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KVM: nVMX: Explicitly reference the scratch reg in nested early checks 

Using %1 to reference RCX, i.e. the 'vmx' pointer', is obtuse and
fragile, e.g. it results in cryptic and infurating compile errors if the
output constraints are touched by anything more than a gentle breeze.

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 07:40:57 -08:00 committed by Paolo Bonzini
parent 98ff2acc91
commit 6c1e7e5b40
1 changed files with 1 additions and 1 deletions
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arch/x86/kvm/vmx/nested.c
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@ -2757,7 +2757,7 @@ static int nested_vmx_check_vmentry_hw(struct kvm_vcpu *vcpu)
/* Set HOST_RSP */
"sub $%c[wordsize], %%" _ASM_SP "\n\t" /* temporarily adjust RSP for CALL */
__ex("vmwrite %%" _ASM_SP ", %%" _ASM_DX) "\n\t"
"mov %%" _ASM_SP ", %c[host_rsp](%1)\n\t"
"mov %%" _ASM_SP ", %c[host_rsp](%% " _ASM_CX ")\n\t"
"add $%c[wordsize], %%" _ASM_SP "\n\t" /* un-adjust RSP */
/* Check if vmlaunch or vmresume is needed */