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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: 4ebc8093-78da-4744-13e7-08d75f0021dc x-ms-traffictypediagnostic: VI1PR05MB3293: x-microsoft-antispam-prvs: x-ms-oob-tlc-oobclassifiers: OLM:9508; x-forefront-prvs: 020877E0CB x-forefront-antispam-report: SFV:NSPM;SFS:(10009020)(4636009)(366004)(39860400002)(346002)(376002)(136003)(396003)(199004)(189003)(305945005)(6916009)(7416002)(186003)(64756008)(6436002)(6486002)(7736002)(66556008)(66946007)(2906002)(66476007)(2616005)(86362001)(229853002)(5660300002)(26005)(11346002)(476003)(446003)(102836004)(66446008)(8936002)(81166006)(486006)(81156014)(25786009)(8676002)(54906003)(33656002)(6246003)(5024004)(76176011)(14454004)(6512007)(71190400001)(66066001)(6116002)(99286004)(256004)(3846002)(4326008)(52116002)(1076003)(6506007)(53546011)(386003)(36756003)(14444005)(478600001)(71200400001)(316002);DIR:OUT;SFP:1101;SCL:1;SRVR:VI1PR05MB3293;H:VI1PR05MB4141.eurprd05.prod.outlook.com;FPR:;SPF:None;LANG:en;PTR:InfoNoRecords;A:1;MX: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: fSlSY7hCY9Q7BmauGFQSMsk0zKjuAauK4ZzMstrTfQ3zJeGmEL4qhMRyS+4WkTdK3btWXPh04Lcj3U33mSYZPfYzGrOOFXUJWnPk9kBGm2PPxEy4AQjFMtQoMxvKsL12L+HrR1UCwqFmnGwT1shLo3uA5AYx8GG5gTI5yCZYRYPac4GCAlyj0eGQJRdhGz8SBAfrmXQmPVgvmWfccOi86lqQ3HnWHbIYkAzYM63I2Eri708M/f2439XARJPQlftr5+qt5YJ0MOd3mnq48YxcPA6Kj2ueYgiZE1aVRB8GGNu4XzBzp3PqczMPZbgk/Klsve0xbvoj/cgzFScCHEB74eZRV676vH9QYmQEqSq/t4fjUQ2rfU71arRZYipRAYMgVC+8aaCH9QKlGrvzTRVp6iRQRFDkN+SZQk4E3k5ycx7m6O2bULYq39Uf1NgUau0+ x-ms-exchange-transport-forked: True Content-Type: text/plain; charset="iso-8859-1" Content-ID: <18553814D461244CA039C5C384EE49D3@eurprd05.prod.outlook.com> Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginatorOrg: Mellanox.com X-MS-Exchange-CrossTenant-Network-Message-Id: 4ebc8093-78da-4744-13e7-08d75f0021dc X-MS-Exchange-CrossTenant-originalarrivaltime: 01 Nov 2019 19:17:27.1712 (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: SxUeovUvghjC4HW/Rwc15VCds4SMw74yHkiedwxpYW6v2wfry4534u7+72twT6C5M8UUHnmLIolaKMtnXCAZpg== X-MS-Exchange-Transport-CrossTenantHeadersStamped: VI1PR05MB3293 Sender: linux-rdma-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-rdma@vger.kernel.org On Fri, Nov 01, 2019 at 02:51:46PM -0400, Boris Ostrovsky wrote: > On 11/1/19 1:48 PM, Jason Gunthorpe wrote: > > On Wed, Oct 30, 2019 at 12:55:37PM -0400, Boris Ostrovsky wrote: > >> On 10/28/19 4:10 PM, Jason Gunthorpe wrote: > >>> From: Jason Gunthorpe > >>> > >>> gntdev simply wants to monitor a specific VMA for any notifier events= , > >>> this can be done straightforwardly using mmu_range_notifier_insert() = over > >>> the VMA's VA range. > >>> > >>> The notifier should be attached until the original VMA is destroyed. > >>> > >>> It is unclear if any of this is even sane, but at least a lot of dupl= icate > >>> code is removed. > >> I didn't have a chance to look at the patch itself yet but as a heads-= up > > Thanks Boris. I spent a bit of time and got a VM running with a xen > > 4.9 hypervisor and a kernel with this patch series. It a ubuntu bionic > > VM with the distro's xen stuff. > > > > Can you give some guidance how you made it crash?=20 >=20 > It crashes trying to dereference mrn->ops->invalidate in > mn_itree_invalidate() when a guest exits. >=20 > I don't think you've initialized notifier ops. I don't see you using > gntdev_mmu_ops anywhere. So weird the compiler didn't complain about an unused static... But yes, this is a mistake, it should be: diff --git a/drivers/xen/gntdev.c b/drivers/xen/gntdev.c index 37b278857ad807..0ca35485fd3865 100644 --- a/drivers/xen/gntdev.c +++ b/drivers/xen/gntdev.c @@ -1011,6 +1011,7 @@ static int gntdev_mmap(struct file *flip, struct vm_a= rea_struct *vma) =20 if (use_ptemod) { map->vma =3D vma; + map->notifier.ops =3D &gntdev_mmu_ops; err =3D mmu_range_notifier_insert_locked( &map->notifier, vma->vm_start, vma->vm_end - vma->vm_start, vma->vm_mm); Thanks, 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: Fri, 1 Nov 2019 19:17:27 +0000 Message-ID: <20191101191723.GT22766@mellanox.com> References: <20191028201032.6352-1-jgg@ziepe.ca> <20191028201032.6352-10-jgg@ziepe.ca> <0355257f-6a3a-cdcd-d206-aec3df97dded@oracle.com> <20191101174824.GP22766@mellanox.com> <14f96c2e-ee04-5b1a-fc32-2db1487df399@oracle.com> Mime-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Return-path: In-Reply-To: <14f96c2e-ee04-5b1a-fc32-2db1487df399@oracle.com> Content-Language: en-US Content-ID: <18553814D461244CA039C5C384EE49D3@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 T24gRnJpLCBOb3YgMDEsIDIwMTkgYXQgMDI6NTE6NDZQTSAtMDQwMCwgQm9yaXMgT3N0cm92c2t5 IHdyb3RlOgo+IE9uIDExLzEvMTkgMTo0OCBQTSwgSmFzb24gR3VudGhvcnBlIHdyb3RlOgo+ID4g T24gV2VkLCBPY3QgMzAsIDIwMTkgYXQgMTI6NTU6MzdQTSAtMDQwMCwgQm9yaXMgT3N0cm92c2t5 IHdyb3RlOgo+ID4+IE9uIDEwLzI4LzE5IDQ6MTAgUE0sIEphc29uIEd1bnRob3JwZSB3cm90ZToK PiA+Pj4gRnJvbTogSmFzb24gR3VudGhvcnBlIDxqZ2dAbWVsbGFub3guY29tPgo+ID4+Pgo+ID4+ PiBnbnRkZXYgc2ltcGx5IHdhbnRzIHRvIG1vbml0b3IgYSBzcGVjaWZpYyBWTUEgZm9yIGFueSBu b3RpZmllciBldmVudHMsCj4gPj4+IHRoaXMgY2FuIGJlIGRvbmUgc3RyYWlnaHRmb3J3YXJkbHkg dXNpbmcgbW11X3JhbmdlX25vdGlmaWVyX2luc2VydCgpIG92ZXIKPiA+Pj4gdGhlIFZNQSdzIFZB IHJhbmdlLgo+ID4+Pgo+ID4+PiBUaGUgbm90aWZpZXIgc2hvdWxkIGJlIGF0dGFjaGVkIHVudGls IHRoZSBvcmlnaW5hbCBWTUEgaXMgZGVzdHJveWVkLgo+ID4+Pgo+ID4+PiBJdCBpcyB1bmNsZWFy IGlmIGFueSBvZiB0aGlzIGlzIGV2ZW4gc2FuZSwgYnV0IGF0IGxlYXN0IGEgbG90IG9mIGR1cGxp Y2F0ZQo+ID4+PiBjb2RlIGlzIHJlbW92ZWQuCj4gPj4gSSBkaWRuJ3QgaGF2ZSBhIGNoYW5jZSB0 byBsb29rIGF0IHRoZSBwYXRjaCBpdHNlbGYgeWV0IGJ1dCBhcyBhIGhlYWRzLXVwCj4gPiBUaGFu a3MgQm9yaXMuIEkgc3BlbnQgYSBiaXQgb2YgdGltZSBhbmQgZ290IGEgVk0gcnVubmluZyB3aXRo IGEgeGVuCj4gPiA0LjkgaHlwZXJ2aXNvciBhbmQgYSBrZXJuZWwgd2l0aCB0aGlzIHBhdGNoIHNl cmllcy4gSXQgYSB1YnVudHUgYmlvbmljCj4gPiBWTSB3aXRoIHRoZSBkaXN0cm8ncyB4ZW4gc3R1 ZmYuCj4gPgo+ID4gQ2FuIHlvdSBnaXZlIHNvbWUgZ3VpZGFuY2UgaG93IHlvdSBtYWRlIGl0IGNy YXNoPyAKPiAKPiBJdCBjcmFzaGVzIHRyeWluZyB0byBkZXJlZmVyZW5jZSBtcm4tPm9wcy0+aW52 YWxpZGF0ZSBpbgo+IG1uX2l0cmVlX2ludmFsaWRhdGUoKSB3aGVuIGEgZ3Vlc3QgZXhpdHMuCj4g Cj4gSSBkb24ndCB0aGluayB5b3UndmUgaW5pdGlhbGl6ZWQgbm90aWZpZXIgb3BzLiBJIGRvbid0 IHNlZSB5b3UgdXNpbmcKPiBnbnRkZXZfbW11X29wcyBhbnl3aGVyZS4KClNvIHdlaXJkIHRoZSBj b21waWxlciBkaWRuJ3QgY29tcGxhaW4gYWJvdXQgYW4gdW51c2VkIHN0YXRpYy4uLgoKQnV0IHll cywgdGhpcyBpcyBhIG1pc3Rha2UsIGl0IHNob3VsZCBiZToKCmRpZmYgLS1naXQgYS9kcml2ZXJz L3hlbi9nbnRkZXYuYyBiL2RyaXZlcnMveGVuL2dudGRldi5jCmluZGV4IDM3YjI3ODg1N2FkODA3 Li4wY2EzNTQ4NWZkMzg2NSAxMDA2NDQKLS0tIGEvZHJpdmVycy94ZW4vZ250ZGV2LmMKKysrIGIv ZHJpdmVycy94ZW4vZ250ZGV2LmMKQEAgLTEwMTEsNiArMTAxMSw3IEBAIHN0YXRpYyBpbnQgZ250 ZGV2X21tYXAoc3RydWN0IGZpbGUgKmZsaXAsIHN0cnVjdCB2bV9hcmVhX3N0cnVjdCAqdm1hKQog CiAJaWYgKHVzZV9wdGVtb2QpIHsKIAkJbWFwLT52bWEgPSB2bWE7CisJCW1hcC0+bm90aWZpZXIu b3BzID0gJmdudGRldl9tbXVfb3BzOwogCQllcnIgPSBtbXVfcmFuZ2Vfbm90aWZpZXJfaW5zZXJ0 X2xvY2tlZCgKIAkJCSZtYXAtPm5vdGlmaWVyLCB2bWEtPnZtX3N0YXJ0LAogCQkJdm1hLT52bV9l bmQgLSB2bWEtPnZtX3N0YXJ0LCB2bWEtPnZtX21tKTsKClRoYW5rcywKSmFzb24KCl9fX19fX19f X19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fClhlbi1kZXZlbCBtYWlsaW5n IGxpc3QKWGVuLWRldmVsQGxpc3RzLnhlbnByb2plY3Qub3JnCmh0dHBzOi8vbGlzdHMueGVucHJv amVjdC5vcmcvbWFpbG1hbi9saXN0aW5mby94ZW4tZGV2ZWw= 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=-3.5 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS,URIBL_BLOCKED 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 AFFA6CA9ECF 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: <20191101191727.lHtxsUZg4tR9tElkC5aMG7rbJNmtMX1jVtxYbmmx-PU@z> T24gRnJpLCBOb3YgMDEsIDIwMTkgYXQgMDI6NTE6NDZQTSAtMDQwMCwgQm9yaXMgT3N0cm92c2t5 IHdyb3RlOgo+IE9uIDExLzEvMTkgMTo0OCBQTSwgSmFzb24gR3VudGhvcnBlIHdyb3RlOgo+ID4g T24gV2VkLCBPY3QgMzAsIDIwMTkgYXQgMTI6NTU6MzdQTSAtMDQwMCwgQm9yaXMgT3N0cm92c2t5 IHdyb3RlOgo+ID4+IE9uIDEwLzI4LzE5IDQ6MTAgUE0sIEphc29uIEd1bnRob3JwZSB3cm90ZToK PiA+Pj4gRnJvbTogSmFzb24gR3VudGhvcnBlIDxqZ2dAbWVsbGFub3guY29tPgo+ID4+Pgo+ID4+ PiBnbnRkZXYgc2ltcGx5IHdhbnRzIHRvIG1vbml0b3IgYSBzcGVjaWZpYyBWTUEgZm9yIGFueSBu b3RpZmllciBldmVudHMsCj4gPj4+IHRoaXMgY2FuIGJlIGRvbmUgc3RyYWlnaHRmb3J3YXJkbHkg dXNpbmcgbW11X3JhbmdlX25vdGlmaWVyX2luc2VydCgpIG92ZXIKPiA+Pj4gdGhlIFZNQSdzIFZB IHJhbmdlLgo+ID4+Pgo+ID4+PiBUaGUgbm90aWZpZXIgc2hvdWxkIGJlIGF0dGFjaGVkIHVudGls IHRoZSBvcmlnaW5hbCBWTUEgaXMgZGVzdHJveWVkLgo+ID4+Pgo+ID4+PiBJdCBpcyB1bmNsZWFy IGlmIGFueSBvZiB0aGlzIGlzIGV2ZW4gc2FuZSwgYnV0IGF0IGxlYXN0IGEgbG90IG9mIGR1cGxp Y2F0ZQo+ID4+PiBjb2RlIGlzIHJlbW92ZWQuCj4gPj4gSSBkaWRuJ3QgaGF2ZSBhIGNoYW5jZSB0 byBsb29rIGF0IHRoZSBwYXRjaCBpdHNlbGYgeWV0IGJ1dCBhcyBhIGhlYWRzLXVwCj4gPiBUaGFu a3MgQm9yaXMuIEkgc3BlbnQgYSBiaXQgb2YgdGltZSBhbmQgZ290IGEgVk0gcnVubmluZyB3aXRo IGEgeGVuCj4gPiA0LjkgaHlwZXJ2aXNvciBhbmQgYSBrZXJuZWwgd2l0aCB0aGlzIHBhdGNoIHNl cmllcy4gSXQgYSB1YnVudHUgYmlvbmljCj4gPiBWTSB3aXRoIHRoZSBkaXN0cm8ncyB4ZW4gc3R1 ZmYuCj4gPgo+ID4gQ2FuIHlvdSBnaXZlIHNvbWUgZ3VpZGFuY2UgaG93IHlvdSBtYWRlIGl0IGNy YXNoPyAKPiAKPiBJdCBjcmFzaGVzIHRyeWluZyB0byBkZXJlZmVyZW5jZSBtcm4tPm9wcy0+aW52 YWxpZGF0ZSBpbgo+IG1uX2l0cmVlX2ludmFsaWRhdGUoKSB3aGVuIGEgZ3Vlc3QgZXhpdHMuCj4g Cj4gSSBkb24ndCB0aGluayB5b3UndmUgaW5pdGlhbGl6ZWQgbm90aWZpZXIgb3BzLiBJIGRvbid0 IHNlZSB5b3UgdXNpbmcKPiBnbnRkZXZfbW11X29wcyBhbnl3aGVyZS4KClNvIHdlaXJkIHRoZSBj b21waWxlciBkaWRuJ3QgY29tcGxhaW4gYWJvdXQgYW4gdW51c2VkIHN0YXRpYy4uLgoKQnV0IHll cywgdGhpcyBpcyBhIG1pc3Rha2UsIGl0IHNob3VsZCBiZToKCmRpZmYgLS1naXQgYS9kcml2ZXJz L3hlbi9nbnRkZXYuYyBiL2RyaXZlcnMveGVuL2dudGRldi5jCmluZGV4IDM3YjI3ODg1N2FkODA3 Li4wY2EzNTQ4NWZkMzg2NSAxMDA2NDQKLS0tIGEvZHJpdmVycy94ZW4vZ250ZGV2LmMKKysrIGIv ZHJpdmVycy94ZW4vZ250ZGV2LmMKQEAgLTEwMTEsNiArMTAxMSw3IEBAIHN0YXRpYyBpbnQgZ250 ZGV2X21tYXAoc3RydWN0IGZpbGUgKmZsaXAsIHN0cnVjdCB2bV9hcmVhX3N0cnVjdCAqdm1hKQog CiAJaWYgKHVzZV9wdGVtb2QpIHsKIAkJbWFwLT52bWEgPSB2bWE7CisJCW1hcC0+bm90aWZpZXIu b3BzID0gJmdudGRldl9tbXVfb3BzOwogCQllcnIgPSBtbXVfcmFuZ2Vfbm90aWZpZXJfaW5zZXJ0 X2xvY2tlZCgKIAkJCSZtYXAtPm5vdGlmaWVyLCB2bWEtPnZtX3N0YXJ0LAogCQkJdm1hLT52bV9l bmQgLSB2bWEtPnZtX3N0YXJ0LCB2bWEtPnZtX21tKTsKClRoYW5rcywKSmFzb24KX19fX19fX19f X19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX18KYW1kLWdmeCBtYWlsaW5nIGxp c3QKYW1kLWdmeEBsaXN0cy5mcmVlZGVza3RvcC5vcmcKaHR0cHM6Ly9saXN0cy5mcmVlZGVza3Rv cC5vcmcvbWFpbG1hbi9saXN0aW5mby9hbWQtZ2Z4