From: "joro@8bytes.org" <joro@8bytes.org>
To: "Tian, Kevin" <kevin.tian@intel.com>
Cc: Jason Wang <jasowang@redhat.com>,
"Liu, Yi L" <yi.l.liu@intel.com>,
"alex.williamson@redhat.com" <alex.williamson@redhat.com>,
"eric.auger@redhat.com" <eric.auger@redhat.com>,
"baolu.lu@linux.intel.com" <baolu.lu@linux.intel.com>,
"jacob.jun.pan@linux.intel.com" <jacob.jun.pan@linux.intel.com>,
"Raj, Ashok" <ashok.raj@intel.com>,
"Tian, Jun J" <jun.j.tian@intel.com>,
"Sun, Yi Y" <yi.y.sun@intel.com>,
"jean-philippe@linaro.org" <jean-philippe@linaro.org>,
"peterx@redhat.com" <peterx@redhat.com>,
"Wu, Hao" <hao.wu@intel.com>,
"stefanha@gmail.com" <stefanha@gmail.com>,
"iommu@lists.linux-foundation.org"
<iommu@lists.linux-foundation.org>,
"kvm@vger.kernel.org" <kvm@vger.kernel.org>,
Jason Gunthorpe <jgg@nvidia.com>,
"Michael S. Tsirkin" <mst@redhat.com>
Subject: Re: (proposal) RE: [PATCH v7 00/16] vfio: expose virtual Shared Virtual Addressing to VMs
Date: Tue, 3 Nov 2020 10:52:09 +0100 [thread overview]
Message-ID: <20201103095208.GA22888@8bytes.org> (raw)
In-Reply-To: <MWHPR11MB1645CFB0C594933E92A844AC8C070@MWHPR11MB1645.namprd11.prod.outlook.com>
On Mon, Oct 12, 2020 at 08:38:54AM +0000, Tian, Kevin wrote:
> > From: Jason Wang <jasowang@redhat.com>
> > Jason suggest something like /dev/sva. There will be a lot of other
> > subsystems that could benefit from this (e.g vDPA).
Honestly, I fail to see the benefit of offloading these IOMMU specific
setup tasks to user-space.
The ways PASID and the device partitioning it allows are used are very
device specific. A GPU will be partitioned completly different than a
network card. So the device drivers should use the (v)SVA APIs to setup
the partitioning in a way which makes sense for the device.
And VFIO is of course a user by itself, as it allows assigning device
partitions to guests. Or even allow assigning complete devices and allow
the guests to partition it themselfes.
So having said this, what is the benefit of exposing those SVA internals
to user-space?
Regards,
Joerg
WARNING: multiple messages have this Message-ID (diff)
From: "joro@8bytes.org" <joro@8bytes.org>
To: "Tian, Kevin" <kevin.tian@intel.com>
Cc: "jean-philippe@linaro.org" <jean-philippe@linaro.org>,
"Raj, Ashok" <ashok.raj@intel.com>,
"kvm@vger.kernel.org" <kvm@vger.kernel.org>,
"iommu@lists.linux-foundation.org"
<iommu@lists.linux-foundation.org>,
"stefanha@gmail.com" <stefanha@gmail.com>,
Jason Wang <jasowang@redhat.com>,
"Michael S. Tsirkin" <mst@redhat.com>,
"Sun, Yi Y" <yi.y.sun@intel.com>,
"alex.williamson@redhat.com" <alex.williamson@redhat.com>,
Jason Gunthorpe <jgg@nvidia.com>, "Wu, Hao" <hao.wu@intel.com>,
"Tian, Jun J" <jun.j.tian@intel.com>
Subject: Re: (proposal) RE: [PATCH v7 00/16] vfio: expose virtual Shared Virtual Addressing to VMs
Date: Tue, 3 Nov 2020 10:52:09 +0100 [thread overview]
Message-ID: <20201103095208.GA22888@8bytes.org> (raw)
In-Reply-To: <MWHPR11MB1645CFB0C594933E92A844AC8C070@MWHPR11MB1645.namprd11.prod.outlook.com>
On Mon, Oct 12, 2020 at 08:38:54AM +0000, Tian, Kevin wrote:
> > From: Jason Wang <jasowang@redhat.com>
> > Jason suggest something like /dev/sva. There will be a lot of other
> > subsystems that could benefit from this (e.g vDPA).
Honestly, I fail to see the benefit of offloading these IOMMU specific
setup tasks to user-space.
The ways PASID and the device partitioning it allows are used are very
device specific. A GPU will be partitioned completly different than a
network card. So the device drivers should use the (v)SVA APIs to setup
the partitioning in a way which makes sense for the device.
And VFIO is of course a user by itself, as it allows assigning device
partitions to guests. Or even allow assigning complete devices and allow
the guests to partition it themselfes.
So having said this, what is the benefit of exposing those SVA internals
to user-space?
Regards,
Joerg
_______________________________________________
iommu mailing list
iommu@lists.linux-foundation.org
https://lists.linuxfoundation.org/mailman/listinfo/iommu
next prev parent reply other threads:[~2020-11-03 9:52 UTC|newest]
Thread overview: 110+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-10-12 8:38 (proposal) RE: [PATCH v7 00/16] vfio: expose virtual Shared Virtual Addressing to VMs Tian, Kevin
2020-10-12 8:38 ` Tian, Kevin
2020-10-13 6:22 ` Jason Wang
2020-10-13 6:22 ` Jason Wang
2020-10-14 3:08 ` Tian, Kevin
2020-10-14 3:08 ` Tian, Kevin
2020-10-14 23:10 ` Alex Williamson
2020-10-14 23:10 ` Alex Williamson
2020-10-15 7:02 ` Jason Wang
2020-10-15 7:02 ` Jason Wang
2020-10-15 6:52 ` Jason Wang
2020-10-15 6:52 ` Jason Wang
2020-10-15 7:58 ` Tian, Kevin
2020-10-15 7:58 ` Tian, Kevin
2020-10-15 8:40 ` Jason Wang
2020-10-15 8:40 ` Jason Wang
2020-10-15 10:14 ` Liu, Yi L
2020-10-15 10:14 ` Liu, Yi L
2020-10-20 6:18 ` Jason Wang
2020-10-20 6:18 ` Jason Wang
2020-10-20 8:19 ` Liu, Yi L
2020-10-20 8:19 ` Liu, Yi L
2020-10-20 9:19 ` Jason Wang
2020-10-20 9:19 ` Jason Wang
2020-10-20 9:40 ` Liu, Yi L
2020-10-20 9:40 ` Liu, Yi L
2020-10-20 13:54 ` Jason Gunthorpe
2020-10-20 13:54 ` Jason Gunthorpe
2020-10-20 14:00 ` Liu, Yi L
2020-10-20 14:00 ` Liu, Yi L
2020-10-20 14:05 ` Jason Gunthorpe
2020-10-20 14:05 ` Jason Gunthorpe
2020-10-20 14:09 ` Liu, Yi L
2020-10-20 14:09 ` Liu, Yi L
2020-10-13 10:27 ` Jean-Philippe Brucker
2020-10-13 10:27 ` Jean-Philippe Brucker
2020-10-14 2:11 ` Tian, Kevin
2020-10-14 2:11 ` Tian, Kevin
2020-10-14 3:16 ` Tian, Kevin
2020-10-14 3:16 ` Tian, Kevin
2020-10-16 15:36 ` Jason Gunthorpe
2020-10-16 15:36 ` Jason Gunthorpe
2020-10-19 8:39 ` Liu, Yi L
2020-10-19 8:39 ` Liu, Yi L
2020-10-19 14:25 ` Jason Gunthorpe
2020-10-19 14:25 ` Jason Gunthorpe
2020-10-20 10:21 ` Liu, Yi L
2020-10-20 10:21 ` Liu, Yi L
2020-10-20 14:02 ` Jason Gunthorpe
2020-10-20 14:02 ` Jason Gunthorpe
2020-10-20 14:19 ` Liu, Yi L
2020-10-20 14:19 ` Liu, Yi L
2020-10-21 2:21 ` Jason Wang
2020-10-21 2:21 ` Jason Wang
2020-10-20 16:24 ` Raj, Ashok
2020-10-20 16:24 ` Raj, Ashok
2020-10-20 17:03 ` Jason Gunthorpe
2020-10-20 17:03 ` Jason Gunthorpe
2020-10-20 19:51 ` Raj, Ashok
2020-10-20 19:51 ` Raj, Ashok
2020-10-20 19:55 ` Jason Gunthorpe
2020-10-20 19:55 ` Jason Gunthorpe
2020-10-20 20:08 ` Raj, Ashok
2020-10-20 20:08 ` Raj, Ashok
2020-10-20 20:14 ` Jason Gunthorpe
2020-10-20 20:14 ` Jason Gunthorpe
2020-10-20 20:27 ` Raj, Ashok
2020-10-20 20:27 ` Raj, Ashok
2020-10-21 11:48 ` Jason Gunthorpe
2020-10-21 11:48 ` Jason Gunthorpe
2020-10-21 17:51 ` Raj, Ashok
2020-10-21 17:51 ` Raj, Ashok
2020-10-21 18:24 ` Jason Gunthorpe
2020-10-21 18:24 ` Jason Gunthorpe
2020-10-21 20:03 ` Raj, Ashok
2020-10-21 20:03 ` Raj, Ashok
2020-10-21 23:32 ` Jason Gunthorpe
2020-10-21 23:32 ` Jason Gunthorpe
2020-10-21 23:53 ` Raj, Ashok
2020-10-21 23:53 ` Raj, Ashok
2020-10-22 2:55 ` Jason Wang
2020-10-22 2:55 ` Jason Wang
2020-10-22 3:54 ` Liu, Yi L
2020-10-22 3:54 ` Liu, Yi L
2020-10-22 4:38 ` Jason Wang
2020-10-22 4:38 ` Jason Wang
2020-11-03 9:52 ` joro [this message]
2020-11-03 9:52 ` joro
2020-11-03 12:56 ` Jason Gunthorpe
2020-11-03 12:56 ` Jason Gunthorpe
2020-11-03 13:18 ` joro
2020-11-03 13:18 ` joro
2020-11-03 13:23 ` Jason Gunthorpe
2020-11-03 13:23 ` Jason Gunthorpe
2020-11-03 14:03 ` joro
2020-11-03 14:03 ` joro
2020-11-03 14:06 ` Jason Gunthorpe
2020-11-03 14:06 ` Jason Gunthorpe
2020-11-03 14:35 ` joro
2020-11-03 14:35 ` joro
2020-11-03 15:22 ` Jason Gunthorpe
2020-11-03 15:22 ` Jason Gunthorpe
2020-11-03 16:55 ` joro
2020-11-03 16:55 ` joro
2020-11-03 17:48 ` Jason Gunthorpe
2020-11-03 17:48 ` Jason Gunthorpe
2020-11-03 19:14 ` joro
2020-11-03 19:14 ` joro
2020-11-04 19:29 ` Jason Gunthorpe
2020-11-04 19:29 ` Jason Gunthorpe
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