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[35.247.111.240]) by smtp.gmail.com with ESMTPSA id s21sm11918766pjn.29.2021.05.10.10.57.17 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 10 May 2021 10:57:18 -0700 (PDT) Date: Mon, 10 May 2021 17:57:14 +0000 From: Sean Christopherson To: Jason Gunthorpe Cc: Daniel Vetter , Linus Torvalds , Tomasz Figa , Marek Szyprowski , Mauro Carvalho Chehab , DRI Development , LKML , Linux-MM , Linux ARM , Linux Media Mailing List , linux-samsung-soc , Paolo Bonzini Subject: Re: [PULL] topic/iomem-mmap-vs-gup Message-ID: References: <20210510135031.GF2047089@ziepe.ca> <20210510153412.GG2047089@ziepe.ca> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20210510153412.GG2047089@ziepe.ca> Authentication-Results: imf21.hostedemail.com; dkim=pass header.d=google.com header.s=20161025 header.b=WDir0qDO; spf=pass (imf21.hostedemail.com: domain of seanjc@google.com designates 209.85.215.178 as permitted sender) smtp.mailfrom=seanjc@google.com; dmarc=pass (policy=reject) header.from=google.com X-Rspamd-Server: rspam01 X-Rspamd-Queue-Id: 0B2A6E000125 X-Stat-Signature: djcerg97i5895d75ktxb66yquq7wasbq Received-SPF: none (google.com>: No applicable sender policy available) receiver=imf21; identity=mailfrom; envelope-from=""; helo=mail-pg1-f178.google.com; client-ip=209.85.215.178 X-HE-DKIM-Result: pass/pass X-HE-Tag: 1620669434-650551 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: +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.