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| author | Michael S. Tsirkin <mst@redhat.com> | 2009-06-29 22:24:26 +0300 |
|---|---|---|
| committer | Avi Kivity <avi@redhat.com> | 2009-09-10 08:33:05 +0300 |
| commit | 6c474694530f377507f9aca438c17206e051e6e7 (patch) | |
| tree | 11590f6cca777716e7dfbc16c2d98fc7d64c11b0 /virt | |
| parent | 108b56690f35e083c5559116d6656f59a557a815 (diff) | |
| download | lwn-6c474694530f377507f9aca438c17206e051e6e7.tar.gz lwn-6c474694530f377507f9aca438c17206e051e6e7.zip | |
KVM: convert bus to slots_lock
Use slots_lock to protect device list on the bus. slots_lock is already
taken for read everywhere, so we only need to take it for write when
registering devices. This is in preparation to removing in_range and
kvm->lock around it.
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
Diffstat (limited to 'virt')
| -rw-r--r-- | virt/kvm/coalesced_mmio.c | 2 | ||||
| -rw-r--r-- | virt/kvm/ioapic.c | 2 | ||||
| -rw-r--r-- | virt/kvm/kvm_main.c | 12 |
3 files changed, 13 insertions, 3 deletions
diff --git a/virt/kvm/coalesced_mmio.c b/virt/kvm/coalesced_mmio.c index b40946c1237d..7b7cc9fe5ee3 100644 --- a/virt/kvm/coalesced_mmio.c +++ b/virt/kvm/coalesced_mmio.c @@ -102,7 +102,7 @@ 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->mmio_bus, &dev->dev); + kvm_io_bus_register_dev(kvm, &kvm->mmio_bus, &dev->dev); return 0; } diff --git a/virt/kvm/ioapic.c b/virt/kvm/ioapic.c index 0532fa68f5d1..0eca54e06326 100644 --- a/virt/kvm/ioapic.c +++ b/virt/kvm/ioapic.c @@ -343,7 +343,7 @@ int kvm_ioapic_init(struct kvm *kvm) kvm_ioapic_reset(ioapic); kvm_iodevice_init(&ioapic->dev, &ioapic_mmio_ops); ioapic->kvm = kvm; - kvm_io_bus_register_dev(&kvm->mmio_bus, &ioapic->dev); + kvm_io_bus_register_dev(kvm, &kvm->mmio_bus, &ioapic->dev); return 0; } diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c index bbb4029d7c4d..0edc366ecf89 100644 --- a/virt/kvm/kvm_main.c +++ b/virt/kvm/kvm_main.c @@ -2527,7 +2527,17 @@ struct kvm_io_device *kvm_io_bus_find_dev(struct kvm_io_bus *bus, return NULL; } -void kvm_io_bus_register_dev(struct kvm_io_bus *bus, struct kvm_io_device *dev) +void kvm_io_bus_register_dev(struct kvm *kvm, struct kvm_io_bus *bus, + struct kvm_io_device *dev) +{ + down_write(&kvm->slots_lock); + __kvm_io_bus_register_dev(bus, dev); + up_write(&kvm->slots_lock); +} + +/* An unlocked version. Caller must have write lock on slots_lock. */ +void __kvm_io_bus_register_dev(struct kvm_io_bus *bus, + struct kvm_io_device *dev) { BUG_ON(bus->dev_count > (NR_IOBUS_DEVS-1)); |