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KVM: convert bus to slots_lock

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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>
This commit is contained in:
Michael S. Tsirkin
2009-06-29 22:24:26 +03:00
committed by Avi Kivity
parent 108b56690f
commit 6c47469453
6 changed files with 21 additions and 7 deletions
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5
arch/x86/kvm/i8254.c
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@ -583,6 +583,7 @@ static const struct kvm_io_device_ops speaker_dev_ops = {
.in_range = speaker_in_range,
};
/* Caller must have writers lock on slots_lock */
struct kvm_pit *kvm_create_pit(struct kvm *kvm, u32 flags)
{
struct kvm_pit *pit;
@ -621,11 +622,11 @@ struct kvm_pit *kvm_create_pit(struct kvm *kvm, u32 flags)
kvm_register_irq_mask_notifier(kvm, 0, &pit->mask_notifier);
kvm_iodevice_init(&pit->dev, &pit_dev_ops);
kvm_io_bus_register_dev(&kvm->pio_bus, &pit->dev);
__kvm_io_bus_register_dev(&kvm->pio_bus, &pit->dev);
if (flags & KVM_PIT_SPEAKER_DUMMY) {
kvm_iodevice_init(&pit->speaker_dev, &speaker_dev_ops);
kvm_io_bus_register_dev(&kvm->pio_bus, &pit->speaker_dev);
__kvm_io_bus_register_dev(&kvm->pio_bus, &pit->speaker_dev);
}
return pit;