On 8/10/20 10:55 AM, Laine Stump wrote:
On 8/10/20 4:38 AM, Christoph wrote:
xen_platform_pci=1
This setting is not supported in the libvirt libxl driver, but AFAICT
libxl sets the default to 'true' for HVM guests.
pci_msitranslate=1
This is also not supported in libvirt and unfortunately defaults to
'false'.
pci_permissive = 1
Patches have been submitted for this setting but so far there has not
been agreement on the schema change
https://www.redhat.com/archives/libvir-list/2020-April/msg01230.html
Hmm, so I see that discussion stalled after I asked a few questions, and then
you (Jim) made a few suggestions about where the attribute should go and what it
should be named. (note for newcomers - the original patch messages linked above
were at the end of April, but the replies discussing them were in May, so they
don't show up directly in the primitive mailman archive page for the original
messages; to see them you need to go here:
https://www.redhat.com/archives/libvir-list/2020-May/thread.html
then search for "permissive" in the page - this will show you followups to all
the original patch mails.
I'm not sure who should be pushing the discussion/decision - I've already said
my piece, and would be just as happy with anything as long as it doesn't
interfere with usage for qemu. Maybe someone else has a stronger opinion.
I just posted a V3 that supports a 'writeFiltering' attribute on the <source>
element
https://www.redhat.com/archives/libvir-list/2020-August/msg00465.html
E.g.
<hostdev mode='subsystem' type='pci'>
...
<source writeFiltering='no'>
<address .../>
</source>
</hostdev>
However, after reading your reply again, I realize I forgot to add the check you
requested in the qemu driver's post-parse validation logic. I can do that in V4
but I'd like to get some feedback on the modeling approach first.
Regards,
Jim
