Re: [Qemu-devel] [Qemu-arm] [PATCH v7 00/20] ARM SMMUv3 Emulation Support

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

Hi Linu,

On 12/09/2017 08:18, Linu Cherian wrote:
> Hi Eric,
> 
> On Fri Sep 01, 2017 at 07:21:03PM +0200, Eric Auger wrote:
>> This series implements the emulation code for ARM SMMUv3.
>>
>> Changes since v6:
>> - DPDK testpmd now running on guest with 2 assigned VFs
>> - Changed the instantiation method: add the following option to
>>   the QEMU command line
>>   -device smmuv3 # for virtio/vhost use cases
>>   -device smmuv3,caching-mode # for vfio use cases (based on [1])
>> - splitted the series into smaller patches to allow the review
>> - the VFIO integration based on "tlbi-on-map" smmuv3 driver
>>   is isolated from the rest: last 2 patches, not for upstream.
>>   This is shipped for testing/bench until a better solution is found.
>> - Reworked permission flag checks and event generation
>>
>> testing:
>> - in dt and ACPI modes
>> - virtio-net-pci and vhost-net devices using dma ops with various
>>   guest page sizes [2]
>> - assigned VFs using dma ops [3]:
>>   - AMD Overdrive and igbvf passthrough (using gsi direct mapping)
>>   - Cavium ThunderX and ixgbevf passthrough (using KVM MSI routing)
>> - DPDK testpmd on guest running with VFIO user space drivers (2 igbvf) [3]
>>   with guest and host page size equal (4kB)
>>
>> Known limitations:
>> - no VMSAv8-32 suport
>> - no nested stage support (S1 + S2)
>> - no support for HYP mappings
>> - register fine emulation, commands, interrupts and errors were
>>   not accurately tested. Handling is sufficient to run use cases
>>   described above though.
>> - interrupts and event generation not observed yet.
>>
> 
> By design, shouldnt this work on hardware with smmuv2 implementations as well. 
> ie. Guest with smmuv3 emulation + Host with smmuv2 hardware.

Yes indeed. I am mostly testing with a host featuring smmuv2 at the moment.

Thanks

Eric
> 
> Or Is there any known limitations for this ?
> 
>> Best Regards
>>
>> Eric
>>
>> This series can be found at:
>> v7: https://github.com/eauger/qemu/tree/v2.10.0-SMMU-v7
>> Previous version at:
>> v6: https://github.com/eauger/qemu/tree/v2.10.0-rc2-SMMU-v6
>>
>> References:
>> [1] [RFC v2 0/4] arm-smmu-v3 tlbi-on-map option
>>     https://lkml.org/lkml/2017/8/11/426
>>
>> [2] qemu cmd line excerpt:
>> -device smmuv3 \
>> -netdev tap,id=tap0,script=no,downscript=no,ifname=tap0,vhost=off \
>> -device virtio-net-pci,netdev=tap0,mac=6a:f5:10:b1:3d:d2,iommu_platform,disable-modern=off,disable-legacy=on \
>> [3] use -device smmuv3,caching-mode
>>
>>
>> History:
>> v6 -> v7:
>> - see above
>>
>> v5 -> v6:
>> - Rebase on 2.10 and IOMMUMemoryRegion
>> - add ACPI TLBI_ON_MAP support (VFIO integration also works in
>>   ACPI mode)
>> - fix block replay
>> - handle implementation defined SMMU_CMD_TLBI_NH_VA_AM cmd
>>   (goes along with TLBI_ON_MAP FW quirk)
>> - replay systematically unmap the whole range first
>> - smmuv3_map_hook does not unmap anymore and the unmap is done
>>   before the replay
>> - add and use smmuv3_context_device_invalidate instead of
>>   blindly replaying everything
>>
>> v4 -> v5:
>> - initial_level now part of SMMUTransCfg
>> - smmu_page_walk_64 takes into account the max input size
>> - implement sys->iommu_ops.replay and sys->iommu_ops.notify_flag_changed
>> - smmuv3_translate: bug fix: don't walk on bypass
>> - smmu_update_qreg: fix PROD index update
>> - I did not yet address Peter's comments as the code is not mature enough
>>   to be split into sub patches.
>>
>> v3 -> v4 [Eric]:
>> - page table walk rewritten to allow scan of the page table within a
>>   range of IOVA. This prepares for VFIO integration and replay.
>> - configuration parsing partially reworked.
>> - do not advertise unsupported/untested features: S2, S1 + S2, HYP,
>>   PRI, ATS, ..
>> - added ACPI table generation
>> - migrated to dynamic traces
>> - mingw compilation fix
>>
>> v2 -> v3 [Eric]:
>> - rebased on 2.9
>> - mostly code and patch reorganization to ease the review process
>> - optional patches removed. They may be handled separately. I am currently
>>   working on ACPI enablement.
>> - optional instantiation of the smmu in mach-virt
>> - removed [2/9] (fdt functions) since not mandated
>> - start splitting main patch into base and derived object
>> - no new function feature added
>>
>> v1 -> v2 [Prem]:
>> - Adopted review comments from Eric Auger
>>         - Make SMMU_DPRINTF to internally call qemu_log
>>             (since translation requests are too many, we need control
>>              on the type of log we want)
>>         - SMMUTransCfg modified to suite simplicity
>>         - Change RegInfo to uint64 register array
>>         - Code cleanup
>>         - Test cleanups
>> - Reshuffled patches
>>
>> v0 -> v1 [Prem]:
>> - As per SMMUv3 spec 16.0 (only is_ste_consistant() is noticeable)
>> - Reworked register access/update logic
>> - Factored out translation code for
>>         - single point bug fix
>>         - sharing/removal in future
>> - (optional) Unit tests added, with PCI test device
>>         - S1 with 4k/64k, S1+S2 with 4k/64k
>>         - (S1 or S2) only can be verified by Linux 4.7 driver
>>         - (optional) Priliminary ACPI support
>>
>> v0 [Prem]:
>> - Implements SMMUv3 spec 11.0
>> - Supported for PCIe devices,
>> - Command Queue and Event Queue supported
>> - LPAE only, S1 is supported and Tested, S2 not tested
>> - BE mode Translation not supported
>> - IRQ support (legacy, no MSI)
>>
>> Eric Auger (18):
>>   hw/arm/smmu-common: smmu base device and datatypes
>>   hw/arm/smmu-common: IOMMU memory region and address space setup
>>   hw/arm/smmu-common: smmu_read/write_sysmem
>>   hw/arm/smmu-common: VMSAv8-64 page table walk
>>   hw/arm/smmuv3: Wired IRQ and GERROR helpers
>>   hw/arm/smmuv3: Queue helpers
>>   hw/arm/smmuv3: Implement MMIO write operations
>>   hw/arm/smmuv3: Event queue recording helper
>>   hw/arm/smmuv3: Implement translate callback
>>   target/arm/kvm: Translate the MSI doorbell in kvm_arch_fixup_msi_route
>>   hw/arm/smmuv3: Implement data structure and TLB invalidation
>>     notifications
>>   hw/arm/smmuv3: Implement IOMMU memory region replay callback
>>   hw/arm/virt: Store the PCI host controller dt phandle
>>   hw/arm/sysbus-fdt: Pass the VirtMachineState to the node creation
>>     functions
>>   hw/arm/sysbus-fdt: Pass the platform bus base address in
>>     PlatformBusFDTData
>>   hw/arm/sysbus-fdt: Allow smmuv3 dynamic instantiation
>>   hw/arm/smmuv3: [not for upstream] add SMMU_CMD_TLBI_NH_VA_AM handling
>>   hw/arm/smmuv3: [not for upstream] Add caching-mode option
>>
>> Prem Mallappa (2):
>>   hw/arm/smmuv3: Skeleton
>>   hw/arm/virt-acpi-build: Add smmuv3 node in IORT table
>>
>>  default-configs/aarch64-softmmu.mak |    1 +
>>  hw/arm/Makefile.objs                |    1 +
>>  hw/arm/smmu-common.c                |  527 ++++++++++++++++
>>  hw/arm/smmu-internal.h              |  105 ++++
>>  hw/arm/smmuv3-internal.h            |  584 +++++++++++++++++
>>  hw/arm/smmuv3.c                     | 1181 +++++++++++++++++++++++++++++++++++
>>  hw/arm/sysbus-fdt.c                 |  129 +++-
>>  hw/arm/trace-events                 |   48 ++
>>  hw/arm/virt-acpi-build.c            |   63 +-
>>  hw/arm/virt.c                       |    6 +-
>>  include/hw/acpi/acpi-defs.h         |   15 +
>>  include/hw/arm/smmu-common.h        |  123 ++++
>>  include/hw/arm/smmuv3.h             |   80 +++
>>  include/hw/arm/sysbus-fdt.h         |    2 +
>>  include/hw/arm/virt.h               |   15 +
>>  target/arm/kvm.c                    |   27 +
>>  target/arm/trace-events             |    3 +
>>  17 files changed, 2886 insertions(+), 24 deletions(-)
>>  create mode 100644 hw/arm/smmu-common.c
>>  create mode 100644 hw/arm/smmu-internal.h
>>  create mode 100644 hw/arm/smmuv3-internal.h
>>  create mode 100644 hw/arm/smmuv3.c
>>  create mode 100644 include/hw/arm/smmu-common.h
>>  create mode 100644 include/hw/arm/smmuv3.h
>>
>> -- 
>> 2.5.5
>>
>>
>