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

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Message-ID: <aRZ9FHvDXmDJ-K39@kbusch-mbp>
Date: Thu, 13 Nov 2025 19:51:32 -0500
From: Keith Busch <kbusch@...nel.org>
To: Paolo Bonzini <pbonzini@...hat.com>
Cc: linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
	chang.seok.bae@...el.com
Subject: Re: [PATCH 00/10] KVM: emulate: enable AVX moves

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.