Ubuntu
linux package

  1. Bug #1742995
  2. Comment #2

Comment 2 for bug 1742995

Revision history for this message
Vincent Bernat (vbernat) wrote :

Hey!

The patchset seems incomplete: 8339cae23d79be97a38df3852ef5dab870806a58 should add speculative control CPUID support for guests but only the AMD part is here. When running a guest on top of KVM, CPUID doesn't contain the spec-ctrl bit.

I am using this patch instead:
 https://github.com/exoscale/pkg-kernel-4.4/blob/4d0b19ad0379ba20846634e21ec01922222a9326/debian/patches/ibrs%2Bkvm/27-kvm-x86-add-speculative-control-cpuid-support-for-guests.patch

It also needs the following patch:
 https://github.com/exoscale/pkg-kernel-4.4/blob/4d0b19ad0379ba20846634e21ec01922222a9326/debian/patches/ibrs%2Bkvm/32-x86-provide-get-scattered-cpuid-leaf.patch