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authorJason Wang <jasowang@redhat.com>2015-09-15 14:41:54 +0800
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2015-10-22 14:43:10 -0700
commit87f3ae1f34a06fb5296a4b0d763737171c3f2d65 (patch)
tree6e9d979291e62dd5e004568bc177e208f1bf301b
parent35f5af9cb6994ee92e27b2cd5936142337983284 (diff)
downloadlinux-linaro-stable-87f3ae1f34a06fb5296a4b0d763737171c3f2d65.tar.gz
kvm: don't try to register to KVM_FAST_MMIO_BUS for non mmio eventfd
commit 8453fecbecae26edb3f278627376caab05d9a88d upstream. 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: 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> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
-rw-r--r--virt/kvm/eventfd.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/virt/kvm/eventfd.c b/virt/kvm/eventfd.c
index 9ff4193dfa49..e404806e3a7a 100644
--- a/virt/kvm/eventfd.c
+++ b/virt/kvm/eventfd.c
@@ -846,7 +846,7 @@ kvm_assign_ioeventfd(struct kvm *kvm, struct kvm_ioeventfd *args)
/* 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 @@ kvm_deassign_ioeventfd(struct kvm *kvm, struct kvm_ioeventfd *args)
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);
}