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[142.68.57.212]) by smtp.gmail.com with ESMTPSA id 199sm2417617qkm.7.2020.03.17.11.40.40 (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256); Tue, 17 Mar 2020 11:40:40 -0700 (PDT) Received: from jgg by mlx.ziepe.ca with local (Exim 4.90_1) (envelope-from ) id 1jEH8p-00016b-OY; Tue, 17 Mar 2020 15:40:39 -0300 Date: Tue, 17 Mar 2020 15:40:39 -0300 From: Jason Gunthorpe To: Christoph Hellwig Cc: Jean-Philippe Brucker , mark.rutland@arm.com, devicetree@vger.kernel.org, kevin.tian@intel.com, Dimitri Sivanich , Arnd Bergmann , Greg Kroah-Hartman , linux-pci@vger.kernel.org, robin.murphy@arm.com, linux-mm@kvack.org, iommu@lists.linux-foundation.org, robh+dt@kernel.org, catalin.marinas@arm.com, zhangfei.gao@linaro.org, Andrew Morton , will@kernel.org, christian.koenig@amd.com, linux-arm-kernel@lists.infradead.org Subject: Re: [PATCH v4 01/26] mm/mmu_notifiers: pass private data down to alloc_notifier() Message-ID: <20200317184039.GV20941@ziepe.ca> References: <20200224190056.GT31668@ziepe.ca> <20200225092439.GB375953@myrica> <20200225140814.GW31668@ziepe.ca> <20200228143935.GA2156@myrica> <20200228144844.GQ31668@ziepe.ca> <20200228150427.GF2156@myrica> <20200228151339.GS31668@ziepe.ca> <20200306095614.GA50020@myrica> <20200306130919.GJ31668@ziepe.ca> <20200316154659.GA18704@infradead.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20200316154659.GA18704@infradead.org> User-Agent: Mutt/1.9.4 (2018-02-28) 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: On Mon, Mar 16, 2020 at 08:46:59AM -0700, Christoph Hellwig wrote: > On Fri, Mar 06, 2020 at 09:09:19AM -0400, Jason Gunthorpe wrote: > > This is why release must do invalidate all - but it doesn't need to do > > any more - as no SPTE can be established without a mmget() - and > > mmget() is no longer possible past release. > > Maybe we should rename the release method to invalidate_all? It is a better name. The function it must also fence future access if the mirror is not using mmget(), and stop using the pgd/etc pointer if the page tables are accessed directly. Jason