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vhost-vdpa: introduce vhost-vdpa backend

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Currently we have 2 types of vhost backends in QEMU: vhost kernel and
vhost-user. The above patch provides a generic device for vDPA purpose,
this vDPA device exposes to user space a non-vendor-specific configuration
interface for setting up a vhost HW accelerator, this patch set introduces
a third vhost backend called vhost-vdpa based on the vDPA interface.

Vhost-vdpa usage:

qemu-system-x86_64 -cpu host -enable-kvm \
    ......
    -netdev type=vhost-vdpa,vhostdev=/dev/vhost-vdpa-id,id=vhost-vdpa0 \
    -device virtio-net-pci,netdev=vhost-vdpa0,page-per-vq=on \

Signed-off-by: Lingshan zhu <lingshan.zhu@intel.com>
Signed-off-by: Tiwei Bie <tiwei.bie@intel.com>
Signed-off-by: Cindy Lu <lulu@redhat.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
Message-Id: <20200701145538.22333-14-lulu@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Acked-by: Jason Wang <jasowang@redhat.com>
This commit is contained in:
Cindy Lu 2020-07-01 22:55:37 +08:00 • committed by Michael S. Tsirkin
parent 38140cc4d9
commit 108a64818e
12 changed files with 600 additions and 7 deletions
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1
docs/interop/index.rst
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@ -20,3 +20,4 @@ Contents:
qemu-ga
vhost-user
vhost-user-gpu
vhost-vdpa

17
docs/interop/vhost-vdpa.rst Normal file
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@ -0,0 +1,17 @@
=====================
Vhost-vdpa Protocol
=====================
Introduction
=============
vDPA(Virtual data path acceleration) device is a device that uses
a datapath which complies with the virtio specifications with vendor
specific control path. vDPA devices can be both physically located on
the hardware or emulated by software.
This document describes the vDPA support in qemu
Here is the kernel commit here
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=4c8cf31885f69e86be0b5b9e6677a26797365e1d
TODO : More information will add later