From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-2.4 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS,UNPARSEABLE_RELAY,USER_AGENT_SANE_1 autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 106B3CA9EC9 for ; Mon, 4 Nov 2019 22:15:49 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id CA37820848 for ; Mon, 4 Nov 2019 22:15:48 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=oracle.com header.i=@oracle.com header.b="DGjeC4m3" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2389836AbfKDWF2 (ORCPT ); Mon, 4 Nov 2019 17:05:28 -0500 Received: from userp2130.oracle.com ([156.151.31.86]:59980 "EHLO userp2130.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2389835AbfKDWF1 (ORCPT ); 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Mon, 04 Nov 2019 22:00:20 +0000 Received: from pps.filterd (userp3020.oracle.com [127.0.0.1]) by userp3020.oracle.com (8.16.0.27/8.16.0.27) with SMTP id xA4LwkwY160596; Mon, 4 Nov 2019 22:00:20 GMT Received: from aserv0121.oracle.com (aserv0121.oracle.com [141.146.126.235]) by userp3020.oracle.com with ESMTP id 2w1kxe1urs-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Mon, 04 Nov 2019 22:00:19 +0000 Received: from abhmp0006.oracle.com (abhmp0006.oracle.com [141.146.116.12]) by aserv0121.oracle.com (8.14.4/8.13.8) with ESMTP id xA4M0EgW022742; Mon, 4 Nov 2019 22:00:14 GMT Received: from bostrovs-us.us.oracle.com (/10.152.32.65) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Mon, 04 Nov 2019 14:00:13 -0800 Subject: Re: [PATCH v2 09/15] xen/gntdev: use mmu_range_notifier_insert To: Jason Gunthorpe , linux-mm@kvack.org, Jerome Glisse , Ralph Campbell , John Hubbard , Felix.Kuehling@amd.com Cc: linux-rdma@vger.kernel.org, dri-devel@lists.freedesktop.org, amd-gfx@lists.freedesktop.org, Alex Deucher , Ben Skeggs , =?UTF-8?Q?Christian_K=c3=b6nig?= , David Zhou , Dennis Dalessandro , Juergen Gross , Mike Marciniszyn , Oleksandr Andrushchenko , Petr Cvek , Stefano Stabellini , nouveau@lists.freedesktop.org, xen-devel@lists.xenproject.org, Christoph Hellwig , Jason Gunthorpe References: <20191028201032.6352-1-jgg@ziepe.ca> <20191028201032.6352-10-jgg@ziepe.ca> From: Boris Ostrovsky Autocrypt: addr=boris.ostrovsky@oracle.com; 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Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.1.1 MIME-Version: 1.0 In-Reply-To: <20191028201032.6352-10-jgg@ziepe.ca> Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit Content-Language: en-US X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9431 signatures=668685 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 suspectscore=0 malwarescore=0 phishscore=0 bulkscore=0 spamscore=0 mlxscore=0 mlxlogscore=999 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1908290000 definitions=main-1911040210 X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9431 signatures=668685 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 priorityscore=1501 malwarescore=0 suspectscore=0 phishscore=0 bulkscore=0 spamscore=0 clxscore=1015 lowpriorityscore=0 mlxscore=0 impostorscore=0 mlxlogscore=999 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1908290000 definitions=main-1911040210 Sender: linux-rdma-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-rdma@vger.kernel.org On 10/28/19 4:10 PM, Jason Gunthorpe wrote: > @@ -445,17 +438,9 @@ static void gntdev_vma_close(struct vm_area_struct *vma) > struct gntdev_priv *priv = file->private_data; > > pr_debug("gntdev_vma_close %p\n", vma); > - if (use_ptemod) { > - /* It is possible that an mmu notifier could be running > - * concurrently, so take priv->lock to ensure that the vma won't > - * vanishing during the unmap_grant_pages call, since we will > - * spin here until that completes. Such a concurrent call will > - * not do any unmapping, since that has been done prior to > - * closing the vma, but it may still iterate the unmap_ops list. > - */ > - mutex_lock(&priv->lock); > + if (use_ptemod && map->vma == vma) { Is it possible for map->vma not to be equal to vma? -boris > + mmu_range_notifier_remove(&map->notifier); > map->vma = NULL; > - mutex_unlock(&priv->lock); > } > vma->vm_private_data = NULL; > gntdev_put_map(priv, map); > From mboxrd@z Thu Jan 1 00:00:00 1970 From: Boris Ostrovsky Subject: Re: [PATCH v2 09/15] xen/gntdev: use mmu_range_notifier_insert Date: Mon, 4 Nov 2019 17:03:31 -0500 Message-ID: <3938b588-c6c5-3bd1-8ea9-47e4d5b2045c@oracle.com> References: <20191028201032.6352-1-jgg@ziepe.ca> <20191028201032.6352-10-jgg@ziepe.ca> Mime-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Return-path: In-Reply-To: <20191028201032.6352-10-jgg@ziepe.ca> Content-Language: en-US List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: xen-devel-bounces@lists.xenproject.org Sender: "Xen-devel" To: Jason Gunthorpe , linux-mm@kvack.org, Jerome Glisse , Ralph Campbell , John Hubbard , Felix.Kuehling@amd.com Cc: Juergen Gross , David Zhou , Mike Marciniszyn , Stefano Stabellini , Oleksandr Andrushchenko , linux-rdma@vger.kernel.org, nouveau@lists.freedesktop.org, Dennis Dalessandro , amd-gfx@lists.freedesktop.org, Christoph Hellwig , Jason Gunthorpe , dri-devel@lists.freedesktop.org, Alex Deucher , xen-devel@lists.xenproject.org, Petr Cvek , =?UTF-8?Q?Christian_K=c3=b6nig?= , Ben Skeggs List-Id: nouveau.vger.kernel.org T24gMTAvMjgvMTkgNDoxMCBQTSwgSmFzb24gR3VudGhvcnBlIHdyb3RlOgo+IEBAIC00NDUsMTcg KzQzOCw5IEBAIHN0YXRpYyB2b2lkIGdudGRldl92bWFfY2xvc2Uoc3RydWN0IHZtX2FyZWFfc3Ry dWN0ICp2bWEpCj4gIAlzdHJ1Y3QgZ250ZGV2X3ByaXYgKnByaXYgPSBmaWxlLT5wcml2YXRlX2Rh dGE7Cj4gIAo+ICAJcHJfZGVidWcoImdudGRldl92bWFfY2xvc2UgJXBcbiIsIHZtYSk7Cj4gLQlp ZiAodXNlX3B0ZW1vZCkgewo+IC0JCS8qIEl0IGlzIHBvc3NpYmxlIHRoYXQgYW4gbW11IG5vdGlm aWVyIGNvdWxkIGJlIHJ1bm5pbmcKPiAtCQkgKiBjb25jdXJyZW50bHksIHNvIHRha2UgcHJpdi0+ bG9jayB0byBlbnN1cmUgdGhhdCB0aGUgdm1hIHdvbid0Cj4gLQkJICogdmFuaXNoaW5nIGR1cmlu ZyB0aGUgdW5tYXBfZ3JhbnRfcGFnZXMgY2FsbCwgc2luY2Ugd2Ugd2lsbAo+IC0JCSAqIHNwaW4g aGVyZSB1bnRpbCB0aGF0IGNvbXBsZXRlcy4gU3VjaCBhIGNvbmN1cnJlbnQgY2FsbCB3aWxsCj4g LQkJICogbm90IGRvIGFueSB1bm1hcHBpbmcsIHNpbmNlIHRoYXQgaGFzIGJlZW4gZG9uZSBwcmlv ciB0bwo+IC0JCSAqIGNsb3NpbmcgdGhlIHZtYSwgYnV0IGl0IG1heSBzdGlsbCBpdGVyYXRlIHRo ZSB1bm1hcF9vcHMgbGlzdC4KPiAtCQkgKi8KPiAtCQltdXRleF9sb2NrKCZwcml2LT5sb2NrKTsK PiArCWlmICh1c2VfcHRlbW9kICYmIG1hcC0+dm1hID09IHZtYSkgewoKCklzIGl0IHBvc3NpYmxl IGZvciBtYXAtPnZtYSBub3QgdG8gYmUgZXF1YWwgdG8gdm1hPwoKLWJvcmlzCgoKPiArCQltbXVf cmFuZ2Vfbm90aWZpZXJfcmVtb3ZlKCZtYXAtPm5vdGlmaWVyKTsKPiAgCQltYXAtPnZtYSA9IE5V TEw7Cj4gLQkJbXV0ZXhfdW5sb2NrKCZwcml2LT5sb2NrKTsKPiAgCX0KPiAgCXZtYS0+dm1fcHJp dmF0ZV9kYXRhID0gTlVMTDsKPiAgCWdudGRldl9wdXRfbWFwKHByaXYsIG1hcCk7Cj4KCgpfX19f X19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fXwpYZW4tZGV2ZWwgbWFp bGluZyBsaXN0Clhlbi1kZXZlbEBsaXN0cy54ZW5wcm9qZWN0Lm9yZwpodHRwczovL2xpc3RzLnhl bnByb2plY3Qub3JnL21haWxtYW4vbGlzdGluZm8veGVuLWRldmVs From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-2.0 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, UNPARSEABLE_RELAY,USER_AGENT_SANE_1 autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 23563CA9EC9 for ; 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Mon, 04 Nov 2019 22:00:20 +0000 Received: from pps.filterd (userp3020.oracle.com [127.0.0.1]) by userp3020.oracle.com (8.16.0.27/8.16.0.27) with SMTP id xA4LwkwY160596; Mon, 4 Nov 2019 22:00:20 GMT Received: from aserv0121.oracle.com (aserv0121.oracle.com [141.146.126.235]) by userp3020.oracle.com with ESMTP id 2w1kxe1urs-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Mon, 04 Nov 2019 22:00:19 +0000 Received: from abhmp0006.oracle.com (abhmp0006.oracle.com [141.146.116.12]) by aserv0121.oracle.com (8.14.4/8.13.8) with ESMTP id xA4M0EgW022742; Mon, 4 Nov 2019 22:00:14 GMT Received: from bostrovs-us.us.oracle.com (/10.152.32.65) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Mon, 04 Nov 2019 14:00:13 -0800 To: Jason Gunthorpe , linux-mm@kvack.org, Jerome Glisse , Ralph Campbell , John Hubbard , Felix.Kuehling@amd.com References: <20191028201032.6352-1-jgg@ziepe.ca> <20191028201032.6352-10-jgg@ziepe.ca> From: Boris Ostrovsky Autocrypt: addr=boris.ostrovsky@oracle.com; 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Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.1.1 MIME-Version: 1.0 In-Reply-To: <20191028201032.6352-10-jgg@ziepe.ca> Content-Language: en-US X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9431 signatures=668685 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 suspectscore=0 malwarescore=0 phishscore=0 bulkscore=0 spamscore=0 mlxscore=0 mlxlogscore=999 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1908290000 definitions=main-1911040210 X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9431 signatures=668685 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 priorityscore=1501 malwarescore=0 suspectscore=0 phishscore=0 bulkscore=0 spamscore=0 clxscore=1015 lowpriorityscore=0 mlxscore=0 impostorscore=0 mlxlogscore=999 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1908290000 definitions=main-1911040210 Subject: Re: [Xen-devel] [PATCH v2 09/15] xen/gntdev: use mmu_range_notifier_insert X-BeenThere: xen-devel@lists.xenproject.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: Xen developer discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Cc: Juergen Gross , David Zhou , Mike Marciniszyn , Stefano Stabellini , Oleksandr Andrushchenko , linux-rdma@vger.kernel.org, nouveau@lists.freedesktop.org, Dennis Dalessandro , amd-gfx@lists.freedesktop.org, Christoph Hellwig , Jason Gunthorpe , dri-devel@lists.freedesktop.org, Alex Deucher , xen-devel@lists.xenproject.org, Petr Cvek , =?UTF-8?Q?Christian_K=c3=b6nig?= , Ben Skeggs Content-Type: text/plain; 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charset="utf-8" Content-Transfer-Encoding: base64 Errors-To: amd-gfx-bounces@lists.freedesktop.org Sender: "amd-gfx" Message-ID: <20191104220331.APi8xpEpxZOLm_akgGExBXnEAFQS9S4Pgr6comFaoy0@z> T24gMTAvMjgvMTkgNDoxMCBQTSwgSmFzb24gR3VudGhvcnBlIHdyb3RlOgo+IEBAIC00NDUsMTcg KzQzOCw5IEBAIHN0YXRpYyB2b2lkIGdudGRldl92bWFfY2xvc2Uoc3RydWN0IHZtX2FyZWFfc3Ry dWN0ICp2bWEpCj4gIAlzdHJ1Y3QgZ250ZGV2X3ByaXYgKnByaXYgPSBmaWxlLT5wcml2YXRlX2Rh dGE7Cj4gIAo+ICAJcHJfZGVidWcoImdudGRldl92bWFfY2xvc2UgJXBcbiIsIHZtYSk7Cj4gLQlp ZiAodXNlX3B0ZW1vZCkgewo+IC0JCS8qIEl0IGlzIHBvc3NpYmxlIHRoYXQgYW4gbW11IG5vdGlm aWVyIGNvdWxkIGJlIHJ1bm5pbmcKPiAtCQkgKiBjb25jdXJyZW50bHksIHNvIHRha2UgcHJpdi0+ bG9jayB0byBlbnN1cmUgdGhhdCB0aGUgdm1hIHdvbid0Cj4gLQkJICogdmFuaXNoaW5nIGR1cmlu ZyB0aGUgdW5tYXBfZ3JhbnRfcGFnZXMgY2FsbCwgc2luY2Ugd2Ugd2lsbAo+IC0JCSAqIHNwaW4g aGVyZSB1bnRpbCB0aGF0IGNvbXBsZXRlcy4gU3VjaCBhIGNvbmN1cnJlbnQgY2FsbCB3aWxsCj4g LQkJICogbm90IGRvIGFueSB1bm1hcHBpbmcsIHNpbmNlIHRoYXQgaGFzIGJlZW4gZG9uZSBwcmlv ciB0bwo+IC0JCSAqIGNsb3NpbmcgdGhlIHZtYSwgYnV0IGl0IG1heSBzdGlsbCBpdGVyYXRlIHRo ZSB1bm1hcF9vcHMgbGlzdC4KPiAtCQkgKi8KPiAtCQltdXRleF9sb2NrKCZwcml2LT5sb2NrKTsK PiArCWlmICh1c2VfcHRlbW9kICYmIG1hcC0+dm1hID09IHZtYSkgewoKCklzIGl0IHBvc3NpYmxl IGZvciBtYXAtPnZtYSBub3QgdG8gYmUgZXF1YWwgdG8gdm1hPwoKLWJvcmlzCgoKPiArCQltbXVf cmFuZ2Vfbm90aWZpZXJfcmVtb3ZlKCZtYXAtPm5vdGlmaWVyKTsKPiAgCQltYXAtPnZtYSA9IE5V TEw7Cj4gLQkJbXV0ZXhfdW5sb2NrKCZwcml2LT5sb2NrKTsKPiAgCX0KPiAgCXZtYS0+dm1fcHJp dmF0ZV9kYXRhID0gTlVMTDsKPiAgCWdudGRldl9wdXRfbWFwKHByaXYsIG1hcCk7Cj4KCl9fX19f X19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fCmFtZC1nZnggbWFpbGlu ZyBsaXN0CmFtZC1nZnhAbGlzdHMuZnJlZWRlc2t0b3Aub3JnCmh0dHBzOi8vbGlzdHMuZnJlZWRl c2t0b3Aub3JnL21haWxtYW4vbGlzdGluZm8vYW1kLWdmeA==