Author: scottl
Date: Tue Dec 10 18:57:39 2019
New Revision: 355589
URL: https://svnweb.freebsd.org/changeset/base/355589
Log:
Fix the TAA state machine to do the right thing when the TAA
migitation is available in microcode and the operator has set
the sysctl to automatic mode.
Reported by: Coverity
CID: 1408334
MFC after: 3 days
Sponsored by: Intel
Modified:
head/sys/x86/x86/cpu_machdep.c
Modified: head/sys/x86/x86/cpu_machdep.c
==============================================================================
--- head/sys/x86/x86/cpu_machdep.c Tue Dec 10 18:50:50 2019
(r355588)
+++ head/sys/x86/x86/cpu_machdep.c Tue Dec 10 18:57:39 2019
(r355589)
@@ -1254,8 +1254,7 @@ x86_taa_recalculate(void)
/* Check to see what mitigation options the CPU gives us */
if (cpu_ia32_arch_caps & IA32_ARCH_CAP_TAA_NO) {
/* CPU is not suseptible to TAA */
- taa_need = TAA_NONE;
- taa_state = TAA_TAA_UC;
+ taa_need = TAA_TAA_UC;
} else if (cpu_ia32_arch_caps & IA32_ARCH_CAP_TSX_CTRL) {
/*
* CPU can turn off TSX. This is the next best option
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