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virtio: access ISR atomically

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This will be needed once dataplane will be able to set it outside
the big QEMU lock.

Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Tested-by: Farhan Ali <alifm@linux.vnet.ibm.com>
Tested-by: Alex Williamson <alex.williamson@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Paolo Bonzini 2016-11-18 16:07:01 +01:00 • committed by Michael S. Tsirkin
parent 310837de6c
commit 0687c37c5e
3 changed files with 23 additions and 14 deletions
Download patch file Download diff file Expand all files Collapse all files

6
hw/virtio/virtio-mmio.c
View file

@ -191,7 +191,7 @@ static uint64_t virtio_mmio_read(void *opaque, hwaddr offset, unsigned size)
return virtio_queue_get_addr(vdev, vdev->queue_sel)
>> proxy->guest_page_shift;
case VIRTIO_MMIO_INTERRUPTSTATUS:
return vdev->isr;
return atomic_read(&vdev->isr);
case VIRTIO_MMIO_STATUS:
return vdev->status;
case VIRTIO_MMIO_HOSTFEATURESSEL:
@ -299,7 +299,7 @@ static void virtio_mmio_write(void *opaque, hwaddr offset, uint64_t value,
}
break;
case VIRTIO_MMIO_INTERRUPTACK:
vdev->isr &= ~value;
atomic_and(&vdev->isr, ~value);
virtio_update_irq(vdev);
break;
case VIRTIO_MMIO_STATUS:
@ -347,7 +347,7 @@ static void virtio_mmio_update_irq(DeviceState *opaque, uint16_t vector)
if (!vdev) {
return;
}
level = (vdev->isr != 0);
level = (atomic_read(&vdev->isr) != 0);
DPRINTF("virtio_mmio setting IRQ %d\n", level);
qemu_set_irq(proxy->irq, level);
}