From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail02.groups.io (mail02.groups.io [66.175.222.108]) by spool.mail.gandi.net (Postfix) with ESMTPS id D9293740053 for ; Wed, 28 Feb 2024 08:54:35 +0000 (UTC) DKIM-Signature: a=rsa-sha256; bh=V9E+tNFPxTBRjb6JDglLucv9WM/ZlOg52m1bH9afu8o=; c=relaxed/simple; d=groups.io; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version:In-Reply-To:Precedence:List-Subscribe:List-Help:Sender:List-Id:Mailing-List:Delivered-To:Reply-To:List-Unsubscribe-Post:List-Unsubscribe:Content-Type:Content-Disposition; s=20140610; t=1709110474; v=1; b=KPn6RlRDjQyCG16PJbBQleurB4Qd/bxdbz7Y8q0zm1N7N8t9SdZQW1yi6GcDXW0liWpkl4GC nz/6UhPiyrwPMk3973gfiKfarreK/v4hD3r9x2lX51vcBCsGobAoLeAGZOa3q/9ly1w8YL9/b0L O/ZACkq/2/Q5cA7sKGiM+o7E= X-Received: by 127.0.0.2 with SMTP id xPVdYY7687511xfAMQr2eGhH; Wed, 28 Feb 2024 00:54:34 -0800 X-Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) by mx.groups.io with SMTP id smtpd.web10.9291.1709110473929253405 for ; Wed, 28 Feb 2024 00:54:34 -0800 X-Received: from mimecast-mx02.redhat.com (mimecast-mx02.redhat.com [66.187.233.88]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-594-gzYHNhYjMGObp1jOuyP8LA-1; Wed, 28 Feb 2024 03:54:29 -0500 X-MC-Unique: gzYHNhYjMGObp1jOuyP8LA-1 X-Received: from smtp.corp.redhat.com (int-mx07.intmail.prod.int.rdu2.redhat.com [10.11.54.7]) (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 mimecast-mx02.redhat.com (Postfix) with ESMTPS id 1DA61108BFCF; Wed, 28 Feb 2024 08:54:29 +0000 (UTC) X-Received: from sirius.home.kraxel.org (unknown [10.39.192.249]) by smtp.corp.redhat.com (Postfix) with ESMTPS id E72131C060AF; Wed, 28 Feb 2024 08:54:28 +0000 (UTC) X-Received: by sirius.home.kraxel.org (Postfix, from userid 1000) id D35F71801480; Wed, 28 Feb 2024 09:54:27 +0100 (CET) Date: Wed, 28 Feb 2024 09:54:27 +0100 From: "Gerd Hoffmann" To: Tom Lendacky Cc: devel@edk2.groups.io, Ard Biesheuvel , Erdem Aktas , Jiewen Yao , Laszlo Ersek , Liming Gao , Michael D Kinney , Min Xu , Zhiguang Liu , Rahul Kumar , Ray Ni , Michael Roth Subject: Re: [edk2-devel] [PATCH v2 22/23] Ovmfpkg/CcExitLib: Provide SVSM discovery support Message-ID: <6gpjzqmtwll47p4cdxogz2pnyyeikmp5sohywdtgwdcsejj6gl@qfde6jroqhrf> References: <806aee9c79e2c996b19795d44859adbc10f94b43.1708623001.git.thomas.lendacky@amd.com> MIME-Version: 1.0 In-Reply-To: <806aee9c79e2c996b19795d44859adbc10f94b43.1708623001.git.thomas.lendacky@amd.com> X-Scanned-By: MIMEDefang 3.4.1 on 10.11.54.7 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Precedence: Bulk List-Subscribe: List-Help: Sender: devel@edk2.groups.io List-Id: Mailing-List: list devel@edk2.groups.io; contact devel+owner@edk2.groups.io Reply-To: devel@edk2.groups.io,kraxel@redhat.com List-Unsubscribe-Post: List-Unsubscribe=One-Click List-Unsubscribe: X-Gm-Message-State: S1nMtT5blIRShPfd0xXw3w85x7686176AA= Content-Type: text/plain; charset=us-ascii Content-Disposition: inline X-GND-Status: LEGIT Authentication-Results: spool.mail.gandi.net; dkim=pass header.d=groups.io header.s=20140610 header.b=KPn6RlRD; dmarc=fail reason="SPF not aligned (relaxed), DKIM not aligned (relaxed)" header.from=redhat.com (policy=none); spf=pass (spool.mail.gandi.net: domain of bounce@groups.io designates 66.175.222.108 as permitted sender) smtp.mailfrom=bounce@groups.io On Thu, Feb 22, 2024 at 11:30:01AM -0600, Tom Lendacky wrote: > BZ: https://bugzilla.tianocore.org/show_bug.cgi?id=4654 > > The SVSM specification documents an alternative method of discovery for > the SVSM using a reserved CPUID bit and a reserved MSR. > > For the CPUID support, the #VC handler of an SEV-SNP guest should modify > the returned value in the EAX register for the 0x8000001f CPUID function > by setting bit 28 when an SVSM is present. > > For the MSR support, new reserved MSR 0xc001f000 has been defined. A #VC > should be generated when accessing this MSR. The #VC handler is expected > to ignore writes to this MSR and return the physical calling area address > (CAA) on reads of this MSR. > > Signed-off-by: Tom Lendacky Acked-by: Gerd Hoffmann -=-=-=-=-=-=-=-=-=-=-=- Groups.io Links: You receive all messages sent to this group. View/Reply Online (#116109): https://edk2.groups.io/g/devel/message/116109 Mute This Topic: https://groups.io/mt/104512981/7686176 Group Owner: devel+owner@edk2.groups.io Unsubscribe: https://edk2.groups.io/g/devel/unsub [rebecca@openfw.io] -=-=-=-=-=-=-=-=-=-=-=-