Re: [PATCH] x86: KVM: svm: Fix a check in nested_svm_vmrun()

[Vitaly Kuznetsov <vkuznets@redhat.com>]

Dan Carpenter <dan.carpenter@oracle.com> writes:

> We refactored this code a bit and accidentally deleted the "-" character
> from "-EINVAL".  The kvm_vcpu_map() function never returns positive
> EINVAL.
>
> Fixes: c8e16b78c614 ("x86: KVM: svm: eliminate hardcoded RIP advancement from vmrun_interception()")
> Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
> ---
> From static analysis.  I don't really know the impact.
>
>
>  arch/x86/kvm/svm.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
> index 1f220a85514f..ef646e22d1ab 100644
> --- a/arch/x86/kvm/svm.c
> +++ b/arch/x86/kvm/svm.c
> @@ -3598,7 +3598,7 @@ static int nested_svm_vmrun(struct vcpu_svm *svm)
>  	vmcb_gpa = svm->vmcb->save.rax;
>  
>  	ret = kvm_vcpu_map(&svm->vcpu, gpa_to_gfn(vmcb_gpa), &map);
> -	if (ret == EINVAL) {
> +	if (ret == -EINVAL) {
>  		kvm_inject_gp(&svm->vcpu, 0);
>  		return 1;
>  	} else if (ret) {

I was hoping that my patch was OK and Paolo screwed it upon commit but
no, it's the same in my local branch and I'm left without excuses :-)

Reviewed-by: Vitaly Kuznetsov <vkuznets@redhat.com>

-- 
Vitaly