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>

diff --git a/arch/x86/kvm/vmx/nested.c b/arch/x86/kvm/vmx/nested.c
index bfacf90..67f8fdf 100644 (file)
--- a/arch/x86/kvm/vmx/nested.c
+++ b/arch/x86/kvm/vmx/nested.c
@@ -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)),