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KVM: nVMX: Capture VM-Fail via CC_{SET,OUT} in nested early checks 

...to take advantage of __GCC_ASM_FLAG_OUTPUTS__ when possible.

Reviewed-by: Jim Mattson <jmattson@google.com>
Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Sean Christopherson 2019-01-25 07:40:59 -08:00 committed by Paolo Bonzini
parent f1727b4954
commit bbc0b82392
1 changed files with 3 additions and 3 deletions
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6
arch/x86/kvm/vmx/nested.c
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@ -2768,12 +2768,12 @@ static int nested_vmx_check_vmentry_hw(struct kvm_vcpu *vcpu)
* VMLAUNCH and VMRESUME clear RFLAGS.{CF,ZF} on VM-Exit, set
* RFLAGS.CF on VM-Fail Invalid and set RFLAGS.ZF on VM-Fail
* Valid. vmx_vmenter() directly "returns" RFLAGS, and so the
* results of VM-Enter is captured via SETBE to vm_fail.
* results of VM-Enter is captured via CC_{SET,OUT} to vm_fail.
*/
"call vmx_vmenter\n\t"
"setbe %[fail]\n\t"
: ASM_CALL_CONSTRAINT, [fail]"=qm"(vm_fail)
CC_SET(be)
: ASM_CALL_CONSTRAINT, CC_OUT(be) (vm_fail)
: "c"(vmx), "d"((unsigned long)HOST_RSP),
[launched]"i"(offsetof(struct vcpu_vmx, __launched)),
[host_rsp]"i"(offsetof(struct vcpu_vmx, host_rsp)),