Author: jhb
Date: Thu May 30 16:40:21 2019
New Revision: 348436
URL: https://svnweb.freebsd.org/changeset/base/348436
Log:
MFC 347964:
Expose the MD_CLEAR capability used by Intel MDS mitigations to guests.
Modified:
stable/12/sys/amd64/vmm/x86.c
Directory Properties:
stable/12/ (props changed)
Modified: stable/12/sys/amd64/vmm/x86.c
==============================================================================
--- stable/12/sys/amd64/vmm/x86.c Thu May 30 16:32:18 2019
(r348435)
+++ stable/12/sys/amd64/vmm/x86.c Thu May 30 16:40:21 2019
(r348436)
@@ -361,7 +361,7 @@ x86_emulate_cpuid(struct vm *vm, int vcpu_id,
CPUID_STDEXT_AVX512ER |
CPUID_STDEXT_AVX512CD);
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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