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Wed, 23 Jun 2021 08:00:49 +0000 From: "Tian, Kevin" To: David Gibson CC: Jean-Philippe Brucker , "Alex Williamson (alex.williamson@redhat.com)" , "Raj, Ashok" , "kvm@vger.kernel.org" , "Jonathan Corbet" , Robin Murphy , LKML , Kirti Wankhede , "iommu@lists.linux-foundation.org" , "Jason Gunthorpe" , "Jiang, Dave" , "David Woodhouse" , Jason Wang Subject: RE: [RFC] /dev/ioasid uAPI proposal Thread-Topic: [RFC] /dev/ioasid uAPI proposal Thread-Index: AddSzQ97BhCb3gd8AUyldaDZ6yOMNAEqZK+AADR4pXACuXPOAAE11w8g Date: Wed, 23 Jun 2021 08:00:49 +0000 Message-ID: References: In-Reply-To: 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: gibson.dropbear.id.au; dkim=none (message not signed) header.d=none;gibson.dropbear.id.au; dmarc=none action=none header.from=intel.com; x-originating-ip: [192.198.143.21] x-ms-publictraffictype: Email x-ms-office365-filtering-correlation-id: 78aa1a14-4516-4f41-fcb1-08d9361d0392 x-ms-traffictypediagnostic: MWHPR11MB1933: x-ld-processed: 46c98d88-e344-4ed4-8496-4ed7712e255d,ExtAddr x-ms-exchange-transport-forked: True x-microsoft-antispam-prvs: x-ms-oob-tlc-oobclassifiers: OLM:4303; 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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: MWHPR11MB1886.namprd11.prod.outlook.com X-MS-Exchange-CrossTenant-Network-Message-Id: 78aa1a14-4516-4f41-fcb1-08d9361d0392 X-MS-Exchange-CrossTenant-originalarrivaltime: 23 Jun 2021 08:00:49.0352 (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: KkAXK3VlLxAVMp4JSNV1X39BurHGiJjJbRiCwTfW5vU+AD3lhb4Fs1k0MB1Qjter8herewH5G0pMesWpiWi+0g== X-MS-Exchange-Transport-CrossTenantHeadersStamped: MWHPR11MB1933 X-OriginatorOrg: intel.com Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org > From: David Gibson > Sent: Thursday, June 17, 2021 12:08 PM >=20 > On Thu, Jun 03, 2021 at 08:12:27AM +0000, Tian, Kevin wrote: > > > From: David Gibson > > > Sent: Wednesday, June 2, 2021 2:15 PM > > > > > [...] > > > > > > > > > > /* > > > > * Get information about an I/O address space > > > > * > > > > * Supported capabilities: > > > > * - VFIO type1 map/unmap; > > > > * - pgtable/pasid_table binding > > > > * - hardware nesting vs. software nesting; > > > > * - ... > > > > * > > > > * Related attributes: > > > > * - supported page sizes, reserved IOVA ranges (DMA > mapping); > > > > > > Can I request we represent this in terms of permitted IOVA ranges, > > > rather than reserved IOVA ranges. This works better with the "window= " > > > model I have in mind for unifying the restrictions of the POWER IOMMU > > > with Type1 like mapping. > > > > Can you elaborate how permitted range work better here? >=20 > Pretty much just that MAP operations would fail if they don't entirely > lie within a permitted range. So, for example if your IOMMU only > implements say, 45 bits of IOVA, then you'd have 0..0x1fffffffffff as > your only permitted range. If, like the POWER paravirtual IOMMU (in > defaut configuration) you have a small (1G) 32-bit range and a large > (45-bit) 64-bit range at a high address, you'd have say: > 0x00000000..0x3fffffff (32-bit range) > and > 0x800000000000000 .. 0x8001fffffffffff (64-bit range) > as your permitted ranges. >=20 > If your IOMMU supports truly full 64-bit addressing, but has a > reserved range (for MSIs or whatever) at 0xaaaa000..0xbbbb0000 then > you'd have permitted ranges of 0..0xaaa9ffff and > 0xbbbb0000..0xffffffffffffffff. I see. Has incorporated this comment in v2. >=20 > [snip] > > > For debugging and certain hypervisor edge cases it might be useful to > > > have a call to allow userspace to lookup and specific IOVA in a guest > > > managed pgtable. > > > > Since all the mapping metadata is from userspace, why would one > > rely on the kernel to provide such service? Or are you simply asking > > for some debugfs node to dump the I/O page table for a given > > IOASID? >=20 > I'm thinking of this as a debugging aid so you can make sure that how > the kernel is interpreting that metadata in the same way that your > userspace expects it to interpret that metadata. >=20 I'll not include it in this RFC. There are already too many stuff. The debugging aid can be added anyway when it's actually required.=20 Thanks, Kevin From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-3.5 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 20B37C49EA4 for ; Wed, 23 Jun 2021 08:01:12 +0000 (UTC) Received: from smtp4.osuosl.org (smtp4.osuosl.org [140.211.166.137]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id C7E4B6128C for ; Wed, 23 Jun 2021 08:01:11 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org C7E4B6128C Authentication-Results: mail.kernel.org; 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charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: iommu-bounces@lists.linux-foundation.org Sender: "iommu" > From: David Gibson > Sent: Thursday, June 17, 2021 12:08 PM > > On Thu, Jun 03, 2021 at 08:12:27AM +0000, Tian, Kevin wrote: > > > From: David Gibson > > > Sent: Wednesday, June 2, 2021 2:15 PM > > > > > [...] > > > > > > > > > > /* > > > > * Get information about an I/O address space > > > > * > > > > * Supported capabilities: > > > > * - VFIO type1 map/unmap; > > > > * - pgtable/pasid_table binding > > > > * - hardware nesting vs. software nesting; > > > > * - ... > > > > * > > > > * Related attributes: > > > > * - supported page sizes, reserved IOVA ranges (DMA > mapping); > > > > > > Can I request we represent this in terms of permitted IOVA ranges, > > > rather than reserved IOVA ranges. This works better with the "window" > > > model I have in mind for unifying the restrictions of the POWER IOMMU > > > with Type1 like mapping. > > > > Can you elaborate how permitted range work better here? > > Pretty much just that MAP operations would fail if they don't entirely > lie within a permitted range. So, for example if your IOMMU only > implements say, 45 bits of IOVA, then you'd have 0..0x1fffffffffff as > your only permitted range. If, like the POWER paravirtual IOMMU (in > defaut configuration) you have a small (1G) 32-bit range and a large > (45-bit) 64-bit range at a high address, you'd have say: > 0x00000000..0x3fffffff (32-bit range) > and > 0x800000000000000 .. 0x8001fffffffffff (64-bit range) > as your permitted ranges. > > If your IOMMU supports truly full 64-bit addressing, but has a > reserved range (for MSIs or whatever) at 0xaaaa000..0xbbbb0000 then > you'd have permitted ranges of 0..0xaaa9ffff and > 0xbbbb0000..0xffffffffffffffff. I see. Has incorporated this comment in v2. > > [snip] > > > For debugging and certain hypervisor edge cases it might be useful to > > > have a call to allow userspace to lookup and specific IOVA in a guest > > > managed pgtable. > > > > Since all the mapping metadata is from userspace, why would one > > rely on the kernel to provide such service? Or are you simply asking > > for some debugfs node to dump the I/O page table for a given > > IOASID? > > I'm thinking of this as a debugging aid so you can make sure that how > the kernel is interpreting that metadata in the same way that your > userspace expects it to interpret that metadata. > I'll not include it in this RFC. There are already too many stuff. The debugging aid can be added anyway when it's actually required. Thanks, Kevin _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu