Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:18 as permitted sender) client-ip=2620:137:e000::1:18;
Message-ID: <51a1761f-9852-d064-05fc-0a98a8304506@oracle.com>
Date:   Thu, 5 May 2022 20:12:20 -0400
User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:91.0)
 Gecko/20100101 Thunderbird/91.8.1
Subject: Re: [PATCH v3 00/21] xen: simplify frontend side ring setup
Content-Language: en-US
To:     Juergen Gross <jgross@suse.com>, xen-devel@lists.xenproject.org,
        linux-kernel@vger.kernel.org, linux-block@vger.kernel.org,
        netdev@vger.kernel.org, linux-scsi@vger.kernel.org,
        linux-usb@vger.kernel.org, dri-devel@lists.freedesktop.org,
        linux-integrity@vger.kernel.org, linux-pci@vger.kernel.org
Cc:     Stefano Stabellini <sstabellini@kernel.org>,
        =?UTF-8?Q?Roger_Pau_Monn=c3=a9?= <roger.pau@citrix.com>,
        Jens Axboe <axboe@kernel.dk>,
        "David S. Miller" <davem@davemloft.net>,
        Eric Dumazet <edumazet@google.com>,
        Jakub Kicinski <kuba@kernel.org>,
        Paolo Abeni <pabeni@redhat.com>,
        "James E.J. Bottomley" <jejb@linux.ibm.com>,
        "Martin K. Petersen" <martin.petersen@oracle.com>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Oleksandr Andrushchenko <oleksandr_andrushchenko@epam.com>,
        David Airlie <airlied@linux.ie>,
        Daniel Vetter <daniel@ffwll.ch>,
        Jaroslav Kysela <perex@perex.cz>,
        Takashi Iwai <tiwai@suse.com>, alsa-devel@alsa-project.org,
        Peter Huewe <peterhuewe@gmx.de>,
        Jarkko Sakkinen <jarkko@kernel.org>,
        Jason Gunthorpe <jgg@ziepe.ca>,
        Bjorn Helgaas <bhelgaas@google.com>
References: <20220505081640.17425-1-jgross@suse.com>
From:   Boris Ostrovsky <boris.ostrovsky@oracle.com>
In-Reply-To: <20220505081640.17425-1-jgross@suse.com>
Content-Type: text/plain; charset=UTF-8; format=flowed
Content-Transfer-Encoding: 7bit
MIME-Version: 1.0
X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1
X-MS-Exchange-AntiSpam-MessageData-0: =?utf-8?B?bytxaFk4Q0FGZ3RvTFZZOExlOHpOc3dyUzNXKzNOWExOT1d3R0Z0UTN0OU1s?=
 =?utf-8?B?c1lpRTMyZVpPUHNpSFIxQVZOTjhnSmdGTWJCM0txMm9XSUlHUjJSNEtVVGhy?=
 =?utf-8?B?QnNRcVlIYzZOVHM1R0lFQTRaQm8wNnprSCtwWGtvTnVSRjJDemJ2RW1YcHNl?=
 =?utf-8?B?ZW9henBhbkN1NTlrZjRyUHJWNWRpSTZndnpZb3luQUFFTWlyMW1UNmRsUWdZ?=
 =?utf-8?B?dFVZbStXalhxNkFmSEZ1UDQyT3VOb21nUWRhZ1hKT09zNENYQkczYkZNUTFq?=
 =?utf-8?B?Rm1aQzRvOS9NejdDZU1hcDE3dGwzRFp2dytVVTNyZW5ob3gwTlRCZWkwblZa?=
 =?utf-8?B?N0dxRElvMnlUYXd1aGxzYVNEekVrQ0Ywa01ueXBwMk5HQjVmbUt1b3h6KzF3?=
 =?utf-8?B?K2tIL0V1ek1sWXpiY2c1NUhIM1BRQ1JPbDZwSzVnZDFjakF4TDJLdTFpV0hz?=
 =?utf-8?B?OUR1RnZ6QzJOa1NlKzRLdUlqblExMXNTYVhjM1hWZUN2R3NEcDZITkJKaXBa?=
 =?utf-8?B?aHczTXpuS2F2bG15TlJpdWgwQXl4WXhXYk90WkpISmZ1QmExRmM3dlZCUHRQ?=
 =?utf-8?B?U1prSXNBc2lONWQxN3V1elI3cW1yWGFzNDd4d3hQMmZvTktJa2R0VGxtMXo3?=
 =?utf-8?B?VDNESzVLQkhaeWZXL211ZHhCWWUxZkdFbVhBNUNSeXZSY0s3OVFmZng0UWZn?=
 =?utf-8?B?R1BnYlRBbGJkZWd5RUY0alFWZDk0Qy96QmdNZHdGYjRiaVRJdWh0K3lqRDJp?=
 =?utf-8?B?WWRBTStQeW9wOGZxU0VYTVEyYndhQ0MzUU5OYkFiekp0WTBucm9NMEI0MW9J?=
 =?utf-8?B?QVZwaDJEeElIL1ZVaDZFcXJ3eS9XTEdUV2REeHhJZXFBN1doUDBqZVUzQmU1?=
 =?utf-8?B?bjg4RlhKNnRNbEN2UERkL0Fsc0QxditCM3lvNmJoK2ZsaGUxSi83by9wTzNi?=
 =?utf-8?B?SFh4TmFZNkhjUUp3SSszY2Y3ZzBGOG9uamY1bkNPS2Z2Y1F4MXZXME0wak9K?=
 =?utf-8?B?Z3lvdjNiVVMwVmNkbXZYdW93WXZZZDRwYkMvV3BRWkdrODVmOWwyRXVib0Jt?=
 =?utf-8?B?Nm5rY1lkR21BT05QRTA4SE9POVk0VGZkdFIxZ0N3VjRpVWF6Q0x4a2ZyZkho?=
 =?utf-8?B?UDVibWI1d3N5SUVaS1RleCtNSmJRVE1zSnhaV0FIT0Rkb1gxendEOWRQK2ds?=
 =?utf-8?B?TUI4Rm0zS0JOTk9YeFBHUE9YMFdINGJJK2k4bWcyZnRFR3FyMGJRY1ppL3Ru?=
 =?utf-8?B?SVlrdTdnTnFtK1RsL1BEMTF4dGZPMDQybW4rSTdBY1JjeVdPd3VQK2RCc3Ix?=
 =?utf-8?B?ZzhEejQyeERpaitjOEJKZjVjdzVsUG5ac1I2OHRCOXFDVXFrV1VZVVdHcm5S?=
 =?utf-8?B?R2luVlJqUllRVGhwNFowK3lPd1BvNnorZHdrOE91RW9XQWxvWElDdTh1NXBQ?=
 =?utf-8?B?NjdaNC83QkRNbFFyWHhJQU5EM3hGOVZjVWEzek9TVE96TGZPQUtmeldrT0o3?=
 =?utf-8?B?cW9ZeUd0RnMvUDMrR3JLT2VLSjVodEpZc1V3d1dDRnpoL1JsbmJBbGtaTDMw?=
 =?utf-8?B?dXkvb0Z5ZGw2WmhiZUIwTFVJUEF3NnE1SXBKQkEyYkJsZXlZaEoyVFlEcDZY?=
 =?utf-8?B?TURXcEc5WmthUy9jTUlURGJEMExxaFoxUlVsOE9aTlh6LzdyVUxsSXpxbCtz?=
 =?utf-8?B?aXhFMnl2eWlMRzY2d3NMdXR5S21pby9DS1NPQnh0ZCtNTWdFb0x0WmZtcmFn?=
 =?utf-8?B?MUR4SUNhOUhacjErWVRQYnE0OHFoTnNYQW1DUy92OUZxWExpakRWSkVkYU5I?=
 =?utf-8?B?REMwSFZqQ2NzQ2dYdGNkK3Q2SkNSdzRLVEh4YklFZ0Vlb0xOVWNvbXdtWmhV?=
 =?utf-8?B?VUZWb3oxdGZtQzdHbS8rSndRKzBqYXk3MXRyVGtwR3JkUG4vMzdjcG1RS3Fy?=
 =?utf-8?B?V0JoM0xUb3FCbEFIVS9saWg4NVdyU3lVZmw4ZmlTdlhHcG55eXpkWnFmZFVT?=
 =?utf-8?B?NXVIYUhMeGpEby9jaGpDVzNXOGFBckREUWllTVRyZVR1T3EvQ2txN2V2WXZy?=
 =?utf-8?B?eDVSY2Q3TStMTmtueExsZ1NsT0FjV0cvNVArT1FPRDJINW5ETUJuUlBEZnRs?=
 =?utf-8?B?cDZsdWcwSzNUZ3B5TFgzTXB2SzNvRmwxVWwvNGF1SGxUL1FFcEZSaS8wRFB0?=
 =?utf-8?B?NzdzUUpKdG9IR2puWUVORkFFcWVNRUl4dUovMlNkYUVpbWg0cHBaMkdHZmFE?=
 =?utf-8?B?dDM3dUJuSFUxenJVaGRpR0dOb3VwbWVmSFQ0Vk9GUkNzdnp1SmZncXliKzhh?=
 =?utf-8?B?OUN5dVE0QVVqckVWcXJnanRxVEduckVnZTJnTUx2WFhnL3hjWEMxNWRYRHcw?=
 =?utf-8?Q?sdsvwoAp5hbzZW54=3D?=
X-OriginatorOrg: oracle.com
X-MS-Exchange-CrossTenant-Network-Message-Id: 14e0a6ac-6d3e-4b08-5c4a-08da2ef51bc6
X-MS-Exchange-CrossTenant-AuthSource: BLAPR10MB5009.namprd10.prod.outlook.com
X-MS-Exchange-CrossTenant-AuthAs: Internal
X-MS-Exchange-CrossTenant-OriginalArrivalTime: 06 May 2022 00:12:29.4977
 (UTC)
X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted
X-MS-Exchange-CrossTenant-Id: 4e2c6054-71cb-48f1-bd6c-3a9705aca71b
X-MS-Exchange-CrossTenant-MailboxType: HOSTED
X-MS-Exchange-CrossTenant-UserPrincipalName: hYulAuZhXmK5BaUUYMzlV9HQeCTsYoFltdGk+LDG0YX9O3CRYmG/rGitCA3acrGEhNhjaRQ/jwbjgosZ9KigRlxLMXlok9CDeFxtmfhZRiU=
X-MS-Exchange-Transport-CrossTenantHeadersStamped: BN8PR10MB3153
X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.486,18.0.858
 definitions=2022-05-05_10:2022-05-05,2022-05-05 signatures=0
X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 adultscore=0 bulkscore=0 malwarescore=0
 spamscore=0 mlxlogscore=999 mlxscore=0 suspectscore=0 phishscore=0
 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2202240000
 definitions=main-2205050153
X-Proofpoint-GUID: XWU0bMd3BhK7XLGpuB-x1jMxs1RfxYRX
X-Proofpoint-ORIG-GUID: XWU0bMd3BhK7XLGpuB-x1jMxs1RfxYRX
X-Spam-Status: No, score=-3.1 required=5.0 tests=BAYES_00,DKIM_SIGNED,
	DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,
	MAILING_LIST_MULTI,NICE_REPLY_A,RDNS_NONE,SPF_HELO_NONE,
	T_SCC_BODY_TEXT_LINE autolearn=unavailable autolearn_force=no
	version=3.4.6
X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on
	lindbergh.monkeyblade.net
Precedence: bulk
List-ID: <linux-kernel.vger.kernel.org>
X-Mailing-List: linux-kernel@vger.kernel.org


On 5/5/22 4:16 AM, Juergen Gross wrote:
> Many Xen PV frontends share similar code for setting up a ring page
> (allocating and granting access for the backend) and for tearing it
> down.
>
> Create new service functions doing all needed steps in one go.
>
> This requires all frontends to use a common value for an invalid
> grant reference in order to make the functions idempotent.
>
> Changes in V3:
> - new patches 1 and 2, comments addressed
>
> Changes in V2:
> - new patch 9 and related changes in patches 10-18


For the patches that I was explicitly copied on:


Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>