From a1d52910a0f46abac76f99ea409e8d91f4e6e1c9 Mon Sep 17 00:00:00 2001 From: Sean Christopherson Date: Thu, 7 Apr 2022 00:23:14 +0000 Subject: [PATCH] KVM: nVMX: Leave most VM-Exit info fields unmodified on failed VM-Entry [ Upstream commit c3634d25fbee88e2368a8e0903ae0d0670eb9e71 ] Don't modify vmcs12 exit fields except EXIT_REASON and EXIT_QUALIFICATION when performing a nested VM-Exit due to failed VM-Entry. Per the SDM, only the two aformentioned fields are filled and "All other VM-exit information fields are unmodified". Fixes: 4704d0befb07 ("KVM: nVMX: Exiting from L2 to L1") Signed-off-by: Sean Christopherson Message-Id: <20220407002315.78092-3-seanjc@google.com> Signed-off-by: Paolo Bonzini Signed-off-by: Sasha Levin --- arch/x86/kvm/vmx/nested.c | 15 ++++++++++----- 1 file changed, 10 insertions(+), 5 deletions(-) diff --git a/arch/x86/kvm/vmx/nested.c b/arch/x86/kvm/vmx/nested.c index 5eae69c..e0b5a4a 100644 --- a/arch/x86/kvm/vmx/nested.c +++ b/arch/x86/kvm/vmx/nested.c @@ -4185,12 +4185,12 @@ static void prepare_vmcs12(struct kvm_vcpu *vcpu, struct vmcs12 *vmcs12, if (to_vmx(vcpu)->exit_reason.enclave_mode) vmcs12->vm_exit_reason |= VMX_EXIT_REASONS_SGX_ENCLAVE_MODE; vmcs12->exit_qualification = exit_qualification; - vmcs12->vm_exit_intr_info = exit_intr_info; - - vmcs12->idt_vectoring_info_field = 0; - vmcs12->vm_exit_instruction_len = vmcs_read32(VM_EXIT_INSTRUCTION_LEN); - vmcs12->vmx_instruction_info = vmcs_read32(VMX_INSTRUCTION_INFO); + /* + * On VM-Exit due to a failed VM-Entry, the VMCS isn't marked launched + * and only EXIT_REASON and EXIT_QUALIFICATION are updated, all other + * exit info fields are unmodified. + */ if (!(vmcs12->vm_exit_reason & VMX_EXIT_REASONS_FAILED_VMENTRY)) { vmcs12->launch_state = 1; @@ -4202,8 +4202,13 @@ static void prepare_vmcs12(struct kvm_vcpu *vcpu, struct vmcs12 *vmcs12, * Transfer the event that L0 or L1 may wanted to inject into * L2 to IDT_VECTORING_INFO_FIELD. */ + vmcs12->idt_vectoring_info_field = 0; vmcs12_save_pending_event(vcpu, vmcs12); + vmcs12->vm_exit_intr_info = exit_intr_info; + vmcs12->vm_exit_instruction_len = vmcs_read32(VM_EXIT_INSTRUCTION_LEN); + vmcs12->vmx_instruction_info = vmcs_read32(VMX_INSTRUCTION_INFO); + /* * According to spec, there's no need to store the guest's * MSRs if the exit is due to a VM-entry failure that occurs -- 2.7.4