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[142.68.80.239]) by smtp.gmail.com with ESMTPSA id 6a1803df08f44-6c340bfa7b4sm15144086d6.28.2024.08.30.08.00.33 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 30 Aug 2024 08:00:33 -0700 (PDT) Received: from jgg by wakko with local (Exim 4.95) (envelope-from ) id 1sk372-00Ebsx-DP; Fri, 30 Aug 2024 12:00:32 -0300 Date: Fri, 30 Aug 2024 12:00:32 -0300 From: Jason Gunthorpe To: Jacob Pan Cc: Vasant Hegde , Yi Liu , iommu@lists.linux.dev, joro@8bytes.org, will@kernel.org, robin.murphy@arm.com, suravee.suthikulpanit@amd.com, baolu.lu@linux.intel.com, kevin.tian@intel.com Subject: Re: [PATCH 1/5] iommu: Enhance domain allocation code to take additional flags Message-ID: <20240830150032.GZ3468552@ziepe.ca> References: <20240821163147.GZ3468552@ziepe.ca> <67436cba-3d05-4528-9519-231b8396ed51@intel.com> <20240822124433.GD3468552@ziepe.ca> <0ca31cc6-1741-40d1-b8c1-20e6b4fc955a@intel.com> <8215e4d4-2077-4fca-a002-27ddbfc0ddf2@amd.com> <20240828145224.2e949806@DESKTOP-0403QTC.> <6741bdcc-d9ca-4090-805b-3a7f4a4d650a@amd.com> <20240829121002.GV3468552@ziepe.ca> <66d0b2a1.630a0220.1dd301.daceSMTPIN_ADDED_BROKEN@mx.google.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: <66d0b2a1.630a0220.1dd301.daceSMTPIN_ADDED_BROKEN@mx.google.com> On Thu, Aug 29, 2024 at 10:40:47AM -0700, Jacob Pan wrote: > I don't know where the guest can get the host page table root pointer, > perhaps just ignored? The vDTE created by the guest will have host translation disabled, and no host page table pointer. The vDTE will only point to a GCR3 table. Same as ARM. > On Intel, guest can just do S1 only, S2 pointer can be ignored > architectually based on PGTT (PASID Granular Translation Type). Yes, same idea. AMD is just lacking a bit to tell the guest that the HW doesn't support host translation :( :( :( Jason