linux-kernel - [RFC v3 00/10] KVM PCIe/MSI passthrough on ARM/ARM64 and IOVA reserved regions

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Date:   Tue, 15 Nov 2016 13:09:13 +0000
From:   Eric Auger <eric.auger@...hat.com>
To:     eric.auger@...hat.com, eric.auger.pro@...il.com,
        christoffer.dall@...aro.org, marc.zyngier@....com,
        robin.murphy@....com, alex.williamson@...hat.com,
        will.deacon@....com, joro@...tes.org, tglx@...utronix.de,
        jason@...edaemon.net, linux-arm-kernel@...ts.infradead.org
Cc:     kvm@...r.kernel.org, drjones@...hat.com,
        linux-kernel@...r.kernel.org, pranav.sawargaonkar@...il.com,
        iommu@...ts.linux-foundation.org, punit.agrawal@....com,
        diana.craciun@....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