Date: Thu, 22 May 2014 18:22:03 +0000 (UTC) From: John Baldwin <jhb@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r266552 - head/sys/amd64/amd64 Message-ID: <201405221822.s4MIM3NO091765@svn.freebsd.org>
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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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