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KVM: nVMX: Leave most VM-Exit info fields unmodified on failed VM-Entry

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[ Upstream commit c3634d25fb ]

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: 4704d0befb ("KVM: nVMX: Exiting from L2 to L1")
Signed-off-by: Sean Christopherson <seanjc@google.com>
Message-Id: <20220407002315.78092-3-seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Sean Christopherson 2022-04-07 00:23:14 +00:00 committed by Greg Kroah-Hartman
parent b546f668d0
commit 6f94c46fe1
1 changed files with 10 additions and 5 deletions
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15
arch/x86/kvm/vmx/nested.c
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@ -4202,12 +4202,12 @@ 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;
@ -4219,8 +4219,13 @@ 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