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path: root/drivers/s390/kvm/kvm_virtio.c
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Diffstat (limited to 'drivers/s390/kvm/kvm_virtio.c')
-rw-r--r--drivers/s390/kvm/kvm_virtio.c34
1 files changed, 27 insertions, 7 deletions
diff --git a/drivers/s390/kvm/kvm_virtio.c b/drivers/s390/kvm/kvm_virtio.c
index 3d44244..28c90b8 100644
--- a/drivers/s390/kvm/kvm_virtio.c
+++ b/drivers/s390/kvm/kvm_virtio.c
@@ -188,11 +188,13 @@ static struct virtqueue *kvm_find_vq(struct virtio_device *vdev,
config = kvm_vq_config(kdev->desc)+index;
err = vmem_add_mapping(config->address,
- vring_size(config->num, PAGE_SIZE));
+ vring_size(config->num,
+ KVM_S390_VIRTIO_RING_ALIGN));
if (err)
goto out;
- vq = vring_new_virtqueue(config->num, vdev, (void *) config->address,
+ vq = vring_new_virtqueue(config->num, KVM_S390_VIRTIO_RING_ALIGN,
+ vdev, (void *) config->address,
kvm_notify, callback);
if (!vq) {
err = -ENOMEM;
@@ -209,7 +211,8 @@ static struct virtqueue *kvm_find_vq(struct virtio_device *vdev,
return vq;
unmap:
vmem_remove_mapping(config->address,
- vring_size(config->num, PAGE_SIZE));
+ vring_size(config->num,
+ KVM_S390_VIRTIO_RING_ALIGN));
out:
return ERR_PTR(err);
}
@@ -220,7 +223,8 @@ static void kvm_del_vq(struct virtqueue *vq)
vring_del_virtqueue(vq);
vmem_remove_mapping(config->address,
- vring_size(config->num, PAGE_SIZE));
+ vring_size(config->num,
+ KVM_S390_VIRTIO_RING_ALIGN));
}
/*
@@ -295,13 +299,29 @@ static void scan_devices(void)
*/
static void kvm_extint_handler(u16 code)
{
- void *data = (void *) *(long *) __LC_PFAULT_INTPARM;
- u16 subcode = S390_lowcore.cpu_addr;
+ struct virtqueue *vq;
+ u16 subcode;
+ int config_changed;
+ subcode = S390_lowcore.cpu_addr;
if ((subcode & 0xff00) != VIRTIO_SUBCODE_64)
return;
- vring_interrupt(0, data);
+ /* The LSB might be overloaded, we have to mask it */
+ vq = (struct virtqueue *) ((*(long *) __LC_PFAULT_INTPARM) & ~1UL);
+
+ /* We use the LSB of extparam, to decide, if this interrupt is a config
+ * change or a "standard" interrupt */
+ config_changed = (*(int *) __LC_EXT_PARAMS & 1);
+
+ if (config_changed) {
+ struct virtio_driver *drv;
+ drv = container_of(vq->vdev->dev.driver,
+ struct virtio_driver, driver);
+ if (drv->config_changed)
+ drv->config_changed(vq->vdev);
+ } else
+ vring_interrupt(0, vq);
}
/*
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