From nobody Mon Feb 9 15:26:30 2026 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.129.124]) (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 2AAE41F946 for ; Wed, 7 Feb 2024 05:47:45 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=170.10.129.124 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1707284866; cv=none; b=qR+tGSuzlQ57Ri4pnicTRT3VYL480D1iGHlSt4nj4TkNY6ez1o10iYExUBXflWJKE2BhpCdMwdxRyM6mPfwQym22qGyPO69K5kBpBmRCq2gji7RQeIxjbwrOn6FUtk8/209m1ezaIzr1FUJ2X9XaoDCCE7Ewik2OSlFqTkrB0cM= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1707284866; c=relaxed/simple; bh=WXKHRU/uEj6cYAvi50bYRlcQ0ruywm7WIxvBv/gN2jw=; h=From:To:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=CZeWhJw8XReDTeEbaP8+N2HpvbCXoO3wGD6XVtUQW5kbw2lWdntRZiDcgzRinMUFk+d3DaFOgT1O0uXmvi6u6tAT49elpmHzYCEyQIFM3P+7s7gSTqP/owxAqOx1nsYvkCABI8NFCo77h5mwbJTRnzj0DHgczjKeXjYeSan6tvw= 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=KAVrWgRy; arc=none smtp.client-ip=170.10.129.124 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="KAVrWgRy" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1707284864; 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=dx4vuXIklQBxh8l06pvXMAeW4Cc8GkKcbpmXFc8So2o=; b=KAVrWgRyXEykUOLAu0jhOuMlhtYEoyN72bjR+qtPzV78S/o5F2ME3nlQLsELdK1X3hGnh1 0CARfeXjyCNflfs7JIwSDSFZtCgG6YKCa98T+LBZrb71UD6CNTAaO4qTsrcuy7xxL6sTde SIAKAZzXp2reaydwshFQ7GWtGfZNySQ= Received: from mimecast-mx02.redhat.com (mx-ext.redhat.com [66.187.233.73]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-499-5UgG03rVNwC6AlVylbb-5A-1; Wed, 07 Feb 2024 00:47:42 -0500 X-MC-Unique: 5UgG03rVNwC6AlVylbb-5A-1 Received: from smtp.corp.redhat.com (int-mx09.intmail.prod.int.rdu2.redhat.com [10.11.54.9]) (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 586DA3C0F247; Wed, 7 Feb 2024 05:47:42 +0000 (UTC) Received: from server.redhat.com (unknown [10.72.112.36]) by smtp.corp.redhat.com (Postfix) with ESMTP id CBF64492BC6; Wed, 7 Feb 2024 05:47:39 +0000 (UTC) From: Cindy Lu To: lulu@redhat.com, jasowang@redhat.com, mst@redhat.com, xieyongji@bytedance.com, linux-kernel@vger.kernel.org, maxime.coquelin@redhat.com Subject: [PATCH v4 4/5] vduse: Add file operation for mmap Date: Wed, 7 Feb 2024 13:43:31 +0800 Message-ID: <20240207054701.616094-5-lulu@redhat.com> In-Reply-To: <20240207054701.616094-1-lulu@redhat.com> References: <20240207054701.616094-1-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: quoted-printable X-Scanned-By: MIMEDefang 3.4.1 on 10.11.54.9 Content-Type: text/plain; charset="utf-8" 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/vd= use_dev.c index 2da659d5f4a8..083fe0047677 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(in= t minor) return dev; } =20 +static vm_fault_t vduse_vm_fault(struct vm_fault *vmf) +{ + struct vduse_dev *dev =3D vmf->vma->vm_file->private_data; + struct vm_area_struct *vma =3D vmf->vma; + u16 index =3D vma->vm_pgoff; + struct vduse_virtqueue *vq; + unsigned long vaddr; + + /* index 1+vq_number page reserved for virtqueue state*/ + vq =3D dev->vqs[index]; + vaddr =3D 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 =3D { + .fault =3D vduse_vm_fault, +}; + +static int vduse_dev_mmap(struct file *file, struct vm_area_struct *vma) +{ + struct vduse_dev *dev =3D file->private_data; + unsigned long vaddr =3D 0; + unsigned long index =3D vma->vm_pgoff; + struct vduse_virtqueue *vq; + + if (vma->vm_end - vma->vm_start !=3D PAGE_SIZE) + return -EINVAL; + if ((vma->vm_flags & VM_SHARED) =3D=3D 0) + return -EINVAL; + + if (index > dev->vq_num) + return -EINVAL; + + vq =3D dev->vqs[index]; + vaddr =3D vq->vdpa_reconnect_vaddr; + if (vaddr =3D=3D 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 !=3D PAGE_SIZE) + return -EOPNOTSUPP; + + vm_flags_set(vma, VM_DONTEXPAND); + vma->vm_ops =3D &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 = =3D { .unlocked_ioctl =3D vduse_dev_ioctl, .compat_ioctl =3D compat_ptr_ioctl, .llseek =3D noop_llseek, + .mmap =3D vduse_dev_mmap, + }; =20 static ssize_t irq_cb_affinity_show(struct vduse_virtqueue *vq, char *buf) --=20 2.43.0