[v2][PATCH 0/5] x86/cpu: Remove duplicate microcode version matching infrastructure

[v2][PATCH 0/5] x86/cpu: Remove duplicate microcode version matching infrastructure

[Dave Hansen]

Changes from v1:
 * Fix missing conversion site in i10nm (Boris)
 * Shorten X86_STEPPING_MIN/MAX and helper names (Boris)
 * Fix up changelog typo/thinko reversing struct names (Tony)
 * Move skx_cpuids[] to a non-stepping helper
Changes from RFC:
 * Convert stepping match helpers to always take a range and never
   take a raw stepping bitmap. - Ingo

--

x86 has generic CPU matching infrastructure. This lets you build
tables of CPUs with some property.  It's mostly used for enumerating
model-specific features, but it is quite a bit more flexible than
that. In includes a facility to match steppings and microcode
versions. This generic infrastructure is built around 'struct
x86_cpu_id'.

There is a less generic, parallel CPU matching facility built around
'struct x86_cpu_desc'. It is used only for matching specific microcode
revisions.  All of the 'struct x86_cpu_desc' users can be converted to
'struct x86_cpu_id'.

Do that conversion then remove the 'struct x86_cpu_desc'
infrastructure.

Feedback is getting pretty cosmetic at this point so barring any big
comments on this, I'll probably apply it early next week.

--

 arch/x86/events/intel/core.c         |   62 ++++++++-----------
 arch/x86/include/asm/cpu_device_id.h |   51 ++--------------
 arch/x86/kernel/apic/apic.c          |   18 ++---
 arch/x86/kernel/cpu/amd.c            |    9 +-
 arch/x86/kernel/cpu/common.c         |   78 ++++++++++++-------------
 arch/x86/kernel/cpu/match.c          |   28 +-------
 drivers/edac/i10nm_base.c            |   21 +++---
 drivers/edac/skx_base.c              |    2 
 include/linux/mod_devicetable.h      |    2 
 9 files changed, 105 insertions(+), 166 deletions(-)

[v2][PATCH 1/5] x86/cpu: Introduce new microcode matching helper

[Dave Hansen]

From: Dave Hansen <dave.hansen@linux.intel.com>

The 'x86_cpu_id' and 'x86_cpu_desc' structures are very similar and
need to be consolidated.  There is a microcode version matching
function for 'x86_cpu_desc' but not 'x86_cpu_id'.

Create one for 'x86_cpu_id'.

This essentially just leverages the x86_cpu_id->driver_data field
to replace the less generic x86_cpu_desc->x86_microcode_rev field.

Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com>
---

 b/arch/x86/include/asm/cpu_device_id.h |    1 +
 b/arch/x86/kernel/cpu/match.c          |   11 +++++++++++
 2 files changed, 12 insertions(+)

diff -puN arch/x86/include/asm/cpu_device_id.h~min-ucode-rev arch/x86/include/asm/cpu_device_id.h
--- a/arch/x86/include/asm/cpu_device_id.h~min-ucode-rev	2024-12-13 10:47:30.149045000 -0800
+++ b/arch/x86/include/asm/cpu_device_id.h	2024-12-13 10:47:30.153045160 -0800
@@ -278,5 +278,6 @@ struct x86_cpu_desc {
 
 extern const struct x86_cpu_id *x86_match_cpu(const struct x86_cpu_id *match);
 extern bool x86_cpu_has_min_microcode_rev(const struct x86_cpu_desc *table);
+extern bool x86_match_min_microcode_rev(const struct x86_cpu_id *table);
 
 #endif /* _ASM_X86_CPU_DEVICE_ID */
diff -puN arch/x86/kernel/cpu/match.c~min-ucode-rev arch/x86/kernel/cpu/match.c
--- a/arch/x86/kernel/cpu/match.c~min-ucode-rev	2024-12-13 10:47:30.153045160 -0800
+++ b/arch/x86/kernel/cpu/match.c	2024-12-13 10:47:30.153045160 -0800
@@ -86,3 +86,14 @@ bool x86_cpu_has_min_microcode_rev(const
 	return true;
 }
 EXPORT_SYMBOL_GPL(x86_cpu_has_min_microcode_rev);
+
+bool x86_match_min_microcode_rev(const struct x86_cpu_id *table)
+{
+	const struct x86_cpu_id *res = x86_match_cpu(table);
+
+	if (!res || res->driver_data > boot_cpu_data.microcode)
+		return false;
+
+	return true;
+}
+EXPORT_SYMBOL_GPL(x86_match_min_microcode_rev);
_

[v2][PATCH 2/5] x86/cpu: Expose only stepping min/max interface

[Dave Hansen]

From: Dave Hansen <dave.hansen@linux.intel.com>

The x86_match_cpu() infrastructure can match CPU steppings. Since
there are only 16 possible steppings, the matching infrastructure goes
all out and stores the stepping match as a bitmap. That means it can
match any possible steppings in a single list entry. Fun.

But it exposes this bitmap to each of the X86_MATCH_*() helpers when
none of them really need a bitmap. It makes up for this by exporting a
helper (X86_STEPPINGS()) which converts a contiguous stepping range
into the bitmap which every single user leverages.

Instead of a bitmap, have the main helper for this sort of thing
(X86_MATCH_VFM_STEPS()) just take a stepping range. This ends up
actually being even more compact than before.

Leave the helper in place (renamed to __X86_STEPPINGS()) to make it
more clear what is going on instead of just having a random GENMASK()
in the middle of an already complicated macro.

One oddity that I hit was this macro:

#define VULNBL_INTEL_STEPS(vfm, max_stepping, issues)                 \
       X86_MATCH_VFM_STEPS(vfm, X86_STEPPING_MIN, max_stepping, issues)

It *could* have been converted over to take a min/max stepping value
for each entry. But that would have been a bit too verbose and would
prevent the one oddball in the list (INTEL_COMETLAKE_L stepping 0)
from sticking out.

Instead, just have it take a *maximum* stepping and imply that the match
is from 0=>max_stepping. This is functional for all the cases now and
also retains the nice property of having INTEL_COMETLAKE_L stepping 0
stick out like a sore thumb.

skx_cpuids[] is goofy. It uses the stepping match but encodes all
possible steppings. Just use a normal, non-stepping match helper.

Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com>
Suggested-by: Ingo Molnar <mingo@kernel.org>
---

 b/arch/x86/include/asm/cpu_device_id.h |   15 +++---
 b/arch/x86/kernel/apic/apic.c          |   18 +++----
 b/arch/x86/kernel/cpu/common.c         |   78 ++++++++++++++++-----------------
 b/drivers/edac/i10nm_base.c            |   21 ++++----
 b/drivers/edac/skx_base.c              |    2 
 b/include/linux/mod_devicetable.h      |    2 
 6 files changed, 70 insertions(+), 66 deletions(-)

diff -puN arch/x86/include/asm/cpu_device_id.h~zap-X86_STEPPINGS arch/x86/include/asm/cpu_device_id.h
--- a/arch/x86/include/asm/cpu_device_id.h~zap-X86_STEPPINGS	2024-12-13 10:47:38.281373050 -0800
+++ b/arch/x86/include/asm/cpu_device_id.h	2024-12-13 10:47:38.293373533 -0800
@@ -56,7 +56,6 @@
 /* x86_cpu_id::flags */
 #define X86_CPU_ID_FLAG_ENTRY_VALID	BIT(0)
 
-#define X86_STEPPINGS(mins, maxs)    GENMASK(maxs, mins)
 /**
  * X86_MATCH_VENDOR_FAM_MODEL_STEPPINGS_FEATURE - Base macro for CPU matching
  * @_vendor:	The vendor name, e.g. INTEL, AMD, HYGON, ..., ANY
@@ -208,6 +207,7 @@
 		VFM_MODEL(vfm),				\
 		X86_STEPPING_ANY, X86_FEATURE_ANY, data)
 
+#define __X86_STEPPINGS(mins, maxs)    GENMASK(maxs, mins)
 /**
  * X86_MATCH_VFM_STEPPINGS - Match encoded vendor/family/model/stepping
  * @vfm:	Encoded 8-bits each for vendor, family, model
@@ -218,12 +218,13 @@
  *
  * feature is set to wildcard
  */
-#define X86_MATCH_VFM_STEPPINGS(vfm, steppings, data)	\
-	X86_MATCH_VENDORID_FAM_MODEL_STEPPINGS_FEATURE(	\
-		VFM_VENDOR(vfm),			\
-		VFM_FAMILY(vfm),			\
-		VFM_MODEL(vfm),				\
-		steppings, X86_FEATURE_ANY, data)
+#define X86_MATCH_VFM_STEPS(vfm, min_step, max_step, data)	\
+	X86_MATCH_VENDORID_FAM_MODEL_STEPPINGS_FEATURE(		\
+		VFM_VENDOR(vfm),				\
+		VFM_FAMILY(vfm),				\
+		VFM_MODEL(vfm),					\
+		__X86_STEPPINGS(min_step, max_step),		\
+		X86_FEATURE_ANY, data)
 
 /**
  * X86_MATCH_VFM_FEATURE - Match encoded vendor/family/model/feature
diff -puN arch/x86/kernel/apic/apic.c~zap-X86_STEPPINGS arch/x86/kernel/apic/apic.c
--- a/arch/x86/kernel/apic/apic.c~zap-X86_STEPPINGS	2024-12-13 10:47:38.285373210 -0800
+++ b/arch/x86/kernel/apic/apic.c	2024-12-13 10:47:38.293373533 -0800
@@ -509,19 +509,19 @@ static struct clock_event_device lapic_c
 static DEFINE_PER_CPU(struct clock_event_device, lapic_events);
 
 static const struct x86_cpu_id deadline_match[] __initconst = {
-	X86_MATCH_VFM_STEPPINGS(INTEL_HASWELL_X, X86_STEPPINGS(0x2, 0x2), 0x3a), /* EP */
-	X86_MATCH_VFM_STEPPINGS(INTEL_HASWELL_X, X86_STEPPINGS(0x4, 0x4), 0x0f), /* EX */
+	X86_MATCH_VFM_STEPS(INTEL_HASWELL_X,   0x2, 0x2, 0x3a), /* EP */
+	X86_MATCH_VFM_STEPS(INTEL_HASWELL_X,   0x4, 0x4, 0x0f), /* EX */
 
 	X86_MATCH_VFM(INTEL_BROADWELL_X,	0x0b000020),
 
-	X86_MATCH_VFM_STEPPINGS(INTEL_BROADWELL_D, X86_STEPPINGS(0x2, 0x2), 0x00000011),
-	X86_MATCH_VFM_STEPPINGS(INTEL_BROADWELL_D, X86_STEPPINGS(0x3, 0x3), 0x0700000e),
-	X86_MATCH_VFM_STEPPINGS(INTEL_BROADWELL_D, X86_STEPPINGS(0x4, 0x4), 0x0f00000c),
-	X86_MATCH_VFM_STEPPINGS(INTEL_BROADWELL_D, X86_STEPPINGS(0x5, 0x5), 0x0e000003),
+	X86_MATCH_VFM_STEPS(INTEL_BROADWELL_D, 0x2, 0x2, 0x00000011),
+	X86_MATCH_VFM_STEPS(INTEL_BROADWELL_D, 0x3, 0x3, 0x0700000e),
+	X86_MATCH_VFM_STEPS(INTEL_BROADWELL_D, 0x4, 0x4, 0x0f00000c),
+	X86_MATCH_VFM_STEPS(INTEL_BROADWELL_D, 0x5, 0x5, 0x0e000003),
 
-	X86_MATCH_VFM_STEPPINGS(INTEL_SKYLAKE_X, X86_STEPPINGS(0x3, 0x3), 0x01000136),
-	X86_MATCH_VFM_STEPPINGS(INTEL_SKYLAKE_X, X86_STEPPINGS(0x4, 0x4), 0x02000014),
-	X86_MATCH_VFM_STEPPINGS(INTEL_SKYLAKE_X, X86_STEPPINGS(0x5, 0xf), 0),
+	X86_MATCH_VFM_STEPS(INTEL_SKYLAKE_X,   0x3, 0x3, 0x01000136),
+	X86_MATCH_VFM_STEPS(INTEL_SKYLAKE_X,   0x4, 0x4, 0x02000014),
+	X86_MATCH_VFM_STEPS(INTEL_SKYLAKE_X,   0x5, 0xf, 0),
 
 	X86_MATCH_VFM(INTEL_HASWELL,		0x22),
 	X86_MATCH_VFM(INTEL_HASWELL_L,		0x20),
diff -puN arch/x86/kernel/cpu/common.c~zap-X86_STEPPINGS arch/x86/kernel/cpu/common.c
--- a/arch/x86/kernel/cpu/common.c~zap-X86_STEPPINGS	2024-12-13 10:47:38.285373210 -0800
+++ b/arch/x86/kernel/cpu/common.c	2024-12-13 10:47:38.293373533 -0800
@@ -1201,8 +1201,8 @@ static const __initconst struct x86_cpu_
 #define VULNBL(vendor, family, model, blacklist)	\
 	X86_MATCH_VENDOR_FAM_MODEL(vendor, family, model, blacklist)
 
-#define VULNBL_INTEL_STEPPINGS(vfm, steppings, issues)		   \
-	X86_MATCH_VFM_STEPPINGS(vfm, steppings, issues)
+#define VULNBL_INTEL_STEPS(vfm, max_stepping, issues)		   \
+	X86_MATCH_VFM_STEPS(vfm, X86_STEP_MIN, max_stepping, issues)
 
 #define VULNBL_AMD(family, blacklist)		\
 	VULNBL(AMD, family, X86_MODEL_ANY, blacklist)
@@ -1227,43 +1227,43 @@ static const __initconst struct x86_cpu_
 #define RFDS		BIT(7)
 
 static const struct x86_cpu_id cpu_vuln_blacklist[] __initconst = {
-	VULNBL_INTEL_STEPPINGS(INTEL_IVYBRIDGE,		X86_STEPPING_ANY,		SRBDS),
-	VULNBL_INTEL_STEPPINGS(INTEL_HASWELL,		X86_STEPPING_ANY,		SRBDS),
-	VULNBL_INTEL_STEPPINGS(INTEL_HASWELL_L,		X86_STEPPING_ANY,		SRBDS),
-	VULNBL_INTEL_STEPPINGS(INTEL_HASWELL_G,		X86_STEPPING_ANY,		SRBDS),
-	VULNBL_INTEL_STEPPINGS(INTEL_HASWELL_X,		X86_STEPPING_ANY,		MMIO),
-	VULNBL_INTEL_STEPPINGS(INTEL_BROADWELL_D,	X86_STEPPING_ANY,		MMIO),
-	VULNBL_INTEL_STEPPINGS(INTEL_BROADWELL_G,	X86_STEPPING_ANY,		SRBDS),
-	VULNBL_INTEL_STEPPINGS(INTEL_BROADWELL_X,	X86_STEPPING_ANY,		MMIO),
-	VULNBL_INTEL_STEPPINGS(INTEL_BROADWELL,		X86_STEPPING_ANY,		SRBDS),
-	VULNBL_INTEL_STEPPINGS(INTEL_SKYLAKE_X,		X86_STEPPING_ANY,		MMIO | RETBLEED | GDS),
-	VULNBL_INTEL_STEPPINGS(INTEL_SKYLAKE_L,		X86_STEPPING_ANY,		MMIO | RETBLEED | GDS | SRBDS),
-	VULNBL_INTEL_STEPPINGS(INTEL_SKYLAKE,		X86_STEPPING_ANY,		MMIO | RETBLEED | GDS | SRBDS),
-	VULNBL_INTEL_STEPPINGS(INTEL_KABYLAKE_L,	X86_STEPPING_ANY,		MMIO | RETBLEED | GDS | SRBDS),
-	VULNBL_INTEL_STEPPINGS(INTEL_KABYLAKE,		X86_STEPPING_ANY,		MMIO | RETBLEED | GDS | SRBDS),
-	VULNBL_INTEL_STEPPINGS(INTEL_CANNONLAKE_L,	X86_STEPPING_ANY,		RETBLEED),
-	VULNBL_INTEL_STEPPINGS(INTEL_ICELAKE_L,		X86_STEPPING_ANY,		MMIO | MMIO_SBDS | RETBLEED | GDS),
-	VULNBL_INTEL_STEPPINGS(INTEL_ICELAKE_D,		X86_STEPPING_ANY,		MMIO | GDS),
-	VULNBL_INTEL_STEPPINGS(INTEL_ICELAKE_X,		X86_STEPPING_ANY,		MMIO | GDS),
-	VULNBL_INTEL_STEPPINGS(INTEL_COMETLAKE,		X86_STEPPING_ANY,		MMIO | MMIO_SBDS | RETBLEED | GDS),
-	VULNBL_INTEL_STEPPINGS(INTEL_COMETLAKE_L,	X86_STEPPINGS(0x0, 0x0),	MMIO | RETBLEED),
-	VULNBL_INTEL_STEPPINGS(INTEL_COMETLAKE_L,	X86_STEPPING_ANY,		MMIO | MMIO_SBDS | RETBLEED | GDS),
-	VULNBL_INTEL_STEPPINGS(INTEL_TIGERLAKE_L,	X86_STEPPING_ANY,		GDS),
-	VULNBL_INTEL_STEPPINGS(INTEL_TIGERLAKE,		X86_STEPPING_ANY,		GDS),
-	VULNBL_INTEL_STEPPINGS(INTEL_LAKEFIELD,		X86_STEPPING_ANY,		MMIO | MMIO_SBDS | RETBLEED),
-	VULNBL_INTEL_STEPPINGS(INTEL_ROCKETLAKE,	X86_STEPPING_ANY,		MMIO | RETBLEED | GDS),
-	VULNBL_INTEL_STEPPINGS(INTEL_ALDERLAKE,		X86_STEPPING_ANY,		RFDS),
-	VULNBL_INTEL_STEPPINGS(INTEL_ALDERLAKE_L,	X86_STEPPING_ANY,		RFDS),
-	VULNBL_INTEL_STEPPINGS(INTEL_RAPTORLAKE,	X86_STEPPING_ANY,		RFDS),
-	VULNBL_INTEL_STEPPINGS(INTEL_RAPTORLAKE_P,	X86_STEPPING_ANY,		RFDS),
-	VULNBL_INTEL_STEPPINGS(INTEL_RAPTORLAKE_S,	X86_STEPPING_ANY,		RFDS),
-	VULNBL_INTEL_STEPPINGS(INTEL_ATOM_GRACEMONT,	X86_STEPPING_ANY,		RFDS),
-	VULNBL_INTEL_STEPPINGS(INTEL_ATOM_TREMONT,	X86_STEPPING_ANY,		MMIO | MMIO_SBDS | RFDS),
-	VULNBL_INTEL_STEPPINGS(INTEL_ATOM_TREMONT_D,	X86_STEPPING_ANY,		MMIO | RFDS),
-	VULNBL_INTEL_STEPPINGS(INTEL_ATOM_TREMONT_L,	X86_STEPPING_ANY,		MMIO | MMIO_SBDS | RFDS),
-	VULNBL_INTEL_STEPPINGS(INTEL_ATOM_GOLDMONT,	X86_STEPPING_ANY,		RFDS),
-	VULNBL_INTEL_STEPPINGS(INTEL_ATOM_GOLDMONT_D,	X86_STEPPING_ANY,		RFDS),
-	VULNBL_INTEL_STEPPINGS(INTEL_ATOM_GOLDMONT_PLUS, X86_STEPPING_ANY,		RFDS),
+	VULNBL_INTEL_STEPS(INTEL_IVYBRIDGE,	     X86_STEP_MAX,	SRBDS),
+	VULNBL_INTEL_STEPS(INTEL_HASWELL,	     X86_STEP_MAX,	SRBDS),
+	VULNBL_INTEL_STEPS(INTEL_HASWELL_L,	     X86_STEP_MAX,	SRBDS),
+	VULNBL_INTEL_STEPS(INTEL_HASWELL_G,	     X86_STEP_MAX,	SRBDS),
+	VULNBL_INTEL_STEPS(INTEL_HASWELL_X,	     X86_STEP_MAX,	MMIO),
+	VULNBL_INTEL_STEPS(INTEL_BROADWELL_D,	     X86_STEP_MAX,	MMIO),
+	VULNBL_INTEL_STEPS(INTEL_BROADWELL_G,	     X86_STEP_MAX,	SRBDS),
+	VULNBL_INTEL_STEPS(INTEL_BROADWELL_X,	     X86_STEP_MAX,	MMIO),
+	VULNBL_INTEL_STEPS(INTEL_BROADWELL,	     X86_STEP_MAX,	SRBDS),
+	VULNBL_INTEL_STEPS(INTEL_SKYLAKE_X,	     X86_STEP_MAX,	MMIO | RETBLEED | GDS),
+	VULNBL_INTEL_STEPS(INTEL_SKYLAKE_L,	     X86_STEP_MAX,	MMIO | RETBLEED | GDS | SRBDS),
+	VULNBL_INTEL_STEPS(INTEL_SKYLAKE,	     X86_STEP_MAX,	MMIO | RETBLEED | GDS | SRBDS),
+	VULNBL_INTEL_STEPS(INTEL_KABYLAKE_L,	     X86_STEP_MAX,	MMIO | RETBLEED | GDS | SRBDS),
+	VULNBL_INTEL_STEPS(INTEL_KABYLAKE,	     X86_STEP_MAX,	MMIO | RETBLEED | GDS | SRBDS),
+	VULNBL_INTEL_STEPS(INTEL_CANNONLAKE_L,	     X86_STEP_MAX,	RETBLEED),
+	VULNBL_INTEL_STEPS(INTEL_ICELAKE_L,	     X86_STEP_MAX,	MMIO | MMIO_SBDS | RETBLEED | GDS),
+	VULNBL_INTEL_STEPS(INTEL_ICELAKE_D,	     X86_STEP_MAX,	MMIO | GDS),
+	VULNBL_INTEL_STEPS(INTEL_ICELAKE_X,	     X86_STEP_MAX,	MMIO | GDS),
+	VULNBL_INTEL_STEPS(INTEL_COMETLAKE,	     X86_STEP_MAX,	MMIO | MMIO_SBDS | RETBLEED | GDS),
+	VULNBL_INTEL_STEPS(INTEL_COMETLAKE_L,		      0x0,	MMIO | RETBLEED),
+	VULNBL_INTEL_STEPS(INTEL_COMETLAKE_L,	     X86_STEP_MAX,	MMIO | MMIO_SBDS | RETBLEED | GDS),
+	VULNBL_INTEL_STEPS(INTEL_TIGERLAKE_L,	     X86_STEP_MAX,	GDS),
+	VULNBL_INTEL_STEPS(INTEL_TIGERLAKE,	     X86_STEP_MAX,	GDS),
+	VULNBL_INTEL_STEPS(INTEL_LAKEFIELD,	     X86_STEP_MAX,	MMIO | MMIO_SBDS | RETBLEED),
+	VULNBL_INTEL_STEPS(INTEL_ROCKETLAKE,	     X86_STEP_MAX,	MMIO | RETBLEED | GDS),
+	VULNBL_INTEL_STEPS(INTEL_ALDERLAKE,	     X86_STEP_MAX,	RFDS),
+	VULNBL_INTEL_STEPS(INTEL_ALDERLAKE_L,	     X86_STEP_MAX,	RFDS),
+	VULNBL_INTEL_STEPS(INTEL_RAPTORLAKE,	     X86_STEP_MAX,	RFDS),
+	VULNBL_INTEL_STEPS(INTEL_RAPTORLAKE_P,	     X86_STEP_MAX,	RFDS),
+	VULNBL_INTEL_STEPS(INTEL_RAPTORLAKE_S,	     X86_STEP_MAX,	RFDS),
+	VULNBL_INTEL_STEPS(INTEL_ATOM_GRACEMONT,     X86_STEP_MAX,	RFDS),
+	VULNBL_INTEL_STEPS(INTEL_ATOM_TREMONT,	     X86_STEP_MAX,	MMIO | MMIO_SBDS | RFDS),
+	VULNBL_INTEL_STEPS(INTEL_ATOM_TREMONT_D,     X86_STEP_MAX,	MMIO | RFDS),
+	VULNBL_INTEL_STEPS(INTEL_ATOM_TREMONT_L,     X86_STEP_MAX,	MMIO | MMIO_SBDS | RFDS),
+	VULNBL_INTEL_STEPS(INTEL_ATOM_GOLDMONT,      X86_STEP_MAX,	RFDS),
+	VULNBL_INTEL_STEPS(INTEL_ATOM_GOLDMONT_D,    X86_STEP_MAX,	RFDS),
+	VULNBL_INTEL_STEPS(INTEL_ATOM_GOLDMONT_PLUS, X86_STEP_MAX,	RFDS),
 
 	VULNBL_AMD(0x15, RETBLEED),
 	VULNBL_AMD(0x16, RETBLEED),
diff -puN drivers/edac/i10nm_base.c~zap-X86_STEPPINGS drivers/edac/i10nm_base.c
--- a/drivers/edac/i10nm_base.c~zap-X86_STEPPINGS	2024-12-13 10:47:38.285373210 -0800
+++ b/drivers/edac/i10nm_base.c	2024-12-13 10:47:38.293373533 -0800
@@ -938,16 +938,17 @@ static struct res_config gnr_cfg = {
 };
 
 static const struct x86_cpu_id i10nm_cpuids[] = {
-	X86_MATCH_VFM_STEPPINGS(INTEL_ATOM_TREMONT_D,	X86_STEPPINGS(0x0, 0x3), &i10nm_cfg0),
-	X86_MATCH_VFM_STEPPINGS(INTEL_ATOM_TREMONT_D,	X86_STEPPINGS(0x4, 0xf), &i10nm_cfg1),
-	X86_MATCH_VFM_STEPPINGS(INTEL_ICELAKE_X,	X86_STEPPINGS(0x0, 0x3), &i10nm_cfg0),
-	X86_MATCH_VFM_STEPPINGS(INTEL_ICELAKE_X,	X86_STEPPINGS(0x4, 0xf), &i10nm_cfg1),
-	X86_MATCH_VFM_STEPPINGS(INTEL_ICELAKE_D,	X86_STEPPINGS(0x0, 0xf), &i10nm_cfg1),
-	X86_MATCH_VFM_STEPPINGS(INTEL_SAPPHIRERAPIDS_X,	X86_STEPPINGS(0x0, 0xf), &spr_cfg),
-	X86_MATCH_VFM_STEPPINGS(INTEL_EMERALDRAPIDS_X,	X86_STEPPINGS(0x0, 0xf), &spr_cfg),
-	X86_MATCH_VFM_STEPPINGS(INTEL_GRANITERAPIDS_X,	X86_STEPPINGS(0x0, 0xf), &gnr_cfg),
-	X86_MATCH_VFM_STEPPINGS(INTEL_ATOM_CRESTMONT_X,	X86_STEPPINGS(0x0, 0xf), &gnr_cfg),
-	X86_MATCH_VFM_STEPPINGS(INTEL_ATOM_CRESTMONT,	X86_STEPPINGS(0x0, 0xf), &gnr_cfg),
+	X86_MATCH_VFM_STEPS(INTEL_ATOM_TREMONT_D, X86_STEP_MIN,		 0x3, &i10nm_cfg0),
+	X86_MATCH_VFM_STEPS(INTEL_ATOM_TREMONT_D, 	   0x4,	X86_STEP_MAX, &i10nm_cfg1),
+	X86_MATCH_VFM_STEPS(INTEL_ICELAKE_X,	  X86_STEP_MIN, 	 0x3, &i10nm_cfg0),
+	X86_MATCH_VFM_STEPS(INTEL_ICELAKE_X,	 	   0x4, X86_STEP_MAX, &i10nm_cfg1),
+	X86_MATCH_VFM(	    INTEL_ICELAKE_D, 				      &i10nm_cfg1),
+
+	X86_MATCH_VFM(INTEL_SAPPHIRERAPIDS_X, &spr_cfg),
+	X86_MATCH_VFM(INTEL_EMERALDRAPIDS_X,  &spr_cfg),
+	X86_MATCH_VFM(INTEL_GRANITERAPIDS_X,  &gnr_cfg),
+	X86_MATCH_VFM(INTEL_ATOM_CRESTMONT_X, &gnr_cfg),
+	X86_MATCH_VFM(INTEL_ATOM_CRESTMONT,   &gnr_cfg),
 	{}
 };
 MODULE_DEVICE_TABLE(x86cpu, i10nm_cpuids);
diff -puN drivers/edac/skx_base.c~zap-X86_STEPPINGS drivers/edac/skx_base.c
--- a/drivers/edac/skx_base.c~zap-X86_STEPPINGS	2024-12-13 10:47:38.289373371 -0800
+++ b/drivers/edac/skx_base.c	2024-12-13 10:47:38.293373533 -0800
@@ -164,7 +164,7 @@ static struct res_config skx_cfg = {
 };
 
 static const struct x86_cpu_id skx_cpuids[] = {
-	X86_MATCH_VFM_STEPPINGS(INTEL_SKYLAKE_X, X86_STEPPINGS(0x0, 0xf), &skx_cfg),
+	X86_MATCH_VFM(INTEL_SKYLAKE_X, &skx_cfg),
 	{ }
 };
 MODULE_DEVICE_TABLE(x86cpu, skx_cpuids);
diff -puN include/linux/mod_devicetable.h~zap-X86_STEPPINGS include/linux/mod_devicetable.h
--- a/include/linux/mod_devicetable.h~zap-X86_STEPPINGS	2024-12-13 10:47:38.289373371 -0800
+++ b/include/linux/mod_devicetable.h	2024-12-13 10:47:38.293373533 -0800
@@ -700,6 +700,8 @@ struct x86_cpu_id {
 #define X86_FAMILY_ANY 0
 #define X86_MODEL_ANY  0
 #define X86_STEPPING_ANY 0
+#define X86_STEP_MIN 0
+#define X86_STEP_MAX 0xf
 #define X86_FEATURE_ANY 0	/* Same as FPU, you can't test for that */
 
 /*
_

[v2][PATCH 3/5] x86/cpu: Replace PEBS use of 'x86_cpu_desc' use with 'x86_cpu_id'

[Dave Hansen]

From: Dave Hansen <dave.hansen@linux.intel.com>

The 'x86_cpu_desc' and 'x86_cpu_id' structures are very similar.
Reduce duplicate infrastructure by moving the few users of
'x86_cpu_desc' to the much more common variant.

The existing X86_MATCH_VFM_STEPS() helper matches ranges of
steppings. Instead of introducing a single-stepping match function
which could get confusing when paired with the range, just use
the stepping min/max match helper and use min==max.

Note that this makes the table more vertically compact because
multiple entries like this:

       INTEL_CPU_DESC(INTEL_SKYLAKE_X,          4, 0x00000000),
       INTEL_CPU_DESC(INTEL_SKYLAKE_X,          5, 0x00000000),
       INTEL_CPU_DESC(INTEL_SKYLAKE_X,          6, 0x00000000),
       INTEL_CPU_DESC(INTEL_SKYLAKE_X,          7, 0x00000000),

can be consolidated down to a single stepping range.

Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com>
---

 b/arch/x86/events/intel/core.c |   62 +++++++++++++++++------------------------
 1 file changed, 26 insertions(+), 36 deletions(-)

diff -puN arch/x86/events/intel/core.c~zap-x86_cpu_desc arch/x86/events/intel/core.c
--- a/arch/x86/events/intel/core.c~zap-x86_cpu_desc	2024-12-13 10:47:46.965723323 -0800
+++ b/arch/x86/events/intel/core.c	2024-12-13 10:47:46.969723484 -0800
@@ -5371,42 +5371,32 @@ static __init void intel_clovertown_quir
 	x86_pmu.pebs_constraints = NULL;
 }
 
-static const struct x86_cpu_desc isolation_ucodes[] = {
-	INTEL_CPU_DESC(INTEL_HASWELL,		 3, 0x0000001f),
-	INTEL_CPU_DESC(INTEL_HASWELL_L,		 1, 0x0000001e),
-	INTEL_CPU_DESC(INTEL_HASWELL_G,		 1, 0x00000015),
-	INTEL_CPU_DESC(INTEL_HASWELL_X,		 2, 0x00000037),
-	INTEL_CPU_DESC(INTEL_HASWELL_X,		 4, 0x0000000a),
-	INTEL_CPU_DESC(INTEL_BROADWELL,		 4, 0x00000023),
-	INTEL_CPU_DESC(INTEL_BROADWELL_G,	 1, 0x00000014),
-	INTEL_CPU_DESC(INTEL_BROADWELL_D,	 2, 0x00000010),
-	INTEL_CPU_DESC(INTEL_BROADWELL_D,	 3, 0x07000009),
-	INTEL_CPU_DESC(INTEL_BROADWELL_D,	 4, 0x0f000009),
-	INTEL_CPU_DESC(INTEL_BROADWELL_D,	 5, 0x0e000002),
-	INTEL_CPU_DESC(INTEL_BROADWELL_X,	 1, 0x0b000014),
-	INTEL_CPU_DESC(INTEL_SKYLAKE_X,		 3, 0x00000021),
-	INTEL_CPU_DESC(INTEL_SKYLAKE_X,		 4, 0x00000000),
-	INTEL_CPU_DESC(INTEL_SKYLAKE_X,		 5, 0x00000000),
-	INTEL_CPU_DESC(INTEL_SKYLAKE_X,		 6, 0x00000000),
-	INTEL_CPU_DESC(INTEL_SKYLAKE_X,		 7, 0x00000000),
-	INTEL_CPU_DESC(INTEL_SKYLAKE_X,		11, 0x00000000),
-	INTEL_CPU_DESC(INTEL_SKYLAKE_L,		 3, 0x0000007c),
-	INTEL_CPU_DESC(INTEL_SKYLAKE,		 3, 0x0000007c),
-	INTEL_CPU_DESC(INTEL_KABYLAKE,		 9, 0x0000004e),
-	INTEL_CPU_DESC(INTEL_KABYLAKE_L,	 9, 0x0000004e),
-	INTEL_CPU_DESC(INTEL_KABYLAKE_L,	10, 0x0000004e),
-	INTEL_CPU_DESC(INTEL_KABYLAKE_L,	11, 0x0000004e),
-	INTEL_CPU_DESC(INTEL_KABYLAKE_L,	12, 0x0000004e),
-	INTEL_CPU_DESC(INTEL_KABYLAKE,		10, 0x0000004e),
-	INTEL_CPU_DESC(INTEL_KABYLAKE,		11, 0x0000004e),
-	INTEL_CPU_DESC(INTEL_KABYLAKE,		12, 0x0000004e),
-	INTEL_CPU_DESC(INTEL_KABYLAKE,		13, 0x0000004e),
+static const struct x86_cpu_id isolation_ucodes[] = {
+	X86_MATCH_VFM_STEPS(INTEL_HASWELL,	 3,  3, 0x0000001f),
+	X86_MATCH_VFM_STEPS(INTEL_HASWELL_L,	 1,  1, 0x0000001e),
+	X86_MATCH_VFM_STEPS(INTEL_HASWELL_G,	 1,  1, 0x00000015),
+	X86_MATCH_VFM_STEPS(INTEL_HASWELL_X,	 2,  2, 0x00000037),
+	X86_MATCH_VFM_STEPS(INTEL_HASWELL_X,	 4,  4, 0x0000000a),
+	X86_MATCH_VFM_STEPS(INTEL_BROADWELL,	 4,  4, 0x00000023),
+	X86_MATCH_VFM_STEPS(INTEL_BROADWELL_G,	 1,  1, 0x00000014),
+	X86_MATCH_VFM_STEPS(INTEL_BROADWELL_D,	 2,  2, 0x00000010),
+	X86_MATCH_VFM_STEPS(INTEL_BROADWELL_D,	 3,  3, 0x07000009),
+	X86_MATCH_VFM_STEPS(INTEL_BROADWELL_D,	 4,  4, 0x0f000009),
+	X86_MATCH_VFM_STEPS(INTEL_BROADWELL_D,	 5,  5, 0x0e000002),
+	X86_MATCH_VFM_STEPS(INTEL_BROADWELL_X,	 1,  1, 0x0b000014),
+	X86_MATCH_VFM_STEPS(INTEL_SKYLAKE_X,	 3,  3, 0x00000021),
+	X86_MATCH_VFM_STEPS(INTEL_SKYLAKE_X,	 4,  7, 0x00000000),
+	X86_MATCH_VFM_STEPS(INTEL_SKYLAKE_X,	11, 11, 0x00000000),
+	X86_MATCH_VFM_STEPS(INTEL_SKYLAKE_L,	 3,  3, 0x0000007c),
+	X86_MATCH_VFM_STEPS(INTEL_SKYLAKE,	 3,  3, 0x0000007c),
+	X86_MATCH_VFM_STEPS(INTEL_KABYLAKE,	 9, 13, 0x0000004e),
+	X86_MATCH_VFM_STEPS(INTEL_KABYLAKE_L,	 9, 12, 0x0000004e),
 	{}
 };
 
 static void intel_check_pebs_isolation(void)
 {
-	x86_pmu.pebs_no_isolation = !x86_cpu_has_min_microcode_rev(isolation_ucodes);
+	x86_pmu.pebs_no_isolation = !x86_match_min_microcode_rev(isolation_ucodes);
 }
 
 static __init void intel_pebs_isolation_quirk(void)
@@ -5416,16 +5406,16 @@ static __init void intel_pebs_isolation_
 	intel_check_pebs_isolation();
 }
 
-static const struct x86_cpu_desc pebs_ucodes[] = {
-	INTEL_CPU_DESC(INTEL_SANDYBRIDGE,	7, 0x00000028),
-	INTEL_CPU_DESC(INTEL_SANDYBRIDGE_X,	6, 0x00000618),
-	INTEL_CPU_DESC(INTEL_SANDYBRIDGE_X,	7, 0x0000070c),
+static const struct x86_cpu_id pebs_ucodes[] = {
+	X86_MATCH_VFM_STEPS(INTEL_SANDYBRIDGE,	7, 7, 0x00000028),
+	X86_MATCH_VFM_STEPS(INTEL_SANDYBRIDGE_X,	6, 6, 0x00000618),
+	X86_MATCH_VFM_STEPS(INTEL_SANDYBRIDGE_X,	7, 7, 0x0000070c),
 	{}
 };
 
 static bool intel_snb_pebs_broken(void)
 {
-	return !x86_cpu_has_min_microcode_rev(pebs_ucodes);
+	return !x86_match_min_microcode_rev(pebs_ucodes);
 }
 
 static void intel_snb_check_microcode(void)
_

[v2][PATCH 4/5] x86/cpu: Move AMD erratum 1386 table over to 'x86_cpu_id'

[Dave Hansen]

From: Dave Hansen <dave.hansen@linux.intel.com>

The AMD erratum 1386 detection code uses and old style 'x86_cpu_desc'
table. Replace it with 'x86_cpu_id' so the old style can be removed.

I did not create a new helper macro here. The new table is certainly
more noisy than the old and it can be improved on. But I was hesitant
to create a new macro just for a single site that is only two ugly
lines in the end.

Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com>
---

 b/arch/x86/kernel/cpu/amd.c |    9 ++++-----
 1 file changed, 4 insertions(+), 5 deletions(-)

diff -puN arch/x86/kernel/cpu/amd.c~amd-x86_cpu_id arch/x86/kernel/cpu/amd.c
--- a/arch/x86/kernel/cpu/amd.c~amd-x86_cpu_id	2024-12-13 10:47:55.714076132 -0800
+++ b/arch/x86/kernel/cpu/amd.c	2024-12-13 10:47:55.718076292 -0800
@@ -795,10 +795,9 @@ static void init_amd_bd(struct cpuinfo_x
 	clear_rdrand_cpuid_bit(c);
 }
 
-static const struct x86_cpu_desc erratum_1386_microcode[] = {
-	AMD_CPU_DESC(0x17,  0x1, 0x2, 0x0800126e),
-	AMD_CPU_DESC(0x17, 0x31, 0x0, 0x08301052),
-	{},
+static const struct x86_cpu_id erratum_1386_microcode[] = {
+	X86_MATCH_VFM_STEPS(VFM_MAKE(X86_VENDOR_AMD, 0x17, 0x01), 0x2, 0x2, 0x0800126e),
+	X86_MATCH_VFM_STEPS(VFM_MAKE(X86_VENDOR_AMD, 0x17, 0x31), 0x0, 0x0, 0x08301052),
 };
 
 static void fix_erratum_1386(struct cpuinfo_x86 *c)
@@ -814,7 +813,7 @@ static void fix_erratum_1386(struct cpui
 	 * Clear the feature flag only on microcode revisions which
 	 * don't have the fix.
 	 */
-	if (x86_cpu_has_min_microcode_rev(erratum_1386_microcode))
+	if (x86_match_min_microcode_rev(erratum_1386_microcode))
 		return;
 
 	clear_cpu_cap(c, X86_FEATURE_XSAVES);
_

Re: [v2][PATCH 4/5] x86/cpu: Move AMD erratum 1386 table over to 'x86_cpu_id'

[Jiri Slaby]

I noted this on IRC...

On 13. 12. 24, 19:51, Dave Hansen wrote:
> From: Dave Hansen <dave.hansen@linux.intel.com>
> 
> The AMD erratum 1386 detection code uses and old style 'x86_cpu_desc'
> table. Replace it with 'x86_cpu_id' so the old style can be removed.
> 
> I did not create a new helper macro here. The new table is certainly
> more noisy than the old and it can be improved on. But I was hesitant
> to create a new macro just for a single site that is only two ugly
> lines in the end.
> 
> Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com>
> ---
> 
>   b/arch/x86/kernel/cpu/amd.c |    9 ++++-----
>   1 file changed, 4 insertions(+), 5 deletions(-)
> 
> diff -puN arch/x86/kernel/cpu/amd.c~amd-x86_cpu_id arch/x86/kernel/cpu/amd.c
> --- a/arch/x86/kernel/cpu/amd.c~amd-x86_cpu_id	2024-12-13 10:47:55.714076132 -0800
> +++ b/arch/x86/kernel/cpu/amd.c	2024-12-13 10:47:55.718076292 -0800
> @@ -795,10 +795,9 @@ static void init_amd_bd(struct cpuinfo_x
>   	clear_rdrand_cpuid_bit(c);
>   }
>   
> -static const struct x86_cpu_desc erratum_1386_microcode[] = {
> -	AMD_CPU_DESC(0x17,  0x1, 0x2, 0x0800126e),
> -	AMD_CPU_DESC(0x17, 0x31, 0x0, 0x08301052),
> -	{},

If I am to tell, the {} is needed, otherwise you touch the array OOB (at 
least with the "m->flags & X86_CPU_ID_FLAG_ENTRY_VALID" test -- if the 
bit is set in the memory, then much more than that...).

> +static const struct x86_cpu_id erratum_1386_microcode[] = {
> +	X86_MATCH_VFM_STEPS(VFM_MAKE(X86_VENDOR_AMD, 0x17, 0x01), 0x2, 0x2, 0x0800126e),
> +	X86_MATCH_VFM_STEPS(VFM_MAKE(X86_VENDOR_AMD, 0x17, 0x31), 0x0, 0x0, 0x08301052),
>   };
>   
>   static void fix_erratum_1386(struct cpuinfo_x86 *c)
> @@ -814,7 +813,7 @@ static void fix_erratum_1386(struct cpui
>   	 * Clear the feature flag only on microcode revisions which
>   	 * don't have the fix.
>   	 */
> -	if (x86_cpu_has_min_microcode_rev(erratum_1386_microcode))
> +	if (x86_match_min_microcode_rev(erratum_1386_microcode))
>   		return;
>   
>   	clear_cpu_cap(c, X86_FEATURE_XSAVES);

thanks,
-- 
js
suse labs

Re: [v2][PATCH 4/5] x86/cpu: Move AMD erratum 1386 table over to 'x86_cpu_id'

[Borislav Petkov]

On Wed, Apr 09, 2025 at 01:13:53PM +0200, Jiri Slaby wrote:
> If I am to tell, the {} is needed, otherwise you touch the array OOB (at
> least with the "m->flags & X86_CPU_ID_FLAG_ENTRY_VALID" test -- if the bit
> is set in the memory, then much more than that...).

Send a patch pls.

-- 
Regards/Gruss,
    Boris.

https://people.kernel.org/tglx/notes-about-netiquette

Re: [v2][PATCH 4/5] x86/cpu: Move AMD erratum 1386 table over to 'x86_cpu_id'

[Dave Hansen]

On 4/9/25 08:18, Borislav Petkov wrote:
> On Wed, Apr 09, 2025 at 01:13:53PM +0200, Jiri Slaby wrote:
>> If I am to tell, the {} is needed, otherwise you touch the array OOB (at
>> least with the "m->flags & X86_CPU_ID_FLAG_ENTRY_VALID" test -- if the bit
>> is set in the memory, then much more than that...).
> Send a patch pls.

I'm compiling this as we speak:

> https://git.kernel.org/pub/scm/linux/kernel/git/daveh/devel.git/commit/?h=testme&id=d41cad0e49200c1d812daa8a40600405888b666f

I'll throw it in x86/urgent in a bit.

Re: [v2][PATCH 4/5] x86/cpu: Move AMD erratum 1386 table over to 'x86_cpu_id'

[Jiri Slaby]

On 09. 04. 25, 17:21, Dave Hansen wrote:
> On 4/9/25 08:18, Borislav Petkov wrote:
>> On Wed, Apr 09, 2025 at 01:13:53PM +0200, Jiri Slaby wrote:
>>> If I am to tell, the {} is needed, otherwise you touch the array OOB (at
>>> least with the "m->flags & X86_CPU_ID_FLAG_ENTRY_VALID" test -- if the bit
>>> is set in the memory, then much more than that...).
>> Send a patch pls.
> 
> I'm compiling this as we speak:
> 
>> https://git.kernel.org/pub/scm/linux/kernel/git/daveh/devel.git/commit/?h=testme&id=d41cad0e49200c1d812daa8a40600405888b666f
> 
> I'll throw it in x86/urgent in a bit.

LGTM. It should have had a link to this thread and feel free to add:

Reviewed-by: Jiri Slaby <jirislaby@kernel.org>

thanks,
-- 
js
suse labs

[v2][PATCH 5/5] x86/cpu: Remove 'x86_cpu_desc' infrastructure

[Dave Hansen]

From: Dave Hansen <dave.hansen@linux.intel.com>

All the users of 'x86_cpu_desc' are gone.  Zap it from the tree.

Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com>
---

 b/arch/x86/include/asm/cpu_device_id.h |   35 ---------------------------------
 b/arch/x86/kernel/cpu/match.c          |   31 -----------------------------
 2 files changed, 66 deletions(-)

diff -puN arch/x86/include/asm/cpu_device_id.h~zap-x86_cpu_desc-3 arch/x86/include/asm/cpu_device_id.h
--- a/arch/x86/include/asm/cpu_device_id.h~zap-x86_cpu_desc-3	2024-12-13 10:48:03.174376959 -0800
+++ b/arch/x86/include/asm/cpu_device_id.h	2024-12-13 10:48:03.178377120 -0800
@@ -243,42 +243,7 @@
 		VFM_MODEL(vfm),				\
 		X86_STEPPING_ANY, feature, data)
 
-/*
- * Match specific microcode revisions.
- *
- * vendor/family/model/stepping must be all set.
- *
- * Only checks against the boot CPU.  When mixed-stepping configs are
- * valid for a CPU model, add a quirk for every valid stepping and
- * do the fine-tuning in the quirk handler.
- */
-
-struct x86_cpu_desc {
-	u8	x86_family;
-	u8	x86_vendor;
-	u8	x86_model;
-	u8	x86_stepping;
-	u32	x86_microcode_rev;
-};
-
-#define INTEL_CPU_DESC(vfm, stepping, revision) {		\
-	.x86_family		= VFM_FAMILY(vfm),		\
-	.x86_vendor		= VFM_VENDOR(vfm),		\
-	.x86_model		= VFM_MODEL(vfm),		\
-	.x86_stepping		= (stepping),			\
-	.x86_microcode_rev	= (revision),			\
-}
-
-#define AMD_CPU_DESC(fam, model, stepping, revision) {		\
-	.x86_family		= (fam),			\
-	.x86_vendor		= X86_VENDOR_AMD,		\
-	.x86_model		= (model),			\
-	.x86_stepping		= (stepping),			\
-	.x86_microcode_rev	= (revision),			\
-}
-
 extern const struct x86_cpu_id *x86_match_cpu(const struct x86_cpu_id *match);
-extern bool x86_cpu_has_min_microcode_rev(const struct x86_cpu_desc *table);
 extern bool x86_match_min_microcode_rev(const struct x86_cpu_id *table);
 
 #endif /* _ASM_X86_CPU_DEVICE_ID */
diff -puN arch/x86/kernel/cpu/match.c~zap-x86_cpu_desc-3 arch/x86/kernel/cpu/match.c
--- a/arch/x86/kernel/cpu/match.c~zap-x86_cpu_desc-3	2024-12-13 10:48:03.174376959 -0800
+++ b/arch/x86/kernel/cpu/match.c	2024-12-13 10:48:03.178377120 -0800
@@ -56,37 +56,6 @@ const struct x86_cpu_id *x86_match_cpu(c
 }
 EXPORT_SYMBOL(x86_match_cpu);
 
-static const struct x86_cpu_desc *
-x86_match_cpu_with_stepping(const struct x86_cpu_desc *match)
-{
-	struct cpuinfo_x86 *c = &boot_cpu_data;
-	const struct x86_cpu_desc *m;
-
-	for (m = match; m->x86_family | m->x86_model; m++) {
-		if (c->x86_vendor != m->x86_vendor)
-			continue;
-		if (c->x86 != m->x86_family)
-			continue;
-		if (c->x86_model != m->x86_model)
-			continue;
-		if (c->x86_stepping != m->x86_stepping)
-			continue;
-		return m;
-	}
-	return NULL;
-}
-
-bool x86_cpu_has_min_microcode_rev(const struct x86_cpu_desc *table)
-{
-	const struct x86_cpu_desc *res = x86_match_cpu_with_stepping(table);
-
-	if (!res || res->x86_microcode_rev > boot_cpu_data.microcode)
-		return false;
-
-	return true;
-}
-EXPORT_SYMBOL_GPL(x86_cpu_has_min_microcode_rev);
-
 bool x86_match_min_microcode_rev(const struct x86_cpu_id *table)
 {
 	const struct x86_cpu_id *res = x86_match_cpu(table);
_