On Fri, 27 Jul 2018 13:13:40 +0200
Halil Pasic <pasic@xxxxxxxxxxxxx> wrote:
> >> @@ -65,6 +66,21 @@ static int vfio_ap_matrix_dev_create(void)
> >> {
> >> int ret;
> >>
> >> + mutex_init(&matrix_dev.lock);
> >> + INIT_LIST_HEAD(&matrix_dev.mdev_list);
> >> +
> >> + /* Test if PQAP(QCI) instruction is available */
> >> + if (test_facility(12)) {
> >> + ret = ap_qci(&matrix_dev.info);
> >> + if (ret && (ret != -EOPNOTSUPP)) {
> >
> > So, is facility 12 a pre-req for PQAP(QCI)? Can the code work if
> > matrix_dev.info is not populated?
>
> Yes and yes. It's basically only used in vfio_ap_matrix_init() and it
> has fallbacks.
Ok. So facility 12 is required but not sufficient for PQAP(QCI) to be
available? (Just asking as I cannot check the doc; if it works with
fallbacks I'm fine.)
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