linux-kernel - Re: [PULL] topic/iomem-mmap-vs-gup

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Message-ID: <YJlz+p787mK8tAh+@google.com>
Date:   Mon, 10 May 2021 17:57:14 +0000
From:   Sean Christopherson <seanjc@...gle.com>
To:     Jason Gunthorpe <jgg@...pe.ca>
Cc:     Daniel Vetter <daniel.vetter@...ll.ch>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Tomasz Figa <tfiga@...omium.org>,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        DRI Development <dri-devel@...ts.freedesktop.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Linux-MM <linux-mm@...ck.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        Linux Media Mailing List <linux-media@...r.kernel.org>,
        linux-samsung-soc <linux-samsung-soc@...r.kernel.org>,
        Paolo Bonzini <pbonzini@...hat.com>
Subject: Re: [PULL] topic/iomem-mmap-vs-gup

+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.