From 41628d334361670d825fb03c04568f5ef9f084dc Mon Sep 17 00:00:00 2001 From: Konstantin Weitz Date: Wed, 25 Apr 2012 15:30:38 +0200 Subject: 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 Signed-off-by: Christian Borntraeger Signed-off-by: Marcelo Tosatti --- include/linux/kvm_host.h | 1 + 1 file changed, 1 insertion(+) (limited to 'include/linux') diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h index 6f343307d72b..cae342d29d1b 100644 --- a/include/linux/kvm_host.h +++ b/include/linux/kvm_host.h @@ -461,6 +461,7 @@ void mark_page_dirty_in_slot(struct kvm *kvm, struct kvm_memory_slot *memslot, void kvm_vcpu_block(struct kvm_vcpu *vcpu); void kvm_vcpu_kick(struct kvm_vcpu *vcpu); +bool kvm_vcpu_yield_to(struct kvm_vcpu *target); void kvm_vcpu_on_spin(struct kvm_vcpu *vcpu); void kvm_resched(struct kvm_vcpu *vcpu); void kvm_load_guest_fpu(struct kvm_vcpu *vcpu); -- cgit v1.2.3