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x-ms-exchange-messagesentrepresentingtype: 1 x-originating-ip: [142.162.113.180] x-ms-publictraffictype: Email x-ms-office365-filtering-ht: Tenant x-ms-office365-filtering-correlation-id: a5aff1ba-e389-4613-96b3-08d761983919 x-ms-traffictypediagnostic: VI1PR05MB4973: x-microsoft-antispam-prvs: x-ms-oob-tlc-oobclassifiers: OLM:9508; x-forefront-prvs: 0212BDE3BE x-forefront-antispam-report: SFV:NSPM;SFS:(10009020)(4636009)(396003)(39860400002)(136003)(366004)(346002)(376002)(189003)(199004)(36756003)(6486002)(256004)(52116002)(486006)(14444005)(478600001)(86362001)(14454004)(186003)(305945005)(7416002)(2906002)(102836004)(7736002)(6116002)(26005)(66476007)(66556008)(66446008)(64756008)(66946007)(76176011)(11346002)(99286004)(71190400001)(316002)(2616005)(71200400001)(8936002)(6436002)(33656002)(3846002)(25786009)(6916009)(6506007)(53546011)(386003)(66066001)(6512007)(81166006)(446003)(229853002)(54906003)(4326008)(81156014)(6246003)(5660300002)(1076003)(476003)(8676002);DIR:OUT;SFP:1101;SCL:1;SRVR:VI1PR05MB4973;H:VI1PR05MB4141.eurprd05.prod.outlook.com;FPR:;SPF:None;LANG:en;PTR:InfoNoRecords;MX:1;A:1; received-spf: None (protection.outlook.com: mellanox.com does not designate permitted sender hosts) x-ms-exchange-senderadcheck: 1 x-microsoft-antispam: BCL:0; x-microsoft-antispam-message-info: vBZ0Z2NhVzsjJAe7Kq9mS/lVT87prjRY2DebHQtJLF8qghumsbIK3H9j8SO5o9fRUHiDj4VrpWRspleFcQEM/exPW99z+IuP8gqlla+63kdrBW88TKbquJmgA6qGVWIPYh9wMiekbatqIReFH3LF66Qg20Oo26z+uEoyRtEdqPvPRoNgTV3Pd6hqVMX4MdMBlFJpshWk0Z8fucylMQgeAUbEZ46pUaaz1mXI430lroI5SQ3jYp/3WvSgOr9aLqwFg8Hhvig3+KCaaS5G++dwOVy4/xNG/Swl4kR5pVVDkbD2VlNVK8NjsBFRMPfuFdClo/rob/sGbRw6HbEn/mhc7rylSKwPO2pVON6XMKiPL7VWwbM36Hs00yub8qItDx8QrLh06/VvDEkaQgAPe3It7rfei9KmuGwOlFIxkYQDqQnfppA1iusicblqmMJldO24 x-ms-exchange-transport-forked: True Content-Type: text/plain; charset="iso-8859-1" Content-ID: <27A5E315F0FBE349AC48D47C02A20B09@eurprd05.prod.outlook.com> Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginatorOrg: Mellanox.com X-MS-Exchange-CrossTenant-Network-Message-Id: a5aff1ba-e389-4613-96b3-08d761983919 X-MS-Exchange-CrossTenant-originalarrivaltime: 05 Nov 2019 02:31:12.3841 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: a652971c-7d2e-4d9b-a6a4-d149256f461b X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: x4a6UsdCOfg0iur9gbQw05+LLww53hTdCx+jkPZ/cAoDUgl4GRRDrh+zIq3jbBkkF7kv+st9bYwT7/EoofKpRg== X-MS-Exchange-Transport-CrossTenantHeadersStamped: VI1PR05MB4973 Sender: linux-rdma-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-rdma@vger.kernel.org On Mon, Nov 04, 2019 at 05:03:31PM -0500, Boris Ostrovsky wrote: > 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 =3D file->private_data; > > =20 > > 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 =3D=3D vma) { >=20 >=20 > Is it possible for map->vma not to be equal to vma? It could be NULL at least if use_ptemod is not set. Otherwise, I'm not sure, the confusing bit is that the map comes from here: map =3D gntdev_find_map_index(priv, index, count); It looks like the intent is that the map->vma is always set to the only vma that has the map as private_data. So, I suppose it can be relaxed to a null test and a WARN_ON that it hasn't changed? Jason From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jason Gunthorpe Subject: Re: [PATCH v2 09/15] xen/gntdev: use mmu_range_notifier_insert Date: Tue, 5 Nov 2019 02:31:12 +0000 Message-ID: <20191105023108.GN22766@mellanox.com> References: <20191028201032.6352-1-jgg@ziepe.ca> <20191028201032.6352-10-jgg@ziepe.ca> <3938b588-c6c5-3bd1-8ea9-47e4d5b2045c@oracle.com> Mime-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Return-path: In-Reply-To: <3938b588-c6c5-3bd1-8ea9-47e4d5b2045c@oracle.com> Content-Language: en-US Content-ID: <27A5E315F0FBE349AC48D47C02A20B09@eurprd05.prod.outlook.com> List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: xen-devel-bounces@lists.xenproject.org Sender: "Xen-devel" To: Boris Ostrovsky Cc: Juergen Gross , David Zhou , Ralph Campbell , Stefano Stabellini , Oleksandr Andrushchenko , "linux-rdma@vger.kernel.org" , John Hubbard , "Felix.Kuehling@amd.com" , Mike Marciniszyn , "dri-devel@lists.freedesktop.org" , Christoph Hellwig , "linux-mm@kvack.org" , Jerome Glisse , "amd-gfx@lists.freedesktop.org" , "nouveau@lists.freedesktop.org" , Alex Deucher , "xen-devel@lists.xenproject.org" , Dennis Dalessandro List-Id: nouveau.vger.kernel.org T24gTW9uLCBOb3YgMDQsIDIwMTkgYXQgMDU6MDM6MzFQTSAtMDUwMCwgQm9yaXMgT3N0cm92c2t5 IHdyb3RlOgo+IE9uIDEwLzI4LzE5IDQ6MTAgUE0sIEphc29uIEd1bnRob3JwZSB3cm90ZToKPiA+ IEBAIC00NDUsMTcgKzQzOCw5IEBAIHN0YXRpYyB2b2lkIGdudGRldl92bWFfY2xvc2Uoc3RydWN0 IHZtX2FyZWFfc3RydWN0ICp2bWEpCj4gPiAgCXN0cnVjdCBnbnRkZXZfcHJpdiAqcHJpdiA9IGZp bGUtPnByaXZhdGVfZGF0YTsKPiA+ICAKPiA+ICAJcHJfZGVidWcoImdudGRldl92bWFfY2xvc2Ug JXBcbiIsIHZtYSk7Cj4gPiAtCWlmICh1c2VfcHRlbW9kKSB7Cj4gPiAtCQkvKiBJdCBpcyBwb3Nz aWJsZSB0aGF0IGFuIG1tdSBub3RpZmllciBjb3VsZCBiZSBydW5uaW5nCj4gPiAtCQkgKiBjb25j dXJyZW50bHksIHNvIHRha2UgcHJpdi0+bG9jayB0byBlbnN1cmUgdGhhdCB0aGUgdm1hIHdvbid0 Cj4gPiAtCQkgKiB2YW5pc2hpbmcgZHVyaW5nIHRoZSB1bm1hcF9ncmFudF9wYWdlcyBjYWxsLCBz aW5jZSB3ZSB3aWxsCj4gPiAtCQkgKiBzcGluIGhlcmUgdW50aWwgdGhhdCBjb21wbGV0ZXMuIFN1 Y2ggYSBjb25jdXJyZW50IGNhbGwgd2lsbAo+ID4gLQkJICogbm90IGRvIGFueSB1bm1hcHBpbmcs IHNpbmNlIHRoYXQgaGFzIGJlZW4gZG9uZSBwcmlvciB0bwo+ID4gLQkJICogY2xvc2luZyB0aGUg dm1hLCBidXQgaXQgbWF5IHN0aWxsIGl0ZXJhdGUgdGhlIHVubWFwX29wcyBsaXN0Lgo+ID4gLQkJ ICovCj4gPiAtCQltdXRleF9sb2NrKCZwcml2LT5sb2NrKTsKPiA+ICsJaWYgKHVzZV9wdGVtb2Qg JiYgbWFwLT52bWEgPT0gdm1hKSB7Cj4gCj4gCj4gSXMgaXQgcG9zc2libGUgZm9yIG1hcC0+dm1h IG5vdCB0byBiZSBlcXVhbCB0byB2bWE/CgpJdCBjb3VsZCBiZSBOVUxMIGF0IGxlYXN0IGlmIHVz ZV9wdGVtb2QgaXMgbm90IHNldC4KCk90aGVyd2lzZSwgSSdtIG5vdCBzdXJlLCB0aGUgY29uZnVz aW5nIGJpdCBpcyB0aGF0IHRoZSBtYXAgY29tZXMgZnJvbQpoZXJlOgoKICAgICAgICBtYXAgPSBn bnRkZXZfZmluZF9tYXBfaW5kZXgocHJpdiwgaW5kZXgsIGNvdW50KTsKCkl0IGxvb2tzIGxpa2Ug dGhlIGludGVudCBpcyB0aGF0IHRoZSBtYXAtPnZtYSBpcyBhbHdheXMgc2V0IHRvIHRoZQpvbmx5 IHZtYSB0aGF0IGhhcyB0aGUgbWFwIGFzIHByaXZhdGVfZGF0YS4KClNvLCBJIHN1cHBvc2UgaXQg Y2FuIGJlIHJlbGF4ZWQgdG8gYSBudWxsIHRlc3QgYW5kIGEgV0FSTl9PTiB0aGF0IGl0Cmhhc24n dCBjaGFuZ2VkPwoKSmFzb24KCl9fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19f X19fX19fX19fClhlbi1kZXZlbCBtYWlsaW5nIGxpc3QKWGVuLWRldmVsQGxpc3RzLnhlbnByb2pl Y3Qub3JnCmh0dHBzOi8vbGlzdHMueGVucHJvamVjdC5vcmcvbWFpbG1hbi9saXN0aW5mby94ZW4t ZGV2ZWw= 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=-0.6 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS 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 D7ADBCA9ED3 for ; 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charset="utf-8" Content-Transfer-Encoding: base64 Errors-To: amd-gfx-bounces@lists.freedesktop.org Sender: "amd-gfx" Message-ID: <20191105023112.lOxbQY1HNgCp8lSvR4Vl4OXQykcaoMuafopqUtFbUmE@z> T24gTW9uLCBOb3YgMDQsIDIwMTkgYXQgMDU6MDM6MzFQTSAtMDUwMCwgQm9yaXMgT3N0cm92c2t5 IHdyb3RlOgo+IE9uIDEwLzI4LzE5IDQ6MTAgUE0sIEphc29uIEd1bnRob3JwZSB3cm90ZToKPiA+ IEBAIC00NDUsMTcgKzQzOCw5IEBAIHN0YXRpYyB2b2lkIGdudGRldl92bWFfY2xvc2Uoc3RydWN0 IHZtX2FyZWFfc3RydWN0ICp2bWEpCj4gPiAgCXN0cnVjdCBnbnRkZXZfcHJpdiAqcHJpdiA9IGZp bGUtPnByaXZhdGVfZGF0YTsKPiA+ICAKPiA+ICAJcHJfZGVidWcoImdudGRldl92bWFfY2xvc2Ug JXBcbiIsIHZtYSk7Cj4gPiAtCWlmICh1c2VfcHRlbW9kKSB7Cj4gPiAtCQkvKiBJdCBpcyBwb3Nz aWJsZSB0aGF0IGFuIG1tdSBub3RpZmllciBjb3VsZCBiZSBydW5uaW5nCj4gPiAtCQkgKiBjb25j dXJyZW50bHksIHNvIHRha2UgcHJpdi0+bG9jayB0byBlbnN1cmUgdGhhdCB0aGUgdm1hIHdvbid0 Cj4gPiAtCQkgKiB2YW5pc2hpbmcgZHVyaW5nIHRoZSB1bm1hcF9ncmFudF9wYWdlcyBjYWxsLCBz aW5jZSB3ZSB3aWxsCj4gPiAtCQkgKiBzcGluIGhlcmUgdW50aWwgdGhhdCBjb21wbGV0ZXMuIFN1 Y2ggYSBjb25jdXJyZW50IGNhbGwgd2lsbAo+ID4gLQkJICogbm90IGRvIGFueSB1bm1hcHBpbmcs IHNpbmNlIHRoYXQgaGFzIGJlZW4gZG9uZSBwcmlvciB0bwo+ID4gLQkJICogY2xvc2luZyB0aGUg dm1hLCBidXQgaXQgbWF5IHN0aWxsIGl0ZXJhdGUgdGhlIHVubWFwX29wcyBsaXN0Lgo+ID4gLQkJ ICovCj4gPiAtCQltdXRleF9sb2NrKCZwcml2LT5sb2NrKTsKPiA+ICsJaWYgKHVzZV9wdGVtb2Qg JiYgbWFwLT52bWEgPT0gdm1hKSB7Cj4gCj4gCj4gSXMgaXQgcG9zc2libGUgZm9yIG1hcC0+dm1h IG5vdCB0byBiZSBlcXVhbCB0byB2bWE/CgpJdCBjb3VsZCBiZSBOVUxMIGF0IGxlYXN0IGlmIHVz ZV9wdGVtb2QgaXMgbm90IHNldC4KCk90aGVyd2lzZSwgSSdtIG5vdCBzdXJlLCB0aGUgY29uZnVz aW5nIGJpdCBpcyB0aGF0IHRoZSBtYXAgY29tZXMgZnJvbQpoZXJlOgoKICAgICAgICBtYXAgPSBn bnRkZXZfZmluZF9tYXBfaW5kZXgocHJpdiwgaW5kZXgsIGNvdW50KTsKCkl0IGxvb2tzIGxpa2Ug dGhlIGludGVudCBpcyB0aGF0IHRoZSBtYXAtPnZtYSBpcyBhbHdheXMgc2V0IHRvIHRoZQpvbmx5 IHZtYSB0aGF0IGhhcyB0aGUgbWFwIGFzIHByaXZhdGVfZGF0YS4KClNvLCBJIHN1cHBvc2UgaXQg Y2FuIGJlIHJlbGF4ZWQgdG8gYSBudWxsIHRlc3QgYW5kIGEgV0FSTl9PTiB0aGF0IGl0Cmhhc24n dCBjaGFuZ2VkPwoKSmFzb24KX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19f X19fX19fX18KYW1kLWdmeCBtYWlsaW5nIGxpc3QKYW1kLWdmeEBsaXN0cy5mcmVlZGVza3RvcC5v cmcKaHR0cHM6Ly9saXN0cy5mcmVlZGVza3RvcC5vcmcvbWFpbG1hbi9saXN0aW5mby9hbWQtZ2Z4