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authorKan Liang <kan.liang@linux.intel.com>2019-02-04 14:23:29 -0800
committerIngo Molnar <mingo@kernel.org>2019-02-11 07:59:23 +0100
commit0f42b790c9ba5ec2f25b7da8b0b6d361082d67b0 (patch)
tree8e4ac678e108e774930756ac4e477389eb66b129 /arch/x86/include/asm
parent0237199186e7a4aa5310741f0a6498a20c820fd7 (diff)
downloadlinux-0-day-0f42b790c9ba5ec2f25b7da8b0b6d361082d67b0.tar.gz
linux-0-day-0f42b790c9ba5ec2f25b7da8b0b6d361082d67b0.tar.xz
x86/cpufeature: Add facility to check for min microcode revisions
For bug workarounds or checks, it is useful to check for specific microcode revisions. Add a new generic function to match the CPU with stepping. Add the other function to check the min microcode revisions for the matched CPU. A new table format is introduced to facilitate the quirk to fill the related information. This does not change the existing x86_cpu_id because it's an ABI shared with modules, and also has quite different requirements, as in no wildcards, but everything has to be matched exactly. Originally-by: Andi Kleen <ak@linux.intel.com> Suggested-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Kan Liang <kan.liang@linux.intel.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Acked-by: Borislav Petkov <bp@alien8.de> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: eranian@google.com Link: https://lkml.kernel.org/r/1549319013-4522-1-git-send-email-kan.liang@linux.intel.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'arch/x86/include/asm')
-rw-r--r--arch/x86/include/asm/cpu_device_id.h28
1 files changed, 28 insertions, 0 deletions
diff --git a/arch/x86/include/asm/cpu_device_id.h b/arch/x86/include/asm/cpu_device_id.h
index baeba0567126..3417110574c1 100644
--- a/arch/x86/include/asm/cpu_device_id.h
+++ b/arch/x86/include/asm/cpu_device_id.h
@@ -11,4 +11,32 @@
extern const struct x86_cpu_id *x86_match_cpu(const struct x86_cpu_id *match);
+/*
+ * 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(mod, step, rev) { \
+ .x86_family = 6, \
+ .x86_vendor = X86_VENDOR_INTEL, \
+ .x86_model = mod, \
+ .x86_stepping = step, \
+ .x86_microcode_rev = rev, \
+}
+
+extern bool x86_cpu_has_min_microcode_rev(const struct x86_cpu_desc *table);
+
#endif