path: root/virt/kvm/coalesced_mmio.c
diff options
authorGregory Haskins <ghaskins@novell.com>2009-07-07 17:08:44 -0400
committerAvi Kivity <avi@redhat.com>2009-09-10 08:33:12 +0300
commit090b7aff27120cdae76a346a70db394844fea598 (patch)
tree4676410f57a44d7c0fba9d791fc77d7850ad1d51 /virt/kvm/coalesced_mmio.c
parentfef07aae9cd9ed82f94228c311b35360f1f38902 (diff)
KVM: make io_bus interface more robust
Today kvm_io_bus_regsiter_dev() returns void and will internally BUG_ON if it fails. We want to create dynamic MMIO/PIO entries driven from userspace later in the series, so we need to enhance the code to be more robust with the following changes: 1) Add a return value to the registration function 2) Fix up all the callsites to check the return code, handle any failures, and percolate the error up to the caller. 3) Add an unregister function that collapses holes in the array Signed-off-by: Gregory Haskins <ghaskins@novell.com> Acked-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Avi Kivity <avi@redhat.com>
Diffstat (limited to 'virt/kvm/coalesced_mmio.c')
1 files changed, 6 insertions, 2 deletions
diff --git a/virt/kvm/coalesced_mmio.c b/virt/kvm/coalesced_mmio.c
index 0352f81ecc0..04d69cd7049 100644
--- a/virt/kvm/coalesced_mmio.c
+++ b/virt/kvm/coalesced_mmio.c
@@ -92,6 +92,7 @@ static const struct kvm_io_device_ops coalesced_mmio_ops = {
int kvm_coalesced_mmio_init(struct kvm *kvm)
struct kvm_coalesced_mmio_dev *dev;
+ int ret;
dev = kzalloc(sizeof(struct kvm_coalesced_mmio_dev), GFP_KERNEL);
if (!dev)
@@ -100,9 +101,12 @@ int kvm_coalesced_mmio_init(struct kvm *kvm)
kvm_iodevice_init(&dev->dev, &coalesced_mmio_ops);
dev->kvm = kvm;
kvm->coalesced_mmio_dev = dev;
- kvm_io_bus_register_dev(kvm, &kvm->mmio_bus, &dev->dev);
- return 0;
+ ret = kvm_io_bus_register_dev(kvm, &kvm->mmio_bus, &dev->dev);
+ if (ret < 0)
+ kfree(dev);
+ return ret;
int kvm_vm_ioctl_register_coalesced_mmio(struct kvm *kvm,