On 17/09/2019 07:14, Jan Beulich wrote: > I can't see any technical or performance reason why we should treat > 32-bit PV different from 64-bit PV in this regard.
Well, other than the fact this setting is only read for a 64bit guest... The reason it isn't set for 32bit guests is that there is no scenario where we use it. For PV guests in general, we could consider making a similar optimisation to Linux and having a LRU list of 4 or so PCIDs to speed up process context switches, which would be applicable to 32bit guests as well (so long as someone can reason about the TLB flushing behaviour of the PV ABI), but this sounds like a large quantity of work. ~Andrew _______________________________________________ Xen-devel mailing list Xen-devel@lists.xenproject.org https://lists.xenproject.org/mailman/listinfo/xen-devel
