From: Zhao Liu <zhao1....@intel.com> The legacy_l2_cache (2nd-level cache: 4 MByte, 16-way set associative, 64 byte line size) corresponds to descriptor 0x49, but at present cpuid2_cache_descriptors doesn't support descriptor 0x49 because it has multiple meanings.
The 0x49 is necessary when CPUID 0x2 and 0x4 leaves have the consistent cache model, and use legacy_l2_cache as the default L2 cache. Therefore, add descriptor 0x49 to represent general L2 cache. Reviewed-by: Dapeng Mi <dapeng1...@linux.intel.com> Tested-by: Yi Lai <yi1....@intel.com> Signed-off-by: Zhao Liu <zhao1....@intel.com> Link: https://lore.kernel.org/r/20250711102143.1622339-3-zhao1....@intel.com Signed-off-by: Paolo Bonzini <pbonz...@redhat.com> --- target/i386/cpu.c | 13 ++++++++++++- 1 file changed, 12 insertions(+), 1 deletion(-) diff --git a/target/i386/cpu.c b/target/i386/cpu.c index f107e586734..4386b60ff6c 100644 --- a/target/i386/cpu.c +++ b/target/i386/cpu.c @@ -129,7 +129,18 @@ struct CPUID2CacheDescriptorInfo cpuid2_cache_descriptors[] = { .associativity = 8, .line_size = 64, }, [0x48] = { .level = 2, .type = UNIFIED_CACHE, .size = 3 * MiB, .associativity = 12, .line_size = 64, }, - /* Descriptor 0x49 depends on CPU family/model, so it is not included */ + /* + * Descriptor 0x49 has 2 cases: + * - 2nd-level cache: 4 MByte, 16-way set associative, 64 byte line size. + * - 3rd-level cache: 4MB, 16-way set associative, 64-byte line size + * (Intel Xeon processor MP, Family 0FH, Model 06H). + * + * When it represents L3, then it depends on CPU family/model. Fortunately, + * the legacy cache/CPU models don't have such special L3. So, just add it + * to represent the general L2 case. + */ + [0x49] = { .level = 2, .type = UNIFIED_CACHE, .size = 4 * MiB, + .associativity = 16, .line_size = 64, }, [0x4A] = { .level = 3, .type = UNIFIED_CACHE, .size = 6 * MiB, .associativity = 12, .line_size = 64, }, [0x4B] = { .level = 3, .type = UNIFIED_CACHE, .size = 8 * MiB, -- 2.50.0
