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[34.126.98.232]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-74eb9f49502sm1369146b3a.115.2025.07.10.02.04.23 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 10 Jul 2025 02:04:28 -0700 (PDT) Date: Thu, 10 Jul 2025 09:04:19 +0000 From: Pranjal Shrivastava To: Jason Gunthorpe Cc: Nicolin Chen , kevin.tian@intel.com, corbet@lwn.net, will@kernel.org, bagasdotme@gmail.com, robin.murphy@arm.com, joro@8bytes.org, thierry.reding@gmail.com, vdumpa@nvidia.com, jonathanh@nvidia.com, shuah@kernel.org, jsnitsel@redhat.com, nathan@kernel.org, peterz@infradead.org, yi.l.liu@intel.com, mshavit@google.com, zhangzekun11@huawei.com, iommu@lists.linux.dev, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-tegra@vger.kernel.org, linux-kselftest@vger.kernel.org, patches@lists.linux.dev, mochs@nvidia.com, alok.a.tiwari@oracle.com, vasant.hegde@amd.com, dwmw2@infradead.org, baolu.lu@linux.intel.com Subject: Re: [PATCH v7 27/28] iommu/tegra241-cmdqv: Add user-space use support Message-ID: References: <20250702180541.GD1139770@nvidia.com> <20250703175532.GF1209783@nvidia.com> <20250704125012.GK1209783@nvidia.com> Precedence: bulk X-Mailing-List: iommu@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20250704125012.GK1209783@nvidia.com> On Fri, Jul 04, 2025 at 09:50:12AM -0300, Jason Gunthorpe wrote: > On Thu, Jul 03, 2025 at 06:48:42PM +0000, Pranjal Shrivastava wrote: > > > Ahh, thanks for this, that saved a lot of my time! And yes, I see some > > functions in eventq.c calling the iopf_group_response which settles the > > CMD_RESUME. So.. I assume these resume commands would be trapped and > > *actually* executed through this or a similar path for vPRI. > > Yes, that is what Intel did. PRI has to be tracked in the kernel > because we have to ack requests eventually. If the VMM crashes the > kernel has to ack everything and try to clean up. > I see.. thanks for clarifying! > Also SMMUv3 does not support PRI today, just stall. > Ack. Thanks! > Jason Praan