From nobody Fri Mar 29 05:50:20 2024 Delivered-To: importer@patchew.org Received-SPF: pass (zohomail.com: domain of lists.xenproject.org designates 192.237.175.120 as permitted sender) client-ip=192.237.175.120; envelope-from=xen-devel-bounces@lists.xenproject.org; helo=lists.xenproject.org; Authentication-Results: mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of lists.xenproject.org designates 192.237.175.120 as permitted sender) smtp.mailfrom=xen-devel-bounces@lists.xenproject.org; dmarc=pass(p=quarantine dis=none) header.from=suse.com ARC-Seal: i=1; a=rsa-sha256; t=1619701834; cv=none; d=zohomail.com; s=zohoarc; b=OS+yVbPUO47xZo3YjBtuLJRXMkIw4C72uCFtOzVoWtL3DacWqktQ8cMBLa49pilQmzuiz0d788ClVufQLw+30U4C49EaYg+bEA8VYOUtfANk7KML0x8yF9y0o26bzQZVrX9CiCReDxbk8wkwh784JIu1ASL6zPHgj6Lw+ZeA5fA= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1619701834; h=Content-Type:Content-Transfer-Encoding:Cc:Date:From:List-Subscribe:List-Post:List-Id:List-Help:List-Unsubscribe:MIME-Version:Message-ID:Sender:Subject:To; bh=3k+xAgvQZtJpxfl3IYt7nqtMgLjyZZ2LoR7FStHB82k=; b=YAZJMZpKxtJO4G27TsTgOmoMHNUhy4ou5VGw44j/v08qJ4xTu8FA2H27HG9GZHPTzOwmM+IfwnGOOT9LjReg2Byn69fEMTNCSILmo8X2ijZwr+Mo1012YYOTonH9hJR0wXb7bZvhbvkjyHwNS22GrM3aSS7xxzh6G79+IjJq42E= ARC-Authentication-Results: i=1; mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of lists.xenproject.org designates 192.237.175.120 as permitted sender) smtp.mailfrom=xen-devel-bounces@lists.xenproject.org; dmarc=pass header.from= (p=quarantine dis=none) header.from= Return-Path: Received: from lists.xenproject.org (lists.xenproject.org [192.237.175.120]) by mx.zohomail.com with SMTPS id 1619701834043745.8637474240682; Thu, 29 Apr 2021 06:10:34 -0700 (PDT) Received: from list by lists.xenproject.org with outflank-mailman.119987.226860 (Exim 4.92) (envelope-from ) id 1lc6Qk-00015I-Ld; Thu, 29 Apr 2021 13:10:10 +0000 Received: by outflank-mailman (output) from mailman id 119987.226860; Thu, 29 Apr 2021 13:10:10 +0000 Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1lc6Qk-00015B-I2; Thu, 29 Apr 2021 13:10:10 +0000 Received: by outflank-mailman (input) for mailman id 119987; Thu, 29 Apr 2021 13:10:09 +0000 Received: from all-amaz-eas1.inumbo.com ([34.197.232.57] helo=us1-amaz-eas2.inumbo.com) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1lc6Qj-000154-Hm for xen-devel@lists.xenproject.org; Thu, 29 Apr 2021 13:10:09 +0000 Received: from mx2.suse.de (unknown [195.135.220.15]) by us1-amaz-eas2.inumbo.com (Halon) with ESMTPS id 57ebc86c-7861-4f11-baf3-d3c0bd0e841c; Thu, 29 Apr 2021 13:10:08 +0000 (UTC) Received: from relay2.suse.de (unknown [195.135.221.27]) by mx2.suse.de (Postfix) with ESMTP id 44ED5B12E; Thu, 29 Apr 2021 13:10:07 +0000 (UTC) X-Outflank-Mailman: Message body and most headers restored to incoming version X-BeenThere: xen-devel@lists.xenproject.org List-Id: Xen developer discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: xen-devel-bounces@lists.xenproject.org Precedence: list Sender: "Xen-devel" X-Inumbo-ID: 57ebc86c-7861-4f11-baf3-d3c0bd0e841c X-Virus-Scanned: by amavisd-new at test-mx.suse.de DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=susede1; t=1619701807; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding; bh=3k+xAgvQZtJpxfl3IYt7nqtMgLjyZZ2LoR7FStHB82k=; b=Le3PWrken0cEVs2Q+FgPVAceMIZKGAfJutSJh62jPcpFRqw1p7HNreE7n9VVm9AXctIL83 qTjsgFFIG85JrQDfasiLZyIpI6Kd061rNo9E2qQx284XO4bb0QuWOD3nWjOr3o2ne5DvIb ekpDDjz9GTg9jZx6G3L1ddDgkhYLACs= To: "xen-devel@lists.xenproject.org" Cc: Andrew Cooper , George Dunlap , Ian Jackson , Julien Grall , Stefano Stabellini , Wei Liu , Luca Fancellu From: Jan Beulich Subject: [PATCH] public/gnttab: relax v2 recommendation Message-ID: Date: Thu, 29 Apr 2021 15:10:06 +0200 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:78.0) Gecko/20100101 Thunderbird/78.10.0 MIME-Version: 1.0 Content-Language: en-US Content-Transfer-Encoding: quoted-printable X-ZohoMail-DKIM: pass (identity @suse.com) Content-Type: text/plain; charset="utf-8" With there being a way to disable v2 support, telling new guests to use v2 exclusively is not a good suggestion. Signed-off-by: Jan Beulich Reviewed-by: Luca Fancellu --- a/xen/include/public/grant_table.h +++ b/xen/include/public/grant_table.h @@ -121,8 +121,10 @@ typedef uint32_t grant_ref_t; */ =20 /* - * Version 1 of the grant table entry structure is maintained purely - * for backwards compatibility. New guests should use version 2. + * Version 1 of the grant table entry structure is maintained largely for + * backwards compatibility. New guests are recommended to support using + * version 2 to overcome version 1 limitations, but to be able to fall back + * to version 1. */ #if __XEN_INTERFACE_VERSION__ < 0x0003020a #define grant_entry_v1 grant_entry