Re: [RFC v3 00/10] KVM PCIe/MSI passthrough on ARM/ARM64 and IOVA reserved regions

[Auger Eric <eric.auger@redhat.com>]

Hi Bharat,

On 18/11/2016 06:34, Bharat Bhushan wrote:
> Hi Eric,
> 
> Have you sent out QEMU side patches based on this new approach? In case I missed please point me the patches? 
Upstream QEMU works fine for PCIe/MSI passthrough on ARM since mach virt
address space does not collide with fixed MSI region.

Thanks

Eric
> 
> Thanks
> -Bharat
> 
>> -----Original Message-----
>> From: iommu-bounces@lists.linux-foundation.org [mailto:iommu-
>> bounces@lists.linux-foundation.org] On Behalf Of Eric Auger
>> Sent: Tuesday, November 15, 2016 6:39 PM
>> To: eric.auger@redhat.com; eric.auger.pro@gmail.com;
>> christoffer.dall@linaro.org; marc.zyngier@arm.com;
>> robin.murphy@arm.com; alex.williamson@redhat.com;
>> will.deacon@arm.com; joro@8bytes.org; tglx@linutronix.de;
>> jason@lakedaemon.net; linux-arm-kernel@lists.infradead.org
>> Cc: drjones@redhat.com; kvm@vger.kernel.org; punit.agrawal@arm.com;
>> linux-kernel@vger.kernel.org; iommu@lists.linux-foundation.org;
>> pranav.sawargaonkar@gmail.com
>> Subject: [RFC v3 00/10] KVM PCIe/MSI passthrough on ARM/ARM64 and
>> IOVA reserved regions
>>
>> 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.
>>
>> 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(-)
>>
>> --
>> 1.9.1
>>
>> _______________________________________________
>> iommu mailing list
>> iommu@lists.linux-foundation.org
>> https://lists.linuxfoundation.org/mailman/listinfo/iommu
> 
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