Hmm with that workaround for 4.15 I get the md bug affects in the guest, but not the md-clear feature.
$ uname -r; cat /sys/devices/system/cpu/vulnerabilities/mds; cat /proc/cpuinfo | grep -e ^bug -e ^flags | grep md 4.15.0-50-generic Vulnerable: Clear CPU buffers attempted, no microcode; SMT Host state unknown bugs : cpu_meltdown spectre_v1 spectre_v2 spec_store_bypass l1tf mds Despite the commandline adding the feature -cpu kvm64,+ssbd,+md-clear,+pdpe1gb,+pcid Maybe going down to "kvm64" was too much. I was looking for a middle ground for a while, but it seems in this combination "T3.13/Q2.0/B4.15" I can only get it either hang or being without the md-clear. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1829555 Title: nested virtualization w/first level trusty guests has odd MDS behavior To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1829555/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
