Re: [PATCH v8 00/18] KVM PCIe/MSI passthrough on ARM/ARM64 and IOVA reserved regions

From	Auger Eric <eric.auger@redhat.com>
Newsgroups	linux.kernel
Subject	Re: [PATCH v8 00/18] KVM PCIe/MSI passthrough on ARM/ARM64 and IOVA reserved regions
Date	2017-01-16 10:10 +0100
Message-ID	<t0bsC-6yd-47@gated-at.bofh.it> (permalink)
References	<sYnHz-5fJ-3@gated-at.bofh.it> <sZayB-1yh-5@gated-at.bofh.it>
Organization	linux.* mail to news gateway

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Hi Tomasz,

On 13/01/2017 14:59, Tomasz Nowicki wrote:
> Hello Eric,
> 
> On 11.01.2017 10:41, Eric Auger wrote:
>> Following LPC discussions, we now report reserved regions through
>> the 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 [0xfee00000 - 0xfeefffff] MSI window
>>   as a reserved region and RMRR regions as direct-mapped regions.
>> - the amd-iommu reports device direct mapped regions, the MSI region
>>   and HT regions.
>> - the arm-smmu reports the MSI window (arbitrarily located at
>>   0x8000000 and 1MB large).
>>
>> Unsafe interrupt assignment is tested by enumerating all MSI irq
>> domains and checking MSI remapping is supported in the above hierarchy.
>> This check is done in case we detect the iommu translates MSI
>> (an IOMMU_RESV_MSI window exists). Otherwise the IRQ remapping
>> capability is checked at IOMMU level. Obviously this is a defensive
>> IRQ safety assessment: Assuming there are several MSI controllers
>> in the system and at least one does not implement IRQ remapping,
>> the assignment will be considered as unsafe (even if this controller
>> is not acessible from the assigned devices).
>>
>> The series first patch stems from Robin's branch:
>> http://linux-arm.org/git?p=linux-rm.git;a=shortlog;h=refs/heads/iommu/misc
>>
>>
>> Best Regards
>>
>> Eric
>>
>> Git: complete series available at
>> https://github.com/eauger/linux/tree/v4.10-rc3-reserved-v8
> 
> I tested the series on ThunderX with internal 10G VNIC and Intel IXGBE
> NIC. Please feel free to add my:
> Tested-by: Tomasz Nowicki <tomasz.nowicki@caviumnetworks.com>
Many thanks!

Eric
> 
> Thanks,
> Tomasz
> 
> 
> _______________________________________________
> linux-arm-kernel mailing list
> linux-arm-kernel@lists.infradead.org
> http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

Thread

[PATCH v8 00/18] KVM PCIe/MSI passthrough on ARM/ARM64 and IOVA reserved regions Eric Auger <eric.auger@redhat.com> - 2017-01-11 10:50 +0100
  [PATCH v8 04/18] iommu: iommu_alloc_resv_region Eric Auger <eric.auger@redhat.com> - 2017-01-11 10:50 +0100
  [PATCH v8 03/18] iommu: Add a new type field in iommu_resv_region Eric Auger <eric.auger@redhat.com> - 2017-01-11 10:50 +0100
  [PATCH v8 14/18] irqdomain: irq_domain_check_msi_remap Eric Auger <eric.auger@redhat.com> - 2017-01-11 10:50 +0100
    Re: [PATCH v8 14/18] irqdomain: irq_domain_check_msi_remap Tomasz Nowicki <tn@semihalf.com> - 2017-01-17 14:50 +0100
      Re: [PATCH v8 14/18] irqdomain: irq_domain_check_msi_remap Auger Eric <eric.auger@redhat.com> - 2017-01-17 15:00 +0100
  RE: [PATCH v8 00/18] KVM PCIe/MSI passthrough on ARM/ARM64 and IOVA  reserved regions Bharat Bhushan <bharat.bhushan@nxp.com> - 2017-01-12 05:10 +0100
    Re: [PATCH v8 00/18] KVM PCIe/MSI passthrough on ARM/ARM64 and IOVA  reserved regions Auger Eric <eric.auger@redhat.com> - 2017-01-12 08:50 +0100
  Re: [PATCH v8 00/18] KVM PCIe/MSI passthrough on ARM/ARM64 and IOVA  reserved regions Tomasz Nowicki <tn@semihalf.com> - 2017-01-13 15:00 +0100
    Re: [PATCH v8 00/18] KVM PCIe/MSI passthrough on ARM/ARM64 and IOVA  reserved regions Auger Eric <eric.auger@redhat.com> - 2017-01-16 10:10 +0100
    Re: [PATCH v8 00/18] KVM PCIe/MSI passthrough on ARM/ARM64 and IOVA  reserved regions Auger Eric <eric.auger@redhat.com> - 2017-01-18 14:10 +0100

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