Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18;
Date:   Wed, 7 Jul 2021 20:58:22 -0300
From:   Jason Gunthorpe <jgg@nvidia.com>
To:     "Raj, Ashok" <ashok.raj@intel.com>
Cc:     Thomas Gleixner <tglx@linutronix.de>,
        "Dey, Megha" <megha.dey@intel.com>, linux-kernel@vger.kernel.org,
        "Jiang, Dave" <dave.jiang@intel.com>,
        "Tian, Kevin" <kevin.tian@intel.com>,
        "Pan, Jacob jun" <jacob.jun.pan@intel.com>,
        "Liu, Yi L" <yi.l.liu@intel.com>,
        "Kumar, Sanjay K" <sanjay.k.kumar@intel.com>,
        "Van De Ven, Arjan" <arjan.van.de.ven@intel.com>,
        "Williams, Dan J" <dan.j.williams@intel.com>,
        "Shankar, Ravi V" <ravi.v.shankar@intel.com>
Subject: Re: Programming PASID in IMS entries
Message-ID: <20210707235822.GB4459@nvidia.com>
References: <bd509e3d-f59d-1200-44ce-93cf9132bd8c@intel.com>
 <87k0m2qzgz.ffs@nanos.tec.linutronix.de>
 <20210707221216.GA56594@otc-nc-03>
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <20210707221216.GA56594@otc-nc-03>
MIME-Version: 1.0
X-MS-Exchange-MessageSentRepresentingType: 1
Received: from mlx.ziepe.ca (47.55.113.94) by BL0PR01CA0008.prod.exchangelabs.com (2603:10b6:208:71::21) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.4308.20 via Frontend Transport; Wed, 7 Jul 2021 23:58:23 +0000
Received: from jgg by mlx with local (Exim 4.94)        (envelope-from <jgg@nvidia.com>)        id 1m1HQs-00630c-U3; Wed, 07 Jul 2021 20:58:22 -0300
X-MS-PublicTrafficType: Email
X-MS-Office365-Filtering-Correlation-Id: 39cc934f-7963-469d-adbb-08d941a31b11
X-MS-TrafficTypeDiagnostic: BL1PR12MB5047:
X-Microsoft-Antispam-PRVS: <BL1PR12MB5047B9B972E6E8EB3545E21FC21A9@BL1PR12MB5047.namprd12.prod.outlook.com>
X-MS-Oob-TLC-OOBClassifiers: OLM:7219;
X-MS-Exchange-SenderADCheck: 1
X-Microsoft-Antispam: BCL:0;
X-Microsoft-Antispam-Message-Info: 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
X-Forefront-Antispam-Report: CIP:255.255.255.255;CTRY:;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:BL0PR12MB5506.namprd12.prod.outlook.com;PTR:;CAT:NONE;SFS:(4636009)(366004)(136003)(39860400002)(346002)(376002)(396003)(38100700002)(186003)(8676002)(6916009)(9746002)(9786002)(4326008)(5660300002)(478600001)(83380400001)(33656002)(8936002)(316002)(66556008)(36756003)(66476007)(7416002)(2906002)(26005)(54906003)(2616005)(1076003)(66946007)(426003)(86362001);DIR:OUT;SFP:1101;
X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1
X-MS-Exchange-AntiSpam-MessageData-0: =?us-ascii?Q?zgu6w8IwMZK7f38zxA76iptdYPvyJ4kilJ5XRVL/128z6ZQdw/xgsiJT9muj?=
 =?us-ascii?Q?mw2fI/fMRwapDjQC7dMq/desZWbvPpaEQgYkc0J1qbv285RQvySySCzjgp2U?=
 =?us-ascii?Q?AB55OnlIcgBVM9js7vENIwCzy9Iw49fXVNr3/72HSOmQF/i1CABMmoLWhlir?=
 =?us-ascii?Q?Cxcn79926ntfSaSU9BsPtjdNcYOYo3Y36sortaQsBRyKoZGH2+sQcAv1JpNb?=
 =?us-ascii?Q?1D4hjZY4WAuilVB+S5qtf+uEqO5QxvMFh6DLTY7g4W7zbQWzKX492FAobN/A?=
 =?us-ascii?Q?G0+5xAo91T4Q9RtA2gylBTAxgafjdfN5ftpmzymC69P3TOKwI1K/dKg/iFsm?=
 =?us-ascii?Q?FxaCpjyBy2s810TtBWwuIFjNcOIOu9GZ3C96r/fVSt7oU6DOPIZ7klM84RuS?=
 =?us-ascii?Q?uG1+Bq7+8YF0HJaI6Yx/DEB3tnzVVji1ZRgB+ssF6avxBYEQCycxAyimmcSU?=
 =?us-ascii?Q?wcIvdfyJw2Pfzr2pn/daCE2O6F/R2y/zgxbUcxLpk48VPtcjpCVxv5uE/vYc?=
 =?us-ascii?Q?rjvTHuugLG0yiwXv5CZpnip4lgsbUlVdoMzDGxXDplwx6n8Q9lDUbJGvl+xp?=
 =?us-ascii?Q?hallQhkZxm4cxBY+RrEEEd/ChSPiPZH4HzS8w7hJCkNqaldU8euTdzhywUCE?=
 =?us-ascii?Q?WgvWeqRy5he7m9kpv8J6GM2U7wFDOMeNwF973+7hapLfX7GMBA3T6f+Bg2na?=
 =?us-ascii?Q?zmzL8vYd0jTh/6cSQxfwTxyRNFkPf8QrPi2chHY0xEx0IQXtPhQl3cri3hB3?=
 =?us-ascii?Q?fxICs3xas22BqioxpnxUM+Q7ED4mGPAyxxHlaHnp5F1mx8/nRq/bzomptQjB?=
 =?us-ascii?Q?uV+/5TTYyVHeVzWNPWDkvBXM+qpmbB9kodHDAj6gbzlggBIKkIFDt6UCIfPt?=
 =?us-ascii?Q?FdcMyBfZ2B1sP7PBuOgn859myEItIgiF+6knLDo7bS7iI7tBsBjb6+wmUt/o?=
 =?us-ascii?Q?6DdzqIF/E+OpF1BFsSciX+b/d2xX9IftqdciGB3SyUJ6HhrwhsHE6JTrO4M/?=
 =?us-ascii?Q?KgxOQL70fMwW9iIk6yCcFmwe/kXr1WRTsuCp6i6earf34lDPCkjeYJMZkg63?=
 =?us-ascii?Q?dkCcI3fFqI5qxAu6d3DjYpDS/41M77K+9rwc7NaCScMYdvit+crcQRC2noT/?=
 =?us-ascii?Q?sR+2yVcb8kRj33hgoiFNRSfAXZUH3v0Cm0h3z4IKVQX/GYKtHKISj3Exrxqx?=
 =?us-ascii?Q?laiPXdjyQjD9sCs2psDPz+VnYbXqNr2duKHOPKTympTnkVMzrdqxgfsxWM7p?=
 =?us-ascii?Q?iD2Jyg8VFj6ec+fmFcP3/Uydmxj+1MU8y2Z0fXuhAXqxTMhZ7D3Dshdoq/SV?=
 =?us-ascii?Q?MOXOGpMHR6DJGJP+xjqb8Q0x?=
X-OriginatorOrg: Nvidia.com
X-MS-Exchange-CrossTenant-Network-Message-Id: 39cc934f-7963-469d-adbb-08d941a31b11
X-MS-Exchange-CrossTenant-AuthSource: BL0PR12MB5506.namprd12.prod.outlook.com
X-MS-Exchange-CrossTenant-AuthAs: Internal
X-MS-Exchange-CrossTenant-OriginalArrivalTime: 07 Jul 2021 23:58:24.0169
 (UTC)
X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted
X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a
X-MS-Exchange-CrossTenant-MailboxType: HOSTED
X-MS-Exchange-CrossTenant-UserPrincipalName: T1SyvJ/kzoItQ9C21Db5IPtMzpZcEihECJ0/+C9fgoqwC5lgIdPvg65qcmf07JdE
X-MS-Exchange-Transport-CrossTenantHeadersStamped: BL1PR12MB5047
Precedence: bulk
List-ID: <linux-kernel.vger.kernel.org>
X-Mailing-List: linux-kernel@vger.kernel.org

On Wed, Jul 07, 2021 at 03:12:16PM -0700, Raj, Ashok wrote:
> Hi Thomas
> 
> On Wed, Jul 07, 2021 at 10:50:52AM +0200, Thomas Gleixner wrote:
> > Megha,
> > 
> > On Wed, Jul 07 2021 at 09:49, Megha Dey wrote:
> > > Per your suggestions during the last meeting, we wanted to confirm the 
> > > sequence to program the PASID into the IMS entries:
> > >
> > > 1. Add a PASID member to struct msi_desc (Add as part of a union. Other 
> > > source-id's such as Jason's vm-id can be added to it)
> > 
> > Yes. Though we also discussed storing the default PASID in struct device
> > to begin with which is then copied to the msi_desc entries during
> > allocation.
> 
> Using default PASID in struct device will work for sub-devices until the
> guest needs to enable ENQCMD support. Since the guest kernel can ask for an
> interrupt by specifying something in the descriptor submitted via ENQCMD.
> Using the PASID in struct device won't be sufficient.

Could you could store a pasid table in the struct device and index it
by vector?

Jason