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authorMichael S. Tsirkin <mst@redhat.com>2009-06-29 22:24:26 +0300
committerAvi Kivity <avi@redhat.com>2009-09-10 08:33:05 +0300
commit6c474694530f377507f9aca438c17206e051e6e7 (patch)
tree11590f6cca777716e7dfbc16c2d98fc7d64c11b0 /virt
parent108b56690f35e083c5559116d6656f59a557a815 (diff)
downloadlinux-2.6.34-ux500-6c474694530f377507f9aca438c17206e051e6e7.tar.gz
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.c2
-rw-r--r--virt/kvm/ioapic.c2
-rw-r--r--virt/kvm/kvm_main.c12
3 files changed, 13 insertions, 3 deletions
diff --git a/virt/kvm/coalesced_mmio.c b/virt/kvm/coalesced_mmio.c
index b40946c1237..7b7cc9fe5ee 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 0532fa68f5d..0eca54e0632 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 bbb4029d7c4..0edc366ecf8 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));