diff options
| -rw-r--r-- | hw/virtio/vhost-user.c | 127 |
1 files changed, 67 insertions, 60 deletions
diff --git a/hw/virtio/vhost-user.c b/hw/virtio/vhost-user.c index b57454a4b7..1a7d53c8f4 100644 --- a/hw/virtio/vhost-user.c +++ b/hw/virtio/vhost-user.c @@ -263,66 +263,6 @@ static int vhost_user_set_log_base(struct vhost_dev *dev, uint64_t base, return 0; } -static int vhost_user_set_mem_table(struct vhost_dev *dev, - struct vhost_memory *mem) -{ - int fds[VHOST_MEMORY_MAX_NREGIONS]; - int i, fd; - size_t fd_num = 0; - bool reply_supported = virtio_has_feature(dev->protocol_features, - VHOST_USER_PROTOCOL_F_REPLY_ACK); - - VhostUserMsg msg = { - .request = VHOST_USER_SET_MEM_TABLE, - .flags = VHOST_USER_VERSION, - }; - - if (reply_supported) { - msg.flags |= VHOST_USER_NEED_REPLY_MASK; - } - - for (i = 0; i < dev->mem->nregions; ++i) { - struct vhost_memory_region *reg = dev->mem->regions + i; - ram_addr_t offset; - MemoryRegion *mr; - - assert((uintptr_t)reg->userspace_addr == reg->userspace_addr); - mr = memory_region_from_host((void *)(uintptr_t)reg->userspace_addr, - &offset); - fd = memory_region_get_fd(mr); - if (fd > 0) { - msg.payload.memory.regions[fd_num].userspace_addr = reg->userspace_addr; - msg.payload.memory.regions[fd_num].memory_size = reg->memory_size; - msg.payload.memory.regions[fd_num].guest_phys_addr = reg->guest_phys_addr; - msg.payload.memory.regions[fd_num].mmap_offset = offset; - assert(fd_num < VHOST_MEMORY_MAX_NREGIONS); - fds[fd_num++] = fd; - } - } - - msg.payload.memory.nregions = fd_num; - - if (!fd_num) { - error_report("Failed initializing vhost-user memory map, " - "consider using -object memory-backend-file share=on"); - return -1; - } - - msg.size = sizeof(msg.payload.memory.nregions); - msg.size += sizeof(msg.payload.memory.padding); - msg.size += fd_num * sizeof(VhostUserMemoryRegion); - - if (vhost_user_write(dev, &msg, fds, fd_num) < 0) { - return -1; - } - - if (reply_supported) { - return process_message_reply(dev, msg.request); - } - - return 0; -} - static int vhost_user_set_vring_addr(struct vhost_dev *dev, struct vhost_vring_addr *addr) { @@ -537,6 +477,73 @@ static int vhost_user_get_features(struct vhost_dev *dev, uint64_t *features) return vhost_user_get_u64(dev, VHOST_USER_GET_FEATURES, features); } +static int vhost_user_set_mem_table(struct vhost_dev *dev, + struct vhost_memory *mem) +{ + int fds[VHOST_MEMORY_MAX_NREGIONS]; + int i, fd; + size_t fd_num = 0; + uint64_t features; + bool reply_supported = virtio_has_feature(dev->protocol_features, + VHOST_USER_PROTOCOL_F_REPLY_ACK); + + VhostUserMsg msg = { + .request = VHOST_USER_SET_MEM_TABLE, + .flags = VHOST_USER_VERSION, + }; + + if (reply_supported) { + msg.flags |= VHOST_USER_NEED_REPLY_MASK; + } + + for (i = 0; i < dev->mem->nregions; ++i) { + struct vhost_memory_region *reg = dev->mem->regions + i; + ram_addr_t offset; + MemoryRegion *mr; + + assert((uintptr_t)reg->userspace_addr == reg->userspace_addr); + mr = memory_region_from_host((void *)(uintptr_t)reg->userspace_addr, + &offset); + fd = memory_region_get_fd(mr); + if (fd > 0) { + msg.payload.memory.regions[fd_num].userspace_addr + = reg->userspace_addr; + msg.payload.memory.regions[fd_num].memory_size = reg->memory_size; + msg.payload.memory.regions[fd_num].guest_phys_addr + = reg->guest_phys_addr; + msg.payload.memory.regions[fd_num].mmap_offset = offset; + assert(fd_num < VHOST_MEMORY_MAX_NREGIONS); + fds[fd_num++] = fd; + } + } + + msg.payload.memory.nregions = fd_num; + + if (!fd_num) { + error_report("Failed initializing vhost-user memory map, " + "consider using -object memory-backend-file share=on"); + return -1; + } + + msg.size = sizeof(msg.payload.memory.nregions); + msg.size += sizeof(msg.payload.memory.padding); + msg.size += fd_num * sizeof(VhostUserMemoryRegion); + + vhost_user_write(dev, &msg, fds, fd_num); + + if (reply_supported) { + return process_message_reply(dev, msg.request); + } else { + /* Note: It is (yet) unknown when the client application has finished + * remapping the GPA. + * Attempt to prevent a race by sending a command that requires a reply. + */ + vhost_user_get_features(dev, &features); + } + + return 0; +} + static int vhost_user_set_owner(struct vhost_dev *dev) { VhostUserMsg msg = { |