaddr = (__u32 __user *)(unsigned long)reg->addr; |
| struct kvm_regs *regs = vcpu_gp_regs(vcpu); |
| int nr_regs = sizeof(*regs) / sizeof(__u32); |
| u32 off; |
| |
| /* Our ID is an index into the kvm_regs struct. */ |
| off = core_reg_offset_from_id(reg->id); |
| if (off >= nr_regs || |
| (off + (KVM_REG_SIZE(reg->id) / sizeof(__u32))) >= nr_regs) |
| return -ENOENT; |
| |
| if (copy_to_user(uaddr, ((u32 *)regs) + off, KVM_REG_SIZE(reg->id))) |
| return -EFAULT; |
| |
| return 0; |
| } |
| |
| static int set_core_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg) |
| { |
| __u32 __user *uaddr = (__u32 __user *)(unsigned long)reg->addr; |
| struct kvm_regs *regs = vcpu_gp_regs(vcpu); |
| int nr_regs = sizeof(*regs) / sizeof(__u32); |
| __uint128_t tmp; |
| void *valp = &tmp; |
| u64 off; |
| int err = 0; |
| |
| /* Our ID is an index into the kvm_regs struct. */ |
| off = core_reg_offset_from_id(reg->id); |
| if (off >= nr_regs || |
| (off + (KVM_REG_SIZE(reg->id) / sizeof(__u32))) >= nr_regs) |
| return -ENOENT; |
| |
| if (KVM_REG_SIZE(reg->id) > sizeof(tmp)) |
| return -EINVAL; |
| |
| if (copy_from_user(valp, uaddr, KVM_REG_SIZE(reg->id))) { |
| err = -EFAULT; |
| goto out; |
| } |
| |
| if (off == KVM_REG_ARM_CORE_REG(regs.pstate)) { |
| u32 mode = (*(u32 *)valp) & COMPAT_PSR_MODE_MASK; |
| switch (mode) { |
| case COMPAT_PSR_MODE_USR: |
| case COMPAT_PSR_MODE_FIQ: |
| case COMPAT_PSR_MODE_IRQ: |
| case COMPAT_PSR_MODE_SVC: |
| case COMPAT_PSR_MODE_ABT: |
| case COMPAT_PSR_MODE_UND: |
| case PSR_MODE_EL0t: |
| case PSR_MODE_EL1t: |
| case PSR_MODE_EL1h: |
| break; |
| default: |
| err = -EINVAL; |
| goto out; |
| } |
| } |
| |
| memcpy((u32 *)regs + off, valp, KVM_REG_SIZE(reg->id)); |
| out: |
| return err; |
| } |
| |
| int kvm_arch_vcpu_ioctl_get_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs) |
| { |
| return -EINVAL; |
| } |
| |
| int kvm_arch_vcpu_ioctl_set_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs) |
| { |
| return -EINVAL; |
| } |
| |
| static unsigned long num_core_regs(void) |
| { |
| return sizeof(struct kvm_regs) / sizeof(__u32); |
| } |
| |
| /** |
| * ARM64 versions of the TIMER registers, always available on arm64 |
| */ |
| |
| #define NUM_TIMER_REGS 3 |
| |
| static bool is_timer_reg(u64 index) |
| { |
| switch (index) { |
| case KVM_REG_ARM_TIMER_CTL: |
| case KVM_REG_ARM_TIMER_CNT: |
| case KVM_REG_ARM_TIMER_CVAL: |
| return true; |
| } |
| return false; |
| } |
| |
| static int copy_timer_indices(struct kvm_vcpu *vcpu, u64 __user *uindices) |
| { |
| if (put_user(KVM_REG_ARM_TIMER_CTL, uindices)) |
| return -EFAULT; |
| uindices++; |
| if (put_user(KVM_REG_ARM_TIMER_CNT, uindices)) |
| return -EFAULT; |
| uindices++; |
| if (put_user(KVM_REG_ARM_TIMER_CVAL, uindices)) |
| return -EFAULT; |
| |
| return 0; |
| } |
| |
| static int set_timer_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg) |
| { |
| void __user *uaddr = (void __user *)(long)reg->addr; |
| u64 val; |
| int ret; |
| |
| ret = copy_from_user(&val, uaddr, KVM_REG_SIZE(reg->id)); |
| if (ret != 0) |
| return ret; |
| |
| return kvm_arm_timer_set_reg(vcpu, reg->id, val); |
| } |
| |
| static int get_timer_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg) |
| { |
| void __user *uaddr = (void __user *)(long)reg->addr; |
| u64 val; |
| |
| val = kvm_arm_timer_get_reg(vcpu, reg->id); |
| return copy_to_user(uaddr, &val, KVM_REG_SIZE(reg->id)); |
| } |
| |
| /** |
| * kvm_arm_num_regs - how many registers do we present via KVM_GET_ONE_REG |
| * |
| * This is for all registers. |
| */ |
| unsigned long kvm_arm_num_regs(struct kvm_vcpu *vcpu) |
| { |
| return num_core_regs() + kvm_arm_num_sys_reg_descs(vcpu) |
| + NUM_TIMER_REGS; |
| } |
| |
| /** |
| * kvm_arm_copy_reg_indices - get indices of all registers. |
| * |
| * We do core registers right here, then we apppend system regs. |
| */ |
| int kvm_arm_copy_reg_indices(struct kvm_vcpu *vcpu, u64 __user *uindices) |
| { |
| unsigned int i; |
| const u64 core_reg = KVM_REG_ARM64 | KVM_REG_SIZE_U64 | KVM_REG_ARM_CORE; |
| int ret; |
| |
| for (i = 0; i < sizeof(struct kvm_regs) / sizeof(__u32); i++) { |
| if (put_user(core_reg | i, uindices)) |
| return -EFAULT; |
| uindices++; |
| } |
| |
| ret = copy_timer_indices(vcpu, uindices); |
| if (ret) |
| return ret; |
| uindices += NUM_TIMER_REGS; |
| |
| return kvm_arm_copy_sys_reg_indices(vcpu, uindices); |
| } |
| |
| int kvm_arm_get_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg) |
| { |
| /* We currently use nothing arch-specific in upper 32 bits */ |
| if ((reg->id & ~KVM_REG_SIZE_MASK) >> 32 != KVM_REG_ARM64 >> 32) |
| return -EINVAL; |
| |
| /* Register group 16 means we want a core register. */ |
| if ((reg->id & KVM_REG_ARM_COPROC_MASK) == KVM_REG_ARM_CORE) |
| return get_core_reg(vcpu, reg); |
| |
| if (is_timer_reg(reg->id)) |
| return get_timer_reg(vcpu, reg); |
| |
| return kvm_arm_sys_reg_get_reg(vcpu, reg); |
| } |
| |
| int kvm_arm_set_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg) |
| { |
| /* We currently use nothing arch-specific in upper 32 bits */ |
| if ((reg->id & ~KVM_REG_SIZE_MASK) >> 32 != KVM_REG_ARM64 >> 32) |
| return -EINVAL; |
| |
| /* Register group 16 means we set a core register. */ |
| if ((reg->id & KVM_REG_ARM_COPROC_MASK) == KVM_REG_ARM_CORE) |
| return set_core_reg(vcpu, reg); |
| |
| if (is_timer_reg(reg->id)) |
| return set_timer_reg(vcpu, reg); |
| |
| return kvm_arm_sys_reg_set_reg(vcpu, reg); |
| } |
| |
| int kvm_arch_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu, |
| struct kvm_sregs *sregs) |
| { |
| return -EINVAL; |
| } |
| |
| int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu, |
| struct kvm_sregs *sregs) |
| { |
| return -EINVAL; |
| } |
| |
| int __attribute_const__ kvm_target_cpu(void) |
| { |
| unsigned long implementor = read_cpuid_implementor(); |
| unsigned long part_number = read_cpuid_part_number(); |
| |
| switch (implementor) { |
| case ARM_CPU_IMP_ARM: |
| switch (part_number) { |
| case ARM_CPU_PART_AEM_V8: |
| return KVM_ARM_TARGET_AEM_V8; |
| case ARM_CPU_PART_FOUNDATION: |
| return KVM_ARM_TARGET_FOUNDATION_V8; |
| case ARM_CPU_PART_CORTEX_A53: |
| return KVM_ARM_TARGET_CORTEX_A53; |
| case ARM_CPU_PART_CORTEX_A57: |
| return KVM_ARM_TARGET_CORTEX_A57; |
| }; |
| break; |
| case ARM_CPU_IMP_APM: |
| switch (part_number) { |
| case APM_CPU_PART_POTENZA: |
| return KVM_ARM_TARGET_XGENE_POTENZA; |
| }; |
| break; |
| }; |
| |
| return -EINVAL; |
| } |
| |
| int kvm_vcpu_set_target(struct kvm_vcpu *vcpu, |
| const struct kvm_vcpu_init *init) |
| { |
| unsigned int i; |
| int phys_target = kvm_target_cpu(); |
| |
| if (init->target != phys_target) |
| return -EINVAL; |
| |
| vcpu->arch.target = phys_target; |
| bitmap_zero(vcpu->arch.features, KVM_VCPU_MAX_FEATURES); |
| |
| /* -ENOENT for unknown features, -EINVAL for invalid combinations. */ |
| for (i = 0; i < sizeof(init->features) * 8; i++) { |
| if (init->features[i / 32] & (1 << (i % 32))) { |
| if (i >= KVM_VCPU_MAX_FEATURES) |
| return -ENOENT; |
| set_bit(i, vcpu->arch.features); |
| } |
| } |
| |
| /* Now we know what it is, we can reset it. */ |
| return kvm_reset_vcpu(vcpu); |
| } |
| |
| int kvm_vcpu_preferred_target(struct kvm_vcpu_init *init) |
| { |
| int target = kvm_target_cpu(); |
| |
| if (target < 0) |
| return -ENODEV; |
| |
| memset(init, 0, sizeof(*init)); |
| |
| /* |
| * For now, we don't return any features. |
| * In future, we might use features to return target |
| * specific features available for the preferred |
| * target type. |
| */ |
| init->target = (__u32)target; |
| |
| return 0; |
| } |
| |
| int kvm_arch_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu) |
| { |
| return -EINVAL; |
| } |
| |
| int kvm_arch_vcpu_ioctl_set_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu) |
| { |
| return -EINVAL; |
| } |
| |
| int kvm_arch_vcpu_ioctl_translate(struct kvm_vcpu *vcpu, |
| struct kvm_translation *tr) |
| { |
| return -EINVAL; |
| } |