From patchwork Mon Mar 26 13:41:00 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Zhoujian (jay)" X-Patchwork-Id: 10307869 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 97527600F6 for ; Mon, 26 Mar 2018 13:55:40 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 81A41296F9 for ; Mon, 26 Mar 2018 13:55:40 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 75D93296FC; Mon, 26 Mar 2018 13:55:40 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.9 required=2.0 tests=BAYES_00,RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from lists.gnu.org (lists.gnu.org [208.118.235.17]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id 91FD6296F9 for ; Mon, 26 Mar 2018 13:55:39 +0000 (UTC) Received: from localhost ([::1]:56912 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1f0Sb4-0005tk-To for patchwork-qemu-devel@patchwork.kernel.org; Mon, 26 Mar 2018 09:55:38 -0400 Received: from eggs.gnu.org ([2001:4830:134:3::10]:58774) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1f0SNq-0002v2-75 for qemu-devel@nongnu.org; Mon, 26 Mar 2018 09:41:59 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1f0SNm-0001VG-5d for qemu-devel@nongnu.org; Mon, 26 Mar 2018 09:41:58 -0400 Received: from [45.249.212.32] (port=45396 helo=huawei.com) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1f0SNl-0001RV-Ax for qemu-devel@nongnu.org; Mon, 26 Mar 2018 09:41:54 -0400 Received: from DGGEMS401-HUB.china.huawei.com (unknown [172.30.72.59]) by Forcepoint Email with ESMTP id 8134F25103761; Mon, 26 Mar 2018 21:41:45 +0800 (CST) Received: from localhost (10.177.19.14) by DGGEMS401-HUB.china.huawei.com (10.3.19.201) with Microsoft SMTP Server id 14.3.361.1; Mon, 26 Mar 2018 21:41:40 +0800 From: Jay Zhou To: Date: Mon, 26 Mar 2018 21:41:00 +0800 Message-ID: <1522071660-22252-1-git-send-email-jianjay.zhou@huawei.com> X-Mailer: git-send-email 2.6.1.windows.1 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: 45.249.212.32 Subject: [Qemu-devel] [PATCH v10] 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+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Sender: "Qemu-devel" X-Virus-Scanned: ClamAV using ClamSMTP 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 --- v10: - fix misaligned access to structures - refine on setting used_memslots for vhost-user to avoid side effect v7 ... v9: - rebased on the master v2 ... v6: - delete the "used_memslots" global variable, and add it for vhost-user and vhost-kernel separately - refine the function, commit log - used_memslots refactoring hw/virtio/vhost-backend.c | 15 ++++++++++++++- hw/virtio/vhost-user.c | 30 +++++++++++++++++++++++++++--- hw/virtio/vhost.c | 13 ++++++------- include/hw/virtio/vhost-backend.h | 6 ++++-- 4 files changed, 51 insertions(+), 13 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 44aea5c..b9879ca 100644 --- a/hw/virtio/vhost-user.c +++ b/hw/virtio/vhost-user.c @@ -170,6 +170,8 @@ static VhostUserMsg m __attribute__ ((unused)); /* The version of the protocol we support */ #define VHOST_USER_VERSION (0x1) +static int vhost_user_used_memslots; + struct vhost_user { struct vhost_dev *dev; CharBackend *chr; @@ -1289,9 +1291,9 @@ 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_used_memslots < VHOST_MEMORY_MAX_NREGIONS; } static bool vhost_user_requires_shm_log(struct vhost_dev *dev) @@ -1559,11 +1561,32 @@ vhost_user_crypto_close_session(struct vhost_dev *dev, uint64_t session_id) return 0; } +static void vhost_user_set_used_memslots(struct vhost_dev *dev) +{ + int i, fd; + int fd_num = 0; + + 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) { + fd_num++; + } + } + vhost_user_used_memslots = fd_num; +} + 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, @@ -1589,4 +1612,5 @@ const VhostOps user_ops = { .vhost_set_config = vhost_user_set_config, .vhost_crypto_create_session = vhost_user_crypto_create_session, .vhost_crypto_close_session = vhost_user_crypto_close_session, + .vhost_set_used_memslots = vhost_user_set_used_memslots, }; diff --git a/hw/virtio/vhost.c b/hw/virtio/vhost.c index 250f886..5bd4081 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, @@ -446,7 +445,6 @@ 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; 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; @@ -458,6 +456,7 @@ static void vhost_commit(MemoryListener *listener) mrs->offset_within_region; cur_vmr->flags_padding = 0; } + dev->vhost_ops->vhost_set_used_memslots(dev); if (!dev->started) { goto out; @@ -1248,7 +1247,7 @@ 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 5dac61f..b604521 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); @@ -100,12 +100,13 @@ typedef int (*vhost_crypto_create_session_op)(struct vhost_dev *dev, uint64_t *session_id); typedef int (*vhost_crypto_close_session_op)(struct vhost_dev *dev, uint64_t session_id); +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; @@ -138,6 +139,7 @@ typedef struct VhostOps { vhost_set_config_op vhost_set_config; vhost_crypto_create_session_op vhost_crypto_create_session; vhost_crypto_close_session_op vhost_crypto_close_session; + vhost_set_used_memslots_op vhost_set_used_memslots; } VhostOps; extern const VhostOps user_ops;