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virtio-blk: add num-queues device property 

Multiqueue virtio-blk can be enabled as follows:

  qemu -device virtio-blk-pci,num-queues=8

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Fam Zheng <famz@redhat.com>
Message-id: 1466511196-12612-8-git-send-email-stefanha@redhat.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
master
Stefan Hajnoczi 2016-06-21 13:13:16 +01:00
parent 51b04ac5c6
commit 2f2705908f
2 changed files with 13 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

15
hw/block/virtio-blk.c
View File

@ -710,6 +710,7 @@ static void virtio_blk_update_config(VirtIODevice *vdev, uint8_t *config)
blkcfg.physical_block_exp = get_physical_block_exp(conf);
blkcfg.alignment_offset = 0;
blkcfg.wce = blk_enable_write_cache(s->blk);
virtio_stw_p(vdev, &blkcfg.num_queues, s->conf.num_queues);
memcpy(config, &blkcfg, sizeof(struct virtio_blk_config));
}
@ -753,6 +754,9 @@ static uint64_t virtio_blk_get_features(VirtIODevice *vdev, uint64_t features,
if (blk_is_read_only(s->blk)) {
virtio_add_feature(&features, VIRTIO_BLK_F_RO);
}
if (s->conf.num_queues > 1) {
virtio_add_feature(&features, VIRTIO_BLK_F_MQ);
}
return features;
}
@ -877,6 +881,7 @@ static void virtio_blk_device_realize(DeviceState *dev, Error **errp)
VirtIOBlkConf *conf = &s->conf;
Error *err = NULL;
static int virtio_blk_id;
unsigned i;
if (!conf->conf.blk) {
error_setg(errp, "drive property not set");
@ -886,6 +891,10 @@ static void virtio_blk_device_realize(DeviceState *dev, Error **errp)
error_setg(errp, "Device needs media, but drive is empty");
return;
}
if (!conf->num_queues) {
error_setg(errp, "num-queues property must be larger than 0");
return;
}
blkconf_serial(&conf->conf, &conf->serial);
s->original_wce = blk_enable_write_cache(conf->conf.blk);
@ -903,8 +912,9 @@ static void virtio_blk_device_realize(DeviceState *dev, Error **errp)
s->rq = NULL;
s->sector_mask = (s->conf.conf.logical_block_size / BDRV_SECTOR_SIZE) - 1;
conf->num_queues = 1;
s->vq = virtio_add_queue(vdev, 128, virtio_blk_handle_output);
for (i = 0; i < conf->num_queues; i++) {
virtio_add_queue(vdev, 128, virtio_blk_handle_output);
}
virtio_blk_data_plane_create(vdev, conf, &s->dataplane, &err);
if (err != NULL) {
error_propagate(errp, err);
@ -957,6 +967,7 @@ static Property virtio_blk_properties[] = {
#endif
DEFINE_PROP_BIT("request-merging", VirtIOBlock, conf.request_merging, 0,
true),
DEFINE_PROP_UINT16("num-queues", VirtIOBlock, conf.num_queues, 1),
DEFINE_PROP_END_OF_LIST(),
};

1
include/hw/virtio/virtio-blk.h
View File

@ -47,7 +47,6 @@ struct VirtIOBlockReq;
typedef struct VirtIOBlock {
VirtIODevice parent_obj;
BlockBackend *blk;
VirtQueue *vq;
void *rq;
QEMUBH *bh;
VirtIOBlkConf conf;