From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) (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 C822A824A9 for ; Fri, 12 Apr 2024 13:31:28 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=170.10.133.124 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1712928690; cv=none; b=NV3V1tqr8zNV/zBGCnE4wlCFQ7OyEe4JYYSJowgPngiJ1t19QKgKJIBoYSfisNv3Wwi6USl4pyOqX2aAU2vANhOX8KoOr78/SjmnmXS7ZcYNhSzzWiHFmF3AFumXnpWPc08SbyC8G9QKK+HsD2pEjna6qC5UK0LU1qBoJiRo3Us= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1712928690; c=relaxed/simple; bh=bKN8UQ9NS8z8CGfSU2og9P/q9mfucOox+qnqy3HOHbs=; h=From:To:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=IjqoMaSLl2vz4HxUQ1ZUnxej1EDgq9MKu6V5eK8CSD9TksB+HKWSDQlJwte9boVGqOqRDgW3I9mJ/8+ITg2QWCJP2Kt8ZevaxGCsF1AAa8Nud3Ew8S+/zUJTYG971c6d5vXjmbPnob3UI413tvzLLMLNjH0y5+ZfmGl2BmaigJc= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=redhat.com; spf=pass smtp.mailfrom=redhat.com; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b=g4LChcae; arc=none smtp.client-ip=170.10.133.124 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=redhat.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=redhat.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="g4LChcae" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1712928687; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=35sWc1yIwO6N5kVcpws/O6LKONaL5+Jtm0fcsW8kNnY=; b=g4LChcaeHUQmXlrds4ho8WCSxAu99al0QyKmxK1BKW+yE2QTgcEx+BW50GdSo2tr3NMpRU 55woQAxJMxYjJwQVXiC6U3wGLU1FGXdw6yLruHjiNBTw9X7yMkH2sbaXtxkTzjud0ErqF2 V3ZhItY4FmeqVI2SAg38OTsnRbsMDTg= Received: from mimecast-mx02.redhat.com (mimecast-mx02.redhat.com [66.187.233.88]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-338-r1p6kOVmNpGuT-qX4K-ScA-1; Fri, 12 Apr 2024 09:31:26 -0400 X-MC-Unique: r1p6kOVmNpGuT-qX4K-ScA-1 Received: from smtp.corp.redhat.com (int-mx05.intmail.prod.int.rdu2.redhat.com [10.11.54.5]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id 0643B80A1B9; Fri, 12 Apr 2024 13:31:26 +0000 (UTC) Received: from server.redhat.com (unknown [10.72.112.22]) by smtp.corp.redhat.com (Postfix) with ESMTP id A25CC10E4B; Fri, 12 Apr 2024 13:31:23 +0000 (UTC) From: Cindy Lu To: lulu@redhat.com, jasowang@redhat.com, mst@redhat.com, linux-kernel@vger.kernel.org, virtualization@lists.linux-foundation.org Subject: [PATCH v5 4/5] vduse: Add file operation for mmap Date: Fri, 12 Apr 2024 21:28:24 +0800 Message-ID: <20240412133017.483407-5-lulu@redhat.com> In-Reply-To: <20240412133017.483407-1-lulu@redhat.com> References: <20240412133017.483407-1-lulu@redhat.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Scanned-By: MIMEDefang 3.4.1 on 10.11.54.5 Add the operation for mmap, This function will be used by the user space application to map the pages to the user space. Signed-off-by: Cindy Lu --- drivers/vdpa/vdpa_user/vduse_dev.c | 57 ++++++++++++++++++++++++++++++ 1 file changed, 57 insertions(+) diff --git a/drivers/vdpa/vdpa_user/vduse_dev.c b/drivers/vdpa/vdpa_user/vduse_dev.c index 2da659d5f4a8..7abe0c17cf0e 100644 --- a/drivers/vdpa/vdpa_user/vduse_dev.c +++ b/drivers/vdpa/vdpa_user/vduse_dev.c @@ -1465,6 +1465,61 @@ 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; + unsigned long vaddr; + + /* index 0~vq_number-1 page reserved for virtqueue state*/ + vq = dev->vqs[index]; + vaddr = vq->vdpa_reconnect_vaddr; + if (remap_pfn_range(vma, vmf->address & PAGE_MASK, + PFN_DOWN(virt_to_phys((void *)vaddr)), 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; + unsigned long vaddr = 0; + 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 >= dev->vq_num) + return -EINVAL; + + index = array_index_nospec(index, dev->vq_num); + vq = dev->vqs[index]; + vaddr = vq->vdpa_reconnect_vaddr; + if (vaddr == 0) + return -EOPNOTSUPP; + + if (virt_to_phys((void *)vaddr) & (PAGE_SIZE - 1)) + return -EINVAL; + + /* Check if the Userspace App mapped the correct size */ + if (vma->vm_end - vma->vm_start != PAGE_SIZE) + return -EOPNOTSUPP; + + vm_flags_set(vma, VM_DONTEXPAND); + vma->vm_ops = &vduse_vm_ops; + + return 0; +} + static int vduse_dev_open(struct inode *inode, struct file *file) { int ret; @@ -1497,6 +1552,8 @@ 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 ssize_t irq_cb_affinity_show(struct vduse_virtqueue *vq, char *buf) -- 2.43.0