Author: kib
Date: Wed Jan 31 14:25:42 2018
New Revision: 328624
URL: https://svnweb.freebsd.org/changeset/base/328624
Log:
Do not enable PTI when IA32_ARCH_CAP_RDCL_NO bit is set.
Intel document 336996-001 claims that this will be the way to inform
about Meltdown correction.
Sponsored by: The FreeBSD Foundation
MFC after: 1 week
Modified:
head/sys/x86/x86/identcpu.c
Modified: head/sys/x86/x86/identcpu.c
==============================================================================
--- head/sys/x86/x86/identcpu.c Wed Jan 31 13:40:36 2018 (r328623)
+++ head/sys/x86/x86/identcpu.c Wed Jan 31 14:25:42 2018 (r328624)
@@ -1614,7 +1614,8 @@ pti_get_default(void)
if (strcmp(cpu_vendor, AMD_VENDOR_ID) == 0)
return (0);
-
+ if ((cpu_ia32_arch_caps & IA32_ARCH_CAP_RDCL_NO) != 0)
+ return (0);
return (1);
}
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