Author: jhb
Date: Thu May 30 16:42:57 2019
New Revision: 348437
URL: https://svnweb.freebsd.org/changeset/base/348437
Log:
MFC 347964:
Expose the MD_CLEAR capability used by Intel MDS mitigations to guests.
Approved by: re (gjb)
Modified:
stable/11/sys/amd64/vmm/x86.c
Directory Properties:
stable/11/ (props changed)
Modified: stable/11/sys/amd64/vmm/x86.c
==============================================================================
--- stable/11/sys/amd64/vmm/x86.c Thu May 30 16:40:21 2019
(r348436)
+++ stable/11/sys/amd64/vmm/x86.c Thu May 30 16:42:57 2019
(r348437)
@@ -359,7 +359,7 @@ 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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