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KVM: nVMX: Add VM-Enter failed tracepoints for super early checks 

Add tracepoints for the early consistency checks in nested_vmx_run().
The "VMLAUNCH vs. VMRESUME" check in particular is useful to trace, as
there is no architectural way to check VMCS.LAUNCH_STATE, and subtle
bugs such as VMCLEAR on the wrong HPA can lead to confusing errors in
the L1 VMM.

Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
Message-Id: <20200812180615.22372-1-sean.j.christopherson@intel.com>
Reviewed-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Sean Christopherson 2020-08-12 11:06:15 -07:00 committed by Paolo Bonzini
parent fb0f33fdef
commit fc595f3599
1 changed files with 5 additions and 5 deletions
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10
arch/x86/kvm/vmx/nested.c
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@ -3471,11 +3471,11 @@ static int nested_vmx_run(struct kvm_vcpu *vcpu, bool launch)
if (evmptrld_status == EVMPTRLD_ERROR) {
kvm_queue_exception(vcpu, UD_VECTOR);
return 1;
} else if (evmptrld_status == EVMPTRLD_VMFAIL) {
} else if (CC(evmptrld_status == EVMPTRLD_VMFAIL)) {
return nested_vmx_failInvalid(vcpu);
}
if (!vmx->nested.hv_evmcs && vmx->nested.current_vmptr == -1ull)
if (CC(!vmx->nested.hv_evmcs && vmx->nested.current_vmptr == -1ull))
return nested_vmx_failInvalid(vcpu);
vmcs12 = get_vmcs12(vcpu);
@ -3486,7 +3486,7 @@ static int nested_vmx_run(struct kvm_vcpu *vcpu, bool launch)
* rather than RFLAGS.ZF, and no error number is stored to the
* VM-instruction error field.
*/
if (vmcs12->hdr.shadow_vmcs)
if (CC(vmcs12->hdr.shadow_vmcs))
return nested_vmx_failInvalid(vcpu);
if (vmx->nested.hv_evmcs) {
@ -3507,10 +3507,10 @@ static int nested_vmx_run(struct kvm_vcpu *vcpu, bool launch)
* for misconfigurations which will anyway be caught by the processor
* when using the merged vmcs02.
*/
if (interrupt_shadow & KVM_X86_SHADOW_INT_MOV_SS)
if (CC(interrupt_shadow & KVM_X86_SHADOW_INT_MOV_SS))
return nested_vmx_fail(vcpu, VMXERR_ENTRY_EVENTS_BLOCKED_BY_MOV_SS);
if (vmcs12->launch_state == launch)
if (CC(vmcs12->launch_state == launch))
return nested_vmx_fail(vcpu,
launch ? VMXERR_VMLAUNCH_NONCLEAR_VMCS
: VMXERR_VMRESUME_NONLAUNCHED_VMCS);