On 19/12/2014 02:30, Wu, Feng wrote: >>> How this can work well? All subsequent interrupts are delivered to >>> one vCPU? It shouldn't be the best solution, need more consideration. >> >> Well, it's a hardware limitation. The alternative (which is easy to >> implement) is to only do PI for single-CPU interrupts. This should work >> well for multiqueue NICs (and of course for UP guests :)), so perhaps >> it's a good idea to only support that as a first attempt. >> >> Paolo > > Paolo, what do you mean by "single-CPU interrupts"? Do you mean we don't > support lowest priority interrupts for PI? But Linux OS uses lowest priority > for most of the case? If so, we can hardly get benefit from this feature for > Linux guest OS.
You can post lowest priority interrupts if they are delivered to a single CPU, in which case they are effectively fixed priority. If they are broadcast to multiple CPUs, do not post them. Paolo _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu
