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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>
This commit is contained in:
Jason Wang 2015-09-15 14:41:54 +08:00 committed by Paolo Bonzini
parent 81523aac01
commit 8453fecbec
1 changed files with 2 additions and 2 deletions
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4
virt/kvm/eventfd.c
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@ -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 /* When length is ignored, MMIO is also put on a separate bus, for
* faster lookups. * 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, ret = kvm_io_bus_register_dev(kvm, KVM_FAST_MMIO_BUS,
p->addr, 0, &p->dev); p->addr, 0, &p->dev);
if (ret < 0) if (ret < 0)
@ -901,7 +901,7 @@ kvm_deassign_ioeventfd(struct kvm *kvm, struct kvm_ioeventfd *args)
continue; continue;
kvm_io_bus_unregister_dev(kvm, bus_idx, &p->dev); 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, kvm_io_bus_unregister_dev(kvm, KVM_FAST_MMIO_BUS,
&p->dev); &p->dev);
} }