VFIO is a framework that allows a physical device to be securely passed through
to a user space process. Typically, the user space process is a VM and the device
is passed through to it in order to achieve high performance. VFIO provides an API
and the required functionality in the kernel.
vfio-user is a framework that allows implementing PCI devices in userspace.
SPDK NVMf library provides the emulation of a NVMe device, combined with vfio-user
protocol, we can provide the emulated NVMe device to VM or client application, such
as SPDK NVMe perf.
This patch has dependency on libvfio-user library, users can start NVMe identify/perf
examples.
Usage:
1. Start nvmf_target.
2. Use RPC to create a subsystem with namespace bdev.
mkdir -p /var/run/muser
mkdir -p /var/run/muser/iommu_group
mkdir -p /var/run/muser/domain/muser0/8
mkdir -p /dev/shm/muser/muser0
scripts/rpc.py nvmf_create_transport -t VFIOUSER
scripts/rpc.py nvmf_create_subsystem -a nqn.2019-07.io.spdk.muser:/var/run/muser/domain/muser0/8
scripts/rpc.py bdev_malloc_create -b muser0 $((512)) 512
scripts/rpc.py nvmf_subsystem_add_ns -n 1 nqn.2019-07.io.spdk.muser:/var/run/muser/domain/muser0/8 muser0
scripts/rpc.py nvmf_subsystem_add_listener -t VFIOUSER -a "/var/run/muser/domain/muser0/8" -s 0 nqn.2019-07.io.spdk.muser:/var/run/muser/domain/muser0/8
ln -s /var/run/muser/domain/muser0/8 /var/run/muser/domain/muser0/8/iommu_group
ln -s /var/run/muser/domain/muser0/8 /var/run/muser/iommu_group/8
ln -s /var/run/muser/domain/muser0/8/bar0 /dev/shm/muser/muser0/bar0
Currently, file /var/run/muser/domain/muser0/8/ctrlr is the socket file which is used
to transfer socket messages between target and client.
[1] https://www.mail-archive.com/qemu-devel@nongnu.org/msg723794.html
Co-authored-by: Ben Walker <benjamin.walker@intel.com>
Co-authored-by: Changpeng Liu <changpeng.liu@intel.com>
Co-authored-by: Thanos Makatos <thanos.makatos@nutanix.com>
Signed-off-by: Thanos Makatos <thanos.makatos@nutanix.com>
Signed-off-by: Jim Harris <james.r.harris@intel.com>
Signed-off-by: Ben Walker <benjamin.walker@intel.com>
Signed-off-by: Changpeng Liu <changpeng.liu@intel.com>
Change-Id: I5f2a8e77314a6a13aa6366dd4a6dc77b13434e7b
Reviewed-on: https://review.spdk.io/gerrit/c/spdk/spdk/+/3838
Community-CI: Broadcom CI
Reviewed-by: Shuhei Matsumoto <shuhei.matsumoto.xt@hitachi.com>
Tested-by: SPDK CI Jenkins <sys_sgci@intel.com>
f4fd07c68c