[tip: x86/cpu] x86/cpu: Introduce new microcode matching helper

[tip-bot2 for Dave Hansen]

The following commit has been merged into the x86/cpu branch of tip:

Commit-ID:     b8e10c86e674eb19e0e53dcf4fa3e71cba1e0c1c
Gitweb:        https://git.kernel.org/tip/b8e10c86e674eb19e0e53dcf4fa3e71cba1e0c1c
Author:        Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>
AuthorDate:    Fri, 13 Dec 2024 10:51:28 -08:00
Committer:     Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>
CommitterDate: Tue, 17 Dec 2024 16:14:39 -08:00

x86/cpu: Introduce new microcode matching helper

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@xxxxxxxxxxxxxxx>
Link: https://lore.kernel.org/all/20241213185128.8F24EEFC%40davehans-spike.ostc.intel.com
---
 arch/x86/include/asm/cpu_device_id.h |  1 +
 arch/x86/kernel/cpu/match.c          | 11 +++++++++++
 2 files changed, 12 insertions(+)

diff --git a/arch/x86/include/asm/cpu_device_id.h b/arch/x86/include/asm/cpu_device_id.h
index e4121d9..9c77dbe 100644
--- a/arch/x86/include/asm/cpu_device_id.h
+++ b/arch/x86/include/asm/cpu_device_id.h
@@ -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 --git a/arch/x86/kernel/cpu/match.c b/arch/x86/kernel/cpu/match.c
index 8e7de73..2de2a83 100644
--- a/arch/x86/kernel/cpu/match.c
+++ b/arch/x86/kernel/cpu/match.c
@@ -86,3 +86,14 @@ bool x86_cpu_has_min_microcode_rev(const struct x86_cpu_desc *table)
 	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);