From: Jason Gunthorpe <jgg@ziepe.ca>
To: Christoph Hellwig <hch@lst.de>
Cc: Alex Williamson <alex.williamson@redhat.com>,
Diana Craciun <diana.craciun@oss.nxp.com>,
Cornelia Huck <cohuck@redhat.com>,
Kirti Wankhede <kwankhede@nvidia.com>,
Eric Auger <eric.auger@redhat.com>,
kvm@vger.kernel.org
Subject: Re: [PATCH 07/14] vfio: simplify iommu group allocation for mediated devices
Date: Wed, 25 Aug 2021 09:34:54 -0300 [thread overview]
Message-ID: <20210825123454.GW543798@ziepe.ca> (raw)
In-Reply-To: <20210825122400.GA16194@lst.de>
On Wed, Aug 25, 2021 at 02:24:00PM +0200, Christoph Hellwig wrote:
> On Wed, Aug 25, 2021 at 09:21:44AM -0300, Jason Gunthorpe wrote:
> > This feature is about creating a device that is not connected to a HW
> > IO page table (at least by the VFIO iommu code) but the IO page table
> > is held in software and accessed by the VFIO driver through the pin
> > API.
> >
> > virtual_iommu is somewhat overloaded with the idea of a vIOMMU created
> > by qemu and stuffed into a guest..
> >
> > "domainless" might work but I also find it confusing that the iommu
> > code uses the word domain to refer to a HW IO page table :\
> >
> > Maybe "sw io page table" ?
>
> Or simply emulated? At least looking at i915 there is very little
> direct connection to the actual hardware, and while I don't understand
> them fully the s390 driver look similar. And the samples are completely
> faked up anyway.
Emulated IO page table works for me!
Jason
next prev parent reply other threads:[~2021-08-25 12:34 UTC|newest]
Thread overview: 56+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-08-24 14:46 cleanup vfio iommu_group creation v2 Christoph Hellwig
2021-08-24 14:46 ` [PATCH 01/14] vfio: Move vfio_iommu_group_get() to vfio_register_group_dev() Christoph Hellwig
2021-08-24 20:25 ` Alex Williamson
2021-08-24 22:50 ` Jason Gunthorpe
2021-08-25 12:43 ` Christoph Hellwig
2021-08-25 15:48 ` Alex Williamson
2021-08-25 16:08 ` Jason Gunthorpe
2021-08-24 14:46 ` [PATCH 02/14] vfio: factor out a vfio_iommu_driver_allowed helper Christoph Hellwig
2021-08-24 23:24 ` Jason Gunthorpe
2021-08-24 14:46 ` [PATCH 03/14] vfio: remove the iommudata check in vfio_noiommu_attach_group Christoph Hellwig
2021-08-24 23:31 ` Jason Gunthorpe
2021-08-24 14:46 ` [PATCH 04/14] vfio: factor out a vfio_group_find_or_alloc helper Christoph Hellwig
2021-08-24 23:40 ` Jason Gunthorpe
2021-08-25 5:30 ` Christoph Hellwig
2021-08-24 14:46 ` [PATCH 05/14] vfio: refactor noiommu group creation Christoph Hellwig
2021-08-24 23:43 ` Jason Gunthorpe
2021-08-24 14:46 ` [PATCH 06/14] vfio: remove the iommudata hack for noiommu groups Christoph Hellwig
2021-08-24 23:45 ` Jason Gunthorpe
2021-08-24 14:46 ` [PATCH 07/14] vfio: simplify iommu group allocation for mediated devices Christoph Hellwig
2021-08-25 0:19 ` Jason Gunthorpe
2021-08-25 5:32 ` Christoph Hellwig
2021-08-25 12:21 ` Jason Gunthorpe
2021-08-25 12:24 ` Christoph Hellwig
2021-08-25 12:34 ` Jason Gunthorpe [this message]
2021-08-25 12:37 ` Christoph Hellwig
2021-08-25 12:45 ` Jason Gunthorpe
2021-08-25 12:50 ` Christoph Hellwig
2021-08-25 12:50 ` Jason Gunthorpe
2021-08-24 14:46 ` [PATCH 08/14] vfio: remove unused method from vfio_iommu_driver_ops Christoph Hellwig
2021-08-25 0:21 ` Jason Gunthorpe
2021-08-24 14:46 ` [PATCH 09/14] vfio: move the vfio_iommu_driver_ops interface out of <linux/vfio.h> Christoph Hellwig
2021-08-25 0:25 ` Jason Gunthorpe
2021-08-24 14:46 ` [PATCH 10/14] vfio: remove the unused mdev iommu hook Christoph Hellwig
2021-08-25 0:25 ` Jason Gunthorpe
2021-08-24 14:46 ` [PATCH 11/14] vfio: clean up the check for mediated device in vfio_iommu_type1 Christoph Hellwig
2021-08-25 0:28 ` Jason Gunthorpe
2021-08-25 5:34 ` Christoph Hellwig
2021-08-25 12:35 ` Jason Gunthorpe
2021-08-24 14:46 ` [PATCH 12/14] vfio/spapr_tce: reject mediated devices Christoph Hellwig
2021-08-25 0:29 ` Jason Gunthorpe
2021-08-24 14:46 ` [PATCH 13/14] vfio/iommu_type1: remove the "external" domain Christoph Hellwig
2021-08-25 0:36 ` Jason Gunthorpe
2021-08-25 5:35 ` Christoph Hellwig
2021-08-24 14:46 ` [PATCH 14/14] vfio/iommu_type1: remove IS_IOMMU_CAP_DOMAIN_IN_CONTAINER Christoph Hellwig
2021-08-25 0:38 ` Jason Gunthorpe
-- strict thread matches above, loose matches on Subject: below --
2021-09-13 7:15 cleanup vfio iommu_group creation v5 Christoph Hellwig
2021-09-13 7:15 ` [PATCH 07/14] vfio: simplify iommu group allocation for mediated devices Christoph Hellwig
2021-09-14 2:23 ` Tian, Kevin
2021-08-26 13:34 cleanup vfio iommu_group creation v4 Christoph Hellwig
2021-08-26 13:34 ` [PATCH 07/14] vfio: simplify iommu group allocation for mediated devices Christoph Hellwig
2021-08-26 17:24 ` Alex Williamson
2021-08-26 22:59 ` Alex Williamson
2021-08-27 2:17 ` Tian, Kevin
2021-08-27 5:42 ` Christoph Hellwig
2021-08-25 16:19 cleanup vfio iommu_group creation v3 Christoph Hellwig
2021-08-25 16:19 ` [PATCH 07/14] vfio: simplify iommu group allocation for mediated devices Christoph Hellwig
2021-08-25 22:31 ` Jason Gunthorpe
2021-08-26 3:10 ` Tian, Kevin
2021-08-11 15:14 cleanup vfio iommu_group creation Christoph Hellwig
2021-08-11 15:14 ` [PATCH 07/14] vfio: simplify iommu group allocation for mediated devices Christoph Hellwig
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