From: Jason Wang <jasowang@redhat.com>
To: Alex Williamson <alex.williamson@redhat.com>,
Jason Gunthorpe <jgg@ziepe.ca>
Cc: "Michael S. Tsirkin" <mst@redhat.com>,
Parav Pandit <parav@mellanox.com>,
Jeff Kirsher <jeffrey.t.kirsher@intel.com>,
davem@davemloft.net, gregkh@linuxfoundation.org,
Dave Ertman <david.m.ertman@intel.com>,
netdev@vger.kernel.org, linux-rdma@vger.kernel.org,
nhorman@redhat.com, sassmann@redhat.com,
Kiran Patil <kiran.patil@intel.com>,
Tiwei Bie <tiwei.bie@intel.com>
Subject: Re: [net-next v2 1/1] virtual-bus: Implementation of Virtual Bus
Date: Thu, 21 Nov 2019 13:22:50 +0800 [thread overview]
Message-ID: <fb73ceea-afc9-de6e-3a62-ac3bbc345fd2@redhat.com> (raw)
In-Reply-To: <20191120150732.2fffa141@x1.home>
On 2019/11/21 上午6:07, Alex Williamson wrote:
> On Wed, 20 Nov 2019 14:11:08 -0400
> Jason Gunthorpe<jgg@ziepe.ca> wrote:
>
>> On Wed, Nov 20, 2019 at 10:28:56AM -0700, Alex Williamson wrote:
>>>>> Are you objecting the mdev_set_iommu_deivce() stuffs here?
>>>> I'm questioning if it fits the vfio PCI device security model, yes.
>>> The mdev IOMMU backing device model is for when an mdev device has
>>> IOMMU based isolation, either via the PCI requester ID or via requester
>>> ID + PASID. For example, an SR-IOV VF may be used by a vendor to
>>> provide IOMMU based translation and isolation, but the VF may not be
>>> complete otherwise to provide a self contained device. It might
>>> require explicit coordination and interaction with the PF driver, ie.
>>> mediation.
>> In this case the PF does not look to be involved, the ICF kernel
>> driver is only manipulating registers in the same VF that the vfio
>> owns the IOMMU for.
> The mdev_set_iommu_device() call is probably getting caught up in the
> confusion of mdev as it exists today being vfio specific. What I
> described in my reply is vfio specific. The vfio iommu backend is
> currently the only code that calls mdev_get_iommu_device(), JasonW
> doesn't use it in the virtio-mdev code, so this seems like a stray vfio
> specific interface that's setup by IFC but never used.
>
It will be used by userspace driver through vhost-mdev code for having a
correct IOMMU when doing DMA mappings.
Thanks
next prev parent reply other threads:[~2019-11-21 5:23 UTC|newest]
Thread overview: 86+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-11-15 22:33 [net-next v2 1/1] virtual-bus: Implementation of Virtual Bus Jeff Kirsher
2019-11-15 23:25 ` Parav Pandit
2019-11-19 3:58 ` Ertman, David M
2019-11-19 4:31 ` Parav Pandit
2019-11-19 4:39 ` Parav Pandit
2019-11-19 17:46 ` Ertman, David M
2019-11-19 18:39 ` Jason Gunthorpe
2019-11-19 17:44 ` Ertman, David M
2019-11-19 4:08 ` Jason Wang
2019-11-19 4:36 ` Parav Pandit
2019-11-19 6:51 ` Jason Wang
2019-11-19 7:13 ` Parav Pandit
2019-11-19 7:37 ` Jason Wang
2019-11-19 15:14 ` Parav Pandit
2019-11-20 3:15 ` Jason Wang
2019-11-20 3:38 ` Parav Pandit
2019-11-20 4:07 ` Jason Wang
2019-11-20 13:41 ` Jason Gunthorpe
2019-11-21 4:06 ` Jason Wang
2019-11-20 8:52 ` Michael S. Tsirkin
2019-11-20 12:03 ` Jiri Pirko
2019-11-19 16:46 ` Jason Gunthorpe
2019-11-19 18:58 ` Michael S. Tsirkin
2019-11-19 19:03 ` Jason Gunthorpe
2019-11-19 21:34 ` Michael S. Tsirkin
2019-11-19 19:15 ` Jason Gunthorpe
2019-11-19 21:33 ` Michael S. Tsirkin
2019-11-19 23:10 ` Jason Gunthorpe
2019-11-20 0:16 ` Michael S. Tsirkin
2019-11-20 1:46 ` Jason Gunthorpe
2019-11-20 3:59 ` Jason Wang
2019-11-20 5:34 ` Jason Wang
2019-11-20 13:38 ` Jason Gunthorpe
2019-11-20 14:15 ` Michael S. Tsirkin
2019-11-20 17:28 ` Alex Williamson
2019-11-20 18:11 ` Jason Gunthorpe
2019-11-20 22:07 ` Alex Williamson
2019-11-20 22:39 ` Parav Pandit
2019-11-21 8:17 ` Jason Wang
2019-11-21 3:03 ` Jason Gunthorpe
2019-11-21 4:24 ` Michael S. Tsirkin
2019-11-21 13:44 ` Jason Gunthorpe
2019-11-23 16:50 ` Michael S. Tsirkin
2019-11-21 7:21 ` Jason Wang
2019-11-21 14:17 ` Jason Gunthorpe
2019-11-22 8:45 ` Jason Wang
2019-11-22 18:02 ` Jason Gunthorpe
2019-11-23 4:39 ` Tiwei Bie
2019-11-23 23:09 ` Jason Gunthorpe
2019-11-24 11:00 ` Michael S. Tsirkin
2019-11-24 14:56 ` Tiwei Bie
2019-11-25 0:07 ` Jason Gunthorpe
2019-11-24 14:51 ` Tiwei Bie
2019-11-24 15:07 ` Michael S. Tsirkin
2019-11-25 0:09 ` Jason Gunthorpe
2019-11-25 12:59 ` Jason Wang
2019-11-23 16:48 ` Michael S. Tsirkin
2019-11-21 5:22 ` Jason Wang [this message]
2019-11-21 6:59 ` Jason Wang
2019-11-21 3:52 ` Jason Wang
2019-11-20 7:38 ` Michael S. Tsirkin
2019-11-20 13:03 ` Jason Gunthorpe
2019-11-20 13:43 ` Michael S. Tsirkin
2019-11-20 14:30 ` Jason Gunthorpe
2019-11-20 14:57 ` Michael S. Tsirkin
2019-11-20 16:45 ` Jason Gunthorpe
2019-11-20 22:05 ` Michael S. Tsirkin
2019-11-21 1:38 ` Jason Gunthorpe
2019-11-21 4:53 ` Jason Wang
2019-11-20 3:29 ` Jason Wang
2019-11-20 3:24 ` Jason Wang
2019-11-20 13:33 ` Jason Gunthorpe
2019-11-21 3:57 ` Jason Wang
2019-11-21 15:10 ` Martin Habets
2019-11-22 9:13 ` Jason Wang
2019-11-22 16:19 ` Parav Pandit
2019-11-26 12:26 ` Martin Habets
2019-11-27 10:58 ` Jason Wang
2019-11-27 11:03 ` Jason Wang
2019-11-15 23:42 ` Parav Pandit
2019-11-18 7:48 ` Greg KH
2019-11-18 22:57 ` Ertman, David M
2019-11-19 8:04 ` Jason Wang
2019-11-19 17:50 ` Ertman, David M
2019-11-18 7:49 ` Greg KH
2019-11-18 22:55 ` Ertman, David M
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