From: Pravin M Bathija <[email protected]> These changes cover the function definition for add/remove memory region calls which are invoked on receiving vhost user message from vhost user front-end (e.g. Qemu). In our case, in addition to testing with qemu front-end, the testing has also been performed with libblkio front-end and spdk/dpdk back-end. We did I/O using libblkio based device driver, to spdk based drives. There are also changes for set_mem_table and new definition for get memory slots. Our changes optimize the set memory table call to use common support functions. Message get memory slots is how the vhost-user front-end queries the vhost-user back-end about the number of memory slots available to be registered by the back-end. In addition support function to invalidate vring is also defined which is used in add/remove memory region functions.
Signed-off-by: Pravin M Bathija <[email protected]> --- lib/vhost/vhost_user.c | 257 +++++++++++++++++++++++++++++++++++------ 1 file changed, 224 insertions(+), 33 deletions(-) diff --git a/lib/vhost/vhost_user.c b/lib/vhost/vhost_user.c index 1f96ecf963..a296adde39 100644 --- a/lib/vhost/vhost_user.c +++ b/lib/vhost/vhost_user.c @@ -71,6 +71,9 @@ VHOST_MESSAGE_HANDLER(VHOST_USER_SET_FEATURES, vhost_user_set_features, false, t VHOST_MESSAGE_HANDLER(VHOST_USER_SET_OWNER, vhost_user_set_owner, false, true) \ VHOST_MESSAGE_HANDLER(VHOST_USER_RESET_OWNER, vhost_user_reset_owner, false, false) \ VHOST_MESSAGE_HANDLER(VHOST_USER_SET_MEM_TABLE, vhost_user_set_mem_table, true, true) \ +VHOST_MESSAGE_HANDLER(VHOST_USER_GET_MAX_MEM_SLOTS, vhost_user_get_max_mem_slots, false, false) \ +VHOST_MESSAGE_HANDLER(VHOST_USER_ADD_MEM_REG, vhost_user_add_mem_reg, true, true) \ +VHOST_MESSAGE_HANDLER(VHOST_USER_REM_MEM_REG, vhost_user_rem_mem_reg, true, true) \ VHOST_MESSAGE_HANDLER(VHOST_USER_SET_LOG_BASE, vhost_user_set_log_base, true, true) \ VHOST_MESSAGE_HANDLER(VHOST_USER_SET_LOG_FD, vhost_user_set_log_fd, true, true) \ VHOST_MESSAGE_HANDLER(VHOST_USER_SET_VRING_NUM, vhost_user_set_vring_num, false, true) \ @@ -1516,7 +1519,6 @@ vhost_user_set_mem_table(struct virtio_net **pdev, struct virtio_net *dev = *pdev; struct VhostUserMemory *memory = &ctx->msg.payload.memory; struct rte_vhost_mem_region *reg; - int numa_node = SOCKET_ID_ANY; uint64_t mmap_offset; uint32_t i; bool async_notify = false; @@ -1561,39 +1563,13 @@ vhost_user_set_mem_table(struct virtio_net **pdev, if (dev->features & (1ULL << VIRTIO_F_IOMMU_PLATFORM)) vhost_user_iotlb_flush_all(dev); - free_mem_region(dev); + free_all_mem_regions(dev); rte_free(dev->mem); dev->mem = NULL; } - /* - * If VQ 0 has already been allocated, try to allocate on the same - * NUMA node. It can be reallocated later in numa_realloc(). - */ - if (dev->nr_vring > 0) - numa_node = dev->virtqueue[0]->numa_node; - - dev->nr_guest_pages = 0; - if (dev->guest_pages == NULL) { - dev->max_guest_pages = 8; - dev->guest_pages = rte_zmalloc_socket(NULL, - dev->max_guest_pages * - sizeof(struct guest_page), - RTE_CACHE_LINE_SIZE, - numa_node); - if (dev->guest_pages == NULL) { - VHOST_CONFIG_LOG(dev->ifname, ERR, - "failed to allocate memory for dev->guest_pages"); - goto close_msg_fds; - } - } - - dev->mem = rte_zmalloc_socket("vhost-mem-table", sizeof(struct rte_vhost_memory) + - sizeof(struct rte_vhost_mem_region) * memory->nregions, 0, numa_node); - if (dev->mem == NULL) { - VHOST_CONFIG_LOG(dev->ifname, ERR, "failed to allocate memory for dev->mem"); - goto free_guest_pages; - } + if (vhost_user_initialize_memory(pdev) < 0) + goto close_msg_fds; for (i = 0; i < memory->nregions; i++) { reg = &dev->mem->regions[i]; @@ -1657,11 +1633,9 @@ vhost_user_set_mem_table(struct virtio_net **pdev, return RTE_VHOST_MSG_RESULT_OK; free_mem_table: - free_mem_region(dev); + free_all_mem_regions(dev); rte_free(dev->mem); dev->mem = NULL; - -free_guest_pages: rte_free(dev->guest_pages); dev->guest_pages = NULL; close_msg_fds: @@ -1669,6 +1643,223 @@ vhost_user_set_mem_table(struct virtio_net **pdev, return RTE_VHOST_MSG_RESULT_ERR; } + +static int +vhost_user_get_max_mem_slots(struct virtio_net **pdev __rte_unused, + struct vhu_msg_context *ctx, + int main_fd __rte_unused) +{ + uint32_t max_mem_slots = VHOST_MEMORY_MAX_NREGIONS; + + ctx->msg.payload.u64 = (uint64_t)max_mem_slots; + ctx->msg.size = sizeof(ctx->msg.payload.u64); + ctx->fd_num = 0; + + return RTE_VHOST_MSG_RESULT_REPLY; +} + +static void +_dev_invalidate_vrings(struct virtio_net **pdev) +{ + struct virtio_net *dev = *pdev; + uint32_t i; + + for (i = 0; i < dev->nr_vring; i++) { + struct vhost_virtqueue *vq = dev->virtqueue[i]; + + if (!vq) + continue; + + if (vq->desc || vq->avail || vq->used) { + vq_assert_lock(dev, vq); + + /* + * If the memory table got updated, the ring addresses + * need to be translated again as virtual addresses have + * changed. + */ + vring_invalidate(dev, vq); + + translate_ring_addresses(&dev, &vq); + } + } + + *pdev = dev; +} + +/* + * Macro wrapper that performs the compile-time lock assertion with the + * correct message ID at the call site, then calls the implementation. + */ +#define dev_invalidate_vrings(pdev, id) do { \ + static_assert(id ## _LOCK_ALL_QPS, \ + #id " handler is not declared as locking all queue pairs"); \ + _dev_invalidate_vrings(pdev); \ +} while (0) + +static int +vhost_user_add_mem_reg(struct virtio_net **pdev, + struct vhu_msg_context *ctx, + int main_fd __rte_unused) +{ + uint32_t i; + struct virtio_net *dev = *pdev; + struct VhostUserMemoryRegion *region = &ctx->msg.payload.memory_single.region; + + /* convert first region add to normal memory table set */ + if (dev->mem == NULL) { + if (vhost_user_initialize_memory(pdev) < 0) + goto close_msg_fds; + } + + /* make sure new region will fit */ + if (dev->mem->nregions >= VHOST_MEMORY_MAX_NREGIONS) { + VHOST_CONFIG_LOG(dev->ifname, ERR, "too many memory regions already (%u)", + dev->mem->nregions); + goto close_msg_fds; + } + + /* make sure supplied memory fd present */ + if (ctx->fd_num != 1) { + VHOST_CONFIG_LOG(dev->ifname, ERR, "fd count makes no sense (%u)", ctx->fd_num); + goto close_msg_fds; + } + + /* Make sure no overlap in guest virtual address space */ + for (i = 0; i < dev->mem->nregions; i++) { + struct rte_vhost_mem_region *current_region = &dev->mem->regions[i]; + uint64_t current_region_guest_start = current_region->guest_user_addr; + uint64_t current_region_guest_end = current_region_guest_start + + current_region->size - 1; + uint64_t proposed_region_guest_start = region->userspace_addr; + uint64_t proposed_region_guest_end = proposed_region_guest_start + + region->memory_size - 1; + + if (!((proposed_region_guest_end < current_region_guest_start) || + (proposed_region_guest_start > current_region_guest_end))) { + VHOST_CONFIG_LOG(dev->ifname, ERR, + "requested memory region overlaps with another region"); + VHOST_CONFIG_LOG(dev->ifname, ERR, + "\tRequested region address:0x%" PRIx64, + region->userspace_addr); + VHOST_CONFIG_LOG(dev->ifname, ERR, + "\tRequested region size:0x%" PRIx64, + region->memory_size); + VHOST_CONFIG_LOG(dev->ifname, ERR, + "\tOverlapping region address:0x%" PRIx64, + current_region->guest_user_addr); + VHOST_CONFIG_LOG(dev->ifname, ERR, + "\tOverlapping region size:0x%" PRIx64, + current_region->size); + goto close_msg_fds; + } + } + + /* New region goes at the end of the contiguous array */ + struct rte_vhost_mem_region *reg = &dev->mem->regions[dev->mem->nregions]; + + reg->guest_phys_addr = region->guest_phys_addr; + reg->guest_user_addr = region->userspace_addr; + reg->size = region->memory_size; + reg->fd = ctx->fds[0]; + ctx->fds[0] = -1; + + if (vhost_user_mmap_region(dev, reg, region->mmap_offset) < 0) { + VHOST_CONFIG_LOG(dev->ifname, ERR, "failed to mmap region"); + close(reg->fd); + reg->fd = -1; + goto close_msg_fds; + } + + dev->mem->nregions++; + + if (dev->async_copy && rte_vfio_is_enabled("vfio")) { + if (async_dma_map_region(dev, reg, true) < 0) + goto free_new_region; + } + + if (dev->postcopy_listening) { + /* + * Cannot use vhost_user_postcopy_register() here because it + * reads ctx->msg.payload.memory (SET_MEM_TABLE layout), but + * ADD_MEM_REG uses the memory_single payload. Register the + * single new region directly instead. + */ + if (vhost_user_postcopy_region_register(dev, reg) < 0) + goto free_new_region; + } + + dev_invalidate_vrings(pdev, VHOST_USER_ADD_MEM_REG); + dev = *pdev; + dump_guest_pages(dev); + + return RTE_VHOST_MSG_RESULT_OK; + +free_new_region: + if (dev->async_copy && rte_vfio_is_enabled("vfio")) + async_dma_map_region(dev, reg, false); + remove_guest_pages(dev, reg); + free_mem_region(reg); + dev->mem->nregions--; +close_msg_fds: + close_msg_fds(ctx); + return RTE_VHOST_MSG_RESULT_ERR; +} + +static int +vhost_user_rem_mem_reg(struct virtio_net **pdev, + struct vhu_msg_context *ctx, + int main_fd __rte_unused) +{ + uint32_t i; + struct virtio_net *dev = *pdev; + struct VhostUserMemoryRegion *region = &ctx->msg.payload.memory_single.region; + + if (dev->mem == NULL || dev->mem->nregions == 0) { + VHOST_CONFIG_LOG(dev->ifname, ERR, "no memory regions to remove"); + close_msg_fds(ctx); + return RTE_VHOST_MSG_RESULT_ERR; + } + + for (i = 0; i < dev->mem->nregions; i++) { + struct rte_vhost_mem_region *current_region = &dev->mem->regions[i]; + + /* + * According to the vhost-user specification: + * The memory region to be removed is identified by its GPA, + * user address and size. The mmap offset is ignored. + */ + if (region->userspace_addr == current_region->guest_user_addr + && region->guest_phys_addr == current_region->guest_phys_addr + && region->memory_size == current_region->size) { + if (dev->async_copy && rte_vfio_is_enabled("vfio")) + async_dma_map_region(dev, current_region, false); + remove_guest_pages(dev, current_region); + dev_invalidate_vrings(pdev, VHOST_USER_REM_MEM_REG); + dev = *pdev; + free_mem_region(current_region); + + /* Compact the regions array to keep it contiguous */ + if (i < dev->mem->nregions - 1) { + memmove(&dev->mem->regions[i], + &dev->mem->regions[i + 1], + (dev->mem->nregions - 1 - i) * + sizeof(struct rte_vhost_mem_region)); + memset(&dev->mem->regions[dev->mem->nregions - 1], + 0, sizeof(struct rte_vhost_mem_region)); + } + + dev->mem->nregions--; + close_msg_fds(ctx); + return RTE_VHOST_MSG_RESULT_OK; + } + } + + VHOST_CONFIG_LOG(dev->ifname, ERR, "failed to find region"); + close_msg_fds(ctx); + return RTE_VHOST_MSG_RESULT_ERR; +} + static bool vq_is_ready(struct virtio_net *dev, struct vhost_virtqueue *vq) { -- 2.43.0
