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[v3,10/33] KVM: nVMX: Explicitly reference the scratch reg in nested early checks

Message ID 20190125154120.19385-11-sean.j.christopherson@intel.com (mailing list archive)
State New, archived
Headers show
Series KVM: VMX: Move vCPU-run to proper asm sub-routine | expand

Commit Message

Sean Christopherson Jan. 25, 2019, 3:40 p.m. UTC 
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>
---
 arch/x86/kvm/vmx/nested.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
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Patch

diff --git a/arch/x86/kvm/vmx/nested.c b/arch/x86/kvm/vmx/nested.c
index 671887f7d8c7..b92291b8e54b 100644
--- a/arch/x86/kvm/vmx/nested.c
+++ b/arch/x86/kvm/vmx/nested.c
@@ -2756,7 +2756,7 @@  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 */