On 31/10/2018 13:36, Christian Borntraeger wrote:
On 10/31/2018 01:29 PM, Cornelia Huck wrote:
On Wed, 31 Oct 2018 13:11:10 +0100
Christian Borntraeger <borntraeger@xxxxxxxxxx> wrote:
On 10/31/2018 11:09 AM, David Hildenbrand wrote:
On 25.10.18 14:37, Michael Mueller wrote:
The Guest Information Area (GIB) and its mechanics is part of
the AIV facility. It provides hardware support to process
Adapter Interruptions (AI) for pagable storage mode guests.
Whenever a guest cannot process an AI because none of its
vcpus is running in SIE context, a GIB alert interruption is
sent to and handled by the host program to dispatch a vcpu of
the respective guest.
Eventually, the AI is handled by the guest.
This does not apply to vSIE, right?
We do not provide GISA, GIB and friends to the guest (e.g. we do not have
the scp bits set). So right now we do not have anything to do for vsie.
Any plans to do so in the future?
Since GISA is just a performance optimization I am not sure if we really want
to go down the path to also provide that for nested guests. Right now it this
is just a speedup that the guest1 can use to improve the speed of guest2. If
guest3 is a bit slower that should be fine for now.
Pierre can you post your patches that make use of the GIB in vfio-ap so that
everybody can see the full picture?
OK, I do.
--
Pierre Morel
Linux/KVM/QEMU in Böblingen - Germany
