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authorChangpeng Liu <changpeng.liu@intel.com>2018-01-04 09:53:32 +0800
committerMichael S. Tsirkin <mst@redhat.com>2018-01-18 21:52:37 +0200
commit00343e4b54ba0685e9ebe928ec5713b0cf7f1d1c (patch)
treed8827b2e2acab5c8803282db4bbee5c3808ca399 /hw/virtio/virtio-pci.h
parent4c3e257b5e6ccba6bd34f780fab8008e0d79680a (diff)
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vhost-user-blk: introduce a new vhost-user-blk host device
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>
Diffstat (limited to 'hw/virtio/virtio-pci.h')
-rw-r--r--hw/virtio/virtio-pci.h18
1 files changed, 18 insertions, 0 deletions
diff --git a/hw/virtio/virtio-pci.h b/hw/virtio/virtio-pci.h
index 12d3a90..813082b 100644
--- a/hw/virtio/virtio-pci.h
+++ b/hw/virtio/virtio-pci.h
@@ -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.
*/