From: Cindy Lu <l...@redhat.com>
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....@intel.com>
Signed-off-by: Tiwei Bie <tiwei....@intel.com>
Signed-off-by: Cindy Lu <l...@redhat.com>
Signed-off-by: Jason Wang <jasow...@redhat.com>
Message-Id: <20200701145538.22333-14-l...@redhat.com>
Reviewed-by: Michael S. Tsirkin <m...@redhat.com>
Signed-off-by: Michael S. Tsirkin <m...@redhat.com>
Acked-by: Jason Wang <jasow...@redhat.com>
---
configure | 21 ++
include/hw/virtio/vhost-backend.h | 4 +-
include/hw/virtio/vhost-vdpa.h | 26 ++
include/hw/virtio/vhost.h | 7 +
hw/net/vhost_net.c | 18 +-
hw/net/virtio-net.c | 19 ++
hw/virtio/vhost-backend.c | 6 +
hw/virtio/vhost-vdpa.c | 475 ++++++++++++++++++++++++++++++
docs/interop/index.rst | 1 +
docs/interop/vhost-vdpa.rst | 17 ++
hw/virtio/Makefile.objs | 1 +
qemu-options.hx | 12 +
12 files changed, 600 insertions(+), 7 deletions(-)
create mode 100644 include/hw/virtio/vhost-vdpa.h
create mode 100644 hw/virtio/vhost-vdpa.c
create mode 100644 docs/interop/vhost-vdpa.rst
diff --git a/configure b/configure
index 4a22dcd563..3db7f20185 100755
--- a/configure
+++ b/configure
@@ -1575,6 +1575,10 @@ for opt do
;;
--enable-vhost-user) vhost_user="yes"
;;
+ --disable-vhost-vdpa) vhost_vdpa="no"
+ ;;
+ --enable-vhost-vdpa) vhost_vdpa="yes"
+ ;;
--disable-vhost-kernel) vhost_kernel="no"
;;
--enable-vhost-kernel) vhost_kernel="yes"
@@ -1883,6 +1887,7 @@ disabled with --disable-FEATURE, default is enabled if
available:
vhost-crypto vhost-user-crypto backend support
vhost-kernel vhost kernel backend support
vhost-user vhost-user backend support
+ vhost-vdpa vhost-vdpa kernel backend support
spice spice
rbd rados block device (rbd)
libiscsi iscsi support
@@ -2394,6 +2399,10 @@ test "$vhost_user" = "" && vhost_user=yes
if test "$vhost_user" = "yes" && test "$mingw32" = "yes"; then
error_exit "vhost-user isn't available on win32"
fi
+test "$vhost_vdpa" = "" && vhost_vdpa=$linux
+if test "$vhost_vdpa" = "yes" && test "$linux" != "yes"; then
+ error_exit "vhost-vdpa is only available on Linux"
+fi
test "$vhost_kernel" = "" && vhost_kernel=$linux
if test "$vhost_kernel" = "yes" && test "$linux" != "yes"; then
error_exit "vhost-kernel is only available on Linux"
@@ -2422,6 +2431,11 @@ test "$vhost_user_fs" = "" && vhost_user_fs=$vhost_user
if test "$vhost_user_fs" = "yes" && test "$vhost_user" = "no"; then
error_exit "--enable-vhost-user-fs requires --enable-vhost-user"
fi
+#vhost-vdpa backends
+test "$vhost_net_vdpa" = "" && vhost_net_vdpa=$vhost_vdpa
+if test "$vhost_net_vdpa" = "yes" && test "$vhost_vdpa" = "no"; then
+ error_exit "--enable-vhost-net-vdpa requires --enable-vhost-vdpa"
+fi
# OR the vhost-kernel and vhost-user values for simplicity
if test "$vhost_net" = ""; then
@@ -6936,6 +6950,7 @@ echo "vhost-scsi support $vhost_scsi"
echo "vhost-vsock support $vhost_vsock"
echo "vhost-user support $vhost_user"
echo "vhost-user-fs support $vhost_user_fs"
+echo "vhost-vdpa support $vhost_vdpa"
echo "Trace backends $trace_backends"
if have_backend "simple"; then
echo "Trace output file $trace_file-<pid>"
@@ -7437,6 +7452,9 @@ fi
if test "$vhost_net_user" = "yes" ; then
echo "CONFIG_VHOST_NET_USER=y" >> $config_host_mak
fi
+if test "$vhost_net_vdpa" = "yes" ; then
+ echo "CONFIG_VHOST_NET_VDPA=y" >> $config_host_mak
+fi
if test "$vhost_crypto" = "yes" ; then
echo "CONFIG_VHOST_CRYPTO=y" >> $config_host_mak
fi
@@ -7452,6 +7470,9 @@ fi
if test "$vhost_user" = "yes" ; then
echo "CONFIG_VHOST_USER=y" >> $config_host_mak
fi
+if test "$vhost_vdpa" = "yes" ; then
+ echo "CONFIG_VHOST_VDPA=y" >> $config_host_mak
+fi
if test "$vhost_user_fs" = "yes" ; then
echo "CONFIG_VHOST_USER_FS=y" >> $config_host_mak
fi
diff --git a/include/hw/virtio/vhost-backend.h
b/include/hw/virtio/vhost-backend.h
index e7cb8d028c..8825bd278f 100644
--- a/include/hw/virtio/vhost-backend.h
+++ b/include/hw/virtio/vhost-backend.h
@@ -17,7 +17,8 @@ typedef enum VhostBackendType {
VHOST_BACKEND_TYPE_NONE = 0,
VHOST_BACKEND_TYPE_KERNEL = 1,
VHOST_BACKEND_TYPE_USER = 2,
- VHOST_BACKEND_TYPE_MAX = 3,
+ VHOST_BACKEND_TYPE_VDPA = 3,
+ VHOST_BACKEND_TYPE_MAX = 4,
} VhostBackendType;
typedef enum VhostSetConfigType {
@@ -170,6 +171,7 @@ typedef struct VhostOps {
} VhostOps;
extern const VhostOps user_ops;
+extern const VhostOps vdpa_ops;
int vhost_set_backend_type(struct vhost_dev *dev,
VhostBackendType backend_type);
diff --git a/include/hw/virtio/vhost-vdpa.h b/include/hw/virtio/vhost-vdpa.h
new file mode 100644
index 0000000000..6455663388
--- /dev/null
+++ b/include/hw/virtio/vhost-vdpa.h
@@ -0,0 +1,26 @@
+/*
+ * vhost-vdpa.h
+ *
+ * Copyright(c) 2017-2018 Intel Corporation.
+ * Copyright(c) 2020 Red Hat, Inc.
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2 or later.
+ * See the COPYING file in the top-level directory.
+ *
+ */
+
+#ifndef HW_VIRTIO_VHOST_VDPA_H
+#define HW_VIRTIO_VHOST_VDPA_H
+
+#include "hw/virtio/virtio.h"
+
+typedef struct vhost_vdpa {
+ int device_fd;
+ uint32_t msg_type;
+ MemoryListener listener;
+} VhostVDPA;
+
+extern AddressSpace address_space_memory;
+extern int vhost_vdpa_get_device_id(struct vhost_dev *dev,
+ uint32_t *device_id);
+#endif
diff --git a/include/hw/virtio/vhost.h b/include/hw/virtio/vhost.h
index 085450c6f8..767a95ec0b 100644
--- a/include/hw/virtio/vhost.h
+++ b/include/hw/virtio/vhost.h
@@ -92,6 +92,13 @@ struct vhost_dev {
const VhostDevConfigOps *config_ops;
};
+struct vhost_net {
+ struct vhost_dev dev;
+ struct vhost_virtqueue vqs[2];
+ int backend;
+ NetClientState *nc;
+};
+
int vhost_dev_init(struct vhost_dev *hdev, void *opaque,
VhostBackendType backend_type,
uint32_t busyloop_timeout);
diff --git a/hw/net/vhost_net.c b/hw/net/vhost_net.c
index 4561665f6b..24d555e764 100644
--- a/hw/net/vhost_net.c
+++ b/hw/net/vhost_net.c
@@ -17,6 +17,7 @@
#include "net/net.h"
#include "net/tap.h"
#include "net/vhost-user.h"
+#include "net/vhost-vdpa.h"
#include "standard-headers/linux/vhost_types.h"
#include "hw/virtio/virtio-net.h"
@@ -33,12 +34,6 @@
#include "hw/virtio/vhost.h"
#include "hw/virtio/virtio-bus.h"
-struct vhost_net {
- struct vhost_dev dev;
- struct vhost_virtqueue vqs[2];
- int backend;
- NetClientState *nc;
-};
/* Features supported by host kernel. */
static const int kernel_feature_bits[] = {
@@ -96,6 +91,11 @@ static const int *vhost_net_get_feature_bits(struct
vhost_net *net)
case NET_CLIENT_DRIVER_VHOST_USER:
feature_bits = user_feature_bits;
break;
+#ifdef CONFIG_VHOST_NET_VDPA
+ case NET_CLIENT_DRIVER_VHOST_VDPA:
+ feature_bits = vdpa_feature_bits;
+ break;
+#endif
default:
error_report("Feature bits not defined for this type: %d",
net->nc->info->type);
@@ -443,6 +443,12 @@ VHostNetState *get_vhost_net(NetClientState *nc)
vhost_net = vhost_user_get_vhost_net(nc);
assert(vhost_net);
break;
+#endif
+#ifdef CONFIG_VHOST_NET_VDPA
+ case NET_CLIENT_DRIVER_VHOST_VDPA:
+ vhost_net = vhost_vdpa_get_vhost_net(nc);
+ assert(vhost_net);
+ break;
#endif
default:
break;
diff --git a/hw/net/virtio-net.c b/hw/net/virtio-net.c
index aff67a92df..0a54b1910a 100644
--- a/hw/net/virtio-net.c
+++ b/hw/net/virtio-net.c
@@ -43,6 +43,7 @@
#include "monitor/qdev.h"
#include "hw/pci/pci.h"
#include "net_rx_pkt.h"
+#include "hw/virtio/vhost.h"
#define VIRTIO_NET_VM_VERSION 11
@@ -125,6 +126,8 @@ static void virtio_net_get_config(VirtIODevice *vdev,
uint8_t *config)
VirtIONet *n = VIRTIO_NET(vdev);
struct virtio_net_config netcfg;
+ int ret = 0;
+ memset(&netcfg, 0 , sizeof(struct virtio_net_config));
virtio_stw_p(vdev, &netcfg.status, n->status);
virtio_stw_p(vdev, &netcfg.max_virtqueue_pairs, n->max_queues);
virtio_stw_p(vdev, &netcfg.mtu, n->net_conf.mtu);
@@ -138,6 +141,15 @@ static void virtio_net_get_config(VirtIODevice *vdev,
uint8_t *config)
virtio_stl_p(vdev, &netcfg.supported_hash_types,
VIRTIO_NET_RSS_SUPPORTED_HASHES);
memcpy(config, &netcfg, n->config_size);
+
+ NetClientState *nc = qemu_get_queue(n->nic);
+ if (nc->peer->info->type == NET_CLIENT_DRIVER_VHOST_VDPA) {
+ ret = vhost_net_get_config(get_vhost_net(nc->peer), (uint8_t *)&netcfg,
+ n->config_size);
+ if (ret != -1) {
+ memcpy(config, &netcfg, n->config_size);
+ }
+ }
}
static void virtio_net_set_config(VirtIODevice *vdev, const uint8_t *config)
@@ -153,6 +165,13 @@ static void virtio_net_set_config(VirtIODevice *vdev,
const uint8_t *config)
memcpy(n->mac, netcfg.mac, ETH_ALEN);
qemu_format_nic_info_str(qemu_get_queue(n->nic), n->mac);
}
+
+ NetClientState *nc = qemu_get_queue(n->nic);
+ if (nc->peer->info->type == NET_CLIENT_DRIVER_VHOST_VDPA) {
+ vhost_net_set_config(get_vhost_net(nc->peer), (uint8_t *)&netcfg,
+ 0, n->config_size,
+ VHOST_SET_CONFIG_TYPE_MASTER);
+ }
}
static bool virtio_net_started(VirtIONet *n, uint8_t status)
diff --git a/hw/virtio/vhost-backend.c b/hw/virtio/vhost-backend.c
index 48905383f8..782b1d67d9 100644
--- a/hw/virtio/vhost-backend.c
+++ b/hw/virtio/vhost-backend.c
@@ -15,6 +15,7 @@
#include "qemu/main-loop.h"
#include "standard-headers/linux/vhost_types.h"
+#include "hw/virtio/vhost-vdpa.h"
#ifdef CONFIG_VHOST_KERNEL
#include <linux/vhost.h>
#include <sys/ioctl.h>
@@ -285,6 +286,11 @@ int vhost_set_backend_type(struct vhost_dev *dev,
VhostBackendType backend_type)
case VHOST_BACKEND_TYPE_USER:
dev->vhost_ops = &user_ops;
break;
+#endif
+#ifdef CONFIG_VHOST_VDPA
+ case VHOST_BACKEND_TYPE_VDPA:
+ dev->vhost_ops = &vdpa_ops;
+ break;
#endif
default:
error_report("Unknown vhost backend type");
diff --git a/hw/virtio/vhost-vdpa.c b/hw/virtio/vhost-vdpa.c
new file mode 100644
index 0000000000..6f2b01c25e
--- /dev/null
+++ b/hw/virtio/vhost-vdpa.c
@@ -0,0 +1,475 @@
+/*
+ * vhost-vdpa
+ *
+ * Copyright(c) 2017-2018 Intel Corporation.
+ * Copyright(c) 2020 Red Hat, Inc.
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2 or later.
+ * See the COPYING file in the top-level directory.
+ *
+ */
+
+#include "qemu/osdep.h"
+#include <linux/vhost.h>
+#include <linux/vfio.h>
+#include <sys/eventfd.h>
+#include <sys/ioctl.h>
+#include "hw/virtio/vhost.h"
+#include "hw/virtio/vhost-backend.h"
+#include "hw/virtio/virtio-net.h"
+#include "hw/virtio/vhost-vdpa.h"
+#include "qemu/main-loop.h"
+#include <linux/kvm.h>
+#include "sysemu/kvm.h"
+
+static bool vhost_vdpa_listener_skipped_section(MemoryRegionSection *section)
+{
+ return (!memory_region_is_ram(section->mr) &&
+ !memory_region_is_iommu(section->mr)) ||
+ /*
+ * Sizing an enabled 64-bit BAR can cause spurious mappings to
+ * addresses in the upper part of the 64-bit address space. These
+ * are never accessed by the CPU and beyond the address width of
+ * some IOMMU hardware. TODO: VDPA should tell us the IOMMU width.
+ */
+ section->offset_within_address_space & (1ULL << 63);
+}
+
+static int vhost_vdpa_dma_map(struct vhost_vdpa *v, hwaddr iova, hwaddr size,
+ void *vaddr, bool readonly)
+{
+ struct vhost_msg_v2 msg;
+ int fd = v->device_fd;
+ int ret = 0;
+
+ msg.type = v->msg_type;
+ msg.iotlb.iova = iova;
+ msg.iotlb.size = size;
+ msg.iotlb.uaddr = (uint64_t)vaddr;
+ msg.iotlb.perm = readonly ? VHOST_ACCESS_RO : VHOST_ACCESS_RW;
+ msg.iotlb.type = VHOST_IOTLB_UPDATE;
+
+ if (write(fd, &msg, sizeof(msg)) != sizeof(msg)) {
+ error_report("failed to write, fd=%d, errno=%d (%s)",
+ fd, errno, strerror(errno));
+ return -EIO ;
+ }
+
+ return ret;
+}
+
+static int vhost_vdpa_dma_unmap(struct vhost_vdpa *v, hwaddr iova,
+ hwaddr size)
+{
+ struct vhost_msg_v2 msg;
+ int fd = v->device_fd;
+ int ret = 0;
+
+ msg.type = v->msg_type;
+ msg.iotlb.iova = iova;
+ msg.iotlb.size = size;
+ msg.iotlb.type = VHOST_IOTLB_INVALIDATE;
+
+ if (write(fd, &msg, sizeof(msg)) != sizeof(msg)) {
+ error_report("failed to write, fd=%d, errno=%d (%s)",
+ fd, errno, strerror(errno));
+ return -EIO ;
+ }
+
+ return ret;
+}
+
+static void vhost_vdpa_listener_region_add(MemoryListener *listener,
+ MemoryRegionSection *section)
+{
+ struct vhost_vdpa *v = container_of(listener, struct vhost_vdpa, listener);
+ hwaddr iova;
+ Int128 llend, llsize;
+ void *vaddr;
+ int ret;
+
+ if (vhost_vdpa_listener_skipped_section(section)) {
+ return;
+ }
+
+ if (unlikely((section->offset_within_address_space & ~TARGET_PAGE_MASK) !=
+ (section->offset_within_region & ~TARGET_PAGE_MASK))) {
+ error_report("%s received unaligned region", __func__);
+ return;
+ }
+
+ iova = TARGET_PAGE_ALIGN(section->offset_within_address_space);
+ llend = int128_make64(section->offset_within_address_space);
+ llend = int128_add(llend, section->size);
+ llend = int128_and(llend, int128_exts64(TARGET_PAGE_MASK));
+
+ if (int128_ge(int128_make64(iova), llend)) {
+ return;
+ }
+
+ memory_region_ref(section->mr);
+
+ /* Here we assume that memory_region_is_ram(section->mr)==true */
+
+ vaddr = memory_region_get_ram_ptr(section->mr) +
+ section->offset_within_region +
+ (iova - section->offset_within_address_space);
+
+ llsize = int128_sub(llend, int128_make64(iova));
+
+ ret = vhost_vdpa_dma_map(v, iova, int128_get64(llsize),
+ vaddr, section->readonly);
+ if (ret) {
+ error_report("vhost vdpa map fail!");
+ if (memory_region_is_ram_device(section->mr)) {
+ /* Allow unexpected mappings not to be fatal for RAM devices */
+ error_report("map ram fail!");
+ return ;
+ }
+ goto fail;
+ }
+
+ return;
+
+fail:
+ if (memory_region_is_ram_device(section->mr)) {
+ error_report("failed to vdpa_dma_map. pci p2p may not work");
+ return;
+
+ }
+ /*
+ * On the initfn path, store the first error in the container so we
+ * can gracefully fail. Runtime, there's not much we can do other
+ * than throw a hardware error.
+ */
+ error_report("vhost-vdpa: DMA mapping failed, unable to continue");
+ return;
+
+}
+
+static void vhost_vdpa_listener_region_del(MemoryListener *listener,
+ MemoryRegionSection *section)
+{
+ struct vhost_vdpa *v = container_of(listener, struct vhost_vdpa, listener);
+ hwaddr iova;
+ Int128 llend, llsize;
+ int ret;
+ bool try_unmap = true;
+
+ if (vhost_vdpa_listener_skipped_section(section)) {
+ return;
+ }
+
+ if (unlikely((section->offset_within_address_space & ~TARGET_PAGE_MASK) !=
+ (section->offset_within_region & ~TARGET_PAGE_MASK))) {
+ error_report("%s received unaligned region", __func__);
+ return;
+ }
+
+ iova = TARGET_PAGE_ALIGN(section->offset_within_address_space);
+ llend = int128_make64(section->offset_within_address_space);
+ llend = int128_add(llend, section->size);
+ llend = int128_and(llend, int128_exts64(TARGET_PAGE_MASK));
+
+ if (int128_ge(int128_make64(iova), llend)) {
+ return;
+ }
+
+ llsize = int128_sub(llend, int128_make64(iova));
+
+ if (try_unmap) {
+ ret = vhost_vdpa_dma_unmap(v, iova, int128_get64(llsize));
+ if (ret) {
+ error_report("vhost_vdpa dma unmap error!");
+ }
+ }
+
+ memory_region_unref(section->mr);
+}
+/*
+ * IOTLB API is used by vhost-vpda which requires incremental updating
+ * of the mapping. So we can not use generic vhost memory listener which
+ * depends on the addnop().
+ */
+static const MemoryListener vhost_vdpa_memory_listener = {
+ .region_add = vhost_vdpa_listener_region_add,
+ .region_del = vhost_vdpa_listener_region_del,
+};
+
+static int vhost_vdpa_call(struct vhost_dev *dev, unsigned long int request,
+ void *arg)
+{
+ struct vhost_vdpa *v = dev->opaque;
+ int fd = v->device_fd;
+
+ assert(dev->vhost_ops->backend_type == VHOST_BACKEND_TYPE_VDPA);
+
+ return ioctl(fd, request, arg);
+}
+
+static void vhost_vdpa_add_status(struct vhost_dev *dev, uint8_t status)
+{
+ uint8_t s;
+
+ if (vhost_vdpa_call(dev, VHOST_VDPA_GET_STATUS, &s)) {
+ return;
+ }
+
+ s |= status;
+
+ vhost_vdpa_call(dev, VHOST_VDPA_SET_STATUS, &s);
+}
+
+static int vhost_vdpa_init(struct vhost_dev *dev, void *opaque)
+{
+ struct vhost_vdpa *v;
+ uint64_t features;
+ assert(dev->vhost_ops->backend_type == VHOST_BACKEND_TYPE_VDPA);
+
+ v = opaque;
+ dev->opaque = opaque ;
+ vhost_vdpa_call(dev, VHOST_GET_FEATURES, &features);
+ dev->backend_features = features;
+ v->listener = vhost_vdpa_memory_listener;
+ v->msg_type = VHOST_IOTLB_MSG_V2;
+
+ vhost_vdpa_add_status(dev, VIRTIO_CONFIG_S_ACKNOWLEDGE |
+ VIRTIO_CONFIG_S_DRIVER);
+
+ return 0;
+}
+
+static int vhost_vdpa_cleanup(struct vhost_dev *dev)
+{
+ struct vhost_vdpa *v;
+ assert(dev->vhost_ops->backend_type == VHOST_BACKEND_TYPE_VDPA);
+ v = dev->opaque;
+ memory_listener_unregister(&v->listener);
+
+ dev->opaque = NULL;
+ return 0;
+}
+
+static int vhost_vdpa_memslots_limit(struct vhost_dev *dev)
+{
+ return INT_MAX;
+}
+
+static int vhost_vdpa_set_mem_table(struct vhost_dev *dev,
+ struct vhost_memory *mem)
+{
+
+ if (mem->padding) {
+ return -1;
+ }
+
+ return 0;
+}
+
+static int vhost_vdpa_set_features(struct vhost_dev *dev,
+ uint64_t features)
+{
+ int ret;
+ ret = vhost_vdpa_call(dev, VHOST_SET_FEATURES, &features);
+ uint8_t status = 0;
+ if (ret) {
+ return ret;
+ }
+ vhost_vdpa_add_status(dev, VIRTIO_CONFIG_S_FEATURES_OK);
+ vhost_vdpa_call(dev, VHOST_VDPA_GET_STATUS, &status);
+
+ return !(status & VIRTIO_CONFIG_S_FEATURES_OK);
+}
+
+int vhost_vdpa_get_device_id(struct vhost_dev *dev,
+ uint32_t *device_id)
+{
+ return vhost_vdpa_call(dev, VHOST_VDPA_GET_DEVICE_ID, device_id);
+}
+
+static int vhost_vdpa_reset_device(struct vhost_dev *dev)
+{
+ uint8_t status = 0;
+
+ return vhost_vdpa_call(dev, VHOST_VDPA_SET_STATUS, &status);
+}
+
+static int vhost_vdpa_get_vq_index(struct vhost_dev *dev, int idx)
+{
+ assert(idx >= dev->vq_index && idx < dev->vq_index + dev->nvqs);
+
+ return idx - dev->vq_index;
+}
+
+static int vhost_vdpa_set_vring_ready(struct vhost_dev *dev)
+{
+ int i;
+ for (i = 0; i < dev->nvqs; ++i) {
+ struct vhost_vring_state state = {
+ .index = dev->vq_index + i,
+ .num = 1,
+ };
+ vhost_vdpa_call(dev, VHOST_VDPA_SET_VRING_ENABLE, &state);
+ }
+ return 0;
+}
+
+static int vhost_vdpa_set_config(struct vhost_dev *dev, const uint8_t *data,
+ uint32_t offset, uint32_t size,
+ uint32_t flags)
+{
+ struct vhost_vdpa_config *config;
+ int ret;
+ unsigned long config_size = offsetof(struct vhost_vdpa_config, buf);
+ config = g_malloc(size + config_size);
+ if (config == NULL) {
+ return -1;
+ }
+ config->off = offset;
+ config->len = size;
+ memcpy(config->buf, data, size);
+ ret = vhost_vdpa_call(dev, VHOST_VDPA_SET_CONFIG, config);
+ g_free(config);
+ return ret;
+}
+
+static int vhost_vdpa_get_config(struct vhost_dev *dev, uint8_t *config,
+ uint32_t config_len)
+{
+ struct vhost_vdpa_config *v_config;
+ unsigned long config_size = offsetof(struct vhost_vdpa_config, buf);
+ int ret;
+
+ v_config = g_malloc(config_len + config_size);
+ if (v_config == NULL) {
+ return -1;
+ }
+ v_config->len = config_len;
+ v_config->off = 0;
+ ret = vhost_vdpa_call(dev, VHOST_VDPA_GET_CONFIG, v_config);
+ memcpy(config, v_config->buf, config_len);
+ g_free(v_config);
+ return ret;
+ }
+
+static int vhost_vdpa_dev_start(struct vhost_dev *dev, bool started)
+{
+ struct vhost_vdpa *v = dev->opaque;
+ if (started) {
+ uint8_t status = 0;
+ memory_listener_register(&v->listener, &address_space_memory);
+ vhost_vdpa_set_vring_ready(dev);
+ vhost_vdpa_add_status(dev, VIRTIO_CONFIG_S_DRIVER_OK);
+ vhost_vdpa_call(dev, VHOST_VDPA_GET_STATUS, &status);
+
+ return !(status & VIRTIO_CONFIG_S_DRIVER_OK);
+ } else {
+ vhost_vdpa_reset_device(dev);
+ vhost_vdpa_add_status(dev, VIRTIO_CONFIG_S_ACKNOWLEDGE |
+ VIRTIO_CONFIG_S_DRIVER);
+ memory_listener_unregister(&v->listener);
+
+ return 0;
+ }
+}
+
+static int vhost_vdpa_set_log_base(struct vhost_dev *dev, uint64_t base,
+ struct vhost_log *log)
+{
+ return vhost_vdpa_call(dev, VHOST_SET_LOG_BASE, &base);
+}
+
+static int vhost_vdpa_set_vring_addr(struct vhost_dev *dev,
+ struct vhost_vring_addr *addr)
+{
+ return vhost_vdpa_call(dev, VHOST_SET_VRING_ADDR, addr);
+}
+
+static int vhost_vdpa_set_vring_num(struct vhost_dev *dev,
+ struct vhost_vring_state *ring)
+{
+ return vhost_vdpa_call(dev, VHOST_SET_VRING_NUM, ring);
+}
+
+static int vhost_vdpa_set_vring_base(struct vhost_dev *dev,
+ struct vhost_vring_state *ring)
+{
+ return vhost_vdpa_call(dev, VHOST_SET_VRING_BASE, ring);
+}
+
+static int vhost_vdpa_get_vring_base(struct vhost_dev *dev,
+ struct vhost_vring_state *ring)
+{
+ return vhost_vdpa_call(dev, VHOST_GET_VRING_BASE, ring);
+}
+
+static int vhost_vdpa_set_vring_kick(struct vhost_dev *dev,
+ struct vhost_vring_file *file)
+{
+ return vhost_vdpa_call(dev, VHOST_SET_VRING_KICK, file);
+}
+
+static int vhost_vdpa_set_vring_call(struct vhost_dev *dev,
+ struct vhost_vring_file *file)
+{
+ return vhost_vdpa_call(dev, VHOST_SET_VRING_CALL, file);
+}
+
+static int vhost_vdpa_get_features(struct vhost_dev *dev,
+ uint64_t *features)
+{
+ return vhost_vdpa_call(dev, VHOST_GET_FEATURES, features);
+}
+
+static int vhost_vdpa_set_owner(struct vhost_dev *dev)
+{
+ return vhost_vdpa_call(dev, VHOST_SET_OWNER, NULL);
+}
+
+static int vhost_vdpa_vq_get_addr(struct vhost_dev *dev,
+ struct vhost_vring_addr *addr, struct vhost_virtqueue *vq)
+{
+ assert(dev->vhost_ops->backend_type == VHOST_BACKEND_TYPE_VDPA);
+ addr->desc_user_addr = (uint64_t)(unsigned long)vq->desc_phys;
+ addr->avail_user_addr = (uint64_t)(unsigned long)vq->avail_phys;
+ addr->used_user_addr = (uint64_t)(unsigned long)vq->used_phys;
+ return 0;
+}
+
+static bool vhost_vdpa_force_iommu(struct vhost_dev *dev)
+{
+ return true;
+}
+
+const VhostOps vdpa_ops = {
+ .backend_type = VHOST_BACKEND_TYPE_VDPA,
+ .vhost_backend_init = vhost_vdpa_init,
+ .vhost_backend_cleanup = vhost_vdpa_cleanup,
+ .vhost_set_log_base = vhost_vdpa_set_log_base,
+ .vhost_set_vring_addr = vhost_vdpa_set_vring_addr,
+ .vhost_set_vring_num = vhost_vdpa_set_vring_num,
+ .vhost_set_vring_base = vhost_vdpa_set_vring_base,
+ .vhost_get_vring_base = vhost_vdpa_get_vring_base,
+ .vhost_set_vring_kick = vhost_vdpa_set_vring_kick,
+ .vhost_set_vring_call = vhost_vdpa_set_vring_call,
+ .vhost_get_features = vhost_vdpa_get_features,
+ .vhost_set_owner = vhost_vdpa_set_owner,
+ .vhost_set_vring_endian = NULL,
+ .vhost_backend_memslots_limit = vhost_vdpa_memslots_limit,
+ .vhost_set_mem_table = vhost_vdpa_set_mem_table,
+ .vhost_set_features = vhost_vdpa_set_features,
+ .vhost_reset_device = vhost_vdpa_reset_device,
+ .vhost_get_vq_index = vhost_vdpa_get_vq_index,
+ .vhost_get_config = vhost_vdpa_get_config,
+ .vhost_set_config = vhost_vdpa_set_config,
+ .vhost_requires_shm_log = NULL,
+ .vhost_migration_done = NULL,
+ .vhost_backend_can_merge = NULL,
+ .vhost_net_set_mtu = NULL,
+ .vhost_set_iotlb_callback = NULL,
+ .vhost_send_device_iotlb_msg = NULL,
+ .vhost_dev_start = vhost_vdpa_dev_start,
+ .vhost_get_device_id = vhost_vdpa_get_device_id,
+ .vhost_vq_get_addr = vhost_vdpa_vq_get_addr,
+ .vhost_force_iommu = vhost_vdpa_force_iommu,
+};
diff --git a/docs/interop/index.rst b/docs/interop/index.rst
index 049387ac6d..006f986420 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 0000000000..0c70ba01bc
--- /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
diff --git a/hw/virtio/Makefile.objs b/hw/virtio/Makefile.objs
index a986708186..fc91719b4a 100644
--- a/hw/virtio/Makefile.objs
+++ b/hw/virtio/Makefile.objs
@@ -5,6 +5,7 @@ obj-y += virtio.o
obj-$(CONFIG_VHOST) += vhost.o vhost-backend.o
common-obj-$(call lnot,$(CONFIG_VHOST)) += vhost-stub.o
obj-$(CONFIG_VHOST_USER) += vhost-user.o
+obj-$(CONFIG_VHOST_VDPA) += vhost-vdpa.o
common-obj-$(CONFIG_VIRTIO_RNG) += virtio-rng.o
common-obj-$(CONFIG_VIRTIO_PCI) += virtio-pci.o
diff --git a/qemu-options.hx b/qemu-options.hx
index 196f468786..fa1b19de4c 100644
--- a/qemu-options.hx
+++ b/qemu-options.hx
@@ -2418,6 +2418,10 @@ DEF("netdev", HAS_ARG, QEMU_OPTION_netdev,
#ifdef CONFIG_POSIX
"-netdev vhost-user,id=str,chardev=dev[,vhostforce=on|off]\n"
" configure a vhost-user network, backed by a chardev
'dev'\n"
+#endif
+#ifdef __linux__
+ "-netdev vhost-vdpa,id=str,vhostdev=/path/to/dev\n"
+ " configure a vhost-vdpa network,Establish a vhost-vdpa
netdev\n"
#endif
"-netdev hubport,id=str,hubid=n[,netdev=nd]\n"
" configure a hub port on the hub with ID 'n'\n",
QEMU_ARCH_ALL)
@@ -2897,6 +2901,14 @@ SRST
-netdev type=vhost-user,id=net0,chardev=chr0 \
-device virtio-net-pci,netdev=net0
+``-netdev vhost-vdpa,vhostdev=/path/to/dev``
+ Establish a vhost-vdpa netdev.
+
+ vDPA device is a device that uses a datapath which complies with
+ the virtio specifications with a vendor specific control path.
+ vDPA devices can be both physically located on the hardware or
+ emulated by software.
+
``-netdev hubport,id=id,hubid=hubid[,netdev=nd]``
Create a hub port on the emulated hub with ID hubid.
--
MST
