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Wed, 12 Nov 2025 07:30:50 +0000 Date: Wed, 12 Nov 2025 15:30:38 +0800 From: Chao Gao To: "Xin Li (Intel)" CC: , , , , , , , , , , , , , , , , Subject: Re: [PATCH v9 17/22] KVM: x86: Advertise support for FRED Message-ID: References: <20251026201911.505204-1-xin@zytor.com> <20251026201911.505204-18-xin@zytor.com> Content-Type: text/plain; charset="us-ascii" Content-Disposition: inline In-Reply-To: <20251026201911.505204-18-xin@zytor.com> X-ClientProxiedBy: SG2P153CA0036.APCP153.PROD.OUTLOOK.COM (2603:1096:4:c7::23) To CH3PR11MB8660.namprd11.prod.outlook.com (2603:10b6:610:1ce::13) Precedence: bulk X-Mailing-List: linux-doc@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: CH3PR11MB8660:EE_|DS7PR11MB8853:EE_ X-MS-Office365-Filtering-Correlation-Id: fcc6f062-c2a8-4e3f-fa9f-08de21bd6762 X-LD-Processed: 46c98d88-e344-4ed4-8496-4ed7712e255d,ExtAddr X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|7416014|376014|366016|1800799024|7053199007; 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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: =?us-ascii?Q?sSXvJNmwjRhPHxr2/L/CXiuV6AstVqQ/HZ0nz5BLHsmQq1ARr7/RaLUzLzR+?= =?us-ascii?Q?Jh0zYtx6lZYr6sKQZjkvMsgKoJWmXP3p4rvI0oHMd9EDYAX69UxfToyB5jvt?= =?us-ascii?Q?bkzpMwNu9sCW6DEPC0kHWJPhL1oOEaxJs6puORUYRsN54+eFsnLo88iEPSTI?= =?us-ascii?Q?7ALRWXHkjKNuF3cAg9BJsnmamdY2UsqTNFrIWiK+e42uCuFhZeIunEowHJ7Y?= =?us-ascii?Q?laiukCTxRXG6/3gY8ncSNW7oGdPfqZXGP0EVGNvVBvrCU3sXbVPPOFpqUFfT?= =?us-ascii?Q?CGPrmBzbvyPHxEklITOkhLnBYGG1lSNp2X+yfuTvMn2TQGYNpeY317TmHc+m?= =?us-ascii?Q?w/wODOWMKxpNx9EaSfieEsi/nZpk5XfoUzChMb0A1ENIb6GbGRdmSoDbR4lu?= =?us-ascii?Q?Ktz+mX/BptBDa5bR09wiDd4i3CkSPjmAWrn/FvBGCMB4QVJMFgFBxnw+rMFW?= =?us-ascii?Q?YpQsj1UhwUOnoKENlRHx3Nh5/a4mu3lNkplVdEfznaXNOl8XL+rxfmMTj36z?= =?us-ascii?Q?GKlDIbXtxI49zL5Td+b+5pcpnC14oKp/nllBMm2aMNhBBmTmIumEFCxWA00G?= =?us-ascii?Q?lPVJkbSRzvqNDpTIrFXLe3JF/lij2Q+uf0WU2aMiVFtG69yQsaTudgZHQSuF?= =?us-ascii?Q?gR6cand5/yBNW8qXsfTwtRTHd7tP02wsgiz40paMQDlT18SRTXgvYzdd8Tjo?= =?us-ascii?Q?qI1MIOPDrNocBpscc3e7dvtnQFmqpeOV5xH/4oiuKSFoN8UBxqcQZEr+Vifj?= =?us-ascii?Q?2QsNexz/vAEWaDowyQbQuTSOzMx9IzkwnXJSLxAKkWwAKYP1SRdU0FntSbqw?= =?us-ascii?Q?+i4RhvIAQ1UGXxOBXmxkLt19TVUCF3sCovgvk2hDuUzcD4WtJm1ZxEj1eYce?= =?us-ascii?Q?QEq5U56rJFqhFyeOenb/5gNzo+oECejvkAF7oqpBgQAeKFIaNSAxXT+pXSNn?= =?us-ascii?Q?eHXr/jlJD4X15fiSBNmvSyHucV71t2VdrILyK3/bjUENcEL8DEFOEfYoBz32?= =?us-ascii?Q?CeEczMNfcjG0OGHzZTa6tk4AWPJWhFi4L6CquA+TTUlZXeIBA0nyMBN8hM2Z?= =?us-ascii?Q?x/vKodBncnHjY23cmkcvTDJivIDGB0PLSEhdXtg3og8OdrWpxdjHbhdiV5xu?= =?us-ascii?Q?8BmzM/k0pNaHcRIsFWMKtk+i+HCXuYi0cauyD/D9JisMf2ZX2wbbW8evqYrb?= =?us-ascii?Q?5NB7FzaZfJiZaC/qymrcY8qcBwe6n9qDFk4swbv6uLVm+Q7W8Rh+BRERV1v5?= =?us-ascii?Q?1rIXT10SzW5mWZgkwFm0zQ90ju7oloyTKLsDxCpKtNyMFdMO+3DvsTxBp5nP?= =?us-ascii?Q?4Xku1GIgjrJiR6fhuphpdf7ajCD8+A4oZyuKfZKF6AU+r3NZa/YS7b7s902V?= =?us-ascii?Q?Y3XdfNHmMv4jqdTZ/9KHxTVnfjYeaxZJbfJ1f++nffDEbL8jHNnI+GDVNzkz?= =?us-ascii?Q?VF37xEwmUptdXRz/Y4QgSDVB7yFH9sX4Z1QBS8Qy83OKeqoWtuf3+2vdzYTe?= =?us-ascii?Q?2Qyqg7Z44Oelu+VT8xPmaR/TiIleWC/OxKQwbLmkwDQAwnQgrqha90RbzTEm?= =?us-ascii?Q?LfPJc7QRZJwIhFR3BS0OS0xUvXoIOqx8kGod7YCm?= X-MS-Exchange-CrossTenant-Network-Message-Id: fcc6f062-c2a8-4e3f-fa9f-08de21bd6762 X-MS-Exchange-CrossTenant-AuthSource: CH3PR11MB8660.namprd11.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 12 Nov 2025 07:30:50.1671 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 46c98d88-e344-4ed4-8496-4ed7712e255d X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: miKjGl7/cgHEEn600IK8X8RkGk1iMIZoWj6x51jYnu1UhZ5B0nEVmG0fRRKPG3Pmo+QzGrt2kiH/vtVCqJLIgg== X-MS-Exchange-Transport-CrossTenantHeadersStamped: DS7PR11MB8853 X-OriginatorOrg: intel.com On Sun, Oct 26, 2025 at 01:19:05PM -0700, Xin Li (Intel) wrote: >From: Xin Li > >Advertise support for FRED to userspace after changes required to enable >FRED in a KVM guest are in place. I'm not sure if AMD CPUs support FRED, but just in case, we can clear FRED i.e., kvm_cpu_cap_clear(X86_FEATURE_FRED) in svm_set_cpu_caps(). With this fixed: Reviewed-by: Chao Gao > >Signed-off-by: Xin Li >Signed-off-by: Xin Li (Intel) >Tested-by: Shan Kang >Tested-by: Xuelian Guo >--- > >Change in v5: >* Don't advertise FRED/LKGS together, LKGS can be advertised as an > independent feature (Sean). >* Add TB from Xuelian Guo. >--- > arch/x86/kvm/cpuid.c | 1 + > 1 file changed, 1 insertion(+) > >diff --git a/arch/x86/kvm/cpuid.c b/arch/x86/kvm/cpuid.c >index d563a948318b..0bf97b8a3216 100644 >--- a/arch/x86/kvm/cpuid.c >+++ b/arch/x86/kvm/cpuid.c >@@ -1014,6 +1014,7 @@ void kvm_set_cpu_caps(void) > F(FSRS), > F(FSRC), > F(WRMSRNS), >+ X86_64_F(FRED), > X86_64_F(LKGS), > F(AMX_FP16), > F(AVX_IFMA), >-- >2.51.0 >