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charset="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-AuthSource: BN9PR11MB5276.namprd11.prod.outlook.com X-MS-Exchange-CrossTenant-Network-Message-Id: 193fd247-35c2-4dbc-255f-08da6af6a52d X-MS-Exchange-CrossTenant-originalarrivaltime: 21 Jul 2022 08:54:39.1575 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 46c98d88-e344-4ed4-8496-4ed7712e255d X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: 6WhF3nWbBJdmsYebnFEbvrXKbHeP9UcmkA/xukQAnIndIXg06B8+J4N5UO7/Om+qRWQdCIv9DEvOLN+xVdc+Hw== X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM8PR11MB5591 X-OriginatorOrg: intel.com Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org > From: Jason Gunthorpe > Sent: Wednesday, July 20, 2022 4:08 AM >=20 > On Tue, Jul 19, 2022 at 01:25:14PM -0600, Alex Williamson wrote: >=20 > > > We don't really expect user space to hit this limit, the RAM in QEMU = is > > > divided today to around ~12 ranges as we saw so far in our evaluation= . > > > > There can be far more for vIOMMU use cases or non-QEMU drivers. >=20 > Not really, it isn't dynamic so vIOMMU has to decide what it wants to > track up front. It would never make sense to track based on what is > currently mapped. So it will be some small list, probably a big linear > chunk of the IOVA space. How would vIOMMU make such decision when the address space=20 is managed by the guest? it is dynamic and could be sparse. I'm curious about any example a vIOMMU can use to generate such small list. Would it be a single range based on aperture reported from the kernel?