474 lines
14 KiB
C
474 lines
14 KiB
C
/*
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* vhost-vdpa
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*
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* Copyright(c) 2017-2018 Intel Corporation.
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* Copyright(c) 2020 Red Hat, Inc.
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*
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* This work is licensed under the terms of the GNU GPL, version 2 or later.
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* See the COPYING file in the top-level directory.
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*
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*/
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#include "qemu/osdep.h"
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#include <linux/vhost.h>
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#include <linux/vfio.h>
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#include <sys/eventfd.h>
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#include <sys/ioctl.h>
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#include "hw/virtio/vhost.h"
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#include "hw/virtio/vhost-backend.h"
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#include "hw/virtio/virtio-net.h"
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#include "hw/virtio/vhost-vdpa.h"
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#include "qemu/main-loop.h"
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#include "cpu.h"
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static bool vhost_vdpa_listener_skipped_section(MemoryRegionSection *section)
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{
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return (!memory_region_is_ram(section->mr) &&
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!memory_region_is_iommu(section->mr)) ||
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/*
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* Sizing an enabled 64-bit BAR can cause spurious mappings to
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* addresses in the upper part of the 64-bit address space. These
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* are never accessed by the CPU and beyond the address width of
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* some IOMMU hardware. TODO: VDPA should tell us the IOMMU width.
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*/
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section->offset_within_address_space & (1ULL << 63);
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}
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static int vhost_vdpa_dma_map(struct vhost_vdpa *v, hwaddr iova, hwaddr size,
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void *vaddr, bool readonly)
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{
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struct vhost_msg_v2 msg = {};
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int fd = v->device_fd;
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int ret = 0;
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msg.type = v->msg_type;
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msg.iotlb.iova = iova;
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msg.iotlb.size = size;
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msg.iotlb.uaddr = (uint64_t)(uintptr_t)vaddr;
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msg.iotlb.perm = readonly ? VHOST_ACCESS_RO : VHOST_ACCESS_RW;
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msg.iotlb.type = VHOST_IOTLB_UPDATE;
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if (write(fd, &msg, sizeof(msg)) != sizeof(msg)) {
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error_report("failed to write, fd=%d, errno=%d (%s)",
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fd, errno, strerror(errno));
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return -EIO ;
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}
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return ret;
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}
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static int vhost_vdpa_dma_unmap(struct vhost_vdpa *v, hwaddr iova,
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hwaddr size)
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{
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struct vhost_msg_v2 msg = {};
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int fd = v->device_fd;
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int ret = 0;
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msg.type = v->msg_type;
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msg.iotlb.iova = iova;
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msg.iotlb.size = size;
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msg.iotlb.type = VHOST_IOTLB_INVALIDATE;
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if (write(fd, &msg, sizeof(msg)) != sizeof(msg)) {
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error_report("failed to write, fd=%d, errno=%d (%s)",
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fd, errno, strerror(errno));
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return -EIO ;
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}
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return ret;
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}
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static void vhost_vdpa_listener_region_add(MemoryListener *listener,
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MemoryRegionSection *section)
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{
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struct vhost_vdpa *v = container_of(listener, struct vhost_vdpa, listener);
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hwaddr iova;
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Int128 llend, llsize;
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void *vaddr;
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int ret;
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if (vhost_vdpa_listener_skipped_section(section)) {
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return;
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}
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if (unlikely((section->offset_within_address_space & ~TARGET_PAGE_MASK) !=
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(section->offset_within_region & ~TARGET_PAGE_MASK))) {
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error_report("%s received unaligned region", __func__);
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return;
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}
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iova = TARGET_PAGE_ALIGN(section->offset_within_address_space);
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llend = int128_make64(section->offset_within_address_space);
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llend = int128_add(llend, section->size);
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llend = int128_and(llend, int128_exts64(TARGET_PAGE_MASK));
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if (int128_ge(int128_make64(iova), llend)) {
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return;
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}
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memory_region_ref(section->mr);
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/* Here we assume that memory_region_is_ram(section->mr)==true */
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vaddr = memory_region_get_ram_ptr(section->mr) +
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section->offset_within_region +
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(iova - section->offset_within_address_space);
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llsize = int128_sub(llend, int128_make64(iova));
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ret = vhost_vdpa_dma_map(v, iova, int128_get64(llsize),
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vaddr, section->readonly);
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if (ret) {
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error_report("vhost vdpa map fail!");
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if (memory_region_is_ram_device(section->mr)) {
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/* Allow unexpected mappings not to be fatal for RAM devices */
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error_report("map ram fail!");
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return ;
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}
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goto fail;
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}
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return;
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fail:
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if (memory_region_is_ram_device(section->mr)) {
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error_report("failed to vdpa_dma_map. pci p2p may not work");
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return;
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}
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/*
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* On the initfn path, store the first error in the container so we
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* can gracefully fail. Runtime, there's not much we can do other
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* than throw a hardware error.
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*/
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error_report("vhost-vdpa: DMA mapping failed, unable to continue");
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return;
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}
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static void vhost_vdpa_listener_region_del(MemoryListener *listener,
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MemoryRegionSection *section)
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{
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struct vhost_vdpa *v = container_of(listener, struct vhost_vdpa, listener);
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hwaddr iova;
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Int128 llend, llsize;
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int ret;
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bool try_unmap = true;
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if (vhost_vdpa_listener_skipped_section(section)) {
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return;
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}
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if (unlikely((section->offset_within_address_space & ~TARGET_PAGE_MASK) !=
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(section->offset_within_region & ~TARGET_PAGE_MASK))) {
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error_report("%s received unaligned region", __func__);
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return;
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}
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iova = TARGET_PAGE_ALIGN(section->offset_within_address_space);
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llend = int128_make64(section->offset_within_address_space);
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llend = int128_add(llend, section->size);
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llend = int128_and(llend, int128_exts64(TARGET_PAGE_MASK));
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if (int128_ge(int128_make64(iova), llend)) {
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return;
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}
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llsize = int128_sub(llend, int128_make64(iova));
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if (try_unmap) {
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ret = vhost_vdpa_dma_unmap(v, iova, int128_get64(llsize));
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if (ret) {
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error_report("vhost_vdpa dma unmap error!");
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}
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}
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memory_region_unref(section->mr);
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}
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/*
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* IOTLB API is used by vhost-vpda which requires incremental updating
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* of the mapping. So we can not use generic vhost memory listener which
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* depends on the addnop().
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*/
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static const MemoryListener vhost_vdpa_memory_listener = {
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.region_add = vhost_vdpa_listener_region_add,
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.region_del = vhost_vdpa_listener_region_del,
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};
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static int vhost_vdpa_call(struct vhost_dev *dev, unsigned long int request,
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void *arg)
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{
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struct vhost_vdpa *v = dev->opaque;
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int fd = v->device_fd;
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assert(dev->vhost_ops->backend_type == VHOST_BACKEND_TYPE_VDPA);
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return ioctl(fd, request, arg);
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}
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static void vhost_vdpa_add_status(struct vhost_dev *dev, uint8_t status)
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{
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uint8_t s;
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if (vhost_vdpa_call(dev, VHOST_VDPA_GET_STATUS, &s)) {
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return;
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}
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s |= status;
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vhost_vdpa_call(dev, VHOST_VDPA_SET_STATUS, &s);
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}
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static int vhost_vdpa_init(struct vhost_dev *dev, void *opaque)
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{
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struct vhost_vdpa *v;
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uint64_t features;
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assert(dev->vhost_ops->backend_type == VHOST_BACKEND_TYPE_VDPA);
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v = opaque;
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dev->opaque = opaque ;
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vhost_vdpa_call(dev, VHOST_GET_FEATURES, &features);
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dev->backend_features = features;
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v->listener = vhost_vdpa_memory_listener;
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v->msg_type = VHOST_IOTLB_MSG_V2;
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vhost_vdpa_add_status(dev, VIRTIO_CONFIG_S_ACKNOWLEDGE |
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VIRTIO_CONFIG_S_DRIVER);
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return 0;
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}
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static int vhost_vdpa_cleanup(struct vhost_dev *dev)
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{
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struct vhost_vdpa *v;
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assert(dev->vhost_ops->backend_type == VHOST_BACKEND_TYPE_VDPA);
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v = dev->opaque;
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memory_listener_unregister(&v->listener);
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dev->opaque = NULL;
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return 0;
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}
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static int vhost_vdpa_memslots_limit(struct vhost_dev *dev)
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{
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return INT_MAX;
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}
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static int vhost_vdpa_set_mem_table(struct vhost_dev *dev,
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struct vhost_memory *mem)
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{
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if (mem->padding) {
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return -1;
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}
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return 0;
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}
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static int vhost_vdpa_set_features(struct vhost_dev *dev,
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uint64_t features)
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{
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int ret;
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ret = vhost_vdpa_call(dev, VHOST_SET_FEATURES, &features);
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uint8_t status = 0;
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if (ret) {
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return ret;
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}
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vhost_vdpa_add_status(dev, VIRTIO_CONFIG_S_FEATURES_OK);
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vhost_vdpa_call(dev, VHOST_VDPA_GET_STATUS, &status);
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return !(status & VIRTIO_CONFIG_S_FEATURES_OK);
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}
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int vhost_vdpa_get_device_id(struct vhost_dev *dev,
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uint32_t *device_id)
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{
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return vhost_vdpa_call(dev, VHOST_VDPA_GET_DEVICE_ID, device_id);
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}
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static int vhost_vdpa_reset_device(struct vhost_dev *dev)
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{
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uint8_t status = 0;
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return vhost_vdpa_call(dev, VHOST_VDPA_SET_STATUS, &status);
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}
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static int vhost_vdpa_get_vq_index(struct vhost_dev *dev, int idx)
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{
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assert(idx >= dev->vq_index && idx < dev->vq_index + dev->nvqs);
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return idx - dev->vq_index;
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}
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static int vhost_vdpa_set_vring_ready(struct vhost_dev *dev)
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{
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int i;
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for (i = 0; i < dev->nvqs; ++i) {
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struct vhost_vring_state state = {
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.index = dev->vq_index + i,
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.num = 1,
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};
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vhost_vdpa_call(dev, VHOST_VDPA_SET_VRING_ENABLE, &state);
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}
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return 0;
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}
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static int vhost_vdpa_set_config(struct vhost_dev *dev, const uint8_t *data,
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uint32_t offset, uint32_t size,
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uint32_t flags)
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{
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struct vhost_vdpa_config *config;
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int ret;
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unsigned long config_size = offsetof(struct vhost_vdpa_config, buf);
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config = g_malloc(size + config_size);
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if (config == NULL) {
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return -1;
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}
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config->off = offset;
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config->len = size;
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memcpy(config->buf, data, size);
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ret = vhost_vdpa_call(dev, VHOST_VDPA_SET_CONFIG, config);
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g_free(config);
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return ret;
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}
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static int vhost_vdpa_get_config(struct vhost_dev *dev, uint8_t *config,
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uint32_t config_len)
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{
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struct vhost_vdpa_config *v_config;
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unsigned long config_size = offsetof(struct vhost_vdpa_config, buf);
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int ret;
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v_config = g_malloc(config_len + config_size);
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if (v_config == NULL) {
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return -1;
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}
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v_config->len = config_len;
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v_config->off = 0;
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ret = vhost_vdpa_call(dev, VHOST_VDPA_GET_CONFIG, v_config);
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memcpy(config, v_config->buf, config_len);
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g_free(v_config);
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return ret;
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}
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static int vhost_vdpa_dev_start(struct vhost_dev *dev, bool started)
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{
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struct vhost_vdpa *v = dev->opaque;
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if (started) {
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uint8_t status = 0;
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memory_listener_register(&v->listener, &address_space_memory);
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vhost_vdpa_set_vring_ready(dev);
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vhost_vdpa_add_status(dev, VIRTIO_CONFIG_S_DRIVER_OK);
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vhost_vdpa_call(dev, VHOST_VDPA_GET_STATUS, &status);
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return !(status & VIRTIO_CONFIG_S_DRIVER_OK);
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} else {
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vhost_vdpa_reset_device(dev);
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vhost_vdpa_add_status(dev, VIRTIO_CONFIG_S_ACKNOWLEDGE |
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VIRTIO_CONFIG_S_DRIVER);
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memory_listener_unregister(&v->listener);
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return 0;
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}
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}
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static int vhost_vdpa_set_log_base(struct vhost_dev *dev, uint64_t base,
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struct vhost_log *log)
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{
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return vhost_vdpa_call(dev, VHOST_SET_LOG_BASE, &base);
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}
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static int vhost_vdpa_set_vring_addr(struct vhost_dev *dev,
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struct vhost_vring_addr *addr)
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{
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return vhost_vdpa_call(dev, VHOST_SET_VRING_ADDR, addr);
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}
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static int vhost_vdpa_set_vring_num(struct vhost_dev *dev,
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struct vhost_vring_state *ring)
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{
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return vhost_vdpa_call(dev, VHOST_SET_VRING_NUM, ring);
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}
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static int vhost_vdpa_set_vring_base(struct vhost_dev *dev,
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struct vhost_vring_state *ring)
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{
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return vhost_vdpa_call(dev, VHOST_SET_VRING_BASE, ring);
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}
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static int vhost_vdpa_get_vring_base(struct vhost_dev *dev,
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struct vhost_vring_state *ring)
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{
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return vhost_vdpa_call(dev, VHOST_GET_VRING_BASE, ring);
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}
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static int vhost_vdpa_set_vring_kick(struct vhost_dev *dev,
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struct vhost_vring_file *file)
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{
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return vhost_vdpa_call(dev, VHOST_SET_VRING_KICK, file);
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}
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static int vhost_vdpa_set_vring_call(struct vhost_dev *dev,
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struct vhost_vring_file *file)
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{
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return vhost_vdpa_call(dev, VHOST_SET_VRING_CALL, file);
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}
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static int vhost_vdpa_get_features(struct vhost_dev *dev,
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uint64_t *features)
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{
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return vhost_vdpa_call(dev, VHOST_GET_FEATURES, features);
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}
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static int vhost_vdpa_set_owner(struct vhost_dev *dev)
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{
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return vhost_vdpa_call(dev, VHOST_SET_OWNER, NULL);
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}
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static int vhost_vdpa_vq_get_addr(struct vhost_dev *dev,
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struct vhost_vring_addr *addr, struct vhost_virtqueue *vq)
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{
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assert(dev->vhost_ops->backend_type == VHOST_BACKEND_TYPE_VDPA);
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addr->desc_user_addr = (uint64_t)(unsigned long)vq->desc_phys;
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addr->avail_user_addr = (uint64_t)(unsigned long)vq->avail_phys;
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addr->used_user_addr = (uint64_t)(unsigned long)vq->used_phys;
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return 0;
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}
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static bool vhost_vdpa_force_iommu(struct vhost_dev *dev)
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{
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return true;
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}
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const VhostOps vdpa_ops = {
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.backend_type = VHOST_BACKEND_TYPE_VDPA,
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.vhost_backend_init = vhost_vdpa_init,
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.vhost_backend_cleanup = vhost_vdpa_cleanup,
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.vhost_set_log_base = vhost_vdpa_set_log_base,
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.vhost_set_vring_addr = vhost_vdpa_set_vring_addr,
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.vhost_set_vring_num = vhost_vdpa_set_vring_num,
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.vhost_set_vring_base = vhost_vdpa_set_vring_base,
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.vhost_get_vring_base = vhost_vdpa_get_vring_base,
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.vhost_set_vring_kick = vhost_vdpa_set_vring_kick,
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.vhost_set_vring_call = vhost_vdpa_set_vring_call,
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.vhost_get_features = vhost_vdpa_get_features,
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.vhost_set_owner = vhost_vdpa_set_owner,
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.vhost_set_vring_endian = NULL,
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.vhost_backend_memslots_limit = vhost_vdpa_memslots_limit,
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.vhost_set_mem_table = vhost_vdpa_set_mem_table,
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.vhost_set_features = vhost_vdpa_set_features,
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.vhost_reset_device = vhost_vdpa_reset_device,
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.vhost_get_vq_index = vhost_vdpa_get_vq_index,
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.vhost_get_config = vhost_vdpa_get_config,
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.vhost_set_config = vhost_vdpa_set_config,
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.vhost_requires_shm_log = NULL,
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.vhost_migration_done = NULL,
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.vhost_backend_can_merge = NULL,
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.vhost_net_set_mtu = NULL,
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.vhost_set_iotlb_callback = NULL,
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.vhost_send_device_iotlb_msg = NULL,
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.vhost_dev_start = vhost_vdpa_dev_start,
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.vhost_get_device_id = vhost_vdpa_get_device_id,
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.vhost_vq_get_addr = vhost_vdpa_vq_get_addr,
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.vhost_force_iommu = vhost_vdpa_force_iommu,
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};
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