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SRVR:BYAPR18MB3031; H:BYAPR18MB2424.namprd18.prod.outlook.com; FPR:; SPF:None; LANG:en; PTR:InfoNoRecords; A:1; MX:1; received-spf: None (protection.outlook.com: marvell.com does not designate permitted sender hosts) x-ms-exchange-senderadcheck: 1 x-microsoft-antispam-message-info: 8Jw3bSoyyz8wTmIdQAh2hVhYfw7LeqKp81wOPu9i5OxK7vW9cOiG2YxWDKgUFPYpjEd/96HRgFYd7VzeUyw9H0Lhfl4NWChaCQy6q4oo+9N+MjufD1lBZiDnnCSfqpXXMgv//zC6c5bu9kck+OjYF97/fyNAlNfH7V2agt8NnndvRk0DENvMo0T8f8JWxH8O6EUXsZk+Lx2VKlHiTqgvrk/QKJqwAFW9n1oMSsmrrFOVqrWszIYYw+xuaIwi60rObeCyTe8aMCVnZT3+812/gIwmjiAFj1RZYocZnhI/65jHLXSO+5B9pFB5IOnjK2sObQwzvHxNQ+vkoFwIycwmuoF4kP1ZXSVx5r/ycNA1LgSE9SuL58KgF++i3liwfDSjJC4CsIwzO6V8mXy+CnHcAGvtxvh5JnrZqAXl23oiPWM= Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-MS-Exchange-CrossTenant-Network-Message-Id: 52f8d983-9aba-4079-e95d-08d7044c8a1d X-MS-Exchange-CrossTenant-originalarrivaltime: 09 Jul 2019 09:05:07.5837 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 70e1fb47-1155-421d-87fc-2e58f638b6e0 X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: jerinj@marvell.com X-MS-Exchange-Transport-CrossTenantHeadersStamped: BYAPR18MB3031 X-OriginatorOrg: marvell.com X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:, , definitions=2019-07-09_04:, , signatures=0 Subject: Re: [dpdk-dev] [EXT] Re: [PATCH] bus/pci: fix IOVA as VA mode selection X-BeenThere: dev@dpdk.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: DPDK patches and discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dev-bounces@dpdk.org Sender: "dev" > -----Original Message----- > From: Bruce Richardson > Sent: Tuesday, July 9, 2019 2:10 PM > To: Jerin Jacob Kollanukkaran > Cc: David Marchand ; dev ; > Thomas Monjalon ; Ben Walker > ; Burakov, Anatoly > > Subject: Re: [dpdk-dev] [EXT] Re: [PATCH] bus/pci: fix IOVA as VA mode > selection >=20 > On Mon, Jul 08, 2019 at 07:13:28PM +0000, Jerin Jacob Kollanukkaran wrote= : > > See below, > > > > Please send the email as text to avoid formatting issue.(No HTML) > > > > From: David Marchand > > Sent: Tuesday, July 9, 2019 12:09 AM > > To: Jerin Jacob Kollanukkaran > > Cc: dev ; Thomas Monjalon ; > Ben > > Walker ; Burakov, Anatoly > > > > Subject: [EXT] Re: [dpdk-dev] [PATCH] bus/pci: fix IOVA as VA mode > > selection > > > > ________________________________________ > > > > On Mon, Jul 8, 2019 at 4:25 PM wrote: > > From: Jerin Jacob > > > > Existing logic fails to select IOVA mode as VA if driver request to > > enable IOVA as VA. > > > > IOVA as VA has more strict requirement than other modes, so enabling > > positive logic for IOVA as VA selection. > > > > This patch also updates the default IOVA mode as PA for PCI devices as > > it has to deal with DMA engines unlike the virtual devices that may > > need only IOVA as DC. > > > > We have three cases: > > - driver/hw supports IOVA as PA only > > > > [Jerin] It is not driver cap, it is more of system cap(IOMMU vs non > > IOMMU). We are already addressing that case > > >=20 > Not necessarily. It's possible to have hardware that does not use the IOM= MU > on a platform. Therefore, you have more than two options to support. Any example such device? >=20 > /Bruce