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x86/fpu/xstate: Align xstate components according to CPUID 

CPUID function 0x0d, sub function (i, i > 1) returns in ecx[1] the
alignment requirement of component 'i' when the compacted format is used.

If ecx[1] is 0, component 'i' is located immediately following the preceding
component. If ecx[1] is 1, component 'i' is located on the next 64-byte
boundary following the preceding component.

Signed-off-by: Yu-cheng Yu <yu-cheng.yu@intel.com>
Reviewed-by: Dave Hansen <dave.hansen@intel.com>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: Fenghua Yu <fenghua.yu@intel.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Quentin Casasnovas <quentin.casasnovas@oracle.com>
Cc: Ravi V. Shankar <ravi.v.shankar@intel.com>
Cc: Sai Praneeth Prakhya <sai.praneeth.prakhya@intel.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/331e2bef1a0a7a584f06adde095b6bbfbe166472.1466179491.git.yu-cheng.yu@intel.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Yu-cheng Yu 2016-06-17 13:07:15 -07:00 committed by Ingo Molnar
parent 08fb98f5bf
commit 03482e08a8
1 changed files with 32 additions and 28 deletions
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60
arch/x86/kernel/fpu/xstate.c
View File

@ -269,6 +269,33 @@ static void __init print_xstate_features(void)
print_xstate_feature(XFEATURE_MASK_PKRU);
}
/*
* This check is important because it is easy to get XSTATE_*
* confused with XSTATE_BIT_*.
*/
#define CHECK_XFEATURE(nr) do { \
WARN_ON(nr < FIRST_EXTENDED_XFEATURE); \
WARN_ON(nr >= XFEATURE_MAX); \
} while (0)
/*
* We could cache this like xstate_size[], but we only use
* it here, so it would be a waste of space.
*/
static int xfeature_is_aligned(int xfeature_nr)
{
u32 eax, ebx, ecx, edx;
CHECK_XFEATURE(xfeature_nr);
cpuid_count(XSTATE_CPUID, xfeature_nr, &eax, &ebx, &ecx, &edx);
/*
* The value returned by ECX[1] indicates the alignment
* of state component 'i' when the compacted format
* of the extended region of an XSAVE area is used:
*/
return !!(ecx & 2);
}
/*
* This function sets up offsets and sizes of all extended states in
* xsave area. This supports both standard format and compacted format
@ -306,10 +333,14 @@ static void __init setup_xstate_comp(void)
else
xstate_comp_sizes[i] = 0;
if (i > FIRST_EXTENDED_XFEATURE)
if (i > FIRST_EXTENDED_XFEATURE) {
xstate_comp_offsets[i] = xstate_comp_offsets[i-1]
+ xstate_comp_sizes[i-1];
if (xfeature_is_aligned(i))
xstate_comp_offsets[i] =
ALIGN(xstate_comp_offsets[i], 64);
}
}
}
@ -366,33 +397,6 @@ static int xfeature_is_user(int xfeature_nr)
}
*/
/*
* This check is important because it is easy to get XSTATE_*
* confused with XSTATE_BIT_*.
*/
#define CHECK_XFEATURE(nr) do { \
WARN_ON(nr < FIRST_EXTENDED_XFEATURE); \
WARN_ON(nr >= XFEATURE_MAX); \
} while (0)
/*
* We could cache this like xstate_size[], but we only use
* it here, so it would be a waste of space.
*/
static int xfeature_is_aligned(int xfeature_nr)
{
u32 eax, ebx, ecx, edx;
CHECK_XFEATURE(xfeature_nr);
cpuid_count(XSTATE_CPUID, xfeature_nr, &eax, &ebx, &ecx, &edx);
/*
* The value returned by ECX[1] indicates the alignment
* of state component i when the compacted format
* of the extended region of an XSAVE area is used
*/
return !!(ecx & 2);
}
static int xfeature_uncompacted_offset(int xfeature_nr)
{
u32 eax, ebx, ecx, edx;