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x86/cpu: Add cpu_type to struct x86_cpu_id

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In addition to matching vendor/family/model/feature, for hybrid variants it is
required to also match cpu-type. For example, some CPU vulnerabilities like
RFDS only affect a specific cpu-type.

To be able to also match CPUs based on their type, add a new field "type" to
struct x86_cpu_id which is used by the CPU-matching tables. Introduce
X86_CPU_TYPE_ANY for the cases that don't care about the cpu-type.

  [ bp: Massage commit message. ]

Signed-off-by: Pawan Gupta <pawan.kumar.gupta@linux.intel.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Acked-by: Dave Hansen <dave.hansen@linux.intel.com>
Link: https://lore.kernel.org/r/20250311-add-cpu-type-v8-3-e8514dcaaff2@linux.intel.com
This commit is contained in:
Pawan Gupta
2025-03-11 08:02:36 -07:00
committed by Ingo Molnar
parent c3390406ad
commit 00d7fc04b7
2 changed files with 25 additions and 9 deletions
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2
include/linux/mod_devicetable.h
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@@ -692,6 +692,7 @@ struct x86_cpu_id {
__u16 feature; /* bit index */
/* Solely for kernel-internal use: DO NOT EXPORT to userspace! */
__u16 flags;
__u8 type;
kernel_ulong_t driver_data;
};
@@ -703,6 +704,7 @@ struct x86_cpu_id {
#define X86_STEP_MIN 0
#define X86_STEP_MAX 0xf
#define X86_FEATURE_ANY 0 /* Same as FPU, you can't test for that */
#define X86_CPU_TYPE_ANY 0
/*
* Generic table type for matching CPU features.