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Tue, 29 Sep 2026 12:45:04 -0700 (PDT) Received: from ziepe.ca ([130.41.10.202]) by smtp.gmail.com with ESMTPSA id a92af1059eb24-14c63acab5esm1202011c88.10.2026.09.29.12.45.02 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 29 Sep 2026 12:45:03 -0700 (PDT) Received: from jgg by wakko with local (Exim 4.97) (envelope-from ) id 1xBdl7-00000009uUb-3ljP; Tue, 29 Sep 2026 16:45:01 -0300 Date: Tue, 29 Sep 2026 16:45:01 -0300 From: Jason Gunthorpe To: Yeoreum Yun Cc: linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, Catalin Marinas , Will Deacon , Suzuki Poulose , Steven Price , Sami Mujawar , thuth@redhat.com, Jiri Pirko Subject: Re: [PATCH v2 0/3] arm64/virt: Add Arm CCA measurement register support Message-ID: <20260929194501.GO163130@ziepe.ca> References: <20260929-arm_cca_mr-v2-0-1d98bba187fd@arm.com> <20260929192051.GN163130@ziepe.ca> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260929_124505_675550_83FAF64C X-CRM114-Status: GOOD ( 20.31 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Tue, Sep 29, 2026 at 08:42:36PM +0100, Yeoreum Yun wrote: > On Tue, Sep 29, 2026 at 04:20:51PM -0300, Jason Gunthorpe wrote: > > On Tue, Sep 29, 2026 at 05:57:46PM +0100, Yeoreum Yun wrote: > > > This series adds support for Arm Confidential Compute Architecture (CCA) > > > measurement registers in the Linux kernel, enabling guest Realms to > > > access, extend, and expose measurement values for attestation and runtime > > > integrity tracking. > > > > I'd prefer not to add any more tsm_measurements users until we bottom > > out on the attestation subsystem.. Mainly because it establishes uAPI > > that doesn't really do everything people need from this stuff.. > > Tend to agree. However, I think this seems like an integration with > the attestation subsystem. > IOW, although the functionality and interface are currently scattered, > the functionality of the TSM MR doesn't change — > showing the current measurement register status and generating > a token with a challenge. Therefore, even if the subsystem is refactored, > I don't think this would be a burden for it, and personally, > I'd like to see this patch series emancipated from almost six months of waiting ;) Yeah, but it immediately establishes a sysfs uAPI that we don't want anyone to implement :( That's my main issue.. Jason