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Thu, 6 Feb 2025 17:02:40 +0000 Received: from CH3PR12MB8659.namprd12.prod.outlook.com ([fe80::6eb6:7d37:7b4b:1732]) by CH3PR12MB8659.namprd12.prod.outlook.com ([fe80::6eb6:7d37:7b4b:1732%6]) with mapi id 15.20.8398.025; Thu, 6 Feb 2025 17:02:39 +0000 Date: Thu, 6 Feb 2025 13:02:38 -0400 From: Jason Gunthorpe To: Shameerali Kolothum Thodi Cc: Daniel =?utf-8?B?UC4gQmVycmFuZ8Op?= , "qemu-arm@nongnu.org" , "qemu-devel@nongnu.org" , "eric.auger@redhat.com" , "peter.maydell@linaro.org" , "nicolinc@nvidia.com" , "ddutile@redhat.com" , Linuxarm , "Wangzhou (B)" , jiangkunkun , Jonathan Cameron , "zhangfei.gao@linaro.org" , "nathanc@nvidia.com" Subject: Re: [RFC PATCH 0/5] hw/arm/virt: Add support for user-creatable nested SMMUv3 Message-ID: <20250206170238.GG2960738@nvidia.com> References: <20241108125242.60136-1-shameerali.kolothum.thodi@huawei.com> <7ecabe74e0514367baf28d67675e5db8@huawei.com> <47d2c2556d794d87abf440263b2f7cd8@huawei.com> <71116749d1234ab48a205fd2588151ec@huawei.com> Content-Type: text/plain; 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envelope-from=jgg@nvidia.com; helo=NAM12-DM6-obe.outbound.protection.outlook.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org On Thu, Feb 06, 2025 at 03:07:06PM +0000, Shameerali Kolothum Thodi wrote: > > If we set the physical/guest SMMU relationship directly, then at the > > time the VFIO device is plugged, we can diagnose the incorrectly > > placed VFIO device, and better reason about behaviour. > > Agree. Can you just take in a VFIO cdev FD reference on this command line: -device arm-smmuv3-accel,id=smmuv2,bus=pcie.2 And that will lock the pSMMU/vSMMU relationship? Jason