commit a4888486c5d755118a3c8a30416d7e0febdfb298
author Jan H. Schönherr <jschoenh@amazon.de> Wed Oct 25 16:43:26 2017 +0200
committer Paolo Bonzini <pbonzini@redhat.com> Thu Nov 02 18:27:11 2017 +0100
tree 5c0e2e0f193d2dadeeb6d576aad1341c36c9a065
parent 008755209ce1ae86c0f562a44810b57d9ea31a71

KVM: VMX: Do not fully reset PI descriptor on vCPU reset

Parts of the posted interrupt descriptor configure host behavior,
such as the notification vector and destination. Overwriting them
with zero as done during vCPU reset breaks posted interrupts.
KVM (re-)writes these fields on certain occasions and belatedly fixes
the situation in many cases. However, if you have a guest configured
with "idle=poll", for example, the fields might stay zero forever.

Do not reset the full descriptor in vmx_vcpu_reset(). Instead,
reset only the outstanding notifications and leave everything
else untouched.

Signed-off-by: Jan H. Schönherr <jschoenh@amazon.de>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>