Commit f3689e3f authored Jan 25, 2019 by Sean Christopherson Committed by Paolo Bonzini Feb 12, 2019

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: 773e8a04 ("x86/kvm: use Enlightened VMCS when running on Hyper-V")
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>

parent 831a3011

arch/x86/kvm/vmx/vmx.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -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)),