kvm: don't try to register to KVM_FAST_MMIO_BUS for non mmio eventfd (8453fecb) · Commits · 戴 / test

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>

virt/kvm/eventfd.c

+2 −2

Original line number	Diff line number	Diff line
		@@ -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);
		}

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