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g10sm1266707pfk.79.2019.11.12.22.24.00 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 12 Nov 2019 22:24:02 -0800 (PST) Subject: Re: virtio,iommu_platform=on To: Michael Roth , qemu-devel@nongnu.org References: <17da2769-1999-a0a3-590d-9f9bc6a9adc3@ozlabs.ru> <157362449788.24851.9129567746458175944@sif> From: Alexey Kardashevskiy Autocrypt: addr=aik@ozlabs.ru; keydata= mQINBE+rT0sBEADFEI2UtPRsLLvnRf+tI9nA8T91+jDK3NLkqV+2DKHkTGPP5qzDZpRSH6mD EePO1JqpVuIow/wGud9xaPA5uvuVgRS1q7RU8otD+7VLDFzPRiRE4Jfr2CW89Ox6BF+q5ZPV /pS4v4G9eOrw1v09lEKHB9WtiBVhhxKK1LnUjPEH3ifkOkgW7jFfoYgTdtB3XaXVgYnNPDFo PTBYsJy+wr89XfyHr2Ev7BB3Xaf7qICXdBF8MEVY8t/UFsesg4wFWOuzCfqxFmKEaPDZlTuR tfLAeVpslNfWCi5ybPlowLx6KJqOsI9R2a9o4qRXWGP7IwiMRAC3iiPyk9cknt8ee6EUIxI6 t847eFaVKI/6WcxhszI0R6Cj+N4y+1rHfkGWYWupCiHwj9DjILW9iEAncVgQmkNPpUsZECLT WQzMuVSxjuXW4nJ6f4OFHqL2dU//qR+BM/eJ0TT3OnfLcPqfucGxubhT7n/CXUxEy+mvWwnm s9p4uqVpTfEuzQ0/bE6t7dZdPBua7eYox1AQnk8JQDwC3Rn9kZq2O7u5KuJP5MfludMmQevm 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MIME-Version: 1.0 In-Reply-To: <157362449788.24851.9129567746458175944@sif> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit X-detected-operating-system: by eggs.gnu.org: Genre and OS details not recognized. X-Received-From: 2607:f8b0:4864:20::430 X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: "Michael S. Tsirkin" , David Gibson Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" On 13/11/2019 16:54, Michael Roth wrote: > Quoting Alexey Kardashevskiy (2019-11-11 21:53:49) >> Hi! >> >> I am enabling IOMMU for virtio in the pseries firmware (SLOF) and seeing >> problems, one of them is SLOF does SCSI bus scan, then it stops the >> virtio-scsi by clearing MMIO|IO|BUSMASTER from PCI_COMMAND (as SLOF >> stopped using the devices) and when this happens, I see unassigned >> memory access (see below) which happens because disabling busmaster >> disables IOMMU and QEMU cannot access the rings to do some shutdown. And >> when this happens, the device does not come back even if SLOF re-enables it. >> >> Hacking SLOF to not clear BUSMASTER makes virtio-scsi work but it is >> hardly a right fix. > > I hit the same issue enabling IOMMU for virtio-blk using this branch: > > https://github.com/mdroth/SLOF/commits/virtio-iommu > > I just sent a tentative fix for QEMU as: > > "virtio-pci: disable vring processing when bus-mastering is disabled" > > It's an RFC since piggy-backing off dev->broken seems a bit hacky, but > it seems to fix the issue at least. > > BTW, the SLOF branch above needs cleanup, but it's booting guests okay > and I was planning to post this week. Where are you at on yours? Maybe > we should sync up... Mine is here: github.com:aik/SLOF.git virtio-iommu Still have to debug a lot, right now virtio-net does not work :-/ Want to take over? :) -- Alexey