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[142.68.128.5]) by smtp.gmail.com with ESMTPSA id d75a77b69052e-4747242e3adsm25490711cf.65.2025.02.28.06.56.37 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 28 Feb 2025 06:56:37 -0800 (PST) Received: from jgg by wakko with local (Exim 4.97) (envelope-from ) id 1to1n2-00000000RfZ-3KQI; Fri, 28 Feb 2025 10:56:36 -0400 Date: Fri, 28 Feb 2025 10:56:36 -0400 From: Jason Gunthorpe To: Vasant Hegde Cc: "Tian, Kevin" , Robin Murphy , "Liu, Yi L" , "iommu@lists.linux.dev" , "joro@8bytes.org" , "will@kernel.org" , "suravee.suthikulpanit@amd.com" Subject: Re: [PATCH] iommu/amd: Add Secure ATS support Message-ID: <20250228145636.GL5011@ziepe.ca> References: <20250225105829.52223-1-vasant.hegde@amd.com> <20250225145518.GJ545008@ziepe.ca> <20250226011750.GB5011@ziepe.ca> <4fba254e-ca47-4e7b-baf3-0228d9605c2b@amd.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: <4fba254e-ca47-4e7b-baf3-0228d9605c2b@amd.com> On Thu, Feb 27, 2025 at 08:57:45PM +0530, Vasant Hegde wrote: > - If HW has a enforcement required (like AMD SNP case where Secure ATS is > must), enable secure ATS. But do we need some way to inform core layer? If yes, > may be have an domain ops similar to def_domain_type() ? Yeah I think that is probably the best option, some kind of callback to the drive to check if a platform forced secure ATS is neccessary. I assume if you need forced secure ATS then you also are disabling IDENTITY and disabling PASID? Jason