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: 13380577 Received: from lindbergh.monkeyblade.net (lindbergh.monkeyblade.net [23.128.96.19]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id D225414269 for ; Tue, 12 Sep 2023 03:00:34 +0000 (UTC) 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 32BC4296C5 for ; Mon, 11 Sep 2023 20:00:34 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1694487633; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=RvcAHd1Sx6r1hbCkmerjsL+BU6ZA4iisCRaqRkbDPg0=; b=UAiwLbvybP/AeV7VlxpoGZ19dMjezIetC9OtkxuD5FioILqGbWI5/G6dV9ekgC6acZk1MS oM1GbRe3TJD+JuL3e0hhoSEeMmx8j8BsC9qVb416jYtqnWg8+g8JoonVORS5UT1R+N830t X+PGHVYsObqYMkcgOeM0trOu5HmOLPw= Received: from mimecast-mx02.redhat.com (mimecast-mx02.redhat.com [66.187.233.88]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-151-LtaHkr5JNEGcRN0MMZ4H8w-1; 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> Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.1 on 10.11.54.2 X-Patchwork-State: RFC 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)