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| author | Cornelia Huck <cornelia.huck@de.ibm.com> | 2013-02-15 10:18:43 +0100 |
|---|---|---|
| committer | Cornelia Huck <cornelia.huck@de.ibm.com> | 2013-06-25 17:11:11 +0200 |
| commit | b4436a0b4db0334c3157f71e9baa2944a133c4d4 (patch) | |
| tree | 2cec150cd86566799faf013f67e432656097eef4 /hw/s390x/virtio-ccw.h | |
| parent | 6504a93011138458a2e4f67b513c5a77bdb3cae1 (diff) | |
| download | qemu-b4436a0b4db0334c3157f71e9baa2944a133c4d4.tar.gz | |
virtio-ccw: Wire up ioeventfd.
On hosts that support ioeventfd, make use of it for host-to-guest
notifications via diagnose 500.
Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
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; |