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Message-ID: <AM5PR0401MB254547FE747461B3332721FC9A790@AM5PR0401MB2545.eurprd04.prod.outlook.com>
Date: Thu, 12 Jan 2017 03:59:44 +0000
From: Bharat Bhushan <bharat.bhushan@....com>
To: Eric Auger <eric.auger@...hat.com>,
"eric.auger.pro@...il.com" <eric.auger.pro@...il.com>,
"christoffer.dall@...aro.org" <christoffer.dall@...aro.org>,
"marc.zyngier@....com" <marc.zyngier@....com>,
"robin.murphy@....com" <robin.murphy@....com>,
"alex.williamson@...hat.com" <alex.williamson@...hat.com>,
"will.deacon@....com" <will.deacon@....com>,
"joro@...tes.org" <joro@...tes.org>,
"tglx@...utronix.de" <tglx@...utronix.de>,
"jason@...edaemon.net" <jason@...edaemon.net>,
"linux-arm-kernel@...ts.infradead.org"
<linux-arm-kernel@...ts.infradead.org>
CC: "kvm@...r.kernel.org" <kvm@...r.kernel.org>,
"drjones@...hat.com" <drjones@...hat.com>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"pranav.sawargaonkar@...il.com" <pranav.sawargaonkar@...il.com>,
"iommu@...ts.linux-foundation.org" <iommu@...ts.linux-foundation.org>,
"punit.agrawal@....com" <punit.agrawal@....com>,
Diana Madalina Craciun <diana.craciun@....com>,
"gpkulkarni@...il.com" <gpkulkarni@...il.com>,
"shankerd@...eaurora.org" <shankerd@...eaurora.org>,
"geethasowjanya.akula@...il.com" <geethasowjanya.akula@...il.com>
Subject: RE: [PATCH v8 00/18] KVM PCIe/MSI passthrough on ARM/ARM64 and IOVA
reserved regions
> -----Original Message-----
> From: Eric Auger [mailto:eric.auger@...hat.com]
> Sent: Wednesday, January 11, 2017 3:12 PM
> 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 Madalina
> Craciun <diana.craciun@....com>; gpkulkarni@...il.com;
> shankerd@...eaurora.org; Bharat Bhushan <bharat.bhushan@....com>;
> geethasowjanya.akula@...il.com
> Subject: [PATCH v8 00/18] KVM PCIe/MSI passthrough on ARM/ARM64 and
> IOVA reserved regions
>
> 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
This series is tested on NXP platform, if you want you can add my tested by
Tested-by: Bharat Bhushan <bharat.bhushan@....com>
Thanks
-Bharat
>
> istory:
>
> PATCHv7 -> PATCHv8
> - take into account Marc's comments and apply his R-b
> - remove iommu_group_remove_file call in iommu_group_release
> - add Will's A-b
> - removed [PATCH v7 01/19] iommu/dma: Implement PCI allocation
> optimisation and updated iommu/dma: Allow MSI-only cookies
> as per Robin's indications
>
> PATCHv6 -> PATCHv7:
> - iommu/dma: Implement PCI allocation optimisation was added to apply
> iommu/dma: Allow MSI-only cookies
> - report Intel RMRR as direct-mapped regions
> - report the type in the iommu group sysfs reserved_regions file
> - do not merge regions of different types when building the list
> of reserved regions
> - intgeration Robin's "iommu/dma: Allow MSI-only cookies" last
> version
> - update Documentation/ABI/testing/sysfs-kernel-iommu_groups
> - rename IOMMU_RESV_NOMAP into IOMMU_RESV_RESERVED
>
> PATCHv5 -> PATCHv6
> - Introduce IRQ_DOMAIN_FLAG_MSI as suggested by Marc
> - irq_domain_is_msi, irq_domain_is_msi_remap,
> irq_domain_hierarchical_is_msi_remap,
> - set IRQ_DOMAIN_FLAG_MSI in msi_create_irq_domain
> - fix compil issue on i386
> - rework test at VFIO level
>
> RFCv4 -> PATCHv5
> - fix IRQ security assessment by looking at irq domain parents
> - check DOMAIN_BUS_FSL_MC_MSI irq domains
> - AMD MSI and HT regions are exposed in iommu group sysfs
>
> RFCv3 -> RFCv4:
> - arm-smmu driver does not register PCI host bridge windows as
> reserved regions anymore
> - Implement reserved region get/put callbacks also in arm-smmuv3
> - take the iommu_group lock on iommu_get_group_resv_regions
> - add a type field in iommu_resv_region instead of using prot
> - init the region list_head in iommu_alloc_resv_region, also
> add type parameter
> - iommu_insert_resv_region manage overlaps and sort reserved
> windows
> - address IRQ safety assessment by enumerating all the MSI irq
> domains and checking the MSI_REMAP flag
> - update Documentation/ABI/testing/sysfs-kernel-iommu_groups
>
> 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 (17):
> iommu: Rename iommu_dm_regions into iommu_resv_regions
> iommu: Add a new type field in iommu_resv_region
> iommu: iommu_alloc_resv_region
> iommu: Only map direct mapped 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/amd: Declare MSI and HT regions as reserved IOVA regions
> iommu/arm-smmu: Implement reserved region get/put callbacks
> iommu/arm-smmu-v3: Implement reserved region get/put callbacks
> irqdomain: Add irq domain MSI and MSI_REMAP flags
> genirq/msi: Set IRQ_DOMAIN_FLAG_MSI on MSI domain creation
> irqdomain: irq_domain_check_msi_remap
> irqchip/gicv3-its: Sets IRQ_DOMAIN_FLAG_MSI_REMAP
> vfio/type1: Allow transparent MSI IOVA allocation
> vfio/type1: Check MSI remapping at irq domain level
> iommu/arm-smmu: Do not advertise IOMMU_CAP_INTR_REMAP anymore
>
> Robin Murphy (1):
> iommu/dma: Allow MSI-only cookies
>
> .../ABI/testing/sysfs-kernel-iommu_groups | 12 ++
> drivers/iommu/amd_iommu.c | 54 ++++---
> drivers/iommu/arm-smmu-v3.c | 30 +++-
> drivers/iommu/arm-smmu.c | 30 +++-
> drivers/iommu/dma-iommu.c | 119 +++++++++++---
> drivers/iommu/intel-iommu.c | 92 ++++++++---
> drivers/iommu/iommu.c | 177 +++++++++++++++++++--
> drivers/irqchip/irq-gic-v3-its.c | 1 +
> drivers/vfio/vfio_iommu_type1.c | 37 ++++-
> include/linux/dma-iommu.h | 6 +
> include/linux/iommu.h | 46 ++++--
> include/linux/irqdomain.h | 36 +++++
> kernel/irq/irqdomain.c | 36 +++++
> kernel/irq/msi.c | 4 +-
> 14 files changed, 587 insertions(+), 93 deletions(-)
>
> --
> 1.9.1
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