From: "Tian, Kevin" <kevin.tian@intel.com>
To: Lu Baolu <baolu.lu@linux.intel.com>,
Jacob Pan <jacob.jun.pan@linux.intel.com>,
Christoph Hellwig <hch@infradead.org>
Cc: Jean-Philippe Brucker <jean-philippe@linaro.org>,
"Jiang, Dave" <dave.jiang@intel.com>,
"Raj, Ashok" <ashok.raj@intel.com>,
"kvm@vger.kernel.org" <kvm@vger.kernel.org>,
Cornelia Huck <cohuck@redhat.com>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"iommu@lists.linux-foundation.org"
<iommu@lists.linux-foundation.org>,
Alex Williamson <alex.williamson@redhat.com>,
Robin Murphy <robin.murphy@arm.com>
Subject: RE: [PATCH v3 4/4] vfio/type1: Use iommu_aux_at(de)tach_group() APIs
Date: Wed, 15 Jul 2020 01:23:26 +0000 [thread overview]
Message-ID: <MWHPR11MB1645BB5C265C520EEA005B078C7E0@MWHPR11MB1645.namprd11.prod.outlook.com> (raw)
In-Reply-To: <ac4507d5-a5fc-d078-9bfc-f9e9fd1244e7@linux.intel.com>
> From: Lu Baolu <baolu.lu@linux.intel.com>
> Sent: Wednesday, July 15, 2020 9:00 AM
>
> Hi Christoph and Jacob,
>
> On 7/15/20 12:29 AM, Jacob Pan wrote:
> > On Tue, 14 Jul 2020 09:25:14 +0100
> > Christoph Hellwig<hch@infradead.org> wrote:
> >
> >> On Tue, Jul 14, 2020 at 01:57:03PM +0800, Lu Baolu wrote:
> >>> Replace iommu_aux_at(de)tach_device() with
> >>> iommu_aux_at(de)tach_group(). It also saves the
> >>> IOMMU_DEV_FEAT_AUX-capable physcail device in the vfio_group data
> >>> structure so that it could be reused in other places.
> >> This removes the last user of iommu_aux_attach_device and
> >> iommu_aux_detach_device, which can be removed now.
> > it is still used in patch 2/4 inside iommu_aux_attach_group(), right?
> >
>
> There is a need to use this interface. For example, an aux-domain is
> attached to a subset of a physical device and used in the kernel. In
> this usage scenario, there's no need to use vfio/mdev. The device driver
> could just allocate an aux-domain and call iommu_aux_attach_device() to
> setup the iommu.
>
and here is one example usage for adding per-instance pagetables for drm/msm:
https://lore.kernel.org/lkml/20200626200414.14382-5-jcrouse@codeaurora.org/
Thanks
Kevin
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next prev parent reply other threads:[~2020-07-15 1:23 UTC|newest]
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-07-14 5:56 [PATCH v3 0/4] iommu aux-domain APIs extensions Lu Baolu
2020-07-14 5:57 ` [PATCH v3 1/4] iommu: Check IOMMU_DEV_FEAT_AUX feature in aux api's Lu Baolu
2020-07-29 20:03 ` Alex Williamson
2020-07-30 1:46 ` Lu Baolu
2020-07-14 5:57 ` [PATCH v3 2/4] iommu: Add iommu_aux_at(de)tach_group() Lu Baolu
2020-07-14 16:39 ` Jacob Pan
2020-07-15 0:47 ` Lu Baolu
2020-07-15 16:01 ` Jacob Pan
2020-07-16 1:07 ` Lu Baolu
2020-07-29 20:03 ` Alex Williamson
2020-07-29 23:34 ` Tian, Kevin
2020-07-30 19:46 ` Alex Williamson
2020-07-31 5:47 ` Lu Baolu
2020-07-31 18:05 ` Alex Williamson
2020-08-03 1:57 ` Lu Baolu
2020-07-14 5:57 ` [PATCH v3 3/4] iommu: Add iommu_aux_get_domain_for_dev() Lu Baolu
2020-07-29 20:25 ` Alex Williamson
2020-07-29 23:49 ` Tian, Kevin
2020-07-30 20:17 ` Alex Williamson
2020-07-31 0:26 ` Tian, Kevin
2020-07-31 2:17 ` Tian, Kevin
2020-07-31 6:30 ` Lu Baolu
2020-07-31 18:14 ` Alex Williamson
2020-08-03 2:15 ` Lu Baolu
2020-07-14 5:57 ` [PATCH v3 4/4] vfio/type1: Use iommu_aux_at(de)tach_group() APIs Lu Baolu
2020-07-14 8:25 ` Christoph Hellwig
2020-07-14 16:29 ` Jacob Pan
2020-07-15 1:00 ` Lu Baolu
2020-07-15 1:23 ` Tian, Kevin [this message]
2020-07-29 20:32 ` Alex Williamson
2020-07-30 2:41 ` Lu Baolu
2020-07-30 21:17 ` Alex Williamson
2020-07-31 1:37 ` Lu Baolu
2020-07-30 9:36 ` Liu, Yi L
2020-07-31 1:39 ` Lu Baolu
2020-07-23 13:55 ` [PATCH v3 0/4] iommu aux-domain APIs extensions Lu Baolu
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