From a633e41e736279c6d3174f52deeb9b8b5fa85e13 Mon Sep 17 00:00:00 2001 From: Sean Christopherson Date: Wed, 26 Sep 2018 09:23:47 -0700 Subject: [PATCH] KVM: nVMX: assimilate nested_vmx_entry_failure() into nested_vmx_enter_non_root_mode() Handling all VMExits due to failed consistency checks on VMEnter in nested_vmx_enter_non_root_mode() consolidates all relevant code into a single location, and removing nested_vmx_entry_failure() eliminates a confusing function name and label. For a VMEntry, "fail" and its derivatives has a very specific meaning due to the different behavior of a VMEnter VMFail versus VMExit, i.e. it wasn't obvious that nested_vmx_entry_failure() handled VMExit scenarios. Signed-off-by: Sean Christopherson Reviewed-by: Jim Mattson Signed-off-by: Paolo Bonzini --- arch/x86/kvm/vmx.c | 78 +++++++++++++++++++++------------------------- 1 file changed, 36 insertions(+), 42 deletions(-) diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c index 9326f6ab8a36..7906dd4899e7 100644 --- a/arch/x86/kvm/vmx.c +++ b/arch/x86/kvm/vmx.c @@ -2048,9 +2048,6 @@ static inline bool is_nmi(u32 intr_info) static void nested_vmx_vmexit(struct kvm_vcpu *vcpu, u32 exit_reason, u32 exit_intr_info, unsigned long exit_qualification); -static void nested_vmx_entry_failure(struct kvm_vcpu *vcpu, - struct vmcs12 *vmcs12, - u32 reason, unsigned long qualification); static int __find_msr_index(struct vcpu_vmx *vmx, u32 msr) { @@ -12640,26 +12637,29 @@ static int check_vmentry_postreqs(struct kvm_vcpu *vcpu, struct vmcs12 *vmcs12, return 0; } +static void load_vmcs12_host_state(struct kvm_vcpu *vcpu, + struct vmcs12 *vmcs12); + /* - * If exit_qual is NULL, this is being called from state restore (either RSM + * If from_vmentry is false, this is being called from state restore (either RSM * or KVM_SET_NESTED_STATE). Otherwise it's called from vmlaunch/vmresume. */ -static int nested_vmx_enter_non_root_mode(struct kvm_vcpu *vcpu, u32 *exit_qual) +static int nested_vmx_enter_non_root_mode(struct kvm_vcpu *vcpu, + bool from_vmentry) { struct vcpu_vmx *vmx = to_vmx(vcpu); struct vmcs12 *vmcs12 = get_vmcs12(vcpu); - bool from_vmentry = !!exit_qual; - u32 dummy_exit_qual; bool evaluate_pending_interrupts; - int r = 0; + u32 exit_reason = EXIT_REASON_INVALID_STATE; + u32 exit_qual; evaluate_pending_interrupts = vmcs_read32(CPU_BASED_VM_EXEC_CONTROL) & (CPU_BASED_VIRTUAL_INTR_PENDING | CPU_BASED_VIRTUAL_NMI_PENDING); if (likely(!evaluate_pending_interrupts) && kvm_vcpu_apicv_active(vcpu)) evaluate_pending_interrupts |= vmx_has_apicv_interrupt(vcpu); - if (from_vmentry && check_vmentry_postreqs(vcpu, vmcs12, exit_qual)) - return EXIT_REASON_INVALID_STATE; + if (from_vmentry && check_vmentry_postreqs(vcpu, vmcs12, &exit_qual)) + goto vmentry_fail_vmexit; enter_guest_mode(vcpu); @@ -12674,18 +12674,17 @@ static int nested_vmx_enter_non_root_mode(struct kvm_vcpu *vcpu, u32 *exit_qual) if (vmcs12->cpu_based_vm_exec_control & CPU_BASED_USE_TSC_OFFSETING) vcpu->arch.tsc_offset += vmcs12->tsc_offset; - r = EXIT_REASON_INVALID_STATE; - if (prepare_vmcs02(vcpu, vmcs12, from_vmentry ? exit_qual : &dummy_exit_qual)) + if (prepare_vmcs02(vcpu, vmcs12, &exit_qual)) goto fail; if (from_vmentry) { nested_get_vmcs12_pages(vcpu); - r = EXIT_REASON_MSR_LOAD_FAIL; - *exit_qual = nested_vmx_load_msr(vcpu, - vmcs12->vm_entry_msr_load_addr, - vmcs12->vm_entry_msr_load_count); - if (*exit_qual) + exit_reason = EXIT_REASON_MSR_LOAD_FAIL; + exit_qual = nested_vmx_load_msr(vcpu, + vmcs12->vm_entry_msr_load_addr, + vmcs12->vm_entry_msr_load_count); + if (exit_qual) goto fail; } else { /* @@ -12723,12 +12722,28 @@ static int nested_vmx_enter_non_root_mode(struct kvm_vcpu *vcpu, u32 *exit_qual) */ return 0; + /* + * A failed consistency check that leads to a VMExit during L1's + * VMEnter to L2 is a variation of a normal VMexit, as explained in + * 26.7 "VM-entry failures during or after loading guest state". + */ fail: if (vmcs12->cpu_based_vm_exec_control & CPU_BASED_USE_TSC_OFFSETING) vcpu->arch.tsc_offset -= vmcs12->tsc_offset; leave_guest_mode(vcpu); vmx_switch_vmcs(vcpu, &vmx->vmcs01); - return r; + + if (!from_vmentry) + return 1; + +vmentry_fail_vmexit: + load_vmcs12_host_state(vcpu, vmcs12); + vmcs12->vm_exit_reason = exit_reason | VMX_EXIT_REASONS_FAILED_VMENTRY; + vmcs12->exit_qualification = exit_qual; + nested_vmx_succeed(vcpu); + if (enable_shadow_vmcs) + vmx->nested.sync_shadow_vmcs = true; + return 1; } /* @@ -12740,7 +12755,6 @@ static int nested_vmx_run(struct kvm_vcpu *vcpu, bool launch) struct vmcs12 *vmcs12; struct vcpu_vmx *vmx = to_vmx(vcpu); u32 interrupt_shadow = vmx_get_interrupt_shadow(vcpu); - u32 exit_qual; int ret; if (!nested_vmx_check_permission(vcpu)) @@ -12809,9 +12823,8 @@ static int nested_vmx_run(struct kvm_vcpu *vcpu, bool launch) */ vmx->nested.nested_run_pending = 1; - ret = nested_vmx_enter_non_root_mode(vcpu, &exit_qual); + ret = nested_vmx_enter_non_root_mode(vcpu, true); if (ret) { - nested_vmx_entry_failure(vcpu, vmcs12, ret, exit_qual); vmx->nested.nested_run_pending = 0; return 1; } @@ -13609,25 +13622,6 @@ static void vmx_leave_nested(struct kvm_vcpu *vcpu) free_nested(to_vmx(vcpu)); } -/* - * L1's failure to enter L2 is a subset of a normal exit, as explained in - * 23.7 "VM-entry failures during or after loading guest state" (this also - * lists the acceptable exit-reason and exit-qualification parameters). - * It should only be called before L2 actually succeeded to run, and when - * vmcs01 is current (it doesn't leave_guest_mode() or switch vmcss). - */ -static void nested_vmx_entry_failure(struct kvm_vcpu *vcpu, - struct vmcs12 *vmcs12, - u32 reason, unsigned long qualification) -{ - load_vmcs12_host_state(vcpu, vmcs12); - vmcs12->vm_exit_reason = reason | VMX_EXIT_REASONS_FAILED_VMENTRY; - vmcs12->exit_qualification = qualification; - nested_vmx_succeed(vcpu); - if (enable_shadow_vmcs) - to_vmx(vcpu)->nested.sync_shadow_vmcs = true; -} - static int vmx_check_intercept(struct kvm_vcpu *vcpu, struct x86_instruction_info *info, enum x86_intercept_stage stage) @@ -14051,7 +14045,7 @@ static int vmx_pre_leave_smm(struct kvm_vcpu *vcpu, u64 smbase) if (vmx->nested.smm.guest_mode) { vcpu->arch.hflags &= ~HF_SMM_MASK; - ret = nested_vmx_enter_non_root_mode(vcpu, NULL); + ret = nested_vmx_enter_non_root_mode(vcpu, false); vcpu->arch.hflags |= HF_SMM_MASK; if (ret) return ret; @@ -14257,7 +14251,7 @@ static int vmx_set_nested_state(struct kvm_vcpu *vcpu, return -EINVAL; vmx->nested.dirty_vmcs12 = true; - ret = nested_vmx_enter_non_root_mode(vcpu, NULL); + ret = nested_vmx_enter_non_root_mode(vcpu, false); if (ret) return -EINVAL;