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authorJason Wang <jasowang@redhat.com>2015-09-15 14:41:54 +0800
committerPaolo Bonzini <pbonzini@redhat.com>2015-09-15 16:58:27 +0200
commit8453fecbecae26edb3f278627376caab05d9a88d (patch)
tree26c18feae38a64a5247132dca8a328c49740b06e /virt
parent81523aac01a7f68af2576800c8623edfb6323017 (diff)
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>
Diffstat (limited to 'virt')
-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);
}