Author: jhb
Date: Thu May 22 18:22:02 2014
New Revision: 266552
URL: http://svnweb.freebsd.org/changeset/base/266552
Log:
Don't permit users to request a subset of the AVX512 or MPX xsave masks.
These masks are documented in the Intel Architecture Instruction Set
Extensions Programming Reference (March 2014).
Reviewed by: kib
MFC after: 1 month
Modified:
head/sys/amd64/amd64/fpu.c
Modified: head/sys/amd64/amd64/fpu.c
==============================================================================
--- head/sys/amd64/amd64/fpu.c Thu May 22 18:13:17 2014 (r266551)
+++ head/sys/amd64/amd64/fpu.c Thu May 22 18:22:02 2014 (r266552)
@@ -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) {
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