Messages in this thread Patch in this message | | | From | Greg Kroah-Hartman <> | Subject | [PATCH 4.1 003/202] kvm: dont try to register to KVM_FAST_MMIO_BUS for non mmio eventfd | Date | Sat, 17 Oct 2015 18:56:26 -0700 |
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4.1-stable review patch. If anyone has any objections, please let me know.
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From: Jason Wang <jasowang@redhat.com>
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>
--- virt/kvm/eventfd.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
--- a/virt/kvm/eventfd.c +++ b/virt/kvm/eventfd.c @@ -846,7 +846,7 @@ kvm_assign_ioeventfd(struct kvm *kvm, st /* 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, 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); }
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