From: Jason Gunthorpe <jgg@nvidia.com> To: "Jacob Pan (Jun)" <jacob.jun.pan@intel.com> Cc: "Raj, Ashok" <ashok.raj@intel.com>, Alex Williamson <alex.williamson@redhat.com>, Jean-Philippe Brucker <jean-philippe@linaro.org>, Jason Wang <jasowang@redhat.com>, Liu Yi L <yi.l.liu@intel.com>, <eric.auger@redhat.com>, <baolu.lu@linux.intel.com>, <joro@8bytes.org>, <kevin.tian@intel.com>, <jun.j.tian@intel.com>, <yi.y.sun@intel.com>, <peterx@redhat.com>, <hao.wu@intel.com>, <stefanha@gmail.com>, <iommu@lists.linux-foundation.org>, <kvm@vger.kernel.org>, "Michael S. Tsirkin" <mst@redhat.com>, <jacob.jun.pan@linux.intel.com> Subject: Re: [PATCH v7 00/16] vfio: expose virtual Shared Virtual Addressing to VMs Date: Wed, 16 Sep 2020 12:07:54 -0300 [thread overview] Message-ID: <20200916150754.GE6199@nvidia.com> (raw) In-Reply-To: <20200915171319.00003f59@linux.intel.com> On Tue, Sep 15, 2020 at 05:22:26PM -0700, Jacob Pan (Jun) wrote: > > If user space wants to bind page tables, create the PASID with > > /dev/sva, use ioctls there to setup the page table the way it wants, > > then pass the now configured PASID to a driver that can use it. > > Are we talking about bare metal SVA? What a weird term. > If so, I don't see the need for userspace to know there is a > PASID. All user space need is that my current mm is bound to a > device by the driver. So it can be a one-step process for user > instead of two. You've missed the entire point of the conversation, VDPA already needs more than "my current mm is bound to a device" > > PASID managment and binding is seperated from the driver(s) that are > > using the PASID. > > Why separate? Drivers need to be involved in PASID life cycle > management. For example, when tearing down a PASID, the driver needs to > stop DMA, IOMMU driver needs to unbind, etc. If driver is the control > point, then things are just in order. I am referring to bare metal SVA. Drivers can be involved and still have the uAPIs seperate. It isn't hard. Jason
WARNING: multiple messages have this Message-ID (diff)
From: Jason Gunthorpe <jgg@nvidia.com> To: "Jacob Pan (Jun)" <jacob.jun.pan@intel.com> Cc: yi.y.sun@intel.com, Jean-Philippe Brucker <jean-philippe@linaro.org>, kevin.tian@intel.com, "Raj, Ashok" <ashok.raj@intel.com>, kvm@vger.kernel.org, "Michael S. Tsirkin" <mst@redhat.com>, stefanha@gmail.com, Jason Wang <jasowang@redhat.com>, jun.j.tian@intel.com, Alex Williamson <alex.williamson@redhat.com>, iommu@lists.linux-foundation.org, hao.wu@intel.com Subject: Re: [PATCH v7 00/16] vfio: expose virtual Shared Virtual Addressing to VMs Date: Wed, 16 Sep 2020 12:07:54 -0300 [thread overview] Message-ID: <20200916150754.GE6199@nvidia.com> (raw) In-Reply-To: <20200915171319.00003f59@linux.intel.com> On Tue, Sep 15, 2020 at 05:22:26PM -0700, Jacob Pan (Jun) wrote: > > If user space wants to bind page tables, create the PASID with > > /dev/sva, use ioctls there to setup the page table the way it wants, > > then pass the now configured PASID to a driver that can use it. > > Are we talking about bare metal SVA? What a weird term. > If so, I don't see the need for userspace to know there is a > PASID. All user space need is that my current mm is bound to a > device by the driver. So it can be a one-step process for user > instead of two. You've missed the entire point of the conversation, VDPA already needs more than "my current mm is bound to a device" > > PASID managment and binding is seperated from the driver(s) that are > > using the PASID. > > Why separate? Drivers need to be involved in PASID life cycle > management. For example, when tearing down a PASID, the driver needs to > stop DMA, IOMMU driver needs to unbind, etc. If driver is the control > point, then things are just in order. I am referring to bare metal SVA. Drivers can be involved and still have the uAPIs seperate. It isn't hard. Jason _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu
next prev parent reply other threads:[~2020-09-16 20:23 UTC|newest] Thread overview: 165+ messages / expand[flat|nested] mbox.gz Atom feed top 2020-09-10 10:45 [PATCH v7 00/16] vfio: expose virtual Shared Virtual Addressing to VMs Liu Yi L 2020-09-10 10:45 ` Liu Yi L 2020-09-10 10:45 ` [PATCH v7 01/16] iommu: Report domain nesting info Liu Yi L 2020-09-10 10:45 ` Liu Yi L 2020-09-11 19:38 ` Alex Williamson 2020-09-11 19:38 ` Alex Williamson 2020-09-10 10:45 ` [PATCH v7 02/16] iommu/smmu: Report empty " Liu Yi L 2020-09-10 10:45 ` Liu Yi L 2021-01-12 6:50 ` Vivek Gautam 2021-01-12 6:50 ` Vivek Gautam 2021-01-12 9:21 ` Liu, Yi L 2021-01-12 9:21 ` Liu, Yi L 2021-01-12 11:05 ` Vivek Gautam 2021-01-12 11:05 ` Vivek Gautam 2021-01-13 5:56 ` Liu, Yi L 2021-01-13 5:56 ` Liu, Yi L 2021-01-19 10:03 ` Auger Eric 2021-01-19 10:03 ` Auger Eric 2021-01-23 8:59 ` Liu, Yi L 2021-01-23 8:59 ` Liu, Yi L 2021-02-12 7:14 ` Vivek Gautam 2021-02-12 7:14 ` Vivek Gautam 2021-02-12 9:57 ` Auger Eric 2021-02-12 9:57 ` Auger Eric 2021-02-12 10:18 ` Vivek Kumar Gautam 2021-02-12 10:18 ` Vivek Kumar Gautam 2021-02-12 11:01 ` Vivek Kumar Gautam 2021-02-12 11:01 ` Vivek Kumar Gautam 2021-03-03 9:44 ` Liu, Yi L 2021-03-03 9:44 ` Liu, Yi L 2020-09-10 10:45 ` [PATCH v7 03/16] vfio/type1: Report iommu nesting info to userspace Liu Yi L 2020-09-10 10:45 ` Liu Yi L 2020-09-11 20:16 ` Alex Williamson 2020-09-11 20:16 ` Alex Williamson 2020-09-12 8:24 ` Liu, Yi L 2020-09-12 8:24 ` Liu, Yi L 2020-09-10 10:45 ` [PATCH v7 04/16] vfio: Add PASID allocation/free support Liu Yi L 2020-09-10 10:45 ` Liu Yi L 2020-09-11 20:54 ` Alex Williamson 2020-09-11 20:54 ` Alex Williamson 2020-09-15 4:03 ` Liu, Yi L 2020-09-15 4:03 ` Liu, Yi L 2020-09-10 10:45 ` [PATCH v7 05/16] iommu/vt-d: Support setting ioasid set to domain Liu Yi L 2020-09-10 10:45 ` Liu Yi L 2020-09-10 10:45 ` [PATCH v7 06/16] iommu/vt-d: Remove get_task_mm() in bind_gpasid() Liu Yi L 2020-09-10 10:45 ` Liu Yi L 2020-09-10 10:45 ` [PATCH v7 07/16] vfio/type1: Add VFIO_IOMMU_PASID_REQUEST (alloc/free) Liu Yi L 2020-09-10 10:45 ` Liu Yi L 2020-09-11 21:38 ` Alex Williamson 2020-09-11 21:38 ` Alex Williamson 2020-09-12 6:17 ` Liu, Yi L 2020-09-10 10:45 ` [PATCH v7 08/16] iommu: Pass domain to sva_unbind_gpasid() Liu Yi L 2020-09-10 10:45 ` Liu Yi L 2020-09-10 10:45 ` [PATCH v7 09/16] iommu/vt-d: Check ownership for PASIDs from user-space Liu Yi L 2020-09-10 10:45 ` Liu Yi L 2020-09-10 10:45 ` [PATCH v7 10/16] vfio/type1: Support binding guest page tables to PASID Liu Yi L 2020-09-10 10:45 ` Liu Yi L 2020-09-11 22:03 ` Alex Williamson 2020-09-11 22:03 ` Alex Williamson 2020-09-12 6:02 ` Liu, Yi L 2020-09-12 6:02 ` Liu, Yi L 2020-09-10 10:45 ` [PATCH v7 11/16] vfio/type1: Allow invalidating first-level/stage IOMMU cache Liu Yi L 2020-09-10 10:45 ` Liu Yi L 2020-09-10 10:45 ` [PATCH v7 12/16] vfio/type1: Add vSVA support for IOMMU-backed mdevs Liu Yi L 2020-09-10 10:45 ` Liu Yi L 2020-09-10 10:45 ` [PATCH v7 13/16] vfio/pci: Expose PCIe PASID capability to guest Liu Yi L 2020-09-10 10:45 ` Liu Yi L 2020-09-11 22:13 ` Alex Williamson 2020-09-11 22:13 ` Alex Williamson 2020-09-12 7:17 ` Liu, Yi L 2020-09-12 7:17 ` Liu, Yi L 2020-09-10 10:45 ` [PATCH v7 14/16] vfio: Document dual stage control Liu Yi L 2020-09-10 10:45 ` Liu Yi L 2020-09-10 10:45 ` [PATCH v7 15/16] iommu/vt-d: Only support nesting when nesting caps are consistent across iommu units Liu Yi L 2020-09-10 10:45 ` Liu Yi L 2020-09-10 10:45 ` [PATCH v7 16/16] iommu/vt-d: Support reporting nesting capability info Liu Yi L 2020-09-10 10:45 ` Liu Yi L 2020-09-14 4:20 ` [PATCH v7 00/16] vfio: expose virtual Shared Virtual Addressing to VMs Jason Wang 2020-09-14 4:20 ` Jason Wang 2020-09-14 8:01 ` Tian, Kevin 2020-09-14 8:01 ` Tian, Kevin 2020-09-14 8:57 ` Jason Wang 2020-09-14 8:57 ` Jason Wang 2020-09-14 10:38 ` Tian, Kevin 2020-09-14 10:38 ` Tian, Kevin 2020-09-14 11:38 ` Jason Gunthorpe 2020-09-14 11:38 ` Jason Gunthorpe 2020-09-14 13:31 ` Jean-Philippe Brucker 2020-09-14 13:31 ` Jean-Philippe Brucker 2020-09-14 13:47 ` Jason Gunthorpe 2020-09-14 13:47 ` Jason Gunthorpe 2020-09-14 16:22 ` Raj, Ashok 2020-09-14 16:22 ` Raj, Ashok 2020-09-14 16:33 ` Jason Gunthorpe 2020-09-14 16:33 ` Jason Gunthorpe 2020-09-14 16:58 ` Alex Williamson 2020-09-14 16:58 ` Alex Williamson 2020-09-14 17:41 ` Jason Gunthorpe 2020-09-14 17:41 ` Jason Gunthorpe 2020-09-14 18:23 ` Alex Williamson 2020-09-14 18:23 ` Alex Williamson 2020-09-14 19:00 ` Jason Gunthorpe 2020-09-14 19:00 ` Jason Gunthorpe 2020-09-14 22:33 ` Alex Williamson 2020-09-14 22:33 ` Alex Williamson 2020-09-15 14:29 ` Jason Gunthorpe 2020-09-15 14:29 ` Jason Gunthorpe 2020-09-16 1:19 ` Tian, Kevin 2020-09-16 1:19 ` Tian, Kevin 2020-09-16 8:32 ` Jean-Philippe Brucker 2020-09-16 8:32 ` Jean-Philippe Brucker 2020-09-16 14:51 ` Jason Gunthorpe 2020-09-16 14:51 ` Jason Gunthorpe 2020-09-16 16:20 ` Jean-Philippe Brucker 2020-09-16 16:20 ` Jean-Philippe Brucker 2020-09-16 16:32 ` Jason Gunthorpe 2020-09-16 16:32 ` Jason Gunthorpe 2020-09-16 16:50 ` Auger Eric 2020-09-16 16:50 ` Auger Eric 2020-09-16 14:44 ` Jason Gunthorpe 2020-09-16 14:44 ` Jason Gunthorpe 2020-09-17 6:01 ` Tian, Kevin 2020-09-17 6:01 ` Tian, Kevin 2020-09-14 22:44 ` Raj, Ashok 2020-09-15 11:33 ` Jason Gunthorpe 2020-09-15 11:33 ` Jason Gunthorpe 2020-09-15 18:11 ` Raj, Ashok 2020-09-15 18:11 ` Raj, Ashok 2020-09-15 18:45 ` Jason Gunthorpe 2020-09-15 18:45 ` Jason Gunthorpe 2020-09-15 19:26 ` Raj, Ashok 2020-09-15 19:26 ` Raj, Ashok 2020-09-15 23:45 ` Jason Gunthorpe 2020-09-15 23:45 ` Jason Gunthorpe 2020-09-16 2:33 ` Jason Wang 2020-09-16 2:33 ` Jason Wang 2020-09-15 22:08 ` Jacob Pan 2020-09-15 22:08 ` Jacob Pan 2020-09-15 23:51 ` Jason Gunthorpe 2020-09-15 23:51 ` Jason Gunthorpe 2020-09-16 0:22 ` Jacob Pan (Jun) 2020-09-16 1:46 ` Lu Baolu 2020-09-16 1:46 ` Lu Baolu 2020-09-16 15:07 ` Jason Gunthorpe [this message] 2020-09-16 15:07 ` Jason Gunthorpe 2020-09-16 16:33 ` Raj, Ashok 2020-09-16 16:33 ` Raj, Ashok 2020-09-16 17:01 ` Jason Gunthorpe 2020-09-16 17:01 ` Jason Gunthorpe 2020-09-16 18:21 ` Jacob Pan (Jun) 2020-09-16 18:21 ` Jacob Pan (Jun) 2020-09-16 18:38 ` Jason Gunthorpe 2020-09-16 18:38 ` Jason Gunthorpe 2020-09-16 23:09 ` Jacob Pan (Jun) 2020-09-16 23:09 ` Jacob Pan (Jun) 2020-09-17 3:53 ` Jason Wang 2020-09-17 3:53 ` Jason Wang 2020-09-17 17:31 ` Jason Gunthorpe 2020-09-17 17:31 ` Jason Gunthorpe 2020-09-17 18:17 ` Jacob Pan (Jun) 2020-09-17 18:17 ` Jacob Pan (Jun) 2020-09-18 3:58 ` Jason Wang 2020-09-18 3:58 ` Jason Wang 2020-09-16 2:29 ` Jason Wang 2020-09-16 2:29 ` Jason Wang
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