From: Maxim Levitsky Date: Mon, 13 Sep 2021 14:09:52 +0000 (+0300) Subject: KVM: x86: VMX: synthesize invalid VM exit when emulating invalid guest state X-Git-Tag: microblaze-v5.18~698^2~28 X-Git-Url: http://git.monstr.eu/?a=commitdiff_plain;h=c42dec148b3e1a88835e275b675e5155f99abd43;p=linux-2.6-microblaze.git KVM: x86: VMX: synthesize invalid VM exit when emulating invalid guest state 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 Signed-off-by: Maxim Levitsky Message-Id: <20210913140954.165665-6-mlevitsk@redhat.com> Signed-off-by: Paolo Bonzini --- diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c index f7eb0ce0ddb5..1c2296fa7f2b 100644 --- a/arch/x86/kvm/vmx/vmx.c +++ b/arch/x86/kvm/vmx/vmx.c @@ -6622,10 +6622,21 @@ 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; + } trace_kvm_entry(vcpu);