tree bb1a937a6a240cf3782c63223ca9584de1a7b63f
parent b6b8a1451fc40412c57d10c94b62e22acab28f94
author Jan Kiszka <jan.kiszka@siemens.com> 1394218993 +0100
committer Paolo Bonzini <pbonzini@redhat.com> 1394523705 +0100

KVM: nVMX: Fully emulate preemption timer

We cannot rely on the hardware-provided preemption timer support because
we are holding L2 in HLT outside non-root mode. Furthermore, emulating
the preemption will resolve tick rate errata on older Intel CPUs.

The emulation is based on hrtimer which is started on L2 entry, stopped
on L2 exit and evaluated via the new check_nested_events hook. As we no
longer rely on hardware features, we can enable both the preemption
timer support and value saving unconditionally.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>