From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 6072BCA5FA7 for ; Tue, 29 Sep 2026 16:06:20 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:In-Reply-To:Content-Type: MIME-Version:References:Message-ID:Subject:Cc:To:From:Date:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=d6kGHt+rjMSbZ2WQycq15hKyUq5QbTI2t6Ebniifuo8=; b=ojRyqr9etO93INvULovWLMLr3p hO+1+gYDSvCmsSqTW6vJXdg2bXTBIg/f9/pZGWSUGPXLAz1zkhsEZ7WaPkl7xHuORxGeFCh1PyR1O HdlJSy9YEWQ5K40ZXtAGUWUyI0gtyWkoLKWknwgOHu76X6r2lD7H/lMrpG0pvQa+CvjxJ/lQwCxkk KM8e1Qqco5YomKOTf3OJjAQc2tLmTMiXgfbLJIQWT/mNb7VJft/SlVmvirLhUrbzxmkSnlDSqnxUJ b+LGnJQRVmQfwoN5Hg/YmasjDb3e2agzAbH7ZkaSc8bJ57g2vGJEyw5Blai/vkqRm6Le6P67xE9ru fsUtQRvw==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.99.1 #2 (Red Hat Linux)) id 1xBaLM-000000040eo-2Nrl; Tue, 29 Sep 2026 16:06:12 +0000 Received: from foss.arm.com ([217.140.110.172]) by bombadil.infradead.org with esmtp (Exim 4.99.1 #2 (Red Hat Linux)) id 1xBaLJ-000000040eF-3wu0 for linux-arm-kernel@lists.infradead.org; Tue, 29 Sep 2026 16:06:11 +0000 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> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20260422124041.GJ3611611@ziepe.ca> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260929_090610_118492_C6AD8CEE X-CRM114-Status: GOOD ( 19.66 ) 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 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