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=-3.8 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SIGNED_OFF_BY,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 782BAC49ED7 for ; Fri, 13 Sep 2019 08:04:42 +0000 (UTC) Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 4553F207FC for ; Fri, 13 Sep 2019 08:04:42 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (1024-bit key) header.d=citrix.com header.i=@citrix.com header.b="BdMcrlE5" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 4553F207FC Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=citrix.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Received: from localhost ([::1]:41092 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1i8gZN-0007Ne-DL for qemu-devel@archiver.kernel.org; Fri, 13 Sep 2019 04:04:41 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:40757) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1i8gYV-0006uN-HF for qemu-devel@nongnu.org; Fri, 13 Sep 2019 04:03:48 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1i8gYU-0002QD-3y for qemu-devel@nongnu.org; Fri, 13 Sep 2019 04:03:47 -0400 Received: from esa5.hc3370-68.iphmx.com ([216.71.155.168]:24847) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1i8gYT-0002PY-R9 for qemu-devel@nongnu.org; Fri, 13 Sep 2019 04:03:46 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=citrix.com; s=securemail; t=1568361825; h=from:to:cc:subject:date:message-id:references: in-reply-to:content-transfer-encoding:mime-version; bh=uRauKbkGlmg8fwk+PXf7FxlWKRPNEQq0noEt4O9Iw9o=; b=BdMcrlE52i60Iuyhc+ndqGxKjgEp6QOKQ/R92Eh/DRHoG5Tgi08BPmX4 en0w0+BtDLfn52eqacMsl4zU5ixztQE6GGe+w7OmLlgMhBfJE4vcF+1hY Dwy4XQ1ceFC5Xc2eTTm6BZlLCp+fBQC0uV9/mC/8FY8VVUDLVcNV8PXuV Y=; Authentication-Results: esa5.hc3370-68.iphmx.com; dkim=none (message not signed) header.i=none; spf=None smtp.pra=Paul.Durrant@citrix.com; spf=Pass smtp.mailfrom=Paul.Durrant@citrix.com; spf=None smtp.helo=postmaster@mail.citrix.com Received-SPF: None (esa5.hc3370-68.iphmx.com: no sender authenticity information available from domain of Paul.Durrant@citrix.com) identity=pra; client-ip=162.221.158.21; receiver=esa5.hc3370-68.iphmx.com; envelope-from="Paul.Durrant@citrix.com"; x-sender="Paul.Durrant@citrix.com"; x-conformance=sidf_compatible Received-SPF: Pass (esa5.hc3370-68.iphmx.com: domain of Paul.Durrant@citrix.com designates 162.221.158.21 as permitted sender) identity=mailfrom; client-ip=162.221.158.21; receiver=esa5.hc3370-68.iphmx.com; envelope-from="Paul.Durrant@citrix.com"; x-sender="Paul.Durrant@citrix.com"; x-conformance=sidf_compatible; x-record-type="v=spf1"; x-record-text="v=spf1 ip4:209.167.231.154 ip4:178.63.86.133 ip4:195.66.111.40/30 ip4:85.115.9.32/28 ip4:199.102.83.4 ip4:192.28.146.160 ip4:192.28.146.107 ip4:216.52.6.88 ip4:216.52.6.188 ip4:162.221.158.21 ip4:162.221.156.83 ~all" Received-SPF: None (esa5.hc3370-68.iphmx.com: no sender authenticity information available from domain of postmaster@mail.citrix.com) identity=helo; client-ip=162.221.158.21; receiver=esa5.hc3370-68.iphmx.com; envelope-from="Paul.Durrant@citrix.com"; x-sender="postmaster@mail.citrix.com"; x-conformance=sidf_compatible IronPort-SDR: w89N7k8+icj9p0L5rStHYiIeCYj8z5VaZaHdHvupfkM94Nf26OsFN+ya4oeLIOmxFI8rLPH/+s psvLSGkP0l6Bs+e6lfQEu33fJH1atQMObOaFPZeHblJdg70yPN9FSrkbfhvNjiy3iEmr4I0vlD D9dlj7hJFqO/LY7/WnBj8byDvjdAJExE16pCqpi7CSr67A2tlVJXxr/FtapXKs7+K6/UIuuOm8 GEsvH5/pKVJdnvGo019h5dgsN1MKVoNLCqs3NZS/Z65+rxJZ2c3dSFkhoXKn2nxU7xKQ8k1GuR mt4= X-SBRS: 2.7 X-MesageID: 5722127 X-Ironport-Server: esa5.hc3370-68.iphmx.com X-Remote-IP: 162.221.158.21 X-Policy: $RELAYED X-IronPort-AV: E=Sophos;i="5.64,500,1559534400"; d="scan'208";a="5722127" From: Paul Durrant To: Paul Durrant , Anthony Perard Thread-Topic: [PATCH v2 3/3] xen: perform XenDevice clean-up in XenBus watch handler Thread-Index: AQHVaWP1a6uo9FDbNkeviSOLMWhOMKcoAmKAgAAj/tCAARiygA== Date: Fri, 13 Sep 2019 08:03:40 +0000 Message-ID: <9c03c1ba9c1d4c1bb5d8b5a38cbca3de@AMSPEX02CL03.citrite.net> References: <20190912121646.29148-1-paul.durrant@citrix.com> <20190912121646.29148-4-paul.durrant@citrix.com> <20190912150417.GD1308@perard.uk.xensource.com> In-Reply-To: Accept-Language: en-GB, en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-ms-exchange-transport-fromentityheader: Hosted Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 MIME-Version: 1.0 X-detected-operating-system: by eggs.gnu.org: FreeBSD 9.x X-Received-From: 216.71.155.168 Subject: Re: [Qemu-devel] [PATCH v2 3/3] xen: perform XenDevice clean-up in XenBus watch handler X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: "xen-devel@lists.xenproject.org" , Stefano Stabellini , "qemu-devel@nongnu.org" Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" PiAtLS0tLU9yaWdpbmFsIE1lc3NhZ2UtLS0tLQ0KPiBGcm9tOiBYZW4tZGV2ZWwgPHhlbi1kZXZl bC1ib3VuY2VzQGxpc3RzLnhlbnByb2plY3Qub3JnPiBPbiBCZWhhbGYgT2YgUGF1bCBEdXJyYW50 DQo+IFNlbnQ6IDEyIFNlcHRlbWJlciAyMDE5IDE2OjE2DQo+IFRvOiBBbnRob255IFBlcmFyZCA8 YW50aG9ueS5wZXJhcmRAY2l0cml4LmNvbT4NCj4gQ2M6IHhlbi1kZXZlbEBsaXN0cy54ZW5wcm9q ZWN0Lm9yZzsgU3RlZmFubyBTdGFiZWxsaW5pIDxzc3RhYmVsbGluaUBrZXJuZWwub3JnPjsgcWVt dS1kZXZlbEBub25nbnUub3JnDQo+IFN1YmplY3Q6IFJlOiBbWGVuLWRldmVsXSBbUEFUQ0ggdjIg My8zXSB4ZW46IHBlcmZvcm0gWGVuRGV2aWNlIGNsZWFuLXVwIGluIFhlbkJ1cyB3YXRjaCBoYW5k bGVyDQo+IA0KPiA+IC0tLS0tT3JpZ2luYWwgTWVzc2FnZS0tLS0tDQo+ID4gRnJvbTogQW50aG9u eSBQRVJBUkQgPGFudGhvbnkucGVyYXJkQGNpdHJpeC5jb20+DQo+ID4gU2VudDogMTIgU2VwdGVt YmVyIDIwMTkgMTY6MDQNCj4gPiBUbzogUGF1bCBEdXJyYW50IDxQYXVsLkR1cnJhbnRAY2l0cml4 LmNvbT4NCj4gPiBDYzogcWVtdS1kZXZlbEBub25nbnUub3JnOyB4ZW4tZGV2ZWxAbGlzdHMueGVu cHJvamVjdC5vcmc7IFN0ZWZhbm8gU3RhYmVsbGluaQ0KPiA8c3N0YWJlbGxpbmlAa2VybmVsLm9y Zz4NCj4gPiBTdWJqZWN0OiBSZTogW1BBVENIIHYyIDMvM10geGVuOiBwZXJmb3JtIFhlbkRldmlj ZSBjbGVhbi11cCBpbiBYZW5CdXMgd2F0Y2ggaGFuZGxlcg0KPiA+DQo+ID4gT24gVGh1LCBTZXAg MTIsIDIwMTkgYXQgMDE6MTY6NDZQTSArMDEwMCwgUGF1bCBEdXJyYW50IHdyb3RlOg0KPiA+ID4g Q2xlYW5pbmcgdXAgb2ZmaW5lIFhlbkRldmljZSBvYmplY3RzIGRpcmVjdGx5IGluDQo+ID4gICAg ICAgICAgICAgICBeIG9mZmxpbmUNCj4gPg0KPiA+ID4geGVuX2RldmljZV9iYWNrZW5kX2NoYW5n ZWQoKSBpcyBkYW5nZXJvdXMgYXMgeGVuX2RldmljZV91bnJlYWxpemUoKSB3aWxsDQo+ID4gPiBt b2RpZnkgdGhlIHdhdGNoIGxpc3QgdGhhdCBpcyBiZWluZyB3YWxrZWQuIEV2ZW4gdGhlIFFMSVNU X0ZPUkVBQ0hfU0FGRSgpDQo+ID4gPiB1c2VkIGluIG5vdGlmaWVyX2xpc3Rfbm90aWZ5KCkgaXMg aW5zdWZmaWNpZW50IGFzICp0d28qIG5vdGlmaWVycyAoZm9yDQo+ID4gPiB0aGUgZnJvbnRlbmQg YW5kIGJhY2tlbmQgd2F0Y2hlcykgYXJlIHJlbW92ZWQsIHRodXMgcG90ZW50aWFsbHkgcmVuZGVy aW5nDQo+ID4gPiB0aGUgJ25leHQnIHBvaW50ZXIgdW5zYWZlLg0KPiA+ID4NCj4gPiA+IFRoZSBz b2x1dGlvbiBpcyB0byB1c2UgdGhlIFhlbkJ1cyBiYWNrZW5kX3dhdGNoIGhhbmRsZXIgdG8gZG8g dGhlIGNsZWFuLXVwDQo+ID4gPiBpbnN0ZWFkLCBhcyBpdCBpcyBpbnZva2VkIHdoaWxzdCB3YWxr aW5nIGEgc2VwYXJhdGUgd2F0Y2ggbGlzdC4NCj4gPiA+DQo+ID4gPiBUaGlzIHBhdGNoIHRoZXJl Zm9yZSBhZGRzIGEgbmV3ICdvZmZsaW5lX2RldmljZXMnIGxpc3QgdG8gWGVuQnVzLCB0byB3aGlj aA0KPiA+ID4gb2ZmbGluZSBkZXZpY2VzIGFyZSBhZGRlZCBieSB4ZW5fZGV2aWNlX2JhY2tlbmRf Y2hhbmdlZCgpLiBUaGUgWGVuQnVzDQo+ID4gPiBiYWNrZW5kX3dhdGNoIHJlZ2lzdHJhdGlvbiBp cyBhbHNvIGNoYW5nZWQgdG8gbm90IG9ubHkgaW52b2tlDQo+ID4gPiB4ZW5fYnVzX2VudW1lcmF0 ZSgpIGJ1dCBhbHNvIGEgbmV3IHhlbl9idXNfY2xlYW51cCgpIGZ1bmN0aW9uLCB3aGljaCB3aWxs DQo+ID4gPiB3YWxrICdvZmZsaW5lX2RldmljZXMnIGFuZCBwZXJmb3JtIHRoZSBuZWNlc3Nhcnkg YWN0aW9ucy4NCj4gPiA+IEZvciBzYWZldHkgYSBhbiBleHRyYSAnb25saW5lJyBjaGVjayBpcyBh bHNvIGFkZGVkIHRvDQo+ID4gICAgICAgICAgICAgIF4gb25lICdhJyB0b28gbWFueT8NCj4gPg0K PiA+ID4geGVuX2J1c190eXBlX2VudW1lcmF0ZSgpIHRvIG1ha2Ugc3VyZSB0aGF0IG5vIGF0dGVt cHQgaXMgbWFkZSB0byBjcmVhdGUgYQ0KPiA+ID4gbmV3IFhlbkRldmljZSBvYmplY3QgZm9yIGEg YmFja2VuZCB0aGF0IGlzIG9mZmxpbmUuDQo+ID4gPg0KPiA+ID4gTk9URTogVGhpcyBwYXRjaCBh bHNvIGluY2x1ZGUgc29tZSBjb3NtZXRpYyBjaGFuZ2VzOg0KPiA+ID4gICAgICAgLSBzdWJzdGl0 dXRlIHRoZSBsb2NhbCB2YXJpYWJsZSBuYW1lICdiYWNrZW5kX3N0YXRlJw0KPiA+ID4gICAgICAg ICBpbiB4ZW5fYnVzX3R5cGVfZW51bWVyYXRlKCkgd2l0aCAnc3RhdGUnLCBzaW5jZSB0aGVyZQ0K PiA+ID4gICAgICAgICBpcyBubyBhbWJpZ3VpdHkgd2l0aCBhbnkgb3RoZXIgc3RhdGUgaW4gdGhh dCBjb250ZXh0Lg0KPiA+ID4gICAgICAgLSBjaGFuZ2UgeGVuX2RldmljZV9zdGF0ZV9pc19hY3Rp dmUoKSB0bw0KPiA+ID4gICAgICAgICB4ZW5fZGV2aWNlX2Zyb250ZW5kX2lzX2FjdGl2ZSgpIChh bmQgcGFzcyBhIFhlbkRldmljZSBkaXJlY3RseSkNCj4gPiA+ICAgICAgICAgc2luY2UgdGhlIHN0 YXRlIHRlc3RzIGNvbnRhaW5lZCB0aGVyZWluIG9ubHkgYXBwbHkgdG8gYSBmcm9udGVuZC4NCj4g PiA+ICAgICAgIC0gdXNlICdzdGF0ZScgcmF0aGVyIHRoZW4gJ3hlbmRldi0+YmFja2VuZF9zdGF0 ZScgaW4NCj4gPiA+ICAgICAgICAgeGVuX2RldmljZV9iYWNrZW5kX2NoYW5nZWQoKSB0byBzaG9y dGVuIHRoZSBjb2RlLg0KPiA+ID4NCj4gPiA+IFNpZ25lZC1vZmYtYnk6IFBhdWwgRHVycmFudCA8 cGF1bC5kdXJyYW50QGNpdHJpeC5jb20+DQo+ID4gPiAtLS0NCj4gPiA+DQo+ID4gPiB2MjoNCj4g PiA+ICAtIE1ha2Ugc3VyZSB3ZSBkb24ndCB0cnkgdG8gYWRkIGEgWGVuRGV2aWNlIHRvICdvZmZs aW5lX2RldmljZXMnIG1vcmUgdGhhbg0KPiA+ID4gICAgb25jZQ0KPiA+ID4gLS0tDQo+ID4gPg0K PiA+ID4gICAgICAvKg0KPiA+ID4gICAgICAgKiBJZiBhIGJhY2tlbmQgaXMgc3RpbGwgJ29ubGlu ZScgdGhlbiB3ZSBzaG91bGQgbGVhdmUgaXQgYWxvbmUgYnV0LA0KPiA+ID4gLSAgICAgKiBpZiBh IGJhY2tlbmQgaXMgbm90ICdvbmxpbmUnLCB0aGVuIHRoZSBkZXZpY2Ugc2hvdWxkIGJlIGRlc3Ry b3llZA0KPiA+ID4gLSAgICAgKiBvbmNlIHRoZSBzdGF0ZSBpcyBDbG9zZWQuDQo+ID4gPiArICAg ICAqIGlmIGEgYmFja2VuZCBpcyBub3QgJ29ubGluZScsIHRoZW4gdGhlIGRldmljZSBpcyBhIGNh bmRpZGF0ZQ0KPiA+ID4gKyAgICAgKiBmb3IgZGVzdHJ1Y3Rpb24uIEhlbmNlIGFkZCBpdCB0byB0 aGUgJ29mZmxpbmUnIGxpc3QgdG8gYmUgY2xlYW5lZA0KPiA+ID4gKyAgICAgKiBieSB4ZW5fYnVz X2NsZWFudXAoKS4NCj4gPiA+ICAgICAgICovDQo+ID4gPiAtICAgIGlmICgheGVuZGV2LT5iYWNr ZW5kX29ubGluZSAmJg0KPiA+ID4gLSAgICAgICAgKHhlbmRldi0+YmFja2VuZF9zdGF0ZSA9PSBY ZW5idXNTdGF0ZUNsb3NlZCB8fA0KPiA+ID4gLSAgICAgICAgIHhlbmRldi0+YmFja2VuZF9zdGF0 ZSA9PSBYZW5idXNTdGF0ZUluaXRpYWxpc2luZyB8fA0KPiA+ID4gLSAgICAgICAgIHhlbmRldi0+ YmFja2VuZF9zdGF0ZSA9PSBYZW5idXNTdGF0ZUluaXRXYWl0IHx8DQo+ID4gPiAtICAgICAgICAg eGVuZGV2LT5iYWNrZW5kX3N0YXRlID09IFhlbmJ1c1N0YXRlVW5rbm93bikpIHsNCj4gPiA+IC0g ICAgICAgIEVycm9yICpsb2NhbF9lcnIgPSBOVUxMOw0KPiA+ID4gKyAgICBpZiAoIW9ubGluZSAm Jg0KPiA+ID4gKyAgICAgICAgKHN0YXRlID09IFhlbmJ1c1N0YXRlQ2xvc2VkIHx8ICBzdGF0ZSA9 PSBYZW5idXNTdGF0ZUluaXRpYWxpc2luZyB8fA0KPiA+ID4gKyAgICAgICAgIHN0YXRlID09IFhl bmJ1c1N0YXRlSW5pdFdhaXQgfHwgc3RhdGUgPT0gWGVuYnVzU3RhdGVVbmtub3duKSAmJg0KPiA+ ID4gKyAgICAgICAgIVFMSVNUX05FWFQoeGVuZGV2LCBsaXN0KSkgew0KPiA+DQo+ID4gQ291bGQg eW91IGFkZCBhIG5vdGUgYWJvdXQgdGhpcyBRTElTVF9ORVhUPyBJIGRvbid0IHRoaW5rIGl0J3Mg Z29pbmcgdG8NCj4gPiBiZSBvYnZpb3VzIGVub3VnaCB3aHkgd2UgY2hlY2sgdGhhdCB0aGVyZSBh cmUgbm8gbmV4dCBpdGVtLiBJIG1pZ2h0IG9ubHkNCj4gPiB1bmRlcnN0YW5kIGl0IGp1c3QgYmVj YXVzZSBvZiB5b3VyIHJlcGx5IHRvIHRoZSB2MSBvZiB0aGUgcGF0Y2guDQo+ID4gKFdlbGwgdGhl IGNoYW5nZWxvZyBvZiB0aGUgcGF0Y2ggYWxzbyBwb2ludCBvdXQgd2hhdCBpdCdzIGZvci4pDQo+ ID4NCj4gDQo+IFN1cmUsIGl0J3Mgd29ydGggYSBjb21tZW50Lg0KDQpBY3R1YWxseSwgb24gY2xv c2VyIGluc3BlY3Rpb24gIVFMSVNUX05FWFQoKSBpcyBhbiBpbnN1ZmZpY2llbnQgY2hlY2tlZC4g SSBoYWQgYXNzdW1lZCB0aGF0IFFMSVNUcyB3ZXJlIGZ1bGwgZG91Ymx5LWxpbmtlZCBsaXN0cyBi dXQgdGhleSBhcmUgbm90OyB0aGUgbGFzdCBlbGVtZW50IG9uIGEgbGlzdCB3aWxsIHN0aWxsIGhh dmUgYSBOVUxMIG5leHQgcG9pbnRlci4gSXQgd2lsbCBiZSBzdWZmaWNpZW50LCBhbmQgYWxzbyBj bGVhcmVyIHRvIHRoZSByZWFkZXIsIGlmIEkgYWRkIGEgYm9vbGVhbiB0byBYZW5EZXZpY2Ugd2hp Y2ggaXMgc2V0IHdoZW4gaXQgaXMgYWRkZWQgdG8gdGhlIGxpc3QuDQoNCiAgUGF1bA0K