TL;DR only occurs with HWE kernel - odd
Results of: $ cat /sys/devices/system/cpu/vulnerabilities/mds
Host Bionic: 4.18.0-20-generic / 2.11+dfsg-1ubuntu7.13
Guest-lvl1: 3.13.0-170-generic / 2.0.0+dfsg-2ubuntu1.46 Vulnerable: Clear CPU buffers attempted, SMT Host state unknown Guest-lvl2: 3.13.0-170-generic Vulnerable: Clear CPU buffers attempted, no microcode; SMT Host state unknown
It is "ok" that without passthrough it hits "Clear CPU buffers attempted"
Using passthrough: Guest-lvl1: 3.13.0-170-generic / 2.0.0+dfsg-2ubuntu1.46 + passthrough Mitigation: Clear CPU buffers; SMT Host state unknown Guest-lvl2: 3.13.0-170-generic + passthrough Mitigation: Clear CPU buffers; SMT Host state unknown
So this does not trigger witrh 3.13 kernels for me.
Upgrading to 4.4 in both trusty levels now.
Guest-lvl1: 4.4.0-148-generic / 2.0.0+dfsg-2ubuntu1.46 + passthrough Mitigation: Clear CPU buffers; SMT Host state unknown Guest-lvl1: 4.4.0-148-generic $ cat /sys/devices/system/cpu/vulnerabilities/mds Not affected
TL;DR only occurs with HWE kernel - odd
Results of: system/ cpu/vulnerabili ties/mds
$ cat /sys/devices/
Host Bionic: 4.18.0-20-generic / 2.11+dfsg- 1ubuntu7. 13
Guest-lvl1: 3.13.0-170-generic / 2.0.0+dfsg- 2ubuntu1. 46
Vulnerable: Clear CPU buffers attempted, SMT Host state unknown
Guest-lvl2: 3.13.0-170-generic
Vulnerable: Clear CPU buffers attempted, no microcode; SMT Host state unknown
It is "ok" that without passthrough it hits "Clear CPU buffers attempted"
Using passthrough: 2ubuntu1. 46 + passthrough
Guest-lvl1: 3.13.0-170-generic / 2.0.0+dfsg-
Mitigation: Clear CPU buffers; SMT Host state unknown
Guest-lvl2: 3.13.0-170-generic + passthrough
Mitigation: Clear CPU buffers; SMT Host state unknown
So this does not trigger witrh 3.13 kernels for me.
Upgrading to 4.4 in both trusty levels now.
Guest-lvl1: 4.4.0-148-generic / 2.0.0+dfsg- 2ubuntu1. 46 + passthrough system/ cpu/vulnerabili ties/mds
Mitigation: Clear CPU buffers; SMT Host state unknown
Guest-lvl1: 4.4.0-148-generic
$ cat /sys/devices/
Not affected