Description: information leak within a KVM guest
References:
 https://www.openwall.com/lists/oss-security/2020/01/30/4
Notes:
 carnil> Issue present since 0b9f6c4615c99 ("x86/kvm: Support the vCPU
 carnil> preemption check") in 4.10-rc1. But might need double-check.
Bugs:
upstream: needed
4.19-upstream-stable: needed
4.9-upstream-stable:
3.16-upstream-stable:
sid: needed
4.19-buster-security: needed
4.9-stretch-security:
3.16-jessie-security: