aboutsummaryrefslogtreecommitdiff
path: root/hw/s390x/virtio-ccw.h
diff options
context:
space:
mode:
Diffstat (limited to 'hw/s390x/virtio-ccw.h')
-rw-r--r--hw/s390x/virtio-ccw.h7
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;