commit 41628d334361670d825fb03c04568f5ef9f084dc
author Konstantin Weitz <WEITZKON@de.ibm.com> Wed Apr 25 15:30:38 2012 +0200
committer Marcelo Tosatti <mtosatti@redhat.com> Mon Apr 30 21:38:31 2012 -0300
tree 88b2eadd0f7de12f1d8b226e4491532b8783ee94
parent b6ddf05ff68d81a7c1736717faf492b70e9bf4f9

KVM: s390: Implement the directed yield (diag 9c) hypervisor call for KVM

This patch implements the directed yield hypercall found on other
System z hypervisors. It delegates execution time to the virtual cpu
specified in the instruction's parameter.

Useful to avoid long spinlock waits in the guest.

Christian Borntraeger: moved common code in virt/kvm/

Signed-off-by: Konstantin Weitz <WEITZKON@de.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>