KVM: Add PV MSR to enable asynchronous page faults delivery.
Guest enables async PF vcpu functionality using this MSR.
Reviewed-by: Rik van Riel <riel@redhat.com>
Signed-off-by: Gleb Natapov <gleb@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
diff --git a/virt/kvm/async_pf.c b/virt/kvm/async_pf.c
index e97eae9..1f59498 100644
--- a/virt/kvm/async_pf.c
+++ b/virt/kvm/async_pf.c
@@ -190,3 +190,23 @@
kmem_cache_free(async_pf_cache, work);
return 0;
}
+
+int kvm_async_pf_wakeup_all(struct kvm_vcpu *vcpu)
+{
+ struct kvm_async_pf *work;
+
+ if (!list_empty(&vcpu->async_pf.done))
+ return 0;
+
+ work = kmem_cache_zalloc(async_pf_cache, GFP_ATOMIC);
+ if (!work)
+ return -ENOMEM;
+
+ work->page = bad_page;
+ get_page(bad_page);
+ INIT_LIST_HEAD(&work->queue); /* for list_del to work */
+
+ list_add_tail(&work->link, &vcpu->async_pf.done);
+ vcpu->async_pf.queued++;
+ return 0;
+}