From patchwork Tue Sep 12 03:00:05 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Cindy Lu X-Patchwork-Id: 13380604 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 50FA8CA0ECF for ; Tue, 12 Sep 2023 03:52:13 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S237561AbjILDwP (ORCPT ); Mon, 11 Sep 2023 23:52:15 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:50962 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S237570AbjILDwC (ORCPT ); Mon, 11 Sep 2023 23:52:02 -0400 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.129.124]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id 0B80E2913E for ; Mon, 11 Sep 2023 20:00:31 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1694487631; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=kwKuz+pEy562YxDwzJRjoqIMWX9vZPgr9ApgXLFv6FY=; b=DD9FMrBs+YSg16LGhq9HnLCP515/0eaJHuNOIvG4E1qYSbeX5o4RoJdM4N9upjKFEXSdTF A3GXdjBd6y/95u33Bj2b72usIE9azBOY2XizVzlLc9E19I4dgcTsnxHocHGZtXTBt6fWj2 INmWDu/hDIPllVuGKm/Ua5dxLKO4v58= Received: from mimecast-mx02.redhat.com (mx-ext.redhat.com [66.187.233.73]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-369-yWHp0cIoMQqnm9uiFbZKbQ-1; Mon, 11 Sep 2023 23:00:25 -0400 X-MC-Unique: yWHp0cIoMQqnm9uiFbZKbQ-1 Received: from smtp.corp.redhat.com (int-mx02.intmail.prod.int.rdu2.redhat.com [10.11.54.2]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id 7FB723C0D859; Tue, 12 Sep 2023 03:00:24 +0000 (UTC) Received: from server.redhat.com (unknown [10.72.112.22]) by smtp.corp.redhat.com (Postfix) with ESMTP id B456C40C6EA8; Tue, 12 Sep 2023 03:00:20 +0000 (UTC) From: Cindy Lu To: lulu@redhat.com, jasowang@redhat.com, mst@redhat.com, maxime.coquelin@redhat.com, xieyongji@bytedance.com, kvm@vger.kernel.org, linux-kernel@vger.kernel.org, virtualization@lists.linux-foundation.org, netdev@vger.kernel.org Cc: stable@vger.kernel.org Subject: [RFC v2 1/4] vduse: Add function to get/free the pages for reconnection Date: Tue, 12 Sep 2023 11:00:05 +0800 Message-Id: <20230912030008.3599514-2-lulu@redhat.com> In-Reply-To: <20230912030008.3599514-1-lulu@redhat.com> References: <20230912030008.3599514-1-lulu@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.1 on 10.11.54.2 Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org Add the function vduse_alloc_reconnnect_info_mem and vduse_alloc_reconnnect_info_mem In this 2 function, vduse will get/free (vq_num + 1)*page   Page 0 will be used to save the reconnection information, The Userspace App will maintain this. Page 1 ~ vq_num + 1 will save the reconnection information for vqs. Signed-off-by: Cindy Lu --- drivers/vdpa/vdpa_user/vduse_dev.c | 86 ++++++++++++++++++++++++++++++ 1 file changed, 86 insertions(+) diff --git a/drivers/vdpa/vdpa_user/vduse_dev.c b/drivers/vdpa/vdpa_user/vduse_dev.c index 26b7e29cb900..4c256fa31fc4 100644 --- a/drivers/vdpa/vdpa_user/vduse_dev.c +++ b/drivers/vdpa/vdpa_user/vduse_dev.c @@ -30,6 +30,10 @@ #include #include +#ifdef CONFIG_X86 +#include +#endif + #include "iova_domain.h" #define DRV_AUTHOR "Yongji Xie " @@ -41,6 +45,23 @@ #define VDUSE_IOVA_SIZE (128 * 1024 * 1024) #define VDUSE_MSG_DEFAULT_TIMEOUT 30 +/* struct vdpa_reconnect_info save the page information for reconnection + * kernel will init these information while alloc the pages + * and use these information to free the pages + */ +struct vdpa_reconnect_info { + /* Offset (within vm_file) in PAGE_SIZE, + * this just for check, not using + */ + u32 index; + /* physical address for this page*/ + phys_addr_t addr; + /* virtual address for this page*/ + unsigned long vaddr; + /* memory size, here always page_size*/ + phys_addr_t size; +}; + struct vduse_virtqueue { u16 index; u16 num_max; @@ -57,6 +78,7 @@ struct vduse_virtqueue { struct vdpa_callback cb; struct work_struct inject; struct work_struct kick; + struct vdpa_reconnect_info reconnect_info; }; struct vduse_dev; @@ -106,6 +128,7 @@ struct vduse_dev { u32 vq_align; struct vduse_umem *umem; struct mutex mem_lock; + struct vdpa_reconnect_info reconnect_status; }; struct vduse_dev_msg { @@ -1030,6 +1053,65 @@ static int vduse_dev_reg_umem(struct vduse_dev *dev, return ret; } +int vduse_alloc_reconnnect_info_mem(struct vduse_dev *dev) +{ + struct vdpa_reconnect_info *info; + struct vduse_virtqueue *vq; + void *addr; + + /*page 0 is use to save status,dpdk will use this to save the information + *needed in reconnection,kernel don't need to maintain this + */ + info = &dev->reconnect_status; + addr = (void *)get_zeroed_page(GFP_KERNEL); + if (!addr) + return -1; + + info->addr = virt_to_phys(addr); + info->vaddr = (unsigned long)(addr); + info->size = PAGE_SIZE; + /* index is vm Offset in PAGE_SIZE */ + info->index = 0; + + /*page 1~ vq_num + 1 save the reconnect info for vqs*/ + for (int i = 0; i < dev->vq_num + 1; i++) { + vq = &dev->vqs[i]; + info = &vq->reconnect_info; + addr = (void *)get_zeroed_page(GFP_KERNEL); + if (!addr) + return -1; + + info->addr = virt_to_phys(addr); + info->vaddr = (unsigned long)(addr); + info->size = PAGE_SIZE; + info->index = i + 1; + } + + return 0; +} + +int vduse_free_reconnnect_info_mem(struct vduse_dev *dev) +{ + struct vdpa_reconnect_info *info; + struct vduse_virtqueue *vq; + + info = &dev->reconnect_status; + free_page(info->vaddr); + info->size = 0; + info->addr = 0; + info->vaddr = 0; + for (int i = 0; i < dev->vq_num + 1; i++) { + vq = &dev->vqs[i]; + info = &vq->reconnect_info; + free_page(info->vaddr); + info->size = 0; + info->addr = 0; + info->vaddr = 0; + } + + return 0; +} + static long vduse_dev_ioctl(struct file *file, unsigned int cmd, unsigned long arg) { @@ -1390,6 +1472,8 @@ static int vduse_destroy_dev(char *name) mutex_unlock(&dev->lock); return -EBUSY; } + vduse_free_reconnnect_info_mem(dev); + dev->connected = true; mutex_unlock(&dev->lock); @@ -1542,6 +1626,8 @@ static int vduse_create_dev(struct vduse_dev_config *config, ret = PTR_ERR(dev->dev); goto err_dev; } + + vduse_alloc_reconnnect_info_mem(dev); __module_get(THIS_MODULE); return 0; From patchwork Tue Sep 12 03:00:06 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Cindy Lu X-Patchwork-Id: 13380602 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id EAF67CA0ED1 for ; Tue, 12 Sep 2023 03:24:50 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S236392AbjILDYx (ORCPT ); Mon, 11 Sep 2023 23:24:53 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:46000 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S237009AbjILDYc (ORCPT ); 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Mon, 11 Sep 2023 23:00:29 -0400 X-MC-Unique: LtaHkr5JNEGcRN0MMZ4H8w-1 Received: from smtp.corp.redhat.com (int-mx02.intmail.prod.int.rdu2.redhat.com [10.11.54.2]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id DE9F98A21EE; Tue, 12 Sep 2023 03:00:28 +0000 (UTC) Received: from server.redhat.com (unknown [10.72.112.22]) by smtp.corp.redhat.com (Postfix) with ESMTP id 1FDCB40C6EA8; Tue, 12 Sep 2023 03:00:24 +0000 (UTC) From: Cindy Lu To: lulu@redhat.com, jasowang@redhat.com, mst@redhat.com, maxime.coquelin@redhat.com, xieyongji@bytedance.com, kvm@vger.kernel.org, linux-kernel@vger.kernel.org, virtualization@lists.linux-foundation.org, netdev@vger.kernel.org Cc: stable@vger.kernel.org Subject: [RFC v2 2/4] vduse: Add file operation for mmap Date: Tue, 12 Sep 2023 11:00:06 +0800 Message-Id: <20230912030008.3599514-3-lulu@redhat.com> In-Reply-To: <20230912030008.3599514-1-lulu@redhat.com> References: <20230912030008.3599514-1-lulu@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.1 on 10.11.54.2 Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org Add the operation for mmap, The user space APP will use this function to map the pages to userspace Signed-off-by: Cindy Lu --- drivers/vdpa/vdpa_user/vduse_dev.c | 63 ++++++++++++++++++++++++++++++ 1 file changed, 63 insertions(+) diff --git a/drivers/vdpa/vdpa_user/vduse_dev.c b/drivers/vdpa/vdpa_user/vduse_dev.c index 4c256fa31fc4..2c69f4004a6e 100644 --- a/drivers/vdpa/vdpa_user/vduse_dev.c +++ b/drivers/vdpa/vdpa_user/vduse_dev.c @@ -1388,6 +1388,67 @@ static struct vduse_dev *vduse_dev_get_from_minor(int minor) return dev; } +static vm_fault_t vduse_vm_fault(struct vm_fault *vmf) +{ + struct vduse_dev *dev = vmf->vma->vm_file->private_data; + struct vm_area_struct *vma = vmf->vma; + u16 index = vma->vm_pgoff; + struct vduse_virtqueue *vq; + struct vdpa_reconnect_info *info; + + if (index == 0) { + info = &dev->reconnect_status; + } else { + vq = &dev->vqs[index - 1]; + info = &vq->reconnect_info; + } + vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot); + if (remap_pfn_range(vma, vmf->address & PAGE_MASK, PFN_DOWN(info->addr), + PAGE_SIZE, vma->vm_page_prot)) + return VM_FAULT_SIGBUS; + return VM_FAULT_NOPAGE; +} + +static const struct vm_operations_struct vduse_vm_ops = { + .fault = vduse_vm_fault, +}; + +static int vduse_dev_mmap(struct file *file, struct vm_area_struct *vma) +{ + struct vduse_dev *dev = file->private_data; + struct vdpa_reconnect_info *info; + unsigned long index = vma->vm_pgoff; + struct vduse_virtqueue *vq; + + if (vma->vm_end - vma->vm_start != PAGE_SIZE) + return -EINVAL; + if ((vma->vm_flags & VM_SHARED) == 0) + return -EINVAL; + + if (index > 65535) + return -EINVAL; + + if (index == 0) { + info = &dev->reconnect_status; + } else { + vq = &dev->vqs[index - 1]; + info = &vq->reconnect_info; + } + + if (info->index != index) + return -EINVAL; + + if (info->addr & (PAGE_SIZE - 1)) + return -EINVAL; + if (vma->vm_end - vma->vm_start != info->size) + return -EOPNOTSUPP; + + vm_flags_set(vma, VM_IO | VM_PFNMAP | VM_DONTDUMP); + vma->vm_ops = &vduse_vm_ops; + + return 0; +} + static int vduse_dev_open(struct inode *inode, struct file *file) { int ret; @@ -1420,6 +1481,8 @@ static const struct file_operations vduse_dev_fops = { .unlocked_ioctl = vduse_dev_ioctl, .compat_ioctl = compat_ptr_ioctl, .llseek = noop_llseek, + .mmap = vduse_dev_mmap, + }; static struct vduse_dev *vduse_dev_create(void) From patchwork Tue Sep 12 03:00:07 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Cindy Lu X-Patchwork-Id: 13380605 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id F172DCA0EC3 for ; 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Mon, 11 Sep 2023 23:00:33 -0400 X-MC-Unique: iLfAFYcYN1yjSWG1J-LD9A-1 Received: from smtp.corp.redhat.com (int-mx02.intmail.prod.int.rdu2.redhat.com [10.11.54.2]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id 4A7A93801BC2; Tue, 12 Sep 2023 03:00:33 +0000 (UTC) Received: from server.redhat.com (unknown [10.72.112.22]) by smtp.corp.redhat.com (Postfix) with ESMTP id 7EC5440C6EA8; Tue, 12 Sep 2023 03:00:29 +0000 (UTC) From: Cindy Lu To: lulu@redhat.com, jasowang@redhat.com, mst@redhat.com, maxime.coquelin@redhat.com, xieyongji@bytedance.com, kvm@vger.kernel.org, linux-kernel@vger.kernel.org, virtualization@lists.linux-foundation.org, netdev@vger.kernel.org Cc: stable@vger.kernel.org Subject: [RFC v2 3/4] vduse: update the vq_info in ioctl Date: Tue, 12 Sep 2023 11:00:07 +0800 Message-Id: <20230912030008.3599514-4-lulu@redhat.com> In-Reply-To: <20230912030008.3599514-1-lulu@redhat.com> References: <20230912030008.3599514-1-lulu@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.1 on 10.11.54.2 Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org In VDUSE_VQ_GET_INFO, the driver will sync the last_avail_idx with reconnect info, After mapping the reconnect pages to userspace The userspace App will update the reconnect_time in struct vhost_reconnect_vring, If this is not 0 then it means this vq is reconnected and will update the last_avail_idx Signed-off-by: Cindy Lu --- drivers/vdpa/vdpa_user/vduse_dev.c | 13 +++++++++++++ include/uapi/linux/vduse.h | 6 ++++++ 2 files changed, 19 insertions(+) diff --git a/drivers/vdpa/vdpa_user/vduse_dev.c b/drivers/vdpa/vdpa_user/vduse_dev.c index 2c69f4004a6e..680b23dbdde2 100644 --- a/drivers/vdpa/vdpa_user/vduse_dev.c +++ b/drivers/vdpa/vdpa_user/vduse_dev.c @@ -1221,6 +1221,8 @@ static long vduse_dev_ioctl(struct file *file, unsigned int cmd, struct vduse_vq_info vq_info; struct vduse_virtqueue *vq; u32 index; + struct vdpa_reconnect_info *area; + struct vhost_reconnect_vring *vq_reconnect; ret = -EFAULT; if (copy_from_user(&vq_info, argp, sizeof(vq_info))) @@ -1252,6 +1254,17 @@ static long vduse_dev_ioctl(struct file *file, unsigned int cmd, vq_info.ready = vq->ready; + area = &vq->reconnect_info; + + vq_reconnect = (struct vhost_reconnect_vring *)area->vaddr; + /*check if the vq is reconnect, if yes then update the last_avail_idx*/ + if ((vq_reconnect->last_avail_idx != + vq_info.split.avail_index) && + (vq_reconnect->reconnect_time != 0)) { + vq_info.split.avail_index = + vq_reconnect->last_avail_idx; + } + ret = -EFAULT; if (copy_to_user(argp, &vq_info, sizeof(vq_info))) break; diff --git a/include/uapi/linux/vduse.h b/include/uapi/linux/vduse.h index 11bd48c72c6c..d585425803fd 100644 --- a/include/uapi/linux/vduse.h +++ b/include/uapi/linux/vduse.h @@ -350,4 +350,10 @@ struct vduse_dev_response { }; }; +struct vhost_reconnect_vring { + __u16 reconnect_time; + __u16 last_avail_idx; + _Bool avail_wrap_counter; +}; + #endif /* _UAPI_VDUSE_H_ */ From patchwork Tue Sep 12 03:00:08 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Cindy Lu X-Patchwork-Id: 13380601 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 9AB30CA0ECD for ; Tue, 12 Sep 2023 03:24:49 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S236916AbjILDYw (ORCPT ); Mon, 11 Sep 2023 23:24:52 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:45166 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S236360AbjILDYc (ORCPT ); Mon, 11 Sep 2023 23:24:32 -0400 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.129.124]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id E6E912DA41 for ; 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Tue, 12 Sep 2023 03:00:59 +0000 (UTC) Received: from server.redhat.com (unknown [10.72.112.22]) by smtp.corp.redhat.com (Postfix) with ESMTP id 7725110005D4; Tue, 12 Sep 2023 03:00:55 +0000 (UTC) From: Cindy Lu To: lulu@redhat.com, jasowang@redhat.com, mst@redhat.com, maxime.coquelin@redhat.com, xieyongji@bytedance.com, kvm@vger.kernel.org, linux-kernel@vger.kernel.org, virtualization@lists.linux-foundation.org, netdev@vger.kernel.org Cc: stable@vger.kernel.org Subject: [RFC v2 4/4] vduse: Add new ioctl VDUSE_GET_RECONNECT_INFO Date: Tue, 12 Sep 2023 11:00:08 +0800 Message-Id: <20230912030008.3599514-5-lulu@redhat.com> In-Reply-To: <20230912030008.3599514-1-lulu@redhat.com> References: <20230912030008.3599514-1-lulu@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.1 on 10.11.54.3 Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org In VDUSE_GET_RECONNECT_INFO, the Userspace App can get the map size and The number of mapping memory pages from the kernel. The userspace App can use this information to map the pages. Signed-off-by: Cindy Lu --- drivers/vdpa/vdpa_user/vduse_dev.c | 15 +++++++++++++++ include/uapi/linux/vduse.h | 15 +++++++++++++++ 2 files changed, 30 insertions(+) diff --git a/drivers/vdpa/vdpa_user/vduse_dev.c b/drivers/vdpa/vdpa_user/vduse_dev.c index 680b23dbdde2..c99f99892b5c 100644 --- a/drivers/vdpa/vdpa_user/vduse_dev.c +++ b/drivers/vdpa/vdpa_user/vduse_dev.c @@ -1368,6 +1368,21 @@ static long vduse_dev_ioctl(struct file *file, unsigned int cmd, ret = 0; break; } + case VDUSE_GET_RECONNECT_INFO: { + struct vduse_reconnect_mmap_info info; + + ret = -EFAULT; + if (copy_from_user(&info, argp, sizeof(info))) + break; + + info.size = PAGE_SIZE; + info.max_index = dev->vq_num + 1; + + if (copy_to_user(argp, &info, sizeof(info))) + break; + ret = 0; + break; + } default: ret = -ENOIOCTLCMD; break; diff --git a/include/uapi/linux/vduse.h b/include/uapi/linux/vduse.h index d585425803fd..ce55e34f63d7 100644 --- a/include/uapi/linux/vduse.h +++ b/include/uapi/linux/vduse.h @@ -356,4 +356,19 @@ struct vhost_reconnect_vring { _Bool avail_wrap_counter; }; +/** + * struct vduse_reconnect_mmap_info + * @size: mapping memory size, always page_size here + * @max_index: the number of pages allocated in kernel,just + * use for check + */ + +struct vduse_reconnect_mmap_info { + __u32 size; + __u32 max_index; +}; + +#define VDUSE_GET_RECONNECT_INFO \ + _IOWR(VDUSE_BASE, 0x1b, struct vduse_reconnect_mmap_info) + #endif /* _UAPI_VDUSE_H_ */