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

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

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 07:41:19 -08:00 committed by Paolo Bonzini
parent 3b895ef486
commit fc2ba5a27a
1 changed files with 4 additions and 15 deletions
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19
arch/x86/kvm/vmx/vmx.c
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@ -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();