On 06/10/21 13:12, Sasha Levin wrote:
From: Maxim Levitsky <mlevitsk@xxxxxxxxxx>
[ Upstream commit c42dec148b3e1a88835e275b675e5155f99abd43 ]
Since no actual VM entry happened, the VM exit information is stale.
To avoid this, synthesize an invalid VM guest state VM exit.
Suggested-by: Sean Christopherson <seanjc@xxxxxxxxxx>
Signed-off-by: Maxim Levitsky <mlevitsk@xxxxxxxxxx>
Message-Id: <20210913140954.165665-6-mlevitsk@xxxxxxxxxx>
Signed-off-by: Paolo Bonzini <pbonzini@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
arch/x86/kvm/vmx/vmx.c | 17 ++++++++++++++---
1 file changed, 14 insertions(+), 3 deletions(-)
diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c
index fcd8bcb7e0ea..e3af56f05a37 100644
--- a/arch/x86/kvm/vmx/vmx.c
+++ b/arch/x86/kvm/vmx/vmx.c
@@ -6670,10 +6670,21 @@ static fastpath_t vmx_vcpu_run(struct kvm_vcpu *vcpu)
vmx->loaded_vmcs->soft_vnmi_blocked))
vmx->loaded_vmcs->entry_time = ktime_get();
- /* Don't enter VMX if guest state is invalid, let the exit handler
- start emulation until we arrive back to a valid state */
- if (vmx->emulation_required)
+ /*
+ * Don't enter VMX if guest state is invalid, let the exit handler
+ * start emulation until we arrive back to a valid state. Synthesize a
+ * consistency check VM-Exit due to invalid guest state and bail.
+ */
+ if (unlikely(vmx->emulation_required)) {
+ vmx->fail = 0;
+ vmx->exit_reason.full = EXIT_REASON_INVALID_STATE;
+ vmx->exit_reason.failed_vmentry = 1;
+ kvm_register_mark_available(vcpu, VCPU_EXREG_EXIT_INFO_1);
+ vmx->exit_qualification = ENTRY_FAIL_DEFAULT;
+ kvm_register_mark_available(vcpu, VCPU_EXREG_EXIT_INFO_2);
+ vmx->exit_intr_info = 0;
return EXIT_FASTPATH_NONE;
+ }
if (vmx->ple_window_dirty) {
vmx->ple_window_dirty = false;
NACK for this one.
The others are good, I'll ack them individually though. Thanks for
setting this up!
Paolo
