@@ -30,6 +30,8 @@ struct virtio_blk_inhdr
unsigned char status;
};
+#define VIRTIO_BLK_AUTO_NUM_QUEUES UINT16_MAX
+
struct VirtIOBlkConf
{
BlockConf conf;
@@ -1147,6 +1147,9 @@ 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 == VIRTIO_BLK_AUTO_NUM_QUEUES) {
+ conf->num_queues = 1;
+ }
if (!conf->num_queues) {
error_setg(errp, "num-queues property must be larger than 0");
return;
@@ -1281,7 +1284,8 @@ 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_UINT16("num-queues", VirtIOBlock, conf.num_queues,
+ VIRTIO_BLK_AUTO_NUM_QUEUES),
DEFINE_PROP_UINT16("queue-size", VirtIOBlock, conf.queue_size, 256),
DEFINE_PROP_BOOL("seg-max-adjust", VirtIOBlock, conf.seg_max_adjust, true),
DEFINE_PROP_LINK("iothread", VirtIOBlock, conf.iothread, TYPE_IOTHREAD,
@@ -32,6 +32,7 @@ GlobalProperty hw_compat_5_0[] = {
{ "vhost-scsi", "num_queues", "1"},
{ "vhost-user-scsi", "num_queues", "1"},
{ "virtio-balloon-device", "page-poison", "false" },
+ { "virtio-blk-device", "num-queues", "1"},
{ "virtio-scsi-device", "num_queues", "1"},
{ "vmport", "x-read-set-eax", "off" },
{ "vmport", "x-signal-unsupported-cmd", "off" },
@@ -50,9 +50,14 @@ static void virtio_blk_pci_realize(VirtIOPCIProxy *vpci_dev, Error **errp)
{
VirtIOBlkPCI *dev = VIRTIO_BLK_PCI(vpci_dev);
DeviceState *vdev = DEVICE(&dev->vdev);
+ VirtIOBlkConf *conf = &dev->vdev.conf;
+
+ if (conf->num_queues == VIRTIO_BLK_AUTO_NUM_QUEUES) {
+ conf->num_queues = virtio_pci_optimal_num_queues(0);
+ }
if (vpci_dev->nvectors == DEV_NVECTORS_UNSPECIFIED) {
- vpci_dev->nvectors = dev->vdev.conf.num_queues + 1;
+ vpci_dev->nvectors = conf->num_queues + 1;
}
qdev_realize(vdev, BUS(&vpci_dev->bus), errp);