Date:   Wed, 30 Nov 2016 11:14:22 +0100
From:   Auger Eric <eric.auger@...hat.com>
To:     Ganapatrao Kulkarni <gpkulkarni@...il.com>
Cc:     eric.auger.pro@...il.com, christoffer.dall@...aro.org,
        Marc Zyngier <marc.zyngier@....com>, robin.murphy@....com,
        alex.williamson@...hat.com, Will Deacon <will.deacon@....com>,
        joro@...tes.org, "tglx@...utronix.de" <tglx@...utronix.de>,
        Jason Cooper <jason@...edaemon.net>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>, drjones@...hat.com,
        kvm@...r.kernel.org, punit.agrawal@....com,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        diana.craciun@....com, iommu@...ts.linux-foundation.org,
        pranav.sawargaonkar@...il.com
Subject: Re: [RFC v3 00/10] KVM PCIe/MSI passthrough on ARM/ARM64 and IOVA
 reserved regions

Hi Ganapat,

On 30/11/2016 11:04, Ganapatrao Kulkarni wrote:
> Hi Eric,
> 
> in you repo "https://github.com/eauger/linux/tree/v4.9-rc5-reserved-rfc-v3"
> there is 11th patch "pci: Enable overrides for missing ACS capabilities"
> is this patch part of some other series?

Actually this is a very old patch from Alex aimed at working around lack
of PCIe ACS support: https://lkml.org/lkml/2013/5/30/513

Thanks

Eric
> 
> thanks
> Ganapat
> 
> On Wed, Nov 30, 2016 at 3:19 PM, Auger Eric <eric.auger@...hat.com> wrote:
>> Hi,
>>
>> On 15/11/2016 14:09, Eric Auger wrote:
>>> Following LPC discussions, we now report reserved regions through
>>> iommu-group sysfs reserved_regions attribute file.
>>>
>>> Reserved regions are populated through the IOMMU get_resv_region callback
>>> (former get_dm_regions), now implemented by amd-iommu, intel-iommu and
>>> arm-smmu.
>>>
>>> The intel-iommu reports the [FEE0_0000h - FEF0_000h] MSI window as an
>>> IOMMU_RESV_NOMAP reserved region.
>>>
>>> arm-smmu reports the MSI window (arbitrarily located at 0x8000000 and
>>> 1MB large) and the PCI host bridge windows.
>>>
>>> The series integrates a not officially posted patch from Robin:
>>> "iommu/dma: Allow MSI-only cookies".
>>>
>>> This series currently does not address IRQ safety assessment.
>>
>> I will respin this series taking into account Joerg's comment. Does
>> anyone have additional comments or want to put forward some conceptual
>> issues with the current direction and with this implementation?
>>
>> As for the IRQ safety assessment, in a first step I would propose to
>> remove the IOMMU_CAP_INTR_REMAP from arm-smmus and consider the
>> assignment as unsafe. Any objection?
>>
>> Thanks
>>
>> Eric
>>
>>
>>> Best Regards
>>>
>>> Eric
>>>
>>> Git: complete series available at
>>> https://github.com/eauger/linux/tree/v4.9-rc5-reserved-rfc-v3
>>>
>>> History:
>>> RFC v2 -> v3:
>>> - switch to an iommu-group sysfs API
>>> - use new dummy allocator provided by Robin
>>> - dummy allocator initialized by vfio-iommu-type1 after enumerating
>>>   the reserved regions
>>> - at the moment ARM MSI base address/size is left unchanged compared
>>>   to v2
>>> - we currently report reserved regions and not usable IOVA regions as
>>>   requested by Alex
>>>
>>> RFC v1 -> v2:
>>> - fix intel_add_reserved_regions
>>> - add mutex lock/unlock in vfio_iommu_type1
>>>
>>>
>>> Eric Auger (10):
>>>   iommu/dma: Allow MSI-only cookies
>>>   iommu: Rename iommu_dm_regions into iommu_resv_regions
>>>   iommu: Add new reserved IOMMU attributes
>>>   iommu: iommu_alloc_resv_region
>>>   iommu: Do not map reserved regions
>>>   iommu: iommu_get_group_resv_regions
>>>   iommu: Implement reserved_regions iommu-group sysfs file
>>>   iommu/vt-d: Implement reserved region get/put callbacks
>>>   iommu/arm-smmu: Implement reserved region get/put callbacks
>>>   vfio/type1: Get MSI cookie
>>>
>>>  drivers/iommu/amd_iommu.c       |  20 +++---
>>>  drivers/iommu/arm-smmu.c        |  52 +++++++++++++++
>>>  drivers/iommu/dma-iommu.c       | 116 ++++++++++++++++++++++++++-------
>>>  drivers/iommu/intel-iommu.c     |  50 ++++++++++----
>>>  drivers/iommu/iommu.c           | 141 ++++++++++++++++++++++++++++++++++++----
>>>  drivers/vfio/vfio_iommu_type1.c |  26 ++++++++
>>>  include/linux/dma-iommu.h       |   7 ++
>>>  include/linux/iommu.h           |  49 ++++++++++----
>>>  8 files changed, 391 insertions(+), 70 deletions(-)
>>>
>>
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>> linux-arm-kernel@...ts.infradead.org
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