diff options
Diffstat (limited to 'hw/s390x/virtio-ccw.h')
| -rw-r--r-- | hw/s390x/virtio-ccw.h | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/hw/s390x/virtio-ccw.h b/hw/s390x/virtio-ccw.h index 121a5f8c4a..433f27af4b 100644 --- a/hw/s390x/virtio-ccw.h +++ b/hw/s390x/virtio-ccw.h @@ -69,6 +69,11 @@ typedef struct VirtIOCCWDeviceClass { /* Change here if we want to support more feature bits. */ #define VIRTIO_CCW_FEATURE_SIZE 1 +/* Performance improves when virtqueue kick processing is decoupled from the + * vcpu thread using ioeventfd for some devices. */ +#define VIRTIO_CCW_FLAG_USE_IOEVENTFD_BIT 1 +#define VIRTIO_CCW_FLAG_USE_IOEVENTFD (1 << VIRTIO_CCW_FLAG_USE_IOEVENTFD_BIT) + struct VirtioCcwDevice { DeviceState parent_obj; SubchDev *sch; @@ -76,6 +81,8 @@ struct VirtioCcwDevice { char *bus_id; uint32_t host_features[VIRTIO_CCW_FEATURE_SIZE]; VirtioBusState bus; + bool ioeventfd_started; + uint32_t flags; /* Guest provided values: */ hwaddr indicators; hwaddr indicators2; |