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Don't permit users to request a subset of the AVX512 or MPX xsave masks.

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These masks are documented in the Intel Architecture Instruction Set
Extensions Programming Reference (March 2014).

Reviewed by:	kib
MFC after:	1 month
This commit is contained in:
jhb 2014-05-22 18:22:02 +00:00
parent 5662e763a6
commit 9578fc0e8e
1 changed files with 4 additions and 0 deletions
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4
sys/amd64/amd64/fpu.c
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@ -199,6 +199,10 @@ fpuinit_bsp1(void)
TUNABLE_ULONG_FETCH("hw.xsave_mask", &xsave_mask_user);
xsave_mask_user |= XFEATURE_ENABLED_X87 | XFEATURE_ENABLED_SSE;
xsave_mask &= xsave_mask_user;
if ((xsave_mask & XFEATURE_AVX512) != XFEATURE_AVX512)
xsave_mask &= ~XFEATURE_AVX512;
if ((xsave_mask & XFEATURE_MPX) != XFEATURE_MPX)
xsave_mask &= ~XFEATURE_MPX;
cpuid_count(0xd, 0x1, cp);
if ((cp[0] & CPUID_EXTSTATE_XSAVEOPT) != 0) {