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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
parent108b56690f35e083c5559116d6656f59a557a815 (diff)
downloadlinux-linaro-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>
-rw-r--r--arch/x86/kvm/i8254.c5
-rw-r--r--arch/x86/kvm/i8259.c2
-rw-r--r--include/linux/kvm_host.h5
-rw-r--r--virt/kvm/coalesced_mmio.c2
-rw-r--r--virt/kvm/ioapic.c2
-rw-r--r--virt/kvm/kvm_main.c12
6 files changed, 21 insertions, 7 deletions
diff --git a/arch/x86/kvm/i8254.c b/arch/x86/kvm/i8254.c
index bcd00c76d69..4082cdd468e 100644
--- a/arch/x86/kvm/i8254.c
+++ b/arch/x86/kvm/i8254.c
@@ -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;
diff --git a/arch/x86/kvm/i8259.c b/arch/x86/kvm/i8259.c
index 148c52a608d..1851aec8a7d 100644
--- a/arch/x86/kvm/i8259.c
+++ b/arch/x86/kvm/i8259.c
@@ -548,6 +548,6 @@ struct kvm_pic *kvm_create_pic(struct kvm *kvm)
* Initialize PIO device
*/
kvm_iodevice_init(&s->dev, &picdev_ops);
- kvm_io_bus_register_dev(&kvm->pio_bus, &s->dev);
+ kvm_io_bus_register_dev(kvm, &kvm->pio_bus, &s->dev);
return s;
}
diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
index 4ea42c95053..96c8c0b0192 100644
--- a/include/linux/kvm_host.h
+++ b/include/linux/kvm_host.h
@@ -42,6 +42,7 @@
#define KVM_USERSPACE_IRQ_SOURCE_ID 0
+struct kvm;
struct kvm_vcpu;
extern struct kmem_cache *kvm_vcpu_cache;
@@ -61,7 +62,9 @@ void kvm_io_bus_init(struct kvm_io_bus *bus);
void kvm_io_bus_destroy(struct kvm_io_bus *bus);
struct kvm_io_device *kvm_io_bus_find_dev(struct kvm_io_bus *bus,
gpa_t addr, int len, int is_write);
-void kvm_io_bus_register_dev(struct kvm_io_bus *bus,
+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);
struct kvm_vcpu {
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));