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vhost-user-blk: introduce a new vhost-user-blk host device

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This commit introduces a new vhost-user device for block, it uses a
chardev to connect with the backend, same with Qemu virito-blk device,
Guest OS still uses the virtio-blk frontend driver.

To use it, start QEMU with command line like this:

qemu-system-x86_64 \
    -chardev socket,id=char0,path=/path/vhost.socket \
    -device vhost-user-blk-pci,chardev=char0,num-queues=2, \
            bootindex=2... \

Users can use different parameters for `num-queues` and `bootindex`.

Different with exist Qemu virtio-blk host device, it makes more easy
for users to implement their own I/O processing logic, such as all
user space I/O stack against hardware block device. It uses the new
vhost messages(VHOST_USER_GET_CONFIG) to get block virtio config
information from backend process.

Signed-off-by: Changpeng Liu <changpeng.liu@intel.com>
Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Changpeng Liu 2018-01-04 09:53:32 +08:00 • committed by Michael S. Tsirkin
parent 4c3e257b5e
commit 00343e4b54
7 changed files with 478 additions and 0 deletions
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18
hw/virtio/virtio-pci.h
View file

@ -27,6 +27,9 @@
#include "hw/virtio/virtio-gpu.h"
#include "hw/virtio/virtio-crypto.h"
#include "hw/virtio/vhost-user-scsi.h"
#if defined(CONFIG_VHOST_USER) && defined(CONFIG_LINUX)
#include "hw/virtio/vhost-user-blk.h"
#endif
#ifdef CONFIG_VIRTFS
#include "hw/9pfs/virtio-9p.h"
@ -46,6 +49,7 @@ typedef struct VirtIOSerialPCI VirtIOSerialPCI;
typedef struct VirtIONetPCI VirtIONetPCI;
typedef struct VHostSCSIPCI VHostSCSIPCI;
typedef struct VHostUserSCSIPCI VHostUserSCSIPCI;
typedef struct VHostUserBlkPCI VHostUserBlkPCI;
typedef struct VirtIORngPCI VirtIORngPCI;
typedef struct VirtIOInputPCI VirtIOInputPCI;
typedef struct VirtIOInputHIDPCI VirtIOInputHIDPCI;
@ -244,6 +248,20 @@ struct VHostUserSCSIPCI {
VHostUserSCSI vdev;
};
#if defined(CONFIG_VHOST_USER) && defined(CONFIG_LINUX)
/*
* vhost-user-blk-pci: This extends VirtioPCIProxy.
*/
#define TYPE_VHOST_USER_BLK_PCI "vhost-user-blk-pci"
#define VHOST_USER_BLK_PCI(obj) \
OBJECT_CHECK(VHostUserBlkPCI, (obj), TYPE_VHOST_USER_BLK_PCI)
struct VHostUserBlkPCI {
VirtIOPCIProxy parent_obj;
VHostUserBlk vdev;
};
#endif
/*
* virtio-blk-pci: This extends VirtioPCIProxy.
*/