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[47.54.130.67]) by smtp.gmail.com with ESMTPSA id 6a1803df08f44-8b02e035b0asm120411376d6.22.2026.04.22.05.40.42 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 22 Apr 2026 05:40:42 -0700 (PDT) Received: from jgg by wakko with local (Exim 4.97) (envelope-from ) id 1wFWsj-00000007c2r-46xO; Wed, 22 Apr 2026 09:40:41 -0300 Date: Wed, 22 Apr 2026 09:40:41 -0300 From: Jason Gunthorpe To: Sami Mujawar Cc: Suzuki Poulose , Dan Williams , "linux-arm-kernel@lists.infradead.org" , "linux-kernel@vger.kernel.org" , Catalin Marinas , "will@kernel.org" , "thuth@redhat.com" , Steven Price , "gshan@redhat.com" , Yeoreum Yun , "cedric.xing@intel.com" , Dan Williams , Dionna Glaze , "Aneesh Kumar K . V" , Alexey Kardashevskiy , "linux-coco@lists.linux.dev" Subject: Re: [PATCH 0/3] arm64/virt: Add Arm CCA measurement register support Message-ID: <20260422124041.GJ3611611@ziepe.ca> References: <20260413084957.327661-1-sami.mujawar@arm.com> <20260413125925.GK3694781@ziepe.ca> <514ddb27-137b-4223-84fe-2152737db3a6@arm.com> <20260414122950.GW3694781@ziepe.ca> <20260414133525.GA2577880@ziepe.ca> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260422_054045_198522_AEBECCA8 X-CRM114-Status: GOOD ( 16.43 ) 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 Wed, Apr 22, 2026 at 08:57:00AM +0000, Sami Mujawar wrote: > > So this is tying it to the same FW event log that TPM uses. > > > > I think that strengthens my point this should all be uninform. TPM > > drivers are directly exposing the event log today, but I guess that > > needs generalization if non-TPM drivers are going to present it as > > well. > > > > How do you imagine getting and manipulating the EFI event log to use > > with this? > > The event logs from UEFI will be handed off to the OS using CCEL > ACPI table. The CCEL table spec update can be seen at > https://github.com/tianocore/edk2/issues/11384 I ment from linux userspace. event log is well establihsed in the aCPI side for TPM and in Linux today it is only exposed to userspace through TPM. This is not TPM, so how do you intend to give the event log to userspace? Jason