Re: [PATCH v4 4/4] KVM: SVM: Return -EINVAL instead of -EBUSY on attempt to re-init SEV/SEV-ES

[Tom Lendacky]

On 1/31/24 17:56, Sean Christopherson wrote:
> Return -EINVAL instead of -EBUSY if userspace attempts KVM_SEV{,ES}_INIT
> on a VM that already has SEV active.  Returning -EBUSY is nonsencial as
> it's impossible to deactivate SEV without destroying the VM, i.e. the VM
> isn't "busy" in any sane sense of the word, and the odds of any userspace
> wanting exactly -EBUSY on a userspace bug are minuscule.
>
> Signed-off-by: Sean Christopherson <seanjc@xxxxxxxxxx>

Reviewed-by: Tom Lendacky <thomas.lendacky@xxxxxxx>

> ---
>   arch/x86/kvm/svm/sev.c | 3 +--
>   1 file changed, 1 insertion(+), 2 deletions(-)
>
> diff --git a/arch/x86/kvm/svm/sev.c b/arch/x86/kvm/svm/sev.c
> index 38e40fbc7ea0..cb19b57e1031 100644
> --- a/arch/x86/kvm/svm/sev.c
> +++ b/arch/x86/kvm/svm/sev.c
> @@ -259,9 +259,8 @@ static int sev_guest_init(struct kvm *kvm, struct kvm_sev_cmd *argp)
>   	if (kvm->created_vcpus)
>   		return -EINVAL;
>   
> -	ret = -EBUSY;
>   	if (unlikely(sev->active))
> -		return ret;
> +		return -EINVAL;
>   
>   	sev->active = true;
>   	sev->es_active = argp->id == KVM_SEV_ES_INIT;