On 12/22/20 2:43 PM, Halil Pasic wrote:
On Tue, 22 Dec 2020 16:57:06 +0100
Cornelia Huck <cohuck@xxxxxxxxxx> wrote:
On Tue, 22 Dec 2020 10:37:01 -0500
Tony Krowiak <akrowiak@xxxxxxxxxxxxx> wrote:
On 12/21/20 11:05 PM, Halil Pasic wrote:
On Mon, 21 Dec 2020 13:56:25 -0500
Tony Krowiak <akrowiak@xxxxxxxxxxxxx> wrote:
static int vfio_ap_mdev_group_notifier(struct notifier_block *nb,
unsigned long action, void *data)
{
- int ret;
+ int ret, notify_rc = NOTIFY_DONE;
struct ap_matrix_mdev *matrix_mdev;
if (action != VFIO_GROUP_NOTIFY_SET_KVM)
return NOTIFY_OK;
matrix_mdev = container_of(nb, struct ap_matrix_mdev, group_notifier);
+ mutex_lock(&matrix_dev->lock);
if (!data) {
- matrix_mdev->kvm = NULL;
- return NOTIFY_OK;
+ if (matrix_mdev->kvm)
+ vfio_ap_mdev_unset_kvm(matrix_mdev);
+ notify_rc = NOTIFY_OK;
+ goto notify_done;
}
ret = vfio_ap_mdev_set_kvm(matrix_mdev, data);
if (ret)
- return NOTIFY_DONE;
+ goto notify_done;
/* If there is no CRYCB pointer, then we can't copy the masks */
if (!matrix_mdev->kvm->arch.crypto.crycbd)
- return NOTIFY_DONE;
+ goto notify_done;
kvm_arch_crypto_set_masks(matrix_mdev->kvm, matrix_mdev->matrix.apm,
matrix_mdev->matrix.aqm,
matrix_mdev->matrix.adm);
- return NOTIFY_OK;
Shouldn't there be an
+ notify_rc = NOTIFY_OK;
here? I mean you initialize notify_rc to NOTIFY_DONE, in the !data branch
on success you set notify_rc to NOTIFY_OK, but in the !!data branch it
just stays NOTIFY_DONE. Or am I missing something?
I don't think it matters much since NOTIFY_OK and NOTIFY_DONE have
no further effect on processing of the notification queue, but I believe
you are correct, this is a change from what we originally had. I can
restore the original return values if you'd prefer.
Even if they have the same semantics now, that might change in the
future; restoring the original behaviour looks like the right thing to
do.
I agree. Especially since we do care to preserve the behavior in
the !data branch. If there is no difference between the two, then it
would probably make sense to clean that up globally.
Got it. I'm going to do a quick turnaround on the next version so we
can get this merged if need be. I will be taking off for Christmas vacation
and will be gone until sometime the first week in January.
Regards,
Halil
