Date: Sat, 18 May 2019 21:20:39 +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: r347964 - head/sys/amd64/vmm Message-ID: <201905182120.x4ILKdwG054657@repo.freebsd.org>
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Author: jhb Date: Sat May 18 21:20:38 2019 New Revision: 347964 URL: https://svnweb.freebsd.org/changeset/base/347964 Log: Expose the MD_CLEAR capability used by Intel MDS mitigations to guests. Submitted by: Patrick Mooney <pmooney@pfmooney.com> Reviewed by: kib Tested by: Patrick on SmartOS with Linux and Windows guests Obtained from: Joyent MFC after: 3 days Differential Revision: https://reviews.freebsd.org/D20296 Modified: head/sys/amd64/vmm/x86.c Modified: head/sys/amd64/vmm/x86.c ============================================================================== --- head/sys/amd64/vmm/x86.c Sat May 18 21:01:36 2019 (r347963) +++ head/sys/amd64/vmm/x86.c Sat May 18 21:20:38 2019 (r347964) @@ -437,7 +437,7 @@ x86_emulate_cpuid(struct vm *vm, int vcpu_id, CPUID_STDEXT_AVX512ER | CPUID_STDEXT_AVX512CD | CPUID_STDEXT_SHA); regs[2] = 0; - regs[3] = 0; + regs[3] &= CPUID_STDEXT3_MD_CLEAR; /* Advertise INVPCID if it is enabled. */ error = vm_get_capability(vm, vcpu_id,
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