Ubuntu
qemu package

  1. Disco (19.04)
  2. Bug #1828495
  3. Comment #23

Comment 23 for bug 1828495

Revision history for this message
Christian Ehrhardt  (paelzer) wrote : Re: [Bug 1828495] Re: [KVM][CLX] CPUID_7_0_EDX_ARCH_CAPABILITIES is not enabled in VM.

> ssbd
> md-clear
> bpb
> ibrs-all
> rdctl-no
> rsba
> skip-l1dfl-vmentry
>
> I guess that we will have to backport this support in libvirt, in order
> to allow QEMU to pick specific CPU mitigation flags.

Those are not all missing at least. I have seen ssbd and md-clear for
sure in Bionic e.g. for the latter coming with
ubuntu/bionic-4.0:debian/patches/md-clear.patch

In the context of this bug we will take a look at arch_capabilities
and if some of the others are low hanging fruits.
Quite often - but not always - for libvirt it is just a CPU bit
definition, but as we know e.g. arch_cap is more complex.