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bh=EG8cZI98ZOM0QjlQOmrqhILQJn7/3KTuPiOq/eLp4m8=; b=BI9un+tZxaJCTPgjb/F4yhXkVSkLWcE8tPxOJczRp8C2W4GdQqs+LDDg43Hnuf9LynPaVAcgzwgJI6XjYSVSGawMc8z/dlJMo8R/NeMLvmJcveeDMvvvIGtGlqgwOWVUA+DlQ0q9q0bN9cYwFQZhHmHXnSer2ZMqlrm0S663YH4= X-MS-Exchange-Authentication-Results: spf=pass (sender IP is 165.204.84.17) smtp.mailfrom=amd.com; dkim=none (message not signed) header.d=none;dmarc=pass action=none header.from=amd.com; Received-SPF: Pass (protection.outlook.com: domain of amd.com designates 165.204.84.17 as permitted sender) receiver=protection.outlook.com; client-ip=165.204.84.17; helo=satlexmb07.amd.com; pr=C MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="UTF-8" Date: Wed, 11 Mar 2026 13:43:48 +0100 Message-ID: Subject: Re: [PATCH v3 1/4] x86: Reject CPU policies with vendors other than the host's From: Alejandro Vallejo To: Jan Beulich CC: Oleksii Kurochko , Community Manager , Andrew Cooper , =?utf-8?q?Roger_Pau_Monn=C3=A9?= , Anthony PERARD , X-Mailer: aerc 0.20.1 References: <20260213114232.42996-1-alejandro.garciavallejo@amd.com> <20260213114232.42996-2-alejandro.garciavallejo@amd.com> <8ba61374-f05e-45d9-b1b2-0140edbb34a6@suse.com> In-Reply-To: <8ba61374-f05e-45d9-b1b2-0140edbb34a6@suse.com> X-Originating-IP: [10.180.168.240] X-ClientProxiedBy: satlexmb07.amd.com (10.181.42.216) To satlexmb07.amd.com (10.181.42.216) X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: CY4PEPF0000EE30:EE_|SA5PPF7D510B798:EE_ X-MS-Office365-Filtering-Correlation-Id: c4063f4b-cc07-4e68-f80d-08de7f6bd90e X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|82310400026|376014|1800799024|36860700016|22082099003|56012099003|18002099003|13003099007; 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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: RX/FnzcBSKbmZV/YSMsYrZ98NcXaHqn40PVT8jDTAP+a4C2VMGKyYta1Z1QGHcfUP06htAqKrIhy1GqWb+pf//pWVdDmbZ/fYffbsW6oL9TAqeSxRVAGSLcg+27d4GsEc/aoTcbLETex//QsLhTGodlgKhEd8APa1kRdgf+aem12stNP+UNbgtBOvHKDq/lXLC0JyuDY3CunJ3PtkApvJ8Bx56ebDM+qc3wvz1/+gAWP5hl6EPT5UBKh6R5NJrbfv4cwwW/5l2eTC8860nu6eCI2yXLHNWi1bWJXq0mgFdNAKz0h2iD3EkTqI6DXId4xhKObQIGJmVvZC/YUA/QFECH88/lp0hfCoQIbt2MfG7+LiMfWporWYgWwFCdJb/W4bBoOsPt/C3h9EIxJjrEYow0UU77fO/T+m7gW69I6BuuXpfe0HA8M1o13305v7L0N X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 11 Mar 2026 12:43:51.2185 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: c4063f4b-cc07-4e68-f80d-08de7f6bd90e X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=3dd8961f-e488-4e60-8e11-a82d994e183d;Ip=[165.204.84.17];Helo=[satlexmb07.amd.com] X-MS-Exchange-CrossTenant-AuthSource: CY4PEPF0000EE30.namprd05.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: SA5PPF7D510B798 On Wed Mar 11, 2026 at 9:26 AM CET, Jan Beulich wrote: > On 13.02.2026 12:42, Alejandro Vallejo wrote: >> --- a/CHANGELOG.md >> +++ b/CHANGELOG.md >> @@ -22,6 +22,11 @@ The format is based on [Keep a Changelog](https://kee= pachangelog.com/en/1.0.0/) >> - Xenoprofile support. Oprofile themselves removed support for Xen = in 2014 >> prior to the version 1.0 release, and there has been no developmen= t since >> before then in Xen. >> + - Domains can no longer run on a CPU vendor if they were initially l= aunched >> + on a different CPU vendor. This affects live migrations and save/r= estore >> + workflows accross mixed-vendor hosts. Cross-vendor emulation has a= lways >> + been unreliable, but since 2017 with the advent of speculation sec= urity it >> + became unsustainably so. > > While the code adjustment looks okay to me, the wording is a little odd. = What is > "run on a CPU vendor"? How about "Domains can no longer run on a system w= ith CPUs > of a vendor different from the one they were initially launched on"? > > Also, nit: "across". Sure Cheers, Alejandro