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authorJim Mattson <jmattson@google.com>2017-09-14 16:31:42 -0700
committerPaolo Bonzini <pbonzini@redhat.com>2017-09-15 16:57:15 +0200
commitb060ca3b2e9e72ef005e2042476f95ee0b8839e9 (patch)
treed51154ca20d49fc64132e0c46e70d439093a4b72
parent7881f96cac4d420c94e62a4e1eea243899a7052e (diff)
kvm: vmx: Handle VMLAUNCH/VMRESUME failure properly
On an early VMLAUNCH/VMRESUME failure (i.e. one which sets the VM-instruction error field of the current VMCS), the launch state of the current VMCS is not set to "launched," and the VM-exit information fields of the current VMCS (including IDT-vectoring information and exit reason) are stale. On a late VMLAUNCH/VMRESUME failure (i.e. one which sets the high bit of the exit reason field), the launch state of the current VMCS is not set to "launched," and only two of the VM-exit information fields of the current VMCS are modified (exit reason and exit qualification). The remaining VM-exit information fields of the current VMCS (including IDT-vectoring information, in particular) are stale. Signed-off-by: Jim Mattson <jmattson@google.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
-rw-r--r--arch/x86/kvm/vmx.c14
1 files changed, 8 insertions, 6 deletions
diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index 29f85ed5a329..a0a78f09b22d 100644
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -9424,12 +9424,6 @@ static void __noclone vmx_vcpu_run(struct kvm_vcpu *vcpu)
| (1 << VCPU_EXREG_CR3));
vcpu->arch.regs_dirty = 0;
- vmx->idt_vectoring_info = vmcs_read32(IDT_VECTORING_INFO_FIELD);
-
- vmx->loaded_vmcs->launched = 1;
-
- vmx->exit_reason = vmcs_read32(VM_EXIT_REASON);
-
/*
* eager fpu is enabled if PKEY is supported and CR4 is switched
* back on host, so it is safe to read guest PKRU from current
@@ -9451,6 +9445,14 @@ static void __noclone vmx_vcpu_run(struct kvm_vcpu *vcpu)
kvm_make_request(KVM_REQ_EVENT, vcpu);
vmx->nested.nested_run_pending = 0;
+ vmx->idt_vectoring_info = 0;
+
+ vmx->exit_reason = vmx->fail ? 0xdead : vmcs_read32(VM_EXIT_REASON);
+ if (vmx->fail || (vmx->exit_reason & VMX_EXIT_REASONS_FAILED_VMENTRY))
+ return;
+
+ vmx->loaded_vmcs->launched = 1;
+ vmx->idt_vectoring_info = vmcs_read32(IDT_VECTORING_INFO_FIELD);
vmx_complete_atomic_exit(vmx);
vmx_recover_nmi_blocking(vmx);