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Subject: Re: [PULL] topic/iomem-mmap-vs-gup
To:     Sean Christopherson <seanjc@google.com>,
        Jason Gunthorpe <jgg@ziepe.ca>
Cc:     Daniel Vetter <daniel.vetter@ffwll.ch>,
        Linus Torvalds <torvalds@linux-foundation.org>,
        Tomasz Figa <tfiga@chromium.org>,
        Marek Szyprowski <m.szyprowski@samsung.com>,
        Mauro Carvalho Chehab <mchehab@kernel.org>,
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        Linux-MM <linux-mm@kvack.org>,
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From:   Paolo Bonzini <pbonzini@redhat.com>
Message-ID: <dcdc8bea-ebe8-bbcb-b581-309d9acf1657@redhat.com>
Date:   Mon, 10 May 2021 20:13:31 +0200
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On 10/05/21 19:57, Sean Christopherson wrote:
> +Paolo
> 
> On Mon, May 10, 2021, Jason Gunthorpe wrote:
>> On Mon, May 10, 2021 at 04:55:39PM +0200, Daniel Vetter wrote:
>>
>>> yeah vfio is still broken for the case I care about. I think there's
>>> also some questions open still about whether kvm really uses
>>> mmu_notifier in all cases correctly,
>>
>> IIRC kvm doesn't either.
> 
> Yep, KVM on x86 has a non-trivial number of flows that don't properly hook into
> the mmu_notifier.  Paolo is working on fixing the problem, but I believe the
> rework won't be ready until 5.14.

Yeah, I like the way it's coming, but I'm at 20-ish patches and counting.

Paolo