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x86/cpufeature, x86/mm/pkeys: Fix broken compile-time disabling of pkeys

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When I added support for the Memory Protection Keys processor
feature, I had to reindent the REQUIRED/DISABLED_MASK macros, and
also consult the later cpufeature words.

I'm not quite sure how I bungled it, but I consulted the wrong
word at the end.  This only affected required or disabled cpu
features in cpufeature words 14, 15 and 16.  So, only Protection
Keys itself was screwed over here.

The result was that if you disabled pkeys in your .config, you
might still see some code show up that should have been compiled
out.  There should be no functional problems, though.

In verifying this patch I also realized that the DISABLE_PKU/OSPKE
macros were defined backwards and that the cpu_has() check in
setup_pku() was not doing the compile-time disabled checks.

So also fix the macro for DISABLE_PKU/OSPKE and add a compile-time
check for pkeys being enabled in setup_pku().

Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com>
Cc: <stable@vger.kernel.org>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Dave Hansen <dave@sr71.net>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Vince Weaver <vincent.weaver@maine.edu>
Fixes: dfb4a70f20 ("x86/cpufeature, x86/mm/pkeys: Add protection keys related CPUID definitions")
Link: http://lkml.kernel.org/r/20160513221328.C200930B@viggo.jf.intel.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Dave Hansen 2016-05-13 15:13:28 -07:00 committed by Ingo Molnar
parent e2724e9d96
commit e8df1a95b6
3 changed files with 13 additions and 9 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

12
arch/x86/include/asm/cpufeature.h
View File

@ -63,9 +63,9 @@ extern const char * const x86_bug_flags[NBUGINTS*32];
(((bit)>>5)==11 && (1UL<<((bit)&31) & REQUIRED_MASK11)) || \
(((bit)>>5)==12 && (1UL<<((bit)&31) & REQUIRED_MASK12)) || \
(((bit)>>5)==13 && (1UL<<((bit)&31) & REQUIRED_MASK13)) || \
(((bit)>>5)==13 && (1UL<<((bit)&31) & REQUIRED_MASK14)) || \
(((bit)>>5)==13 && (1UL<<((bit)&31) & REQUIRED_MASK15)) || \
(((bit)>>5)==14 && (1UL<<((bit)&31) & REQUIRED_MASK16)) )
(((bit)>>5)==14 && (1UL<<((bit)&31) & REQUIRED_MASK14)) || \
(((bit)>>5)==15 && (1UL<<((bit)&31) & REQUIRED_MASK15)) || \
(((bit)>>5)==16 && (1UL<<((bit)&31) & REQUIRED_MASK16)) )
#define DISABLED_MASK_BIT_SET(bit) \
( (((bit)>>5)==0 && (1UL<<((bit)&31) & DISABLED_MASK0 )) || \
@ -82,9 +82,9 @@ extern const char * const x86_bug_flags[NBUGINTS*32];
(((bit)>>5)==11 && (1UL<<((bit)&31) & DISABLED_MASK11)) || \
(((bit)>>5)==12 && (1UL<<((bit)&31) & DISABLED_MASK12)) || \
(((bit)>>5)==13 && (1UL<<((bit)&31) & DISABLED_MASK13)) || \
(((bit)>>5)==13 && (1UL<<((bit)&31) & DISABLED_MASK14)) || \
(((bit)>>5)==13 && (1UL<<((bit)&31) & DISABLED_MASK15)) || \
(((bit)>>5)==14 && (1UL<<((bit)&31) & DISABLED_MASK16)) )
(((bit)>>5)==14 && (1UL<<((bit)&31) & DISABLED_MASK14)) || \
(((bit)>>5)==15 && (1UL<<((bit)&31) & DISABLED_MASK15)) || \
(((bit)>>5)==16 && (1UL<<((bit)&31) & DISABLED_MASK16)) )
#define cpu_has(c, bit) \
(__builtin_constant_p(bit) && REQUIRED_MASK_BIT_SET(bit) ? 1 : \

6
arch/x86/include/asm/disabled-features.h
View File

@ -29,11 +29,11 @@
#endif /* CONFIG_X86_64 */
#ifdef CONFIG_X86_INTEL_MEMORY_PROTECTION_KEYS
# define DISABLE_PKU (1<<(X86_FEATURE_PKU))
# define DISABLE_OSPKE (1<<(X86_FEATURE_OSPKE))
#else
# define DISABLE_PKU 0
# define DISABLE_OSPKE 0
#else
# define DISABLE_PKU (1<<(X86_FEATURE_PKU & 31))
# define DISABLE_OSPKE (1<<(X86_FEATURE_OSPKE & 31))
#endif /* CONFIG_X86_INTEL_MEMORY_PROTECTION_KEYS */
/*

4
arch/x86/kernel/cpu/common.c
View File

@ -310,6 +310,10 @@ static bool pku_disabled;
static __always_inline void setup_pku(struct cpuinfo_x86 *c)
{
/* check the boot processor, plus compile options for PKU: */
if (!cpu_feature_enabled(X86_FEATURE_PKU))
return;
/* checks the actual processor's cpuid bits: */
if (!cpu_has(c, X86_FEATURE_PKU))
return;
if (pku_disabled)