diff options
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/s390/kvm/kvm_virtio.c | 22 |
1 files changed, 19 insertions, 3 deletions
diff --git a/drivers/s390/kvm/kvm_virtio.c b/drivers/s390/kvm/kvm_virtio.c index 4e8354aa8576..28c90b89f2b4 100644 --- a/drivers/s390/kvm/kvm_virtio.c +++ b/drivers/s390/kvm/kvm_virtio.c @@ -299,13 +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); } /* |