Resume starts CPU from the init state, which clears any loaded microcode updates. As result, IBRS MSRs are no longer available, until the microcode is reloaded. I have to forcibly clear cpu_stdext_feature3, which assumes that CPUID leaf 7 reg %ebx does not report anything except Meltdown/Spectre bugs bits. If future CPUs add new bits there, hw_ibrs_recalculate() and identify_cpu1()/identify_cpu2() need to be adjusted for that. Submitted and tested by: Michael Danilov <mike.d.ft402@gmail.com> PR: 227866 Sponsored by: The FreeBSD Foundation MFC after: 1 week Differential revision: https://reviews.freebsd.org/D15236 |
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acpica | ||
bios | ||
cpufreq | ||
include | ||
iommu | ||
isa | ||
pci | ||
x86 | ||
xen |