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Ip=[165.204.84.17]; Helo=[satlexmb07.amd.com] X-MS-Exchange-CrossTenant-AuthSource: CH1PEPF0000A347.namprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: SA1PR12MB7318 Received-SPF: permerror client-ip=2a01:111:f403:c107::1; envelope-from=Benjamin.Cheatham@amd.com; helo=PH8PR06CU001.outbound.protection.outlook.com X-Spam_score_int: -24 X-Spam_score: -2.5 X-Spam_bar: -- X-Spam_report: (-2.5 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.445, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-Mailman-Approved-At: Tue, 30 Jun 2026 11:40:28 -0400 X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: qemu development 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 From: Nikunj A Dadhania Add the AVX512 Bit Matrix Multiply feature flag at CPUID leaf 0x80000021_EAX[23], enabling guests to detect and use BMM instructions for accelerated bit matrix multiply operations. Add the "avx512-bmm" feature name to allow QEMU to expose this capability when available on the host. avx512-bmm: AVX512 Bit Matrix Multiply instruction Signed-off-by: Nikunj A Dadhania Signed-off-by: Ben Cheatham --- target/i386/cpu.c | 2 +- target/i386/cpu.h | 2 ++ 2 files changed, 3 insertions(+), 1 deletion(-) diff --git a/target/i386/cpu.c b/target/i386/cpu.c index 8929a75c7c92..a85cc67700fa 100644 --- a/target/i386/cpu.c +++ b/target/i386/cpu.c @@ -1434,7 +1434,7 @@ FeatureWordInfo feature_word_info[FEATURE_WORDS] = { "auto-ibrs", NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, - "prefetchi", NULL, NULL, NULL, + "prefetchi", NULL, NULL, "avx512-bmm", "eraps", NULL, NULL, "sbpb", "ibpb-brtype", "srso-no", "srso-user-kernel-no", NULL, }, diff --git a/target/i386/cpu.h b/target/i386/cpu.h index 67e2ecf32517..e66333cd9c24 100644 --- a/target/i386/cpu.h +++ b/target/i386/cpu.h @@ -1200,6 +1200,8 @@ uint64_t x86_cpu_get_supported_feature_word(X86CPU *cpu, FeatureWord w); #define CPUID_8000_0021_EAX_AUTO_IBRS (1U << 8) /* Indicates support for IC prefetch */ #define CPUID_8000_0021_EAX_PREFETCHI (1U << 20) +/* AVX512 Bit Matrix Multiply (BMM) instruction support */ +#define CPUID_8000_0021_EAX_AVX512_BMM (1U << 23) /* Enhanced Return Address Predictor Scurity */ #define CPUID_8000_0021_EAX_ERAPS (1U << 24) /* Selective Branch Predictor Barrier */ -- 2.53.0