From: Sean Christopherson Date: Fri, 25 Jan 2019 15:40:52 +0000 (-0800) Subject: KVM: VMX: Save RSI to an unused output in the vCPU-run asm blob X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=f3689e3f17f064fd4cd5f0cb01ae2395c94f39d9;p=openwrt%2Fstaging%2Fblogic.git KVM: VMX: Save RSI to an unused output in the vCPU-run asm blob RSI is clobbered by the vCPU-run asm blob, but it's not marked as such, probably because GCC doesn't let you mark inputs as clobbered. "Save" RSI to a dummy output so that GCC recognizes it as being clobbered. Fixes: 773e8a0425c9 ("x86/kvm: use Enlightened VMCS when running on Hyper-V") Reviewed-by: Jim Mattson Signed-off-by: Sean Christopherson Signed-off-by: Paolo Bonzini --- diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c index cb0dd17c31c6..3ae51a09f420 100644 --- a/arch/x86/kvm/vmx/vmx.c +++ b/arch/x86/kvm/vmx/vmx.c @@ -6481,7 +6481,7 @@ static void __vmx_vcpu_run(struct kvm_vcpu *vcpu, struct vcpu_vmx *vmx) "xor %%edi, %%edi \n\t" "xor %%ebp, %%ebp \n\t" "pop %%" _ASM_BP "; pop %%" _ASM_DX " \n\t" - : ASM_CALL_CONSTRAINT + : ASM_CALL_CONSTRAINT, "=S"((int){0}) : "c"(vmx), "d"((unsigned long)HOST_RSP), "S"(evmcs_rsp), [launched]"i"(offsetof(struct vcpu_vmx, __launched)), [fail]"i"(offsetof(struct vcpu_vmx, fail)),