On Tue, May 5, 2015 at 5:17 PM, Julien Grall <julien.gr...@citrix.com> wrote: > On 05/05/15 12:06, Vijay Kilari wrote: >> One MSI per domain is always consumed because each domain during >> ITS initialization creates Virtual ITS and sends basic initialization >> commands (MAPC) > > AFAICT, MAPC won't be translated to a physical command. So not interrupt > completion is necessary. > > Couldn't we defer the interrupt completion allocation until a PCI device > is passthrough or a command requiring physical command is sent?
yes, but MAPC is generally followed by SYNC command and INVALL command is also received during guest driver init. On option that I can think of is that avoid posting to physical queue/completion interrupt allocation, untill first MAPD command arrives for that domain. Regards Vijay _______________________________________________ Xen-devel mailing list Xen-devel@lists.xen.org http://lists.xen.org/xen-devel
