diff options
| -rw-r--r-- | drivers/kvm/kvm.h | 1 | ||||
| -rw-r--r-- | drivers/kvm/kvm_main.c | 177 | ||||
| -rw-r--r-- | drivers/kvm/x86.c | 175 |
3 files changed, 177 insertions, 176 deletions
diff --git a/drivers/kvm/kvm.h b/drivers/kvm/kvm.h index d030a82966f..ef2a6a8328e 100644 --- a/drivers/kvm/kvm.h +++ b/drivers/kvm/kvm.h @@ -591,6 +591,7 @@ int kvm_set_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 data); void fx_init(struct kvm_vcpu *vcpu); +void kvm_vcpu_block(struct kvm_vcpu *vcpu); void kvm_resched(struct kvm_vcpu *vcpu); void kvm_load_guest_fpu(struct kvm_vcpu *vcpu); void kvm_put_guest_fpu(struct kvm_vcpu *vcpu); diff --git a/drivers/kvm/kvm_main.c b/drivers/kvm/kvm_main.c index 58a5f399ad8..57573ebf02b 100644 --- a/drivers/kvm/kvm_main.c +++ b/drivers/kvm/kvm_main.c @@ -789,7 +789,7 @@ void mark_page_dirty(struct kvm *kvm, gfn_t gfn) /* * The vCPU has executed a HLT instruction with in-kernel mode enabled. */ -static void kvm_vcpu_block(struct kvm_vcpu *vcpu) +void kvm_vcpu_block(struct kvm_vcpu *vcpu) { DECLARE_WAITQUEUE(wait, current); @@ -812,144 +812,6 @@ static void kvm_vcpu_block(struct kvm_vcpu *vcpu) remove_wait_queue(&vcpu->wq, &wait); } -int kvm_emulate_halt(struct kvm_vcpu *vcpu) -{ - ++vcpu->stat.halt_exits; - if (irqchip_in_kernel(vcpu->kvm)) { - vcpu->mp_state = VCPU_MP_STATE_HALTED; - kvm_vcpu_block(vcpu); - if (vcpu->mp_state != VCPU_MP_STATE_RUNNABLE) - return -EINTR; - return 1; - } else { - vcpu->run->exit_reason = KVM_EXIT_HLT; - return 0; - } -} -EXPORT_SYMBOL_GPL(kvm_emulate_halt); - -int kvm_emulate_hypercall(struct kvm_vcpu *vcpu) -{ - unsigned long nr, a0, a1, a2, a3, ret; - - kvm_x86_ops->cache_regs(vcpu); - - nr = vcpu->regs[VCPU_REGS_RAX]; - a0 = vcpu->regs[VCPU_REGS_RBX]; - a1 = vcpu->regs[VCPU_REGS_RCX]; - a2 = vcpu->regs[VCPU_REGS_RDX]; - a3 = vcpu->regs[VCPU_REGS_RSI]; - - if (!is_long_mode(vcpu)) { - nr &= 0xFFFFFFFF; - a0 &= 0xFFFFFFFF; - a1 &= 0xFFFFFFFF; - a2 &= 0xFFFFFFFF; - a3 &= 0xFFFFFFFF; - } - - switch (nr) { - default: - ret = -KVM_ENOSYS; - break; - } - vcpu->regs[VCPU_REGS_RAX] = ret; - kvm_x86_ops->decache_regs(vcpu); - return 0; -} -EXPORT_SYMBOL_GPL(kvm_emulate_hypercall); - -int kvm_fix_hypercall(struct kvm_vcpu *vcpu) -{ - char instruction[3]; - int ret = 0; - - mutex_lock(&vcpu->kvm->lock); - - /* - * Blow out the MMU to ensure that no other VCPU has an active mapping - * to ensure that the updated hypercall appears atomically across all - * VCPUs. - */ - kvm_mmu_zap_all(vcpu->kvm); - - kvm_x86_ops->cache_regs(vcpu); - kvm_x86_ops->patch_hypercall(vcpu, instruction); - if (emulator_write_emulated(vcpu->rip, instruction, 3, vcpu) - != X86EMUL_CONTINUE) - ret = -EFAULT; - - mutex_unlock(&vcpu->kvm->lock); - - return ret; -} - -static u64 mk_cr_64(u64 curr_cr, u32 new_val) -{ - return (curr_cr & ~((1ULL << 32) - 1)) | new_val; -} - -void realmode_lgdt(struct kvm_vcpu *vcpu, u16 limit, unsigned long base) -{ - struct descriptor_table dt = { limit, base }; - - kvm_x86_ops->set_gdt(vcpu, &dt); -} - -void realmode_lidt(struct kvm_vcpu *vcpu, u16 limit, unsigned long base) -{ - struct descriptor_table dt = { limit, base }; - - kvm_x86_ops->set_idt(vcpu, &dt); -} - -void realmode_lmsw(struct kvm_vcpu *vcpu, unsigned long msw, - unsigned long *rflags) -{ - lmsw(vcpu, msw); - *rflags = kvm_x86_ops->get_rflags(vcpu); -} - -unsigned long realmode_get_cr(struct kvm_vcpu *vcpu, int cr) -{ - kvm_x86_ops->decache_cr4_guest_bits(vcpu); - switch (cr) { - case 0: - return vcpu->cr0; - case 2: - return vcpu->cr2; - case 3: - return vcpu->cr3; - case 4: - return vcpu->cr4; - default: - vcpu_printf(vcpu, "%s: unexpected cr %u\n", __FUNCTION__, cr); - return 0; - } -} - -void realmode_set_cr(struct kvm_vcpu *vcpu, int cr, unsigned long val, - unsigned long *rflags) -{ - switch (cr) { - case 0: - set_cr0(vcpu, mk_cr_64(vcpu->cr0, val)); - *rflags = kvm_x86_ops->get_rflags(vcpu); - break; - case 2: - vcpu->cr2 = val; - break; - case 3: - set_cr3(vcpu, val); - break; - case 4: - set_cr4(vcpu, mk_cr_64(vcpu->cr4, val)); - break; - default: - vcpu_printf(vcpu, "%s: unexpected cr %u\n", __FUNCTION__, cr); - } -} - void kvm_resched(struct kvm_vcpu *vcpu) { if (!need_resched()) @@ -958,43 +820,6 @@ void kvm_resched(struct kvm_vcpu *vcpu) } EXPORT_SYMBOL_GPL(kvm_resched); -void kvm_emulate_cpuid(struct kvm_vcpu *vcpu) -{ - int i; - u32 function; - struct kvm_cpuid_entry *e, *best; - - kvm_x86_ops->cache_regs(vcpu); - function = vcpu->regs[VCPU_REGS_RAX]; - vcpu->regs[VCPU_REGS_RAX] = 0; - vcpu->regs[VCPU_REGS_RBX] = 0; - vcpu->regs[VCPU_REGS_RCX] = 0; - vcpu->regs[VCPU_REGS_RDX] = 0; - best = NULL; - for (i = 0; i < vcpu->cpuid_nent; ++i) { - e = &vcpu->cpuid_entries[i]; - if (e->function == function) { - best = e; - break; - } - /* - * Both basic or both extended? - */ - if (((e->function ^ function) & 0x80000000) == 0) - if (!best || e->function > best->function) - best = e; - } - if (best) { - vcpu->regs[VCPU_REGS_RAX] = best->eax; - vcpu->regs[VCPU_REGS_RBX] = best->ebx; - vcpu->regs[VCPU_REGS_RCX] = best->ecx; - vcpu->regs[VCPU_REGS_RDX] = best->edx; - } - kvm_x86_ops->decache_regs(vcpu); - kvm_x86_ops->skip_emulated_instruction(vcpu); -} -EXPORT_SYMBOL_GPL(kvm_emulate_cpuid); - /* * Check if userspace requested an interrupt window, and that the * interrupt window is open. diff --git a/drivers/kvm/x86.c b/drivers/kvm/x86.c index c1f10e58f4d..2cf7ebab50f 100644 --- a/drivers/kvm/x86.c +++ b/drivers/kvm/x86.c @@ -1610,3 +1610,178 @@ __init void kvm_arch_init(void) { kvm_init_msr_list(); } + +int kvm_emulate_halt(struct kvm_vcpu *vcpu) +{ + ++vcpu->stat.halt_exits; + if (irqchip_in_kernel(vcpu->kvm)) { + vcpu->mp_state = VCPU_MP_STATE_HALTED; + kvm_vcpu_block(vcpu); + if (vcpu->mp_state != VCPU_MP_STATE_RUNNABLE) + return -EINTR; + return 1; + } else { + vcpu->run->exit_reason = KVM_EXIT_HLT; + return 0; + } +} +EXPORT_SYMBOL_GPL(kvm_emulate_halt); + +int kvm_emulate_hypercall(struct kvm_vcpu *vcpu) +{ + unsigned long nr, a0, a1, a2, a3, ret; + + kvm_x86_ops->cache_regs(vcpu); + + nr = vcpu->regs[VCPU_REGS_RAX]; + a0 = vcpu->regs[VCPU_REGS_RBX]; + a1 = vcpu->regs[VCPU_REGS_RCX]; + a2 = vcpu->regs[VCPU_REGS_RDX]; + a3 = vcpu->regs[VCPU_REGS_RSI]; + + if (!is_long_mode(vcpu)) { + nr &= 0xFFFFFFFF; + a0 &= 0xFFFFFFFF; + a1 &= 0xFFFFFFFF; + a2 &= 0xFFFFFFFF; + a3 &= 0xFFFFFFFF; + } + + switch (nr) { + default: + ret = -KVM_ENOSYS; + break; + } + vcpu->regs[VCPU_REGS_RAX] = ret; + kvm_x86_ops->decache_regs(vcpu); + return 0; +} +EXPORT_SYMBOL_GPL(kvm_emulate_hypercall); + +int kvm_fix_hypercall(struct kvm_vcpu *vcpu) +{ + char instruction[3]; + int ret = 0; + + mutex_lock(&vcpu->kvm->lock); + + /* + * Blow out the MMU to ensure that no other VCPU has an active mapping + * to ensure that the updated hypercall appears atomically across all + * VCPUs. + */ + kvm_mmu_zap_all(vcpu->kvm); + + kvm_x86_ops->cache_regs(vcpu); + kvm_x86_ops->patch_hypercall(vcpu, instruction); + if (emulator_write_emulated(vcpu->rip, instruction, 3, vcpu) + != X86EMUL_CONTINUE) + ret = -EFAULT; + + mutex_unlock(&vcpu->kvm->lock); + + return ret; +} + +static u64 mk_cr_64(u64 curr_cr, u32 new_val) +{ + return (curr_cr & ~((1ULL << 32) - 1)) | new_val; +} + +void realmode_lgdt(struct kvm_vcpu *vcpu, u16 limit, unsigned long base) +{ + struct descriptor_table dt = { limit, base }; + + kvm_x86_ops->set_gdt(vcpu, &dt); +} + +void realmode_lidt(struct kvm_vcpu *vcpu, u16 limit, unsigned long base) +{ + struct descriptor_table dt = { limit, base }; + + kvm_x86_ops->set_idt(vcpu, &dt); +} + +void realmode_lmsw(struct kvm_vcpu *vcpu, unsigned long msw, + unsigned long *rflags) +{ + lmsw(vcpu, msw); + *rflags = kvm_x86_ops->get_rflags(vcpu); +} + +unsigned long realmode_get_cr(struct kvm_vcpu *vcpu, int cr) +{ + kvm_x86_ops->decache_cr4_guest_bits(vcpu); + switch (cr) { + case 0: + return vcpu->cr0; + case 2: + return vcpu->cr2; + case 3: + return vcpu->cr3; + case 4: + return vcpu->cr4; + default: + vcpu_printf(vcpu, "%s: unexpected cr %u\n", __FUNCTION__, cr); + return 0; + } +} + +void realmode_set_cr(struct kvm_vcpu *vcpu, int cr, unsigned long val, + unsigned long *rflags) +{ + switch (cr) { + case 0: + set_cr0(vcpu, mk_cr_64(vcpu->cr0, val)); + *rflags = kvm_x86_ops->get_rflags(vcpu); + break; + case 2: + vcpu->cr2 = val; + break; + case 3: + set_cr3(vcpu, val); + break; + case 4: + set_cr4(vcpu, mk_cr_64(vcpu->cr4, val)); + break; + default: + vcpu_printf(vcpu, "%s: unexpected cr %u\n", __FUNCTION__, cr); + } +} + +void kvm_emulate_cpuid(struct kvm_vcpu *vcpu) +{ + int i; + u32 function; + struct kvm_cpuid_entry *e, *best; + + kvm_x86_ops->cache_regs(vcpu); + function = vcpu->regs[VCPU_REGS_RAX]; + vcpu->regs[VCPU_REGS_RAX] = 0; + vcpu->regs[VCPU_REGS_RBX] = 0; + vcpu->regs[VCPU_REGS_RCX] = 0; + vcpu->regs[VCPU_REGS_RDX] = 0; + best = NULL; + for (i = 0; i < vcpu->cpuid_nent; ++i) { + e = &vcpu->cpuid_entries[i]; + if (e->function == function) { + best = e; + break; + } + /* + * Both basic or both extended? + */ + if (((e->function ^ function) & 0x80000000) == 0) + if (!best || e->function > best->function) + best = e; + } + if (best) { + vcpu->regs[VCPU_REGS_RAX] = best->eax; + vcpu->regs[VCPU_REGS_RBX] = best->ebx; + vcpu->regs[VCPU_REGS_RCX] = best->ecx; + vcpu->regs[VCPU_REGS_RDX] = best->edx; + } + kvm_x86_ops->decache_regs(vcpu); + kvm_x86_ops->skip_emulated_instruction(vcpu); +} +EXPORT_SYMBOL_GPL(kvm_emulate_cpuid); |