Hi, Core2 is broken with 4.18.8+ kernels. VM boot ends with virtio
errors like devices refuse features or Error -2 initializing vqs.
Successfully bisected (v4.18.8 v4.18.7) to:
d9b47449c1a17be65332e07c1e8acba0f8b27e10 is the first bad commit
commit d9b47449c1a17be65332e07c1e8acba0f8b27e10
Author: Junaid Shahid <junaids@xxxxxxxxxx>
Date: Tue Aug 14 10:15:34 2018 -0700
kvm: x86: Set highest physical address bits in non-present/reserved
SPTEs
commit 28a1f3ac1d0c8558ee4453d9634dad891a6e922e upstream.
Always set the 5 upper-most supported physical address bits to 1
for SPTEs
that are marked as non-present or reserved, to make them unusable for
L1TF attacks from the guest. Currently, this just applies to MMIO
SPTEs.
(We do not need to mark PTEs that are completely 0 as physical page 0
is already reserved.)
This allows mitigation of L1TF without disabling hyper-threading by
using
shadow paging mode instead of EPT.
Signed-off-by: Junaid Shahid <junaids@xxxxxxxxxx>
Signed-off-by: Paolo Bonzini <pbonzini@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
:040000 040000 1e535944156e32133ad6ad21d6be39b192a8264b
69bd6e678235077fb516cf67ef7817423ba6f84e M arch
Without this commit old Core2 works fine...
TIA, Z.
