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x86/fpu: Print supported xstate features in human readable way

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Inform the user/admin about which xstate features the kernel supports.

Reviewed-by: Borislav Petkov <bp@alien8.de>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Fenghua Yu <fenghua.yu@intel.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Ingo Molnar 2015-04-24 08:48:01 +02:00
parent 32d4d9ccb0
commit 69496e10f8
1 changed files with 25 additions and 0 deletions
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25
arch/x86/kernel/fpu/xsave.c
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@ -482,6 +482,30 @@ static void __init setup_xstate_features(void)
} while (1);
}
static void print_xstate_feature(u64 xstate_mask, const char *desc)
{
if (pcntxt_mask & xstate_mask) {
int xstate_feature = fls64(xstate_mask)-1;
pr_info("x86/fpu: Supporting XSAVE feature %2d: '%s'\n", xstate_feature, desc);
}
}
/*
* Print out all the supported xstate features:
*/
static void print_xstate_features(void)
{
print_xstate_feature(XSTATE_FP, "x87 floating point registers");
print_xstate_feature(XSTATE_SSE, "SSE registers");
print_xstate_feature(XSTATE_YMM, "AVX registers");
print_xstate_feature(XSTATE_BNDREGS, "MPX bounds registers");
print_xstate_feature(XSTATE_BNDCSR, "MPX CSR");
print_xstate_feature(XSTATE_OPMASK, "AVX-512 opmask");
print_xstate_feature(XSTATE_ZMM_Hi256, "AVX-512 Hi256");
print_xstate_feature(XSTATE_Hi16_ZMM, "AVX-512 ZMM_Hi256");
}
/*
* This function sets up offsets and sizes of all extended states in
* xsave area. This supports both standard format and compacted format
@ -545,6 +569,7 @@ static void __init setup_init_fpu_buf(void)
return;
setup_xstate_features();
print_xstate_features();
if (cpu_has_xsaves) {
init_xstate_buf->xsave_hdr.xcomp_bv =