Re: [PATCH 00/10] KVM: emulate: enable AVX moves

Keith Busch
2025-11-14T00:51:49Z

On Thu, Nov 13, 2025 at 07:36:23PM -0500, Paolo Bonzini wrote:
> Over a year ago, Keith Busch posted an RFC patch to enable VMOVDQA
> and VMOVDQU instructions in the KVM emulator. The reason to do so
> is that people are using QEMU to emulate fancy devices whose drivers
> use those instructions with BARs that, on real hardware, would
> presumably support write combining. These same people obviously
> would appreciate being able to use KVM instead of emulation, hence
> the request.

Thanks so much! We do still use this, so I'm happy to see this moving. I
know it's been some time in the making, but I can appreciate this is
pretty gnarly and the details are important. I will be happy to give
this a run through the emulation devices, though it may be another week
or so before I can give it a spin.