>>> On 29.03.18 at 10:42, <paul.durr...@citrix.com> wrote: >> From: Jan Beulich [mailto:jbeul...@suse.com] >> Sent: 29 March 2018 07:27 >> >> Suppressing the stdvga port intercepts has, btw, not helped the >> situation. >> > > That surprises me. The whole string emulation should go out to QEMU without > being broken up in that case, and since it's an outsw I don't see why there > would be any retry of the linear->physical translation during completion.
See the patch sent earlier: HVMIO_mmio_completion means a full second (or further) run through the emulator (which that patch now avoids). Same would occur for an insn reading and writing multiple memory locations, if at least the second one is in MMIO. In that case we can't avoid the completion though, as the access may additionally have been split (and we still need to execute its later part(s)). To fully address this, I don't see a way around recording completed steps (which is going to be a pretty intrusive change as it looks). Jan _______________________________________________ Xen-devel mailing list Xen-devel@lists.xenproject.org https://lists.xenproject.org/mailman/listinfo/xen-devel
