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 lists.gnu.org (lists.gnu.org [209.51.188.17]) (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 E3077CCD1BE for ; Wed, 22 Oct 2025 05:56:14 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1vBRow-0002Ta-0m; Wed, 22 Oct 2025 01:55:38 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1vBRot-0002TA-2w for qemu-devel@nongnu.org; Wed, 22 Oct 2025 01:55:35 -0400 Received: from us-smtp-delivery-124.mimecast.com ([170.10.129.124]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1vBRoo-0007FG-HO for qemu-devel@nongnu.org; Wed, 22 Oct 2025 01:55:33 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1761112525; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=Qh+0pd1Ed/16vXTokbh7ngsrjjl7omjYQExvyONB83c=; b=URIMwjhu9auZfLCXYKG4W7YVXtpl8CIbeVnhuKtLd4GxWDUlTuXbhEkR6ZORd33nfZ2XOt 4zo2O9uad441pOyrTD4qIIixTdp7t0/OnaE+XbLevBb2r34r+t52rr31YXe0sPeFeh7HeE H0vv/Slv6x+bvCkptvLh9L+FC5ZnTw8= Received: from mx-prod-mc-01.mail-002.prod.us-west-2.aws.redhat.com (ec2-54-186-198-63.us-west-2.compute.amazonaws.com [54.186.198.63]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-103-rhovO5mYMz2pbjtMPj__tg-1; Wed, 22 Oct 2025 01:55:22 -0400 X-MC-Unique: rhovO5mYMz2pbjtMPj__tg-1 X-Mimecast-MFC-AGG-ID: rhovO5mYMz2pbjtMPj__tg_1761112520 Received: from mx-prod-int-06.mail-002.prod.us-west-2.aws.redhat.com (mx-prod-int-06.mail-002.prod.us-west-2.aws.redhat.com [10.30.177.93]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mx-prod-mc-01.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id E70D61956089; Wed, 22 Oct 2025 05:55:19 +0000 (UTC) Received: from blackfin.pond.sub.org (unknown [10.45.242.19]) by mx-prod-int-06.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id 1BB9F180035A; Wed, 22 Oct 2025 05:55:19 +0000 (UTC) Received: by blackfin.pond.sub.org (Postfix, from userid 1000) id 5E97721E6A27; Wed, 22 Oct 2025 07:55:16 +0200 (CEST) From: Markus Armbruster To: Gerd Hoffmann Cc: qemu-devel@nongnu.org, Eric Blake , Marcel Apfelbaum , Eduardo Habkost , Zhao Liu , Laurent Vivier , Philippe =?utf-8?Q?Mathieu-Daud=C3=A9?= , Paolo Bonzini , Fabiano Rosas , "Dr. David Alan Gilbert" , Yanan Wang Subject: Re: [PATCH v6 1/3] hw/uefi: add query-firmware-log monitor command In-Reply-To: <20251017115006.2696991-2-kraxel@redhat.com> (Gerd Hoffmann's message of "Fri, 17 Oct 2025 13:50:03 +0200") References: <20251017115006.2696991-1-kraxel@redhat.com> <20251017115006.2696991-2-kraxel@redhat.com> Date: Wed, 22 Oct 2025 07:55:16 +0200 Message-ID: <87plafiipn.fsf@pond.sub.org> User-Agent: Gnus/5.13 (Gnus v5.13) MIME-Version: 1.0 Content-Type: text/plain X-Scanned-By: MIMEDefang 3.4.1 on 10.30.177.93 Received-SPF: pass client-ip=170.10.129.124; envelope-from=armbru@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H3=0.001, RCVD_IN_MSPIKE_WL=0.001, RCVD_IN_VALIDITY_RPBL_BLOCKED=0.001, RCVD_IN_VALIDITY_SAFE_BLOCKED=0.001, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Gerd Hoffmann writes: > Starting with the edk2-stable202508 tag OVMF (and ArmVirt too) have > optional support for logging to a memory buffer. There is guest side > support -- for example in linux kernels v6.17+ -- to read that buffer. > But that might not helpful if your guest stops booting early enough that > guest tooling can not be used yet. So host side support to read that > log buffer is a useful thing to have. > > This patch implements the query-firmware-log qmp monitor command to > read the firmware log. > > Signed-off-by: Gerd Hoffmann Reviewed-by: Markus Armbruster