From patchwork Tue Feb 27 07:10:05 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Zhoujian (jay)" X-Patchwork-Id: 878338 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=pass (mailfrom) smtp.mailfrom=nongnu.org (client-ip=2001:4830:134:3::11; helo=lists.gnu.org; envelope-from=qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org; receiver=) Authentication-Results: ozlabs.org; dmarc=none (p=none dis=none) header.from=huawei.com Received: from lists.gnu.org (lists.gnu.org [IPv6:2001:4830:134:3::11]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id 3zr8y26TZhz9s1x for ; Tue, 27 Feb 2018 18:11:38 +1100 (AEDT) Received: from localhost ([::1]:35201 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1eqZQG-0003PH-VH for incoming@patchwork.ozlabs.org; Tue, 27 Feb 2018 02:11:37 -0500 Received: from eggs.gnu.org ([2001:4830:134:3::10]:36589) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1eqZPa-0003O6-Qs for qemu-devel@nongnu.org; Tue, 27 Feb 2018 02:10:56 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1eqZPV-0006hf-SV for qemu-devel@nongnu.org; Tue, 27 Feb 2018 02:10:54 -0500 Received: from szxga05-in.huawei.com ([45.249.212.191]:2090 helo=huawei.com) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1eqZPV-0006fH-2Q for qemu-devel@nongnu.org; Tue, 27 Feb 2018 02:10:49 -0500 Received: from DGGEMS410-HUB.china.huawei.com (unknown [172.30.72.59]) by Forcepoint Email with ESMTP id 23356B0716348; Tue, 27 Feb 2018 15:10:34 +0800 (CST) Received: from localhost (10.177.19.14) by DGGEMS410-HUB.china.huawei.com (10.3.19.210) with Microsoft SMTP Server id 14.3.361.1; Tue, 27 Feb 2018 15:10:29 +0800 From: Jay Zhou To: Date: Tue, 27 Feb 2018 15:10:05 +0800 Message-ID: X-Mailer: git-send-email 2.6.1.windows.1 In-Reply-To: References: MIME-Version: 1.0 X-Originating-IP: [10.177.19.14] X-CFilter-Loop: Reflected X-detected-operating-system: by eggs.gnu.org: GNU/Linux 3.x [fuzzy] X-Received-From: 45.249.212.191 Subject: [Qemu-devel] [PATCH v8 2/2] vhost: used_memslots refactoring X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: weidong.huang@huawei.com, mst@redhat.com, wangxinxin.wang@huawei.com, arei.gonglei@huawei.com, jianjay.zhou@huawei.com, imammedo@redhat.com, liuzhe13@huawei.com Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: "Qemu-devel" Used_memslots is shared by vhost kernel and user, it is equal to dev->mem->nregions, which is correct for vhost kernel, but not for vhost user, the latter one uses memory regions that have file descriptor. E.g. a VM has a vhost-user NIC and 8(vhost user memslot upper limit) memory slots, it will be failed to hotplug a new DIMM device since vhost_has_free_slot() finds no free slot left. It should be successful if only part of memory slots have file descriptor, so setting used memslots for vhost-user and vhost-kernel respectively. Signed-off-by: Igor Mammedov Signed-off-by: Jay Zhou Signed-off-by: Liuzhe --- hw/virtio/vhost-backend.c | 15 +++++++- hw/virtio/vhost-user.c | 77 ++++++++++++++++++++++++++------------- hw/virtio/vhost.c | 13 +++---- include/hw/virtio/vhost-backend.h | 6 ++- 4 files changed, 75 insertions(+), 36 deletions(-) diff --git a/hw/virtio/vhost-backend.c b/hw/virtio/vhost-backend.c index 7f09efa..59def69 100644 --- a/hw/virtio/vhost-backend.c +++ b/hw/virtio/vhost-backend.c @@ -15,6 +15,8 @@ #include "hw/virtio/vhost-backend.h" #include "qemu/error-report.h" +static unsigned int vhost_kernel_used_memslots; + static int vhost_kernel_call(struct vhost_dev *dev, unsigned long int request, void *arg) { @@ -62,6 +64,11 @@ static int vhost_kernel_memslots_limit(struct vhost_dev *dev) return limit; } +static bool vhost_kernel_has_free_memslots(struct vhost_dev *dev) +{ + return vhost_kernel_used_memslots < vhost_kernel_memslots_limit(dev); +} + static int vhost_kernel_net_set_backend(struct vhost_dev *dev, struct vhost_vring_file *file) { @@ -233,11 +240,16 @@ static void vhost_kernel_set_iotlb_callback(struct vhost_dev *dev, qemu_set_fd_handler((uintptr_t)dev->opaque, NULL, NULL, NULL); } +static void vhost_kernel_set_used_memslots(struct vhost_dev *dev) +{ + vhost_kernel_used_memslots = dev->mem->nregions; +} + static const VhostOps kernel_ops = { .backend_type = VHOST_BACKEND_TYPE_KERNEL, .vhost_backend_init = vhost_kernel_init, .vhost_backend_cleanup = vhost_kernel_cleanup, - .vhost_backend_memslots_limit = vhost_kernel_memslots_limit, + .vhost_backend_has_free_memslots = vhost_kernel_has_free_memslots, .vhost_net_set_backend = vhost_kernel_net_set_backend, .vhost_scsi_set_endpoint = vhost_kernel_scsi_set_endpoint, .vhost_scsi_clear_endpoint = vhost_kernel_scsi_clear_endpoint, @@ -264,6 +276,7 @@ static const VhostOps kernel_ops = { #endif /* CONFIG_VHOST_VSOCK */ .vhost_set_iotlb_callback = vhost_kernel_set_iotlb_callback, .vhost_send_device_iotlb_msg = vhost_kernel_send_device_iotlb_msg, + .vhost_set_used_memslots = vhost_kernel_set_used_memslots, }; int vhost_set_backend_type(struct vhost_dev *dev, VhostBackendType backend_type) diff --git a/hw/virtio/vhost-user.c b/hw/virtio/vhost-user.c index 6eb9798..f732c80 100644 --- a/hw/virtio/vhost-user.c +++ b/hw/virtio/vhost-user.c @@ -147,6 +147,8 @@ static VhostUserMsg m __attribute__ ((unused)); /* The version of the protocol we support */ #define VHOST_USER_VERSION (0x1) +static bool vhost_user_free_memslots = true; + struct vhost_user { CharBackend *chr; int slave_fd; @@ -314,12 +316,43 @@ static int vhost_user_set_log_base(struct vhost_dev *dev, uint64_t base, return 0; } +static int vhost_user_prepare_msg(struct vhost_dev *dev, VhostUserMemory *mem, + int *fds) +{ + int i, fd; + + vhost_user_free_memslots = true; + for (i = 0, mem->nregions = 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) { + if (mem->nregions == VHOST_MEMORY_MAX_NREGIONS) { + vhost_user_free_memslots = false; + return -1; + } + + mem->regions[mem->nregions].userspace_addr = reg->userspace_addr; + mem->regions[mem->nregions].memory_size = reg->memory_size; + mem->regions[mem->nregions].guest_phys_addr = reg->guest_phys_addr; + mem->regions[mem->nregions].mmap_offset = offset; + fds[mem->nregions++] = fd; + } + } + + 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; + size_t fd_num; bool reply_supported = virtio_has_feature(dev->protocol_features, VHOST_USER_PROTOCOL_F_REPLY_ACK); @@ -332,29 +365,12 @@ static int vhost_user_set_mem_table(struct vhost_dev *dev, msg.hdr.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) { - if (fd_num == VHOST_MEMORY_MAX_NREGIONS) { - error_report("Failed preparing vhost-user memory table msg"); - return -1; - } - 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; - fds[fd_num++] = fd; - } + if (vhost_user_prepare_msg(dev, &msg.payload.memory, fds) < 0) { + error_report("Failed preparing vhost-user memory table msg"); + return -1; } - msg.payload.memory.nregions = fd_num; + fd_num = msg.payload.memory.nregions; if (!fd_num) { error_report("Failed initializing vhost-user memory map, " @@ -870,9 +886,9 @@ static int vhost_user_get_vq_index(struct vhost_dev *dev, int idx) return idx; } -static int vhost_user_memslots_limit(struct vhost_dev *dev) +static bool vhost_user_has_free_memslots(struct vhost_dev *dev) { - return VHOST_MEMORY_MAX_NREGIONS; + return vhost_user_free_memslots; } static bool vhost_user_requires_shm_log(struct vhost_dev *dev) @@ -1054,11 +1070,19 @@ static int vhost_user_set_config(struct vhost_dev *dev, const uint8_t *data, return 0; } +static void vhost_user_set_used_memslots(struct vhost_dev *dev) +{ + int fds[VHOST_MEMORY_MAX_NREGIONS]; + VhostUserMsg msg; + + vhost_user_prepare_msg(dev, &msg.payload.memory, fds); +} + const VhostOps user_ops = { .backend_type = VHOST_BACKEND_TYPE_USER, .vhost_backend_init = vhost_user_init, .vhost_backend_cleanup = vhost_user_cleanup, - .vhost_backend_memslots_limit = vhost_user_memslots_limit, + .vhost_backend_has_free_memslots = vhost_user_has_free_memslots, .vhost_set_log_base = vhost_user_set_log_base, .vhost_set_mem_table = vhost_user_set_mem_table, .vhost_set_vring_addr = vhost_user_set_vring_addr, @@ -1082,4 +1106,5 @@ const VhostOps user_ops = { .vhost_send_device_iotlb_msg = vhost_user_send_device_iotlb_msg, .vhost_get_config = vhost_user_get_config, .vhost_set_config = vhost_user_set_config, + .vhost_set_used_memslots = vhost_user_set_used_memslots, }; diff --git a/hw/virtio/vhost.c b/hw/virtio/vhost.c index 4a583a3..7f17de9 100644 --- a/hw/virtio/vhost.c +++ b/hw/virtio/vhost.c @@ -44,20 +44,19 @@ static struct vhost_log *vhost_log; static struct vhost_log *vhost_log_shm; -static unsigned int used_memslots; static QLIST_HEAD(, vhost_dev) vhost_devices = QLIST_HEAD_INITIALIZER(vhost_devices); bool vhost_has_free_slot(void) { - unsigned int slots_limit = ~0U; struct vhost_dev *hdev; QLIST_FOREACH(hdev, &vhost_devices, entry) { - unsigned int r = hdev->vhost_ops->vhost_backend_memslots_limit(hdev); - slots_limit = MIN(slots_limit, r); + if (!hdev->vhost_ops->vhost_backend_has_free_memslots(hdev)) { + return false; + } } - return slots_limit > used_memslots; + return true; } static void vhost_dev_sync_region(struct vhost_dev *dev, @@ -442,7 +441,7 @@ static void vhost_commit(MemoryListener *listener) dev->n_mem_sections * sizeof dev->mem->regions[0]; dev->mem = g_realloc(dev->mem, regions_size); dev->mem->nregions = dev->n_mem_sections; - used_memslots = dev->mem->nregions; + dev->vhost_ops->vhost_set_used_memslots(dev); for (i = 0; i < dev->n_mem_sections; i++) { struct vhost_memory_region *cur_vmr = dev->mem->regions + i; struct MemoryRegionSection *mrs = dev->mem_sections + i; @@ -1186,7 +1185,7 @@ int vhost_dev_init(struct vhost_dev *hdev, void *opaque, memory_listener_register(&hdev->memory_listener, &address_space_memory); QLIST_INSERT_HEAD(&vhost_devices, hdev, entry); - if (used_memslots > hdev->vhost_ops->vhost_backend_memslots_limit(hdev)) { + if (!hdev->vhost_ops->vhost_backend_has_free_memslots(hdev)) { error_report("vhost backend memory slots limit is less" " than current number of present memory slots"); r = -1; diff --git a/include/hw/virtio/vhost-backend.h b/include/hw/virtio/vhost-backend.h index 592254f..2eac224 100644 --- a/include/hw/virtio/vhost-backend.h +++ b/include/hw/virtio/vhost-backend.h @@ -36,7 +36,7 @@ struct vhost_iotlb_msg; typedef int (*vhost_backend_init)(struct vhost_dev *dev, void *opaque); typedef int (*vhost_backend_cleanup)(struct vhost_dev *dev); -typedef int (*vhost_backend_memslots_limit)(struct vhost_dev *dev); +typedef bool (*vhost_backend_has_free_memslots)(struct vhost_dev *dev); typedef int (*vhost_net_set_backend_op)(struct vhost_dev *dev, struct vhost_vring_file *file); @@ -94,12 +94,13 @@ typedef int (*vhost_set_config_op)(struct vhost_dev *dev, const uint8_t *data, uint32_t flags); typedef int (*vhost_get_config_op)(struct vhost_dev *dev, uint8_t *config, uint32_t config_len); +typedef void (*vhost_set_used_memslots_op)(struct vhost_dev *dev); typedef struct VhostOps { VhostBackendType backend_type; vhost_backend_init vhost_backend_init; vhost_backend_cleanup vhost_backend_cleanup; - vhost_backend_memslots_limit vhost_backend_memslots_limit; + vhost_backend_has_free_memslots vhost_backend_has_free_memslots; vhost_net_set_backend_op vhost_net_set_backend; vhost_net_set_mtu_op vhost_net_set_mtu; vhost_scsi_set_endpoint_op vhost_scsi_set_endpoint; @@ -130,6 +131,7 @@ typedef struct VhostOps { vhost_send_device_iotlb_msg_op vhost_send_device_iotlb_msg; vhost_get_config_op vhost_get_config; vhost_set_config_op vhost_set_config; + vhost_set_used_memslots_op vhost_set_used_memslots; } VhostOps; extern const VhostOps user_ops;