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client-ip=165.204.84.17; helo=satlexmb07.amd.com; pr=C Received: from satlexmb07.amd.com (165.204.84.17) by DS1PEPF0001709D.mail.protection.outlook.com (10.167.18.107) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.21.315.6 via Frontend Transport; Thu, 6 Aug 2026 20:12:19 +0000 Received: from [10.236.30.85] (10.180.168.240) by satlexmb07.amd.com (10.181.42.216) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.2562.41; Thu, 6 Aug 2026 15:12:18 -0500 Message-ID: <9e5183be-1f31-4f6a-8b91-0f9a92590241@amd.com> Date: Thu, 6 Aug 2026 15:12:12 -0500 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v4 01/10] x86/bugs: Only log missing retpoline when it's actually the missing mitigation To: Borislav Petkov CC: , , , , Sean Christopherson , Paolo Bonzini , K Prateek Nayak , Nikunj A Dadhania , Tom Lendacky , Michael Roth , Naveen Rao , David Kaplan , Pawan Gupta , Dave Hansen References: <20260804235611.4053375-1-kim.phillips@amd.com> <20260804235611.4053375-2-kim.phillips@amd.com> <20260805004441.GAanKHecgJwfAOzZzp@fat_crate.local> <65d82937-113d-405b-9399-b70973e84c50@amd.com> <20260805224907.GDanO942iYDbai1kFx@fat_crate.local> Content-Language: en-US From: Kim Phillips In-Reply-To: <20260805224907.GDanO942iYDbai1kFx@fat_crate.local> Content-Type: text/plain; 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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: PNsFpoNiut5SAOga6IiU81rveIDF4Jv2WSKQxP7jYOgVdQ+6KnN2SMUdamhcqIti2fRMKgvziJR/pEmc8A2uFNxhmnmqv8l7wtdMeoQcqZCmgDx1NfYDykZfg2VfvKdtg+h2c6XOn8XikKY2dwfMpfynTSGgxzZN7qEoUh1NToR2G+H1+yDxbLUvBE9siXbUGVR94AnXxLdLBL/nTEH4a7U/ZRChLkcTuang23+SUVkz1tpxleF1atR+IqoDGp6uDQG85hxjgk2JKs9ToNkusTsNWWJQSX7COmmhx7tz65X2A0CEnkQkz63kX0M0sJiFWGenhx42xGe1SJreEBdLCKkQRdiSMfCalTB/B9kwt9Tb8aR5vZhM6/uX+swEiLJhWSTZKliBSrc4giaPqi8n1hnmk4XJQm1qod//twgHeXl7RLCdZTSiI+mkaY71cK1H X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 06 Aug 2026 20:12:19.7208 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 35415ab7-2aba-460d-e508-08def3f704e8 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: DS1PEPF0001709D.namprd05.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: PH0PR12MB5607 On 8/5/26 5:49 PM, Borislav Petkov wrote: > On Wed, Aug 05, 2026 at 09:51:11AM -0500, Kim Phillips wrote: >> This patch corrects code that already cares about RETPOLINE=n kernels, but >> it's also useful if you know all the target systems for a RETPOLINE=n config have >> alternatives to RETPOLINE, such as {,e,Auto}IBRS. This will become more and more >> true as time goes by. > Why would more and more configs become relevant which disable > CONFIG_MITIGATION_RETPOLINE? > > What is the compelling use case which warrants to have this in the upstream > kernel? If by 'this' you mean this patch, it's because it fixes a bug with RETPOLINE=n kernels that sashiko found when reviewing the rest of the patches in the series. If by 'this' you mean RETPOLINE=n configurability in general, this patch isn't adding or removing that. Thanks, Kim