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Sat, 8 May 2021 05:46:09 +0000 From: "Tian, Kevin" To: Jason Gunthorpe CC: Alex Williamson , "Liu, Yi L" , Jacob Pan , Auger Eric , Jean-Philippe Brucker , LKML , Joerg Roedel , Lu Baolu , David Woodhouse , "iommu@lists.linux-foundation.org" , "cgroups@vger.kernel.org" , Tejun Heo , Li Zefan , Johannes Weiner , Jean-Philippe Brucker , Jonathan Corbet , "Raj, Ashok" , "Wu, Hao" , "Jiang, Dave" Subject: RE: [PATCH V4 05/18] iommu/ioasid: Redefine IOASID set and allocation APIs Thread-Topic: [PATCH V4 05/18] iommu/ioasid: Redefine IOASID set and allocation APIs Thread-Index: AQHXDZub0CDG82VGXUmLEYgvMuPs4KqKkLIAgACg94CAAC72gIAAD04AgAADogCAAErUgIAETQEAgAOaswCAB7C3gIAAhxQwgADYDACAATCSAIAAVGMAgAELsQCAACiXgIAAVBgAgAAaMwCAAAESAIAABy2AgAAgOYCAFdCAgIAAppUAgADsNgCAACqygIAHsmaAgAAzsYCAAAjdgIAAD/yAgAAcQgCAADqggIAAk6nQgABIUACAASsnkIAAYWwAgALs9qCAAdeZgIACip7wgAEiVwCADrrawA== Date: Sat, 8 May 2021 05:46:09 +0000 Message-ID: References: <20210421175203.GN1370958@nvidia.com> <20210421133312.15307c44@redhat.com> <20210421230301.GP1370958@nvidia.com> <20210422121020.GT1370958@nvidia.com> <20210423114944.GF1370958@nvidia.com> <20210426123817.GQ1370958@nvidia.com> <20210428204606.GX1370958@nvidia.com> In-Reply-To: <20210428204606.GX1370958@nvidia.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: dlp-version: 11.5.1.3 dlp-product: dlpe-windows dlp-reaction: no-action authentication-results: nvidia.com; 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Sat, 8 May 2021 05:46:09 +0000 From: "Tian, Kevin" To: Jason Gunthorpe Subject: RE: [PATCH V4 05/18] iommu/ioasid: Redefine IOASID set and allocation APIs Thread-Topic: [PATCH V4 05/18] iommu/ioasid: Redefine IOASID set and allocation APIs Thread-Index: AQHXDZub0CDG82VGXUmLEYgvMuPs4KqKkLIAgACg94CAAC72gIAAD04AgAADogCAAErUgIAETQEAgAOaswCAB7C3gIAAhxQwgADYDACAATCSAIAAVGMAgAELsQCAACiXgIAAVBgAgAAaMwCAAAESAIAABy2AgAAgOYCAFdCAgIAAppUAgADsNgCAACqygIAHsmaAgAAzsYCAAAjdgIAAD/yAgAAcQgCAADqggIAAk6nQgABIUACAASsnkIAAYWwAgALs9qCAAdeZgIACip7wgAEiVwCADrrawA== Date: Sat, 8 May 2021 05:46:09 +0000 Message-ID: References: <20210421175203.GN1370958@nvidia.com> <20210421133312.15307c44@redhat.com> <20210421230301.GP1370958@nvidia.com> <20210422121020.GT1370958@nvidia.com> <20210423114944.GF1370958@nvidia.com> <20210426123817.GQ1370958@nvidia.com> <20210428204606.GX1370958@nvidia.com> In-Reply-To: <20210428204606.GX1370958@nvidia.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: dlp-version: 11.5.1.3 dlp-product: dlpe-windows dlp-reaction: no-action authentication-results: nvidia.com; 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charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: iommu-bounces@lists.linux-foundation.org Sender: "iommu" > From: Jason Gunthorpe > Sent: Thursday, April 29, 2021 4:46 AM > > > > I think the name IOASID is fine for the uAPI, the kernel version can > > > be called ioasid_id or something. > > > > ioasid is already an id and then ioasid_id just adds confusion. Another > > point is that ioasid is currently used to represent both PCI PASID and > > ARM substream ID in the kernel. It implies that if we want to separate > > ioasid and pasid in the uAPI the 'pasid' also needs to be replaced with > > another general term usable for substream ID. Are we making the > > terms too confusing here? > > This is why I also am not so sure about exposing the PASID in the API > because it is ultimately a HW specific item. > > As I said to David, one avenue is to have some generic uAPI that is > very general and keep all this deeply detailed stuff, that really only > matters for qemu, as part of a more HW specific vIOMMU driver > interface. > OK, so the general uAPI will not expose hw_id and just provide everything generic for managing I/O page table (map/unmap, nesting, etc.) through IOASID and then specific uAPI is provided to handle platform specific requirements (hw_id, iova windows, etc.) Thanks Kevin _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Tian, Kevin" Subject: RE: [PATCH V4 05/18] iommu/ioasid: Redefine IOASID set and allocation APIs Date: Sat, 8 May 2021 05:46:09 +0000 Message-ID: References: <20210421175203.GN1370958@nvidia.com> <20210421133312.15307c44@redhat.com> <20210421230301.GP1370958@nvidia.com> <20210422121020.GT1370958@nvidia.com> <20210423114944.GF1370958@nvidia.com> <20210426123817.GQ1370958@nvidia.com> <20210428204606.GX1370958@nvidia.com> Mime-Version: 1.0 Content-Transfer-Encoding: base64 Return-path: DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=intel.onmicrosoft.com; s=selector2-intel-onmicrosoft-com; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=QifxiqKM68aD+Y4zhQAHqfPHngOrU7xs8nSqzNmvdjk=; b=zMlZqR5yg1Z2aN2Va6OSrmGUVJggjdgzdD8HCMMSwO7CFO0XHtqq109N5y2rgOc0/XIzvnbe4Mr+PRqCxVXwab6AHnuIdIhjbEMNAaUshDkKjBEaL3J1U+ZZU5tpOyRQk6pL8uqVbxVURgGRbdalQbQWCNqOBRUSyyM5DCEniwU= In-Reply-To: <20210428204606.GX1370958-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org> Content-Language: en-US List-ID: Content-Type: text/plain; charset="us-ascii" To: Jason Gunthorpe Cc: Alex Williamson , "Liu, Yi L" , Jacob Pan , Auger Eric , Jean-Philippe Brucker , LKML , Joerg Roedel , Lu Baolu , David Woodhouse , "iommu-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org" , "cgroups-u79uwXL29TY76Z2rM5mHXA@public.gmane.org" , Tejun Heo , Li Zefan , Johannes Weiner , Jean-Philippe Brucker , Jonathan Corbet , "Raj, Ashok" , "Wu, Hao" , "Jiang, Dave" PiBGcm9tOiBKYXNvbiBHdW50aG9ycGUgPGpnZ0BudmlkaWEuY29tPg0KPiBTZW50OiBUaHVyc2Rh eSwgQXByaWwgMjksIDIwMjEgNDo0NiBBTQ0KPiANCj4gPiA+IEkgdGhpbmsgdGhlIG5hbWUgSU9B U0lEIGlzIGZpbmUgZm9yIHRoZSB1QVBJLCB0aGUga2VybmVsIHZlcnNpb24gY2FuDQo+ID4gPiBi ZSBjYWxsZWQgaW9hc2lkX2lkIG9yIHNvbWV0aGluZy4NCj4gPg0KPiA+IGlvYXNpZCBpcyBhbHJl YWR5IGFuIGlkIGFuZCB0aGVuIGlvYXNpZF9pZCBqdXN0IGFkZHMgY29uZnVzaW9uLiBBbm90aGVy DQo+ID4gcG9pbnQgaXMgdGhhdCBpb2FzaWQgaXMgY3VycmVudGx5IHVzZWQgdG8gcmVwcmVzZW50 IGJvdGggUENJIFBBU0lEIGFuZA0KPiA+IEFSTSBzdWJzdHJlYW0gSUQgaW4gdGhlIGtlcm5lbC4g SXQgaW1wbGllcyB0aGF0IGlmIHdlIHdhbnQgdG8gc2VwYXJhdGUNCj4gPiBpb2FzaWQgYW5kIHBh c2lkIGluIHRoZSB1QVBJIHRoZSAncGFzaWQnIGFsc28gbmVlZHMgdG8gYmUgcmVwbGFjZWQgd2l0 aA0KPiA+IGFub3RoZXIgZ2VuZXJhbCB0ZXJtIHVzYWJsZSBmb3Igc3Vic3RyZWFtIElELiBBcmUg d2UgbWFraW5nIHRoZQ0KPiA+IHRlcm1zIHRvbyBjb25mdXNpbmcgaGVyZT8NCj4gDQo+IFRoaXMg aXMgd2h5IEkgYWxzbyBhbSBub3Qgc28gc3VyZSBhYm91dCBleHBvc2luZyB0aGUgUEFTSUQgaW4g dGhlIEFQSQ0KPiBiZWNhdXNlIGl0IGlzIHVsdGltYXRlbHkgYSBIVyBzcGVjaWZpYyBpdGVtLg0K PiANCj4gQXMgSSBzYWlkIHRvIERhdmlkLCBvbmUgYXZlbnVlIGlzIHRvIGhhdmUgc29tZSBnZW5l cmljIHVBUEkgdGhhdCBpcw0KPiB2ZXJ5IGdlbmVyYWwgYW5kIGtlZXAgYWxsIHRoaXMgZGVlcGx5 IGRldGFpbGVkIHN0dWZmLCB0aGF0IHJlYWxseSBvbmx5DQo+IG1hdHRlcnMgZm9yIHFlbXUsIGFz IHBhcnQgb2YgYSBtb3JlIEhXIHNwZWNpZmljIHZJT01NVSBkcml2ZXINCj4gaW50ZXJmYWNlLg0K PiANCg0KT0ssIHNvIHRoZSBnZW5lcmFsIHVBUEkgd2lsbCBub3QgZXhwb3NlIGh3X2lkIGFuZCBq dXN0IHByb3ZpZGUgZXZlcnl0aGluZw0KZ2VuZXJpYyBmb3IgbWFuYWdpbmcgSS9PIHBhZ2UgdGFi bGUgKG1hcC91bm1hcCwgbmVzdGluZywgZXRjLikgdGhyb3VnaCANCklPQVNJRCBhbmQgdGhlbiBz cGVjaWZpYyB1QVBJIGlzIHByb3ZpZGVkIHRvIGhhbmRsZSBwbGF0Zm9ybSBzcGVjaWZpYw0KcmVx dWlyZW1lbnRzIChod19pZCwgaW92YSB3aW5kb3dzLCBldGMuKQ0KDQpUaGFua3MNCktldmluDQo=