From 108a64818e69be0a97cde3838d768f2d9910c08b Mon Sep 17 00:00:00 2001 From: Cindy Lu Date: Wed, 1 Jul 2020 22:55:37 +0800 Subject: vhost-vdpa: introduce vhost-vdpa backend 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 Signed-off-by: Tiwei Bie Signed-off-by: Cindy Lu Signed-off-by: Jason Wang Message-Id: <20200701145538.22333-14-lulu@redhat.com> Reviewed-by: Michael S. Tsirkin Signed-off-by: Michael S. Tsirkin Acked-by: Jason Wang --- docs/interop/index.rst | 1 + docs/interop/vhost-vdpa.rst | 17 +++++++++++++++++ 2 files changed, 18 insertions(+) create mode 100644 docs/interop/vhost-vdpa.rst (limited to 'docs') diff --git a/docs/interop/index.rst b/docs/interop/index.rst index 049387a..006f986 100644 --- a/docs/interop/index.rst +++ b/docs/interop/index.rst @@ -20,3 +20,4 @@ Contents: qemu-ga vhost-user vhost-user-gpu + vhost-vdpa diff --git a/docs/interop/vhost-vdpa.rst b/docs/interop/vhost-vdpa.rst new file mode 100644 index 0000000..0c70ba0 --- /dev/null +++ b/docs/interop/vhost-vdpa.rst @@ -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 -- cgit v1.1