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vhost-user-scsi: Introduce vhost-user-scsi host device

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This commit introduces a vhost-user device for SCSI. This is based
on the existing vhost-scsi implementation, but done over vhost-user
instead. It also uses a chardev to connect to the backend. Unlike
vhost-scsi (today), VMs using vhost-user-scsi can be live migrated.

To use it, start Qemu with a command line equivalent to:

qemu-system-x86_64 \
       -chardev socket,id=vus0,path=/tmp/vus.sock \
       -device vhost-user-scsi-pci,chardev=vus0,bus=pci.0,addr=...

A separate commit presents a sample application linked with libiscsi to
provide a backend for vhost-user-scsi.

Signed-off-by: Felipe Franciosi <felipe@nutanix.com>
Message-Id: <1488479153-21203-4-git-send-email-felipe@nutanix.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Felipe Franciosi 2017-03-02 10:25:52 -08:00 • committed by Paolo Bonzini
parent 44cb280d33
commit f12c1ebddf
10 changed files with 315 additions and 1 deletions
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58
hw/virtio/virtio-pci.c
View file

@ -2135,6 +2135,61 @@ static const TypeInfo vhost_scsi_pci_info = {
};
#endif
#ifdef CONFIG_LINUX
/* vhost-user-scsi-pci */
static Property vhost_user_scsi_pci_properties[] = {
DEFINE_PROP_UINT32("vectors", VirtIOPCIProxy, nvectors,
DEV_NVECTORS_UNSPECIFIED),
DEFINE_PROP_END_OF_LIST(),
};
static void vhost_user_scsi_pci_realize(VirtIOPCIProxy *vpci_dev, Error **errp)
{
VHostUserSCSIPCI *dev = VHOST_USER_SCSI_PCI(vpci_dev);
DeviceState *vdev = DEVICE(&dev->vdev);
VirtIOSCSICommon *vs = VIRTIO_SCSI_COMMON(vdev);
if (vpci_dev->nvectors == DEV_NVECTORS_UNSPECIFIED) {
vpci_dev->nvectors = vs->conf.num_queues + 3;
}
qdev_set_parent_bus(vdev, BUS(&vpci_dev->bus));
object_property_set_bool(OBJECT(vdev), true, "realized", errp);
}
static void vhost_user_scsi_pci_class_init(ObjectClass *klass, void *data)
{
DeviceClass *dc = DEVICE_CLASS(klass);
VirtioPCIClass *k = VIRTIO_PCI_CLASS(klass);
PCIDeviceClass *pcidev_k = PCI_DEVICE_CLASS(klass);
k->realize = vhost_user_scsi_pci_realize;
set_bit(DEVICE_CATEGORY_STORAGE, dc->categories);
dc->props = vhost_user_scsi_pci_properties;
pcidev_k->vendor_id = PCI_VENDOR_ID_REDHAT_QUMRANET;
pcidev_k->device_id = PCI_DEVICE_ID_VIRTIO_SCSI;
pcidev_k->revision = 0x00;
pcidev_k->class_id = PCI_CLASS_STORAGE_SCSI;
}
static void vhost_user_scsi_pci_instance_init(Object *obj)
{
VHostUserSCSIPCI *dev = VHOST_USER_SCSI_PCI(obj);
virtio_instance_init_common(obj, &dev->vdev, sizeof(dev->vdev),
TYPE_VHOST_USER_SCSI);
object_property_add_alias(obj, "bootindex", OBJECT(&dev->vdev),
"bootindex", &error_abort);
}
static const TypeInfo vhost_user_scsi_pci_info = {
.name = TYPE_VHOST_USER_SCSI_PCI,
.parent = TYPE_VIRTIO_PCI,
.instance_size = sizeof(VHostUserSCSIPCI),
.instance_init = vhost_user_scsi_pci_instance_init,
.class_init = vhost_user_scsi_pci_class_init,
};
#endif
/* vhost-vsock-pci */
#ifdef CONFIG_VHOST_VSOCK
@ -2612,6 +2667,9 @@ static void virtio_pci_register_types(void)
#ifdef CONFIG_VHOST_SCSI
type_register_static(&vhost_scsi_pci_info);
#endif
#ifdef CONFIG_LINUX
type_register_static(&vhost_user_scsi_pci_info);
#endif
#ifdef CONFIG_VHOST_VSOCK
type_register_static(&vhost_vsock_pci_info);
#endif