diff options
author | Kyle Huey <me@kylehuey.com> | 2016-11-29 12:40:39 -0800 |
---|---|---|
committer | Paolo Bonzini <pbonzini@redhat.com> | 2016-12-08 15:31:04 +0100 |
commit | eb2775621701e6ee3ea2a474437d04e93ccdcb2f (patch) | |
tree | 8fc49dc116f75a2e045c9b39dbdf425e59a8ca7d /arch | |
parent | 09ca3f20492fb0b03060b56a47afa211476740a8 (diff) |
KVM: VMX: Move skip_emulated_instruction out of nested_vmx_check_vmcs12
We can't return both the pass/fail boolean for the vmcs and the upcoming
continue/exit-to-userspace boolean for skip_emulated_instruction out of
nested_vmx_check_vmcs, so move skip_emulated_instruction out of it instead.
Additionally, VMENTER/VMRESUME only trigger singlestep exceptions when
they advance the IP to the following instruction, not when they a) succeed,
b) fail MSR validation or c) throw an exception. Add a separate call to
skip_emulated_instruction that will later not be converted to the variant
that checks the singlestep flag.
Signed-off-by: Kyle Huey <khuey@kylehuey.com>
Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>
Diffstat (limited to 'arch')
-rw-r--r-- | arch/x86/kvm/vmx.c | 53 |
1 files changed, 33 insertions, 20 deletions
diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c index f2f9cf595c07..f4f6304f9583 100644 --- a/arch/x86/kvm/vmx.c +++ b/arch/x86/kvm/vmx.c @@ -7324,7 +7324,6 @@ static int nested_vmx_check_vmcs12(struct kvm_vcpu *vcpu) struct vcpu_vmx *vmx = to_vmx(vcpu); if (vmx->nested.current_vmptr == -1ull) { nested_vmx_failInvalid(vcpu); - skip_emulated_instruction(vcpu); return 0; } return 1; @@ -7338,9 +7337,13 @@ static int handle_vmread(struct kvm_vcpu *vcpu) u32 vmx_instruction_info = vmcs_read32(VMX_INSTRUCTION_INFO); gva_t gva = 0; - if (!nested_vmx_check_permission(vcpu) || - !nested_vmx_check_vmcs12(vcpu)) + if (!nested_vmx_check_permission(vcpu)) + return 1; + + if (!nested_vmx_check_vmcs12(vcpu)) { + skip_emulated_instruction(vcpu); return 1; + } /* Decode instruction info and find the field to read */ field = kvm_register_readl(vcpu, (((vmx_instruction_info) >> 28) & 0xf)); @@ -7388,10 +7391,14 @@ static int handle_vmwrite(struct kvm_vcpu *vcpu) u64 field_value = 0; struct x86_exception e; - if (!nested_vmx_check_permission(vcpu) || - !nested_vmx_check_vmcs12(vcpu)) + if (!nested_vmx_check_permission(vcpu)) return 1; + if (!nested_vmx_check_vmcs12(vcpu)) { + skip_emulated_instruction(vcpu); + return 1; + } + if (vmx_instruction_info & (1u << 10)) field_value = kvm_register_readl(vcpu, (((vmx_instruction_info) >> 3) & 0xf)); @@ -10046,11 +10053,12 @@ static int nested_vmx_run(struct kvm_vcpu *vcpu, bool launch) bool ia32e; u32 msr_entry_idx; - if (!nested_vmx_check_permission(vcpu) || - !nested_vmx_check_vmcs12(vcpu)) + if (!nested_vmx_check_permission(vcpu)) return 1; - skip_emulated_instruction(vcpu); + if (!nested_vmx_check_vmcs12(vcpu)) + goto out; + vmcs12 = get_vmcs12(vcpu); if (enable_shadow_vmcs) @@ -10070,33 +10078,33 @@ static int nested_vmx_run(struct kvm_vcpu *vcpu, bool launch) nested_vmx_failValid(vcpu, launch ? VMXERR_VMLAUNCH_NONCLEAR_VMCS : VMXERR_VMRESUME_NONLAUNCHED_VMCS); - return 1; + goto out; } if (vmcs12->guest_activity_state != GUEST_ACTIVITY_ACTIVE && vmcs12->guest_activity_state != GUEST_ACTIVITY_HLT) { nested_vmx_failValid(vcpu, VMXERR_ENTRY_INVALID_CONTROL_FIELD); - return 1; + goto out; } if (!nested_get_vmcs12_pages(vcpu, vmcs12)) { nested_vmx_failValid(vcpu, VMXERR_ENTRY_INVALID_CONTROL_FIELD); - return 1; + goto out; } if (nested_vmx_check_msr_bitmap_controls(vcpu, vmcs12)) { nested_vmx_failValid(vcpu, VMXERR_ENTRY_INVALID_CONTROL_FIELD); - return 1; + goto out; } if (nested_vmx_check_apicv_controls(vcpu, vmcs12)) { nested_vmx_failValid(vcpu, VMXERR_ENTRY_INVALID_CONTROL_FIELD); - return 1; + goto out; } if (nested_vmx_check_msr_switch_controls(vcpu, vmcs12)) { nested_vmx_failValid(vcpu, VMXERR_ENTRY_INVALID_CONTROL_FIELD); - return 1; + goto out; } if (!vmx_control_verify(vmcs12->cpu_based_vm_exec_control, @@ -10116,26 +10124,26 @@ static int nested_vmx_run(struct kvm_vcpu *vcpu, bool launch) vmx->nested.nested_vmx_entry_ctls_high)) { nested_vmx_failValid(vcpu, VMXERR_ENTRY_INVALID_CONTROL_FIELD); - return 1; + goto out; } if (((vmcs12->host_cr0 & VMXON_CR0_ALWAYSON) != VMXON_CR0_ALWAYSON) || ((vmcs12->host_cr4 & VMXON_CR4_ALWAYSON) != VMXON_CR4_ALWAYSON)) { nested_vmx_failValid(vcpu, VMXERR_ENTRY_INVALID_HOST_STATE_FIELD); - return 1; + goto out; } if (!nested_cr0_valid(vcpu, vmcs12->guest_cr0) || ((vmcs12->guest_cr4 & VMXON_CR4_ALWAYSON) != VMXON_CR4_ALWAYSON)) { nested_vmx_entry_failure(vcpu, vmcs12, EXIT_REASON_INVALID_STATE, ENTRY_FAIL_DEFAULT); - return 1; + goto out; } if (vmcs12->vmcs_link_pointer != -1ull) { nested_vmx_entry_failure(vcpu, vmcs12, EXIT_REASON_INVALID_STATE, ENTRY_FAIL_VMCS_LINK_PTR); - return 1; + goto out; } /* @@ -10155,7 +10163,7 @@ static int nested_vmx_run(struct kvm_vcpu *vcpu, bool launch) ia32e != !!(vmcs12->guest_ia32_efer & EFER_LME))) { nested_vmx_entry_failure(vcpu, vmcs12, EXIT_REASON_INVALID_STATE, ENTRY_FAIL_DEFAULT); - return 1; + goto out; } } @@ -10173,7 +10181,7 @@ static int nested_vmx_run(struct kvm_vcpu *vcpu, bool launch) ia32e != !!(vmcs12->host_ia32_efer & EFER_LME)) { nested_vmx_entry_failure(vcpu, vmcs12, EXIT_REASON_INVALID_STATE, ENTRY_FAIL_DEFAULT); - return 1; + goto out; } } @@ -10186,6 +10194,7 @@ static int nested_vmx_run(struct kvm_vcpu *vcpu, bool launch) if (!vmcs02) return -ENOMEM; + skip_emulated_instruction(vcpu); enter_guest_mode(vcpu); if (!(vmcs12->vm_entry_controls & VM_ENTRY_LOAD_DEBUG_CONTROLS)) @@ -10227,6 +10236,10 @@ static int nested_vmx_run(struct kvm_vcpu *vcpu, bool launch) * the success flag) when L2 exits (see nested_vmx_vmexit()). */ return 1; + +out: + skip_emulated_instruction(vcpu); + return 1; } /* |