Pre Post capabilities on a new AMD system
ubuntu@riccioli:~$ diff -Naur old.c.xml new.c.xml
--- old.c.xml 2019-08-22 12:51:25.065200903 +0000
+++ new.c.xml 2019-08-22 12:52:08.042076692 +0000
@@ -26,6 +26,7 @@
<feature name='perfctr_core'/>
<feature name='perfctr_nb'/>
<feature name='invtsc'/>
+ <feature name='amd-ssbd'/>
<pages unit='KiB' size='4'/>
<pages unit='KiB' size='2048'/>
<pages unit='KiB' size='1048576'/>
domcapabilities
@@ -28,6 +28,7 @@
<feature policy='require' name='clwb'/>
<feature policy='require' name='cmp_legacy'/>
<feature policy='require' name='invtsc'/>
+ <feature policy='require' name='amd-ssbd'/>
<feature policy='disable' name='monitor'/>
</mode>
<mode name='custom' supported='yes'>
With that feature set I see
<feature policy='require' name='amd-ssbd'/>
converted to
-cpu EPYC-IBPB,...,amd-ssbd=on
And the guest starts fine with it.
And the same way
<feature policy='disable' name='amd-ssbd'/>
becomes
,amd-ssbd=off
Things seem fine, but as I got access I wanted to pre check this for the SRU.
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https://bugs.launchpad.net/bugs/1840745
Title:
backport extended amd spectre mitigations
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