From: Jason Gunthorpe <jgg@nvidia.com> To: "Tian, Kevin" <kevin.tian@intel.com> Cc: LKML <linux-kernel@vger.kernel.org>, Joerg Roedel <joro@8bytes.org>, Lu Baolu <baolu.lu@linux.intel.com>, David Woodhouse <dwmw2@infradead.org>, "iommu@lists.linux-foundation.org" <iommu@lists.linux-foundation.org>, "kvm@vger.kernel.org" <kvm@vger.kernel.org>, "Alex Williamson (alex.williamson@redhat.com)" <alex.williamson@redhat.com>, Jason Wang <jasowang@redhat.com>, Eric Auger <eric.auger@redhat.com>, Jonathan Corbet <corbet@lwn.net>, "Raj, Ashok" <ashok.raj@intel.com>, "Liu, Yi L" <yi.l.liu@intel.com>, "Wu, Hao" <hao.wu@intel.com>, "Jiang, Dave" <dave.jiang@intel.com>, Jacob Pan <jacob.jun.pan@linux.intel.com>, Jean-Philippe Brucker <jean-philippe@linaro.org>, David Gibson <david@gibson.dropbear.id.au>, Kirti Wankhede <kwankhede@nvidia.com>, Robin Murphy <robin.murphy@arm.com> Subject: Re: [RFC] /dev/ioasid uAPI proposal Date: Thu, 3 Jun 2021 10:05:19 -0300 [thread overview] Message-ID: <20210603130519.GY1002214@nvidia.com> (raw) In-Reply-To: <MWHPR11MB188621A9D1181A414D5491198C3C9@MWHPR11MB1886.namprd11.prod.outlook.com> On Thu, Jun 03, 2021 at 06:39:30AM +0000, Tian, Kevin wrote: > > > Two helper functions are provided to support VFIO_ATTACH_IOASID: > > > > > > struct attach_info { > > > u32 ioasid; > > > // If valid, the PASID to be used physically > > > u32 pasid; > > > }; > > > int ioasid_device_attach(struct ioasid_dev *dev, > > > struct attach_info info); > > > int ioasid_device_detach(struct ioasid_dev *dev, u32 ioasid); > > > > Honestly, I still prefer this to be highly explicit as this is where > > all device driver authors get invovled: > > > > ioasid_pci_device_attach(struct pci_device *pdev, struct ioasid_dev *dev, > > u32 ioasid); > > ioasid_pci_device_pasid_attach(struct pci_device *pdev, u32 *physical_pasid, > > struct ioasid_dev *dev, u32 ioasid); > > Then better naming it as pci_device_attach_ioasid since the 1st parameter > is struct pci_device? No, the leading tag indicates the API's primary subystem, in this case it is iommu (and if you prefer list the iommu related arguments first) > By keeping physical_pasid as a pointer, you want to remove the last helper > function (ioasid_get_global_pasid) so the global pasid is returned along > with the attach function? It is just a thought.. It allows the caller to both specify a fixed PASID and request an allocation I still dont have a clear idea how all this PASID complexity should work, sorry. > > > The actual policy depends on pdev vs. mdev, and whether ENQCMD is > > > supported. There are three possible scenarios: > > > > > > (Note: /dev/ioasid uAPI is not affected by underlying PASID virtualization > > > policies.) > > > > This has become unclear. I think this should start by identifying the > > 6 main type of devices and how they can use pPASID/vPASID: > > > > 0) Device is a RID and cannot issue PASID > > 1) Device is a mdev and cannot issue PASID > > 2) Device is a mdev and programs a single fixed PASID during bind, > > does not accept PASID from the guest > > There are no vPASID per se in above 3 types. So this section only > focus on the latter 3 types. But I can include them in next version > if it sets the tone clearer. I think it helps > > > > 3) Device accepts any PASIDs from the guest. No > > vPASID/pPASID translation is possible. (classic vfio_pci) > > 4) Device accepts any PASID from the guest and has an > > internal vPASID/pPASID translation (enhanced vfio_pci) > > what is enhanced vfio_pci? In my writing this is for mdev > which doesn't support ENQCMD This is a vfio_pci that mediates some element of the device interface to communicate the vPASID/pPASID table to the device, using Max's series for vfio_pci drivers to inject itself into VFIO. For instance a device might send a message through the PF that the VF has a certain vPASID/pPASID translation table. This would be useful for devices that cannot use ENQCMD but still want to support migration and thus need vPASID. > for 0-2 the device will report no PASID support. Although this may duplicate > with other information (e.g. PCI PASID cap), this provides a vendor-agnostic > way for reporting details around IOASID. We have to consider mdevs too here, so PCI caps are not general enough > for 3-5 the device will report PASID support. In these cases the user is > expected to always provide a vPASID. > > for 5 in addition the device will report a requirement on CPU PASID > translation. For such device the user should talk to KVM to setup the PASID > mapping. This way the user doesn't need to know whether a device is > pdev or mdev. Just follows what device capability reports. Something like that. Needs careful documentation Jason
WARNING: multiple messages have this Message-ID (diff)
From: Jason Gunthorpe <jgg@nvidia.com> To: "Tian, Kevin" <kevin.tian@intel.com> Cc: Jean-Philippe Brucker <jean-philippe@linaro.org>, "Alex Williamson \(alex.williamson@redhat.com\)" <alex.williamson@redhat.com>, "Raj, Ashok" <ashok.raj@intel.com>, "kvm@vger.kernel.org" <kvm@vger.kernel.org>, Jonathan Corbet <corbet@lwn.net>, Robin Murphy <robin.murphy@arm.com>, LKML <linux-kernel@vger.kernel.org>, Kirti Wankhede <kwankhede@nvidia.com>, "iommu@lists.linux-foundation.org" <iommu@lists.linux-foundation.org>, David Gibson <david@gibson.dropbear.id.au>, "Jiang, Dave" <dave.jiang@intel.com>, David Woodhouse <dwmw2@infradead.org>, Jason Wang <jasowang@redhat.com> Subject: Re: [RFC] /dev/ioasid uAPI proposal Date: Thu, 3 Jun 2021 10:05:19 -0300 [thread overview] Message-ID: <20210603130519.GY1002214@nvidia.com> (raw) In-Reply-To: <MWHPR11MB188621A9D1181A414D5491198C3C9@MWHPR11MB1886.namprd11.prod.outlook.com> On Thu, Jun 03, 2021 at 06:39:30AM +0000, Tian, Kevin wrote: > > > Two helper functions are provided to support VFIO_ATTACH_IOASID: > > > > > > struct attach_info { > > > u32 ioasid; > > > // If valid, the PASID to be used physically > > > u32 pasid; > > > }; > > > int ioasid_device_attach(struct ioasid_dev *dev, > > > struct attach_info info); > > > int ioasid_device_detach(struct ioasid_dev *dev, u32 ioasid); > > > > Honestly, I still prefer this to be highly explicit as this is where > > all device driver authors get invovled: > > > > ioasid_pci_device_attach(struct pci_device *pdev, struct ioasid_dev *dev, > > u32 ioasid); > > ioasid_pci_device_pasid_attach(struct pci_device *pdev, u32 *physical_pasid, > > struct ioasid_dev *dev, u32 ioasid); > > Then better naming it as pci_device_attach_ioasid since the 1st parameter > is struct pci_device? No, the leading tag indicates the API's primary subystem, in this case it is iommu (and if you prefer list the iommu related arguments first) > By keeping physical_pasid as a pointer, you want to remove the last helper > function (ioasid_get_global_pasid) so the global pasid is returned along > with the attach function? It is just a thought.. It allows the caller to both specify a fixed PASID and request an allocation I still dont have a clear idea how all this PASID complexity should work, sorry. > > > The actual policy depends on pdev vs. mdev, and whether ENQCMD is > > > supported. There are three possible scenarios: > > > > > > (Note: /dev/ioasid uAPI is not affected by underlying PASID virtualization > > > policies.) > > > > This has become unclear. I think this should start by identifying the > > 6 main type of devices and how they can use pPASID/vPASID: > > > > 0) Device is a RID and cannot issue PASID > > 1) Device is a mdev and cannot issue PASID > > 2) Device is a mdev and programs a single fixed PASID during bind, > > does not accept PASID from the guest > > There are no vPASID per se in above 3 types. So this section only > focus on the latter 3 types. But I can include them in next version > if it sets the tone clearer. I think it helps > > > > 3) Device accepts any PASIDs from the guest. No > > vPASID/pPASID translation is possible. (classic vfio_pci) > > 4) Device accepts any PASID from the guest and has an > > internal vPASID/pPASID translation (enhanced vfio_pci) > > what is enhanced vfio_pci? In my writing this is for mdev > which doesn't support ENQCMD This is a vfio_pci that mediates some element of the device interface to communicate the vPASID/pPASID table to the device, using Max's series for vfio_pci drivers to inject itself into VFIO. For instance a device might send a message through the PF that the VF has a certain vPASID/pPASID translation table. This would be useful for devices that cannot use ENQCMD but still want to support migration and thus need vPASID. > for 0-2 the device will report no PASID support. Although this may duplicate > with other information (e.g. PCI PASID cap), this provides a vendor-agnostic > way for reporting details around IOASID. We have to consider mdevs too here, so PCI caps are not general enough > for 3-5 the device will report PASID support. In these cases the user is > expected to always provide a vPASID. > > for 5 in addition the device will report a requirement on CPU PASID > translation. For such device the user should talk to KVM to setup the PASID > mapping. This way the user doesn't need to know whether a device is > pdev or mdev. Just follows what device capability reports. Something like that. Needs careful documentation Jason _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu
next prev parent reply other threads:[~2021-06-03 13:05 UTC|newest] Thread overview: 518+ messages / expand[flat|nested] mbox.gz Atom feed top 2021-05-27 7:58 [RFC] /dev/ioasid uAPI proposal Tian, Kevin 2021-05-27 7:58 ` Tian, Kevin 2021-05-28 2:24 ` Jason Wang 2021-05-28 2:24 ` Jason Wang 2021-05-28 20:25 ` Jason Gunthorpe 2021-05-28 20:25 ` Jason Gunthorpe 2021-05-31 8:41 ` Liu Yi L 2021-06-01 2:36 ` Jason Wang 2021-06-01 2:36 ` Jason Wang 2021-06-01 3:31 ` Liu Yi L 2021-06-01 5:08 ` Jason Wang 2021-06-01 5:08 ` Jason Wang 2021-06-01 5:23 ` Lu Baolu 2021-06-01 5:23 ` Lu Baolu 2021-06-01 5:29 ` Jason Wang 2021-06-01 5:29 ` Jason Wang 2021-06-01 5:42 ` Tian, Kevin 2021-06-01 5:42 ` Tian, Kevin 2021-06-01 6:07 ` Jason Wang 2021-06-01 6:07 ` Jason Wang 2021-06-01 6:16 ` Tian, Kevin 2021-06-01 6:16 ` Tian, Kevin 2021-06-01 8:47 ` Jason Wang 2021-06-01 8:47 ` Jason Wang 2021-06-01 17:31 ` Jason Gunthorpe 2021-06-01 17:31 ` Jason Gunthorpe 2021-06-02 8:54 ` Jason Wang 2021-06-02 8:54 ` Jason Wang 2021-06-02 17:21 ` Jason Gunthorpe 2021-06-02 17:21 ` Jason Gunthorpe 2021-06-07 13:30 ` Enrico Weigelt, metux IT consult 2021-06-07 13:30 ` Enrico Weigelt, metux IT consult 2021-06-07 18:01 ` Jason Gunthorpe 2021-06-07 18:01 ` Jason Gunthorpe 2021-06-08 10:45 ` Enrico Weigelt, metux IT consult 2021-06-08 10:45 ` Enrico Weigelt, metux IT consult 2021-06-10 2:16 ` Jason Wang 2021-06-10 2:16 ` Jason Wang 2021-06-08 1:10 ` Jason Wang 2021-06-08 1:10 ` Jason Wang 2021-06-08 13:20 ` Jason Gunthorpe 2021-06-08 13:20 ` Jason Gunthorpe 2021-06-10 2:00 ` Jason Wang 2021-06-10 2:00 ` Jason Wang 2021-06-10 4:03 ` Jason Wang 2021-06-10 4:03 ` Jason Wang 2021-06-10 11:47 ` Jason Gunthorpe 2021-06-10 11:47 ` Jason Gunthorpe 2021-06-11 5:43 ` Jason Wang 2021-06-11 5:43 ` Jason Wang 2021-06-01 17:29 ` Jason Gunthorpe 2021-06-01 17:29 ` Jason Gunthorpe 2021-06-02 8:58 ` Jason Wang 2021-06-02 8:58 ` Jason Wang 2021-06-01 4:27 ` Shenming Lu 2021-06-01 4:27 ` Shenming Lu 2021-06-01 5:10 ` Jason Wang 2021-06-01 5:10 ` Jason Wang 2021-05-28 16:23 ` Jean-Philippe Brucker 2021-05-28 16:23 ` Jean-Philippe Brucker 2021-05-28 20:16 ` Jason Gunthorpe 2021-05-28 20:16 ` Jason Gunthorpe 2021-06-01 7:50 ` Tian, Kevin 2021-06-01 7:50 ` Tian, Kevin 2021-05-28 17:35 ` Jason Gunthorpe 2021-05-28 17:35 ` Jason Gunthorpe 2021-06-01 8:10 ` Tian, Kevin 2021-06-01 8:10 ` Tian, Kevin 2021-06-01 17:42 ` Jason Gunthorpe 2021-06-01 17:42 ` Jason Gunthorpe 2021-06-02 1:33 ` Tian, Kevin 2021-06-02 1:33 ` Tian, Kevin 2021-06-02 16:09 ` Jason Gunthorpe 2021-06-02 16:09 ` Jason Gunthorpe 2021-06-03 1:29 ` Tian, Kevin 2021-06-03 1:29 ` Tian, Kevin 2021-06-03 5:09 ` David Gibson 2021-06-03 5:09 ` David Gibson 2021-06-03 6:49 ` Tian, Kevin 2021-06-03 6:49 ` Tian, Kevin 2021-06-03 11:47 ` Jason Gunthorpe 2021-06-03 11:47 ` Jason Gunthorpe 2021-06-04 2:15 ` Tian, Kevin 2021-06-04 2:15 ` Tian, Kevin 2021-06-08 0:49 ` David Gibson 2021-06-08 0:49 ` David Gibson 2021-06-09 2:52 ` Tian, Kevin 2021-06-09 2:52 ` Tian, Kevin 2021-06-02 6:32 ` David Gibson 2021-06-02 6:32 ` David Gibson 2021-06-02 16:16 ` Jason Gunthorpe 2021-06-02 16:16 ` Jason Gunthorpe 2021-06-03 2:11 ` Tian, Kevin 2021-06-03 2:11 ` Tian, Kevin 2021-06-03 5:13 ` David Gibson 2021-06-03 5:13 ` David Gibson 2021-06-03 11:52 ` Jason Gunthorpe 2021-06-03 11:52 ` Jason Gunthorpe 2021-06-08 0:53 ` David Gibson 2021-06-08 0:53 ` David Gibson 2021-06-08 19:04 ` Jason Gunthorpe 2021-06-08 19:04 ` Jason Gunthorpe 2021-06-17 2:42 ` David Gibson 2021-06-17 2:42 ` David Gibson 2021-05-28 19:58 ` Jason Gunthorpe 2021-05-28 19:58 ` Jason Gunthorpe 2021-06-01 8:38 ` Tian, Kevin 2021-06-01 8:38 ` Tian, Kevin 2021-06-01 17:56 ` Jason Gunthorpe 2021-06-01 17:56 ` Jason Gunthorpe 2021-06-02 2:00 ` Tian, Kevin 2021-06-02 2:00 ` Tian, Kevin 2021-06-02 6:57 ` David Gibson 2021-06-02 6:57 ` David Gibson 2021-06-02 16:37 ` Jason Gunthorpe 2021-06-02 16:37 ` Jason Gunthorpe 2021-06-03 5:23 ` David Gibson 2021-06-03 5:23 ` David Gibson 2021-06-03 12:28 ` Jason Gunthorpe 2021-06-03 12:28 ` Jason Gunthorpe 2021-06-08 6:04 ` David Gibson 2021-06-08 6:04 ` David Gibson 2021-06-08 19:23 ` Jason Gunthorpe 2021-06-08 19:23 ` Jason Gunthorpe 2021-06-02 6:48 ` David Gibson 2021-06-02 6:48 ` David Gibson 2021-06-02 16:58 ` Jason Gunthorpe 2021-06-02 16:58 ` Jason Gunthorpe 2021-06-03 2:49 ` Tian, Kevin 2021-06-03 2:49 ` Tian, Kevin 2021-06-03 5:48 ` David Gibson 2021-06-03 5:48 ` David Gibson 2021-06-03 5:45 ` David Gibson 2021-06-03 5:45 ` David Gibson 2021-06-03 12:11 ` Jason Gunthorpe 2021-06-03 12:11 ` Jason Gunthorpe 2021-06-04 6:08 ` Tian, Kevin 2021-06-04 6:08 ` Tian, Kevin 2021-06-04 12:33 ` Jason Gunthorpe 2021-06-04 12:33 ` Jason Gunthorpe 2021-06-04 23:20 ` Tian, Kevin 2021-06-04 23:20 ` Tian, Kevin 2021-06-08 6:13 ` David Gibson 2021-06-08 6:13 ` David Gibson 2021-06-04 10:24 ` Jean-Philippe Brucker 2021-06-04 10:24 ` Jean-Philippe Brucker 2021-06-04 12:05 ` Jason Gunthorpe 2021-06-04 12:05 ` Jason Gunthorpe 2021-06-04 17:27 ` Jacob Pan 2021-06-04 17:27 ` Jacob Pan 2021-06-04 17:40 ` Jason Gunthorpe 2021-06-04 17:40 ` Jason Gunthorpe 2021-06-08 6:31 ` David Gibson 2021-06-08 6:31 ` David Gibson 2021-06-10 16:37 ` Jean-Philippe Brucker 2021-06-10 16:37 ` Jean-Philippe Brucker 2021-06-17 3:00 ` David Gibson 2021-06-17 3:00 ` David Gibson 2021-06-18 17:03 ` Jean-Philippe Brucker 2021-06-18 17:03 ` Jean-Philippe Brucker 2021-06-18 18:30 ` Jason Gunthorpe 2021-06-18 18:30 ` Jason Gunthorpe 2021-06-23 8:19 ` Tian, Kevin 2021-06-23 8:19 ` Tian, Kevin 2021-06-23 7:57 ` Tian, Kevin 2021-06-23 7:57 ` Tian, Kevin 2021-06-24 3:49 ` David Gibson 2021-06-24 3:49 ` David Gibson 2021-05-28 20:03 ` Jason Gunthorpe 2021-05-28 20:03 ` Jason Gunthorpe 2021-06-01 7:01 ` Tian, Kevin 2021-06-01 7:01 ` Tian, Kevin 2021-06-01 20:28 ` Jason Gunthorpe 2021-06-01 20:28 ` Jason Gunthorpe 2021-06-02 1:25 ` Tian, Kevin 2021-06-02 1:25 ` Tian, Kevin 2021-06-02 23:27 ` Jason Gunthorpe 2021-06-02 23:27 ` Jason Gunthorpe 2021-06-04 8:17 ` 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Gunthorpe 2021-06-03 2:50 ` Alex Williamson 2021-06-03 2:50 ` Alex Williamson 2021-06-03 3:22 ` Tian, Kevin 2021-06-03 3:22 ` Tian, Kevin 2021-06-03 4:14 ` Alex Williamson 2021-06-03 4:14 ` Alex Williamson 2021-06-03 5:18 ` Tian, Kevin 2021-06-03 5:18 ` Tian, Kevin 2021-06-03 12:40 ` Jason Gunthorpe 2021-06-03 12:40 ` Jason Gunthorpe 2021-06-03 20:41 ` Alex Williamson 2021-06-03 20:41 ` Alex Williamson 2021-06-04 9:19 ` Tian, Kevin 2021-06-04 9:19 ` Tian, Kevin 2021-06-04 15:37 ` Alex Williamson 2021-06-04 15:37 ` Alex Williamson 2021-06-04 12:13 ` Jason Gunthorpe 2021-06-04 12:13 ` Jason Gunthorpe 2021-06-04 21:45 ` Alex Williamson 2021-06-04 21:45 ` Alex Williamson 2021-06-04 7:33 ` Tian, Kevin 2021-06-04 7:33 ` Tian, Kevin 2021-06-03 12:34 ` Jason Gunthorpe 2021-06-03 12:34 ` Jason Gunthorpe 2021-06-03 20:01 ` Alex Williamson 2021-06-03 20:01 ` Alex Williamson 2021-06-03 20:10 ` Jason Gunthorpe 2021-06-03 20:10 ` Jason Gunthorpe 2021-06-03 21:44 ` Alex Williamson 2021-06-03 21:44 ` 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