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Message-ID: <20250305-add-cpu-type-v6-2-4741735bcd75@linux.intel.com>
Date: Wed, 5 Mar 2025 23:13:03 -0800
From: Pawan Gupta <pawan.kumar.gupta@...ux.intel.com>
To: Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...hat.com>,
Borislav Petkov <bp@...en8.de>,
Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org
Cc: daniel.sneddon@...ux.intel.com, tony.luck@...el.com,
linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org,
linux-perf-users@...r.kernel.org,
Josh Poimboeuf <jpoimboe@...nel.org>,
Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>,
"Rafael J. Wysocki" <rafael@...nel.org>,
Ricardo Neri <ricardo.neri-calderon@...ux.intel.com>,
"Liang, Kan" <kan.liang@...ux.intel.com>,
Andrew Cooper <andrew.cooper3@...rix.com>,
Brice Goglin <brice.goglin@...il.com>,
Mario Limonciello <mario.limonciello@....com>,
Perry Yuan <Perry.Yuan@....com>,
Dapeng Mi <dapeng1.mi@...ux.intel.com>
Subject: [PATCH v6 2/5] x86/cpu: Add cpu_type to struct x86_cpu_id
In addition to matching vendor/family/model/feature, for hybrid variants it
is required to also match cpu-type also. For example some CPU
vulnerabilities like RFDS only affects a specific cpu-type.
To be able to also match CPUs based on their type, add a new field cpu_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.
Acked-by: Dave Hansen <dave.hansen@...ux.intel.com>
Signed-off-by: Pawan Gupta <pawan.kumar.gupta@...ux.intel.com>
---
arch/x86/include/asm/cpu_device_id.h | 34 ++++++++++++++++++++++++----------
include/linux/mod_devicetable.h | 2 ++
2 files changed, 26 insertions(+), 10 deletions(-)
diff --git a/arch/x86/include/asm/cpu_device_id.h b/arch/x86/include/asm/cpu_device_id.h
index bb5acba69bd1..20dd91146e75 100644
--- a/arch/x86/include/asm/cpu_device_id.h
+++ b/arch/x86/include/asm/cpu_device_id.h
@@ -74,13 +74,14 @@
* into another macro at the usage site for good reasons, then please
* start this local macro with X86_MATCH to allow easy grepping.
*/
-#define X86_MATCH_CPU(_vendor, _family, _model, _steppings, _feature, _data) { \
+#define X86_MATCH_CPU(_vendor, _family, _model, _steppings, _feature, _cpu_type, _data) { \
.vendor = _vendor, \
.family = _family, \
.model = _model, \
.steppings = _steppings, \
.feature = _feature, \
.flags = X86_CPU_ID_FLAG_ENTRY_VALID, \
+ .cpu_type = _cpu_type, \
.driver_data = (unsigned long) _data \
}
@@ -97,7 +98,7 @@
*/
#define X86_MATCH_VENDOR_FAM_MODEL_FEATURE(vendor, family, model, feature, data) \
X86_MATCH_CPU(X86_VENDOR_##vendor, family, model, X86_STEPPING_ANY, \
- feature, data)
+ feature, X86_CPU_TYPE_ANY, data)
/**
* X86_MATCH_VENDOR_FAM_FEATURE - Macro for matching vendor, family and CPU feature
@@ -111,7 +112,7 @@
*/
#define X86_MATCH_VENDOR_FAM_FEATURE(vendor, family, feature, data) \
X86_MATCH_CPU(X86_VENDOR_##vendor, family, X86_MODEL_ANY, \
- X86_STEPPING_ANY, feature, data)
+ X86_STEPPING_ANY, feature, X86_CPU_TYPE_ANY, data)
/**
* X86_MATCH_VENDOR_FEATURE - Macro for matching vendor and CPU feature
@@ -124,7 +125,7 @@
*/
#define X86_MATCH_VENDOR_FEATURE(vendor, feature, data) \
X86_MATCH_CPU(X86_VENDOR_##vendor, X86_FAMILY_ANY, X86_MODEL_ANY, \
- X86_STEPPING_ANY, feature, data)
+ X86_STEPPING_ANY, feature, X86_CPU_TYPE_ANY, data)
/**
* X86_MATCH_FEATURE - Macro for matching a CPU feature
@@ -135,7 +136,7 @@
*/
#define X86_MATCH_FEATURE(feature, data) \
X86_MATCH_CPU(X86_VENDOR_ANY, X86_FAMILY_ANY, X86_MODEL_ANY, \
- X86_STEPPING_ANY, feature, data)
+ X86_STEPPING_ANY, feature, X86_CPU_TYPE_ANY, data)
/**
* X86_MATCH_VENDOR_FAM_MODEL - Match vendor, family and model
@@ -149,7 +150,7 @@
*/
#define X86_MATCH_VENDOR_FAM_MODEL(vendor, family, model, data) \
X86_MATCH_CPU(X86_VENDOR_##vendor, family, model, X86_STEPPING_ANY, \
- X86_FEATURE_ANY, data)
+ X86_FEATURE_ANY, X86_CPU_TYPE_ANY, data)
/**
* X86_MATCH_VENDOR_FAM - Match vendor and family
@@ -162,7 +163,7 @@
*/
#define X86_MATCH_VENDOR_FAM(vendor, family, data) \
X86_MATCH_CPU(X86_VENDOR_##vendor, family, X86_MODEL_ANY, \
- X86_STEPPING_ANY, X86_FEATURE_ANY, data)
+ X86_STEPPING_ANY, X86_FEATURE_ANY, X86_CPU_TYPE_ANY, data)
/**
* X86_MATCH_VFM - Match encoded vendor/family/model
@@ -173,7 +174,7 @@
*/
#define X86_MATCH_VFM(vfm, data) \
X86_MATCH_CPU(VFM_VENDOR(vfm), VFM_FAMILY(vfm), VFM_MODEL(vfm), \
- X86_STEPPING_ANY, X86_FEATURE_ANY, data)
+ X86_STEPPING_ANY, X86_FEATURE_ANY, X86_CPU_TYPE_ANY, data)
#define __X86_STEPPINGS(mins, maxs) GENMASK(maxs, mins)
/**
@@ -186,7 +187,8 @@
*/
#define X86_MATCH_VFM_STEPS(vfm, min_step, max_step, data) \
X86_MATCH_CPU(VFM_VENDOR(vfm), VFM_FAMILY(vfm), VFM_MODEL(vfm), \
- __X86_STEPPINGS(min_step, max_step), X86_FEATURE_ANY, data)
+ __X86_STEPPINGS(min_step, max_step), X86_FEATURE_ANY, \
+ X86_CPU_TYPE_ANY, data)
/**
* X86_MATCH_VFM_FEATURE - Match encoded vendor/family/model/feature
@@ -198,7 +200,19 @@
*/
#define X86_MATCH_VFM_FEATURE(vfm, feature, data) \
X86_MATCH_CPU(VFM_VENDOR(vfm), VFM_FAMILY(vfm), VFM_MODEL(vfm), \
- X86_STEPPING_ANY, feature, data)
+ X86_STEPPING_ANY, feature, X86_CPU_TYPE_ANY, data)
+
+/**
+ * X86_MATCH_VFM_CPU_TYPE - Match encoded vendor/family/model/cpu-type
+ * @vfm: Encoded 8-bits each for vendor, family, model
+ * @cpu_type: CPU type e.g. P-core, E-core on Intel
+ * @data: Driver specific data or NULL. The internal storage
+ * format is unsigned long. The supplied value, pointer
+ * etc. is cast to unsigned long internally.
+ */
+#define X86_MATCH_VFM_CPU_TYPE(vfm, cpu_type, data) \
+ X86_MATCH_CPU(VFM_VENDOR(vfm), VFM_FAMILY(vfm), VFM_MODEL(vfm), \
+ X86_STEPPING_ANY, X86_FEATURE_ANY, cpu_type, data)
extern const struct x86_cpu_id *x86_match_cpu(const struct x86_cpu_id *match);
extern bool x86_match_min_microcode_rev(const struct x86_cpu_id *table);
diff --git a/include/linux/mod_devicetable.h b/include/linux/mod_devicetable.h
index d67614f7b7f1..18e996acb49a 100644
--- a/include/linux/mod_devicetable.h
+++ b/include/linux/mod_devicetable.h
@@ -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 cpu_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.
--
2.34.1
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