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From: Jean-Philippe Brucker <jean-philippe.brucker@arm.com>
To: Auger Eric <eric.auger@redhat.com>,
	Jonathan Cameron <jonathan.cameron@huawei.com>,
	Jacob Pan <jacob.jun.pan@linux.intel.com>
Cc: Yi L <yi.l.liu@linux.intel.com>,
	"Tian, Kevin" <kevin.tian@intel.com>,
	Alex Williamson <alex.williamson@redhat.com>,
	Raj Ashok <ashok.raj@intel.com>,
	Liu@mail.linuxfoundation.org, LKML <linux-kernel@vger.kernel.org>,
	iommu@lists.linux-foundation.org,
	Andriy Shevchenko <andriy.shevchenko@linux.intel.com>,
	David Woodhouse <dwmw2@infradead.org>
Subject: Re: [PATCH v4 08/22] iommu: Introduce attach/detach_pasid_table API
Date: Mon, 24 Jun 2019 16:23:10 +0100
Message-ID: <e23414a4-698d-e7ed-d1eb-f680992e7deb@arm.com> (raw)
In-Reply-To: <c6e2d65b-8181-3627-f454-d491a738b6ee@redhat.com>

On 24/06/2019 16:06, Auger Eric wrote:
> Hi,
> 
> On 6/18/19 5:41 PM, Jonathan Cameron wrote:
>> On Sun, 9 Jun 2019 06:44:08 -0700
>> Jacob Pan <jacob.jun.pan@linux.intel.com> wrote:
>>
>>> In virtualization use case, when a guest is assigned
>>> a PCI host device, protected by a virtual IOMMU on the guest,
>>> the physical IOMMU must be programmed to be consistent with
>>> the guest mappings. If the physical IOMMU supports two
>>> translation stages it makes sense to program guest mappings
>>> onto the first stage/level (ARM/Intel terminology) while the host
>>> owns the stage/level 2.
>>>
>>> In that case, it is mandated to trap on guest configuration
>>> settings and pass those to the physical iommu driver.
>>>
>>> This patch adds a new API to the iommu subsystem that allows
>>> to set/unset the pasid table information.
>>>
>>> A generic iommu_pasid_table_config struct is introduced in
>>> a new iommu.h uapi header. This is going to be used by the VFIO
>>> user API.
>>
>> Another case where strictly speaking stuff is introduced that this series
>> doesn't use.  I don't know what the plans are to merge the various
>> related series though so this might make sense in general. Right now
>> it just bloats this series a bit..
> 
> I am now the only user of this API in
> [PATCH v8 00/29] SMMUv3 Nested Stage Setup
> (https://patchwork.kernel.org/cover/10961733/).
> 
> This can live in this series or Jean-Philippe do you intend to keep on
> maintaining it in your api branch?

No, I think it makes sense to keep it within your series

Thanks,
Jean
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Thread overview: 64+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-06-09 13:44 [PATCH v4 00/22] Shared virtual address IOMMU and VT-d support Jacob Pan
2019-06-09 13:44 ` [PATCH v4 01/22] driver core: Add per device iommu param Jacob Pan
2019-06-09 13:44 ` [PATCH v4 02/22] iommu: Introduce device fault data Jacob Pan
2019-06-18 15:42   ` Jonathan Cameron
2019-06-09 13:44 ` [PATCH v4 03/22] iommu: Introduce device fault report API Jacob Pan
2019-06-18 15:41   ` Jonathan Cameron
2019-06-09 13:44 ` [PATCH v4 04/22] iommu: Add recoverable fault reporting Jacob Pan
2019-06-18 15:44   ` Jonathan Cameron
2019-06-09 13:44 ` [PATCH v4 05/22] iommu: Add a timeout parameter for PRQ response Jacob Pan
2019-06-09 13:44 ` [PATCH v4 06/22] trace/iommu: Add sva trace events Jacob Pan
2019-06-09 13:44 ` [PATCH v4 07/22] iommu: Use device fault trace event Jacob Pan
2019-06-09 13:44 ` [PATCH v4 08/22] iommu: Introduce attach/detach_pasid_table API Jacob Pan
2019-06-18 15:41   ` Jonathan Cameron
2019-06-24 15:06     ` Auger Eric
2019-06-24 15:23       ` Jean-Philippe Brucker [this message]
2019-06-09 13:44 ` [PATCH v4 09/22] iommu: Introduce cache_invalidate API Jacob Pan
2019-06-18 15:41   ` Jonathan Cameron
2019-06-09 13:44 ` [PATCH v4 10/22] iommu: Fix compile error without IOMMU_API Jacob Pan
2019-06-18 14:10   ` Jonathan Cameron
2019-06-24 22:28     ` Jacob Pan
2019-06-09 13:44 ` [PATCH v4 11/22] iommu: Introduce guest PASID bind function Jacob Pan
2019-06-18 15:36   ` Jean-Philippe Brucker
2019-06-24 22:24     ` Jacob Pan
2019-07-16 16:44   ` Auger Eric
2019-08-05 21:02     ` Jacob Pan
2019-08-05 23:13     ` Jacob Pan
2019-06-09 13:44 ` [PATCH v4 12/22] iommu: Add I/O ASID allocator Jacob Pan
2019-06-18 16:50   ` Jonathan Cameron
2019-06-25 18:55     ` Jacob Pan
2019-06-09 13:44 ` [PATCH v4 13/22] iommu/vt-d: Enlightened PASID allocation Jacob Pan
2019-07-16  9:29   ` Auger Eric
2019-08-13 16:57     ` Jacob Pan
2019-06-09 13:44 ` [PATCH v4 14/22] iommu/vt-d: Add custom allocator for IOASID Jacob Pan
2019-07-16  9:30   ` Auger Eric
2019-08-05 20:02     ` Jacob Pan
2019-06-09 13:44 ` [PATCH v4 15/22] iommu/vt-d: Replace Intel specific PASID allocator with IOASID Jacob Pan
2019-06-18 15:57   ` Jonathan Cameron
2019-06-24 21:36     ` Jacob Pan
2019-06-27  1:53   ` Lu Baolu
2019-06-27 15:40     ` Jacob Pan
2019-06-09 13:44 ` [PATCH v4 16/22] iommu/vt-d: Move domain helper to header Jacob Pan
2019-07-16  9:33   ` Auger Eric
2019-06-09 13:44 ` [PATCH v4 17/22] iommu/vt-d: Avoid duplicated code for PASID setup Jacob Pan
2019-06-18 16:03   ` Jonathan Cameron
2019-06-24 23:44     ` Jacob Pan
2019-07-16  9:52   ` Auger Eric
2019-06-09 13:44 ` [PATCH v4 18/22] iommu/vt-d: Add nested translation helper function Jacob Pan
2019-06-09 13:44 ` [PATCH v4 19/22] iommu/vt-d: Clean up for SVM device list Jacob Pan
2019-06-18 16:42   ` Jonathan Cameron
2019-06-24 23:59     ` Jacob Pan
2019-06-09 13:44 ` [PATCH v4 20/22] iommu/vt-d: Add bind guest PASID support Jacob Pan
2019-06-18 16:44   ` Jonathan Cameron
2019-06-24 22:41     ` Jacob Pan
2019-06-27  2:50   ` Lu Baolu
2019-06-27 20:22     ` Jacob Pan
2019-07-05  2:21       ` Lu Baolu
2019-08-14 17:20         ` Jacob Pan
2019-07-16 16:45   ` Auger Eric
2019-07-16 17:04     ` Raj, Ashok
2019-07-18  7:47       ` Auger Eric
2019-06-09 13:44 ` [PATCH v4 21/22] iommu/vt-d: Support flushing more translation cache types Jacob Pan
2019-07-18  8:35   ` Auger Eric
2019-08-14 20:17     ` Jacob Pan
2019-06-09 13:44 ` [PATCH v4 22/22] iommu/vt-d: Add svm/sva invalidate function Jacob Pan

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