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Commit fc2ba5a2 authored by Sean Christopherson's avatar Sean Christopherson Committed by Paolo Bonzini
Browse files

KVM: VMX: Call vCPU-run asm sub-routine from C and remove clobbering 



...now that the sub-routine follows standard calling conventions.

Signed-off-by: default avatarSean Christopherson <sean.j.christopherson@intel.com>
Signed-off-by: default avatarPaolo Bonzini <pbonzini@redhat.com>
parent 3b895ef4

arch/x86/kvm/vmx/vmx.c

+4 −15
Original line number Diff line number Diff line
@@ -6371,6 +6371,8 @@ void vmx_update_host_rsp(struct vcpu_vmx *vmx, unsigned long host_rsp) 
	}

}



bool __vmx_vcpu_run(struct vcpu_vmx *vmx, unsigned long *regs, bool launched);



static void vmx_vcpu_run(struct kvm_vcpu *vcpu)

{

	struct vcpu_vmx *vmx = to_vmx(vcpu);
@@ -6444,21 +6446,8 @@ static void vmx_vcpu_run(struct kvm_vcpu *vcpu) 
	if (vcpu->arch.cr2 != read_cr2())

		write_cr2(vcpu->arch.cr2);



	asm(

		"call __vmx_vcpu_run \n\t"

	      : ASM_CALL_CONSTRAINT, "=a"(vmx->fail),

#ifdef CONFIG_X86_64

		"=D"((int){0}), "=S"((int){0}), "=d"((int){0})

	      : "D"(vmx), "S"(&vcpu->arch.regs), "d"(vmx->loaded_vmcs->launched)

#else

		"=d"((int){0}), "=c"((int){0})

	      : "a"(vmx), "d"(&vcpu->arch.regs), "c"(vmx->loaded_vmcs->launched)

#endif

	      : "cc", "memory"

#ifdef CONFIG_X86_64

		, "rcx", "r8", "r9", "r10", "r11"

#endif

	      );

	vmx->fail = __vmx_vcpu_run(vmx, (unsigned long *)&vcpu->arch.regs,

				   vmx->loaded_vmcs->launched);



	vcpu->arch.cr2 = read_cr2();