tree a10fa41fc89e96d8c4f8082631be28981e056ad7
parent 8b79feffeca28c5459458fe78676b081e87c93a4
author Vitaly Kuznetsov <vkuznets@redhat.com> 1618403742 +0200
committer Paolo Bonzini <pbonzini@redhat.com> 1620381970 -0400

x86/kvm: Disable kvmclock on all CPUs on shutdown

Currenly, we disable kvmclock from machine_shutdown() hook and this
only happens for boot CPU. We need to disable it for all CPUs to
guard against memory corruption e.g. on restore from hibernate.

Note, writing '0' to kvmclock MSR doesn't clear memory location, it
just prevents hypervisor from updating the location so for the short
while after write and while CPU is still alive, the clock remains usable
and correct so we don't need to switch to some other clocksource.

Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Message-Id: <20210414123544.1060604-4-vkuznets@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>