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Mon, 03 Aug 2020 11:30:48 -0700 (PDT) Date: Mon, 3 Aug 2020 11:30:47 -0700 (PDT) X-X-Sender: rientjes@chino.kir.corp.google.com To: Christoph Hellwig Subject: Re: revert scope for 5.8, was Re: dma-pool fixes In-Reply-To: <20200803064438.GA19014@lst.de> Message-ID: References: <20200731130903.GA31110@lst.de> <20200801085706.GA2991@lst.de> <20200801173952.GA15542@lst.de> <20200803064438.GA19014@lst.de> User-Agent: Alpine 2.23 (DEB 453 2020-06-18) MIME-Version: 1.0 Cc: Amit Pundir , Linus Torvalds , iommu , jeremy.linton@arm.com, Caleb Connolly , linux-rpi-kernel@lists.infradead.org, Robin Murphy X-BeenThere: iommu@lists.linux-foundation.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: Development issues for Linux IOMMU support List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , From: David Rientjes via iommu Reply-To: David Rientjes Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: iommu-bounces@lists.linux-foundation.org Sender: "iommu" On Mon, 3 Aug 2020, Christoph Hellwig wrote: > On Sun, Aug 02, 2020 at 09:14:41PM -0700, David Rientjes wrote: > > Christoph: since we have atomic DMA coherent pools in 5.8 now, recall our > > previous discussions, including Greg KH, regarding backports to stable > > trees (we are interested in 5.4 and 5.6) of this support for the purposes > > of confidential VM users who wish to run their own SEV-enabled guests in > > cloud. > > > > Would you have any objections to backports being offered for this support > > now? We can prepare them immediately. Or, if you would prefer we hold > > off for a while, please let me know and we can delay it until you are more > > comfortable. (For confidential VM users, the ability to run your own > > unmodified stable kernel is a much different security story than a guest > > modified by the cloud provider.) > > Before we start backporting I think we need the two fixes from > the "dma pool fixes" series. Can you start reviewing them? I also > think we should probably wait at least until -rc2 for any fallout > before starting the backport. > Thanks Christoph, this makes perfect sense. I see Nicolas has refreshed the two patches: dma-pool: fix coherent pool allocations for IOMMU mappings dma-pool: Only allocate from CMA when in same memory zone and posted them again today on LKML for review. I'll review those and we'll send a full series of backports for stable consideration for 5.4 LTS and 5.6 around 5.9-rc2 timeframe. Thanks! _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu