linux-kernel - [tip:x86/cpu] x86, cpu: Expand cpufeature facility to include cpu bugs

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Message-ID: <tip-65fc985b37dc241c4db7cd32adcbc989193fe3c8@git.kernel.org>
Date:	Tue, 2 Apr 2013 12:32:27 -0700
From:	tip-bot for Borislav Petkov <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, hpa@...or.com, mingo@...nel.org,
	tglx@...utronix.de, bp@...e.de
Subject: [tip:x86/cpu] x86, cpu:
  Expand cpufeature facility to include cpu bugs

Commit-ID:  65fc985b37dc241c4db7cd32adcbc989193fe3c8
Gitweb:     http://git.kernel.org/tip/65fc985b37dc241c4db7cd32adcbc989193fe3c8
Author:     Borislav Petkov <bp@...e.de>
AuthorDate: Wed, 20 Mar 2013 15:07:23 +0100
Committer:  H. Peter Anvin <hpa@...or.com>
CommitDate: Tue, 2 Apr 2013 10:12:52 -0700

x86, cpu: Expand cpufeature facility to include cpu bugs

We add another 32-bit vector at the end of the ->x86_capability
bitvector which collects bugs present in CPUs. After all, a CPU bug is a
kind of a capability, albeit a strange one.

Signed-off-by: Borislav Petkov <bp@...e.de>
Link: http://lkml.kernel.org/r/1363788448-31325-2-git-send-email-bp@alien8.de
Signed-off-by: H. Peter Anvin <hpa@...or.com>
---
 arch/x86/include/asm/cpufeature.h | 13 +++++++++++++
 arch/x86/include/asm/processor.h  |  2 +-
 arch/x86/kernel/alternative.c     |  2 +-
 arch/x86/kernel/cpu/common.c      |  4 ++++
 4 files changed, 19 insertions(+), 2 deletions(-)

diff --git a/arch/x86/include/asm/cpufeature.h b/arch/x86/include/asm/cpufeature.h
index 93fe929..16190ab 100644
--- a/arch/x86/include/asm/cpufeature.h
+++ b/arch/x86/include/asm/cpufeature.h
@@ -9,6 +9,7 @@
 #endif
 
 #define NCAPINTS	10	/* N 32-bit words worth of info */
+#define NBUGINTS	1	/* N 32-bit bug flags */
 
 /*
  * Note: If the comment begins with a quoted string, that string is used
@@ -216,6 +217,11 @@
 #define X86_FEATURE_ADX		(9*32+19) /* The ADCX and ADOX instructions */
 #define X86_FEATURE_SMAP	(9*32+20) /* Supervisor Mode Access Prevention */
 
+/*
+ * BUG word(s)
+ */
+#define X86_BUG(x)		(NCAPINTS*32 + (x))
+
 #if defined(__KERNEL__) && !defined(__ASSEMBLY__)
 
 #include <asm/asm.h>
@@ -401,6 +407,13 @@ static __always_inline __pure bool __static_cpu_has(u16 bit)
 #define static_cpu_has(bit) boot_cpu_has(bit)
 #endif
 
+#define cpu_has_bug(c, bit)	cpu_has(c, (bit))
+#define set_cpu_bug(c, bit)	set_cpu_cap(c, (bit))
+#define clear_cpu_bug(c, bit)	clear_cpu_cap(c, (bit));
+
+#define static_cpu_has_bug(bit)	static_cpu_has((bit))
+#define boot_cpu_has_bug(bit)	cpu_has_bug(&boot_cpu_data, (bit))
+
 #endif /* defined(__KERNEL__) && !defined(__ASSEMBLY__) */
 
 #endif /* _ASM_X86_CPUFEATURE_H */
diff --git a/arch/x86/include/asm/processor.h b/arch/x86/include/asm/processor.h
index 3270116..23c8081 100644
--- a/arch/x86/include/asm/processor.h
+++ b/arch/x86/include/asm/processor.h
@@ -107,7 +107,7 @@ struct cpuinfo_x86 {
 	__u32			extended_cpuid_level;
 	/* Maximum supported CPUID level, -1=no CPUID: */
 	int			cpuid_level;
-	__u32			x86_capability[NCAPINTS];
+	__u32			x86_capability[NCAPINTS + NBUGINTS];
 	char			x86_vendor_id[16];
 	char			x86_model_id[64];
 	/* in KB - valid for CPUS which support this call: */
diff --git a/arch/x86/kernel/alternative.c b/arch/x86/kernel/alternative.c
index ef5ccca..c15cf9a 100644
--- a/arch/x86/kernel/alternative.c
+++ b/arch/x86/kernel/alternative.c
@@ -271,7 +271,7 @@ void __init_or_module apply_alternatives(struct alt_instr *start,
 		replacement = (u8 *)&a->repl_offset + a->repl_offset;
 		BUG_ON(a->replacementlen > a->instrlen);
 		BUG_ON(a->instrlen > sizeof(insnbuf));
-		BUG_ON(a->cpuid >= NCAPINTS*32);
+		BUG_ON(a->cpuid >= (NCAPINTS + NBUGINTS) * 32);
 		if (!boot_cpu_has(a->cpuid))
 			continue;
 
diff --git a/arch/x86/kernel/cpu/common.c b/arch/x86/kernel/cpu/common.c
index d814772..22018f7 100644
--- a/arch/x86/kernel/cpu/common.c
+++ b/arch/x86/kernel/cpu/common.c
@@ -920,6 +920,10 @@ static void __cpuinit identify_cpu(struct cpuinfo_x86 *c)
 		/* AND the already accumulated flags with these */
 		for (i = 0; i < NCAPINTS; i++)
 			boot_cpu_data.x86_capability[i] &= c->x86_capability[i];
+
+		/* OR, i.e. replicate the bug flags */
+		for (i = NCAPINTS; i < NCAPINTS + NBUGINTS; i++)
+			c->x86_capability[i] |= boot_cpu_data.x86_capability[i];
 	}
 
 	/* Init Machine Check Exception if available. */
--
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