Commit 49cc0340 authored by Felipe Franciosi's avatar Felipe Franciosi Committed by Paolo Bonzini

vhost-user-scsi: Introduce a vhost-user-scsi sample application

This commit introduces a vhost-user-scsi backend sample application. It
must be linked with libiscsi and libvhost-user.

To use it, compile with:
  $ make vhost-user-scsi

And run as follows:
  $ ./vhost-user-scsi -u vus.sock -i iscsi://uri_to_target/
  $ qemu-system-x86_64 --enable-kvm -m 512 \
      -object memory-backend-file,id=mem,size=512m,share=on,mem-path=guestmem \
      -numa node,memdev=mem \
      -chardev socket,id=vhost-user-scsi,path=vus.sock \
      -device vhost-user-scsi-pci,chardev=vhost-user-scsi \

The application is currently limited at one LUN only and it processes
requests synchronously (therefore only achieving QD1). The purpose of
the code is to show how a backend can be implemented and to test the
vhost-user-scsi Qemu implementation.

If a different instance of this vhost-user-scsi application is executed
at a remote host, a VM can be live migrated to such a host.
Signed-off-by: 's avatarFelipe Franciosi <felipe@nutanix.com>
Message-Id: <1488479153-21203-5-git-send-email-felipe@nutanix.com>
parent f12c1ebd
......@@ -269,6 +269,7 @@ dummy := $(call unnest-vars,, \
ivshmem-client-obj-y \
ivshmem-server-obj-y \
libvhost-user-obj-y \
vhost-user-scsi-obj-y \
qga-vss-dll-obj-y \
block-obj-y \
block-obj-m \
......@@ -473,6 +474,8 @@ ivshmem-client$(EXESUF): $(ivshmem-client-obj-y) $(COMMON_LDADDS)
$(call LINK, $^)
ivshmem-server$(EXESUF): $(ivshmem-server-obj-y) $(COMMON_LDADDS)
$(call LINK, $^)
vhost-user-scsi$(EXESUF): $(vhost-user-scsi-obj-y)
$(call LINK, $^)
module_block.h: $(SRC_PATH)/scripts/modules/module_block.py config-host.mak
$(call quiet-command,$(PYTHON) $< $@ \
......
......@@ -110,6 +110,10 @@ qga-vss-dll-obj-y = qga/
ivshmem-client-obj-y = contrib/ivshmem-client/
ivshmem-server-obj-y = contrib/ivshmem-server/
libvhost-user-obj-y = contrib/libvhost-user/
vhost-user-scsi.o-cflags := $(LIBISCSI_CFLAGS)
vhost-user-scsi.o-libs := $(LIBISCSI_LIBS)
vhost-user-scsi-obj-y = contrib/vhost-user-scsi/
vhost-user-scsi-obj-y += contrib/libvhost-user/libvhost-user.o
######################################################################
trace-events-subdirs =
......
......@@ -17,6 +17,7 @@
#include <stdint.h>
#include <stdbool.h>
#include <stddef.h>
#include <sys/poll.h>
#include <linux/vhost.h>
#include "standard-headers/linux/virtio_ring.h"
......@@ -192,11 +193,11 @@ typedef struct VuVirtq {
} VuVirtq;
enum VuWatchCondtion {
VU_WATCH_IN = 1 << 0,
VU_WATCH_OUT = 1 << 1,
VU_WATCH_PRI = 1 << 2,
VU_WATCH_ERR = 1 << 3,
VU_WATCH_HUP = 1 << 4,
VU_WATCH_IN = POLLIN,
VU_WATCH_OUT = POLLOUT,
VU_WATCH_PRI = POLLPRI,
VU_WATCH_ERR = POLLERR,
VU_WATCH_HUP = POLLHUP,
};
typedef void (*vu_panic_cb) (VuDev *dev, const char *err);
......
vhost-user-scsi-obj-y = vhost-user-scsi.o
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