On 2020-06-09 11:41, Halil Pasic wrote:
On Tue, 9 Jun 2020 08:44:02 +0200
Cornelia Huck <coh...@redhat.com> wrote:
On Mon, 8 Jun 2020 19:00:45 +0200
Halil Pasic <pa...@linux.ibm.com> wrote:
...snip...
I mean, can a virtio devices without IOMMU_PLATFORM act as a transition
blocker (i.e. an attempt by a guest to move to pv would fail?)
I don't know. Janosch could answer that, but he is on vacation. Adding
Claudio maybe he can answer. My understanding is, that while it might be
possible, it is ugly at best. The ability to do a transition is
indicated by a CPU model feature. Indicating the feature to the guest and
then failing the transition sounds wrong to me.
The guest image is encrypted and the transition to PV is done by the
stage 3 boot loader, part of the loaded image, before Linux is started.
At this moment the guest is not aware of the virtio devices.
Regards,
Pierre
--
Pierre Morel
IBM Lab Boeblingen
