hw/virtio/vhost-vdpa.c - qemu - Git at Google

 /*
  * 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 "cpu.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)(uintptr_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,
 };
	/*
	* 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 "cpu.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)(uintptr_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,
	};