On 1/20/20 8:24 AM, Thomas Huth wrote:
The AIS feature has been disabled late in the v2.10 development cycle since
there were some issues with migration (see commit 3f2d07b3b01ea61126b -
"s390x/ais: for 2.10 stable: disable ais facility"). We originally wanted
to enable it again for newer machine types, but apparently we forgot to do
this so far. Let's do it for the new s390-ccw-virtio-5.0 machine now.
While at it, also add a more verbose comment why we need the *_allowed()
wrappers in s390-virtio-ccw.c.
Buglink: https://bugzilla.redhat.com/show_bug.cgi?id=1756946
Reviewed-by: David Hildenbrand <da...@redhat.com>
Signed-off-by: Thomas Huth <th...@redhat.com>
---
Took it for a spin with vfio-pci. With this patch applied, I see the
appropriate change reflected in guest /proc/cpuinfo. I did some tracing
and see the expected behavior changes (ex: hits in host
kvm_s390_injrect_airq that show suppression occurring). Data transfer
tests worked fine. Also sanity-tested that ais=off behaves as expected.
Looks good to me.
