kvm: don't try to register to KVM_FAST_MMIO_BUS for non mmio eventfd
We only want zero length mmio eventfd to be registered on
KVM_FAST_MMIO_BUS. So check this explicitly when arg->len is zero to
make sure this.
Cc: stable@vger.kernel.org
Cc: Gleb Natapov <gleb@kernel.org>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
Reviewed-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
diff --git a/virt/kvm/eventfd.c b/virt/kvm/eventfd.c
index 9ff4193..e404806 100644
--- a/virt/kvm/eventfd.c
+++ b/virt/kvm/eventfd.c
@@ -846,7 +846,7 @@
/* When length is ignored, MMIO is also put on a separate bus, for
* faster lookups.
*/
- if (!args->len && !(args->flags & KVM_IOEVENTFD_FLAG_PIO)) {
+ if (!args->len && bus_idx == KVM_MMIO_BUS) {
ret = kvm_io_bus_register_dev(kvm, KVM_FAST_MMIO_BUS,
p->addr, 0, &p->dev);
if (ret < 0)
@@ -901,7 +901,7 @@
continue;
kvm_io_bus_unregister_dev(kvm, bus_idx, &p->dev);
- if (!p->length) {
+ if (!p->length && p->bus_idx == KVM_MMIO_BUS) {
kvm_io_bus_unregister_dev(kvm, KVM_FAST_MMIO_BUS,
&p->dev);
}
