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X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 28 Feb 2025 18:07:47.2360 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 44748ea4-78c1-43f2-77a3-08dd5822ce8c 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=[SATLEXMB04.amd.com] X-MS-Exchange-CrossTenant-AuthSource: CY4PEPF0000EE3B.namprd03.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: DS0PR12MB8245 Add the CPUID bit indicates that a WRMSR to MSR_FS_BASE, MSR_GS_BASE, or MSR_KERNEL_GS_BASE is non-serializing. CPUID_Fn80000021_EAX Bit Feature description 1 FsGsKernelGsBaseNonSerializing. WRMSR to FS_BASE, GS_BASE and KernelGSbase are non-serializing. Link: https://www.amd.com/content/dam/amd/en/documents/epyc-technical-docs/programmer-references/57238.zip Signed-off-by: Babu Moger Reviewed-by: Maksim Davydov Reviewed-by: Zhao Liu --- 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 a5427620d0..7a5c5da0f1 100644 --- a/target/i386/cpu.c +++ b/target/i386/cpu.c @@ -1234,7 +1234,7 @@ FeatureWordInfo feature_word_info[FEATURE_WORDS] = { [FEAT_8000_0021_EAX] = { .type = CPUID_FEATURE_WORD, .feat_names = { - "no-nested-data-bp", NULL, "lfence-always-serializing", NULL, + "no-nested-data-bp", "fs-gs-base-ns", "lfence-always-serializing", NULL, NULL, NULL, "null-sel-clr-base", NULL, "auto-ibrs", NULL, NULL, NULL, NULL, NULL, NULL, NULL, diff --git a/target/i386/cpu.h b/target/i386/cpu.h index c67b42d34f..968b4fd99b 100644 --- a/target/i386/cpu.h +++ b/target/i386/cpu.h @@ -1074,6 +1074,8 @@ uint64_t x86_cpu_get_supported_feature_word(X86CPU *cpu, FeatureWord w); /* Processor ignores nested data breakpoints */ #define CPUID_8000_0021_EAX_NO_NESTED_DATA_BP (1U << 0) +/* WRMSR to FS_BASE, GS_BASE, or KERNEL_GS_BASE is non-serializing */ +#define CPUID_8000_0021_EAX_FS_GS_BASE_NS (1U << 1) /* LFENCE is always serializing */ #define CPUID_8000_0021_EAX_LFENCE_ALWAYS_SERIALIZING (1U << 2) /* Null Selector Clears Base */