From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by smtp.subspace.kernel.org (Postfix) with ESMTP id 653F74ED1AF for ; Tue, 29 Sep 2026 16:06:08 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=217.140.110.172 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1790697970; cv=none; b=uqbrmCh+1EHkIuI5h22OvYFgn0eVPhHsgAsMq3CQNYx+Z/fLVeE0Qrci6cRieIENFrK1ihE9Z5M3sxvC5DHATfHivNUoeG5ui65aX7/R6DfMPbF3eIQz3/tBYlTF5d0yyezd/QolK5guucx4RG0DZjt5sgCZpvaGCZxOgteLP60= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1790697970; c=relaxed/simple; bh=KqR996YT3lGlgif4zL+59hQfQW1sI1ucMoPzwCnhQbA=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=KrJst5ygEEWUvjJCyKyCD6PcKIkEI9KDw5VDGvQqWJ7w/PZJft2ofg2GpsVitOnDx8d2uKj2x8z7rqq9dI3g3g1f3lSNIiMFtVUIKIo1d9iudiGNLvFbLcJSHsAi5cEGC9V8IfmVOk98hRgV/n/BUBWLA9HoeFc3F7V8LewOWkI= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=arm.com; spf=pass smtp.mailfrom=arm.com; dkim=pass (1024-bit key) header.d=arm.com header.i=@arm.com header.b=FCUKssRQ; arc=none smtp.client-ip=217.140.110.172 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=arm.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=arm.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=arm.com header.i=@arm.com header.b="FCUKssRQ" Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id D43111516; Tue, 29 Sep 2026 09:06:03 -0700 (PDT) Received: from e129823.arm.com (e129823.arm.com [10.2.213.3]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 9DE0C3F85F; Tue, 29 Sep 2026 09:06:04 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=arm.com; s=foss; t=1790697967; bh=KqR996YT3lGlgif4zL+59hQfQW1sI1ucMoPzwCnhQbA=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=FCUKssRQD3SNhMXewWGC7g/l/UBx4ZbOS96rk2Y7SqhScQQmZ/CocIylzMLBjS5LI ftUKijR81omCwPfFRk5FNqmsIZ34IYz9SUzzn7W8n8hNCu5lNMzPRGTxuSpBCWvQVk myZ0/VFE4FAA0JUkQp6c02f8bqePWNT/VLgcSVfI= Date: Tue, 29 Sep 2026 17:06:02 +0100 From: Yeoreum Yun To: Jason Gunthorpe Cc: Sami Mujawar , 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: 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> <20260422124041.GJ3611611@ziepe.ca> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20260422124041.GJ3611611@ziepe.ca> Hi Jason, > 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? The event log would be exported via /sys/firmware/acpi/tables/data/CCEL with binary format just as TPM event log is also exported with binary format via binary_bios_measurements. Instead of Sami, I'll post v2 which rebased on for-next/smccc-bus in arm64 tree. Thanks. -- Sincerely, Yeoreum Yun