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RE: [RFC v6 00/24] vSMMUv3/pSMMUv3 2 stage VFIO integration
From: |
Shameerali Kolothum Thodi |
Subject: |
RE: [RFC v6 00/24] vSMMUv3/pSMMUv3 2 stage VFIO integration |
Date: |
Wed, 25 Mar 2020 11:35:17 +0000 |
Hi Eric,
> -----Original Message-----
> From: Eric Auger [mailto:address@hidden]
> Sent: 20 March 2020 16:58
> To: address@hidden; address@hidden;
> address@hidden; address@hidden; address@hidden;
> address@hidden; address@hidden;
> address@hidden; address@hidden
> Cc: address@hidden; address@hidden; address@hidden;
> address@hidden; Shameerali Kolothum Thodi
> <address@hidden>; address@hidden;
> address@hidden; address@hidden; address@hidden
> Subject: [RFC v6 00/24] vSMMUv3/pSMMUv3 2 stage VFIO integration
>
> Up to now vSMMUv3 has not been integrated with VFIO. VFIO
> integration requires to program the physical IOMMU consistently
> with the guest mappings. However, as opposed to VTD, SMMUv3 has
> no "Caching Mode" which allows easy trapping of guest mappings.
> This means the vSMMUV3 cannot use the same VFIO integration as VTD.
>
> However SMMUv3 has 2 translation stages. This was devised with
> virtualization use case in mind where stage 1 is "owned" by the
> guest whereas the host uses stage 2 for VM isolation.
>
> This series sets up this nested translation stage. It only works
> if there is one physical SMMUv3 used along with QEMU vSMMUv3 (in
> other words, it does not work if there is a physical SMMUv2).
I was testing this series on one of our hardware board with SMMUv3. I did
observe an issue while trying to bring up Guest with and without the vsmmuV3.
Steps are like below,
1. start a guest with "iommu=smmuv3" and a n/w vf device.
2.Exit the VM.
3. start the guest again without "iommu=smmuv3"
This time qemu crashes with,
[ 0.447830] hns3 0000:00:01.0: enabling device (0000 -> 0002)
/home/shameer/qemu-eric/qemu/hw/vfio/pci.c:2851:vfio_dma_fault_notifier_handler:
Object 0xaaaaeeb47c00 is not an instance of type
qemu:iommu-memory-region
./qemu_run-vsmmu-hns: line 9: 13609 Aborted (core
dumped) ./qemu-system-aarch64-vsmmuv3v10 -machine
virt,kernel_irqchip=on,gic-version=3 -cpu host -smp cpus=1 -kernel
Image-ericv10-uacce -initrd rootfs-iperf.cpio -bios
QEMU_EFI_Dec2018.fd -device vfio-pci,host=0000:7d:02.1 -net none -m
4096 -nographic -D -d -enable-kvm -append "console=ttyAMA0
root=/dev/vda -m 4096 rw earlycon=pl011,0x9000000"
And you can see that host kernel receives smmuv3 C_BAD_STE event,
[10499.379288] vfio-pci 0000:7d:02.1: enabling device (0000 -> 0002)
[10501.943881] arm-smmu-v3 arm-smmu-v3.2.auto: event 0x04 received:
[10501.943884] arm-smmu-v3 arm-smmu-v3.2.auto: 0x00007d1100000004
[10501.943886] arm-smmu-v3 arm-smmu-v3.2.auto: 0x0000100800000080
[10501.943887] arm-smmu-v3 arm-smmu-v3.2.auto: 0x00000000fe040000
[10501.943889] arm-smmu-v3 arm-smmu-v3.2.auto: 0x000000007e04c440
So I suspect we didn't clear nested stage configuration and that affects the
translation in the second run. I tried to issue(force) a
vfio_detach_pasid_table() but
that didn't solve the problem.
May be I am missing something. Could you please take a look and let me know.
Thanks,
Shameer
> - We force the host to use stage 2 instead of stage 1, when we
> detect a vSMMUV3 is behind a VFIO device. For a VFIO device
> without any virtual IOMMU, we still use stage 1 as many existing
> SMMUs expect this behavior.
> - We use PCIPASIDOps to propage guest stage1 config changes on
> STE (Stream Table Entry) changes.
> - We implement a specific UNMAP notifier that conveys guest
> IOTLB invalidations to the host
> - We register MSI IOVA/GPA bindings to the host so that this latter
> can build a nested stage translation
> - As the legacy MAP notifier is not called anymore, we must make
> sure stage 2 mappings are set. This is achieved through another
> prereg memory listener.
> - Physical SMMU stage 1 related faults are reported to the guest
> via en eventfd mechanism and exposed trhough a dedicated VFIO-PCI
> region. Then they are reinjected into the guest.
>
> Best Regards
>
> Eric
>
> This series can be found at:
> https://github.com/eauger/qemu/tree/v4.2.0-2stage-rfcv6
>
> Kernel Dependencies:
> [1] [PATCH v10 00/11] SMMUv3 Nested Stage Setup (VFIO part)
> [2] [PATCH v10 00/13] SMMUv3 Nested Stage Setup (IOMMU part)
> branch at:
> https://github.com/eauger/linux/tree/will-arm-smmu-updates-2stage-v10
>
> History:
>
> v5 -> v6:
> - just rebase work
>
> v4 -> v5:
> - Use PCIPASIDOps for config update notifications
> - removal of notification for MSI binding which is not needed
> anymore
> - Use a single fault region
> - use the specific interrupt index
>
> v3 -> v4:
> - adapt to changes in uapi (asid cache invalidation)
> - check VFIO_PCI_DMA_FAULT_IRQ_INDEX is supported at kernel level
> before attempting to set signaling for it.
> - sync on 5.2-rc1 kernel headers + Drew's patch that imports sve_context.h
> - fix MSI binding for MSI (not MSIX)
> - fix mingw compilation
>
> v2 -> v3:
> - rework fault handling
> - MSI binding registration done in vfio-pci. MSI binding tear down called
> on container cleanup path
> - leaf parameter propagated
>
> v1 -> v2:
> - Fixed dual assignment (asid now correctly propagated on TLB invalidations)
> - Integrated fault reporting
>
>
> Eric Auger (23):
> update-linux-headers: Import iommu.h
> header update against 5.6.0-rc3 and IOMMU/VFIO nested stage APIs
> memory: Add IOMMU_ATTR_VFIO_NESTED IOMMU memory region
> attribute
> memory: Add IOMMU_ATTR_MSI_TRANSLATE IOMMU memory region
> attribute
> memory: Introduce IOMMU Memory Region inject_faults API
> memory: Add arch_id and leaf fields in IOTLBEntry
> iommu: Introduce generic header
> vfio: Force nested if iommu requires it
> vfio: Introduce hostwin_from_range helper
> vfio: Introduce helpers to DMA map/unmap a RAM section
> vfio: Set up nested stage mappings
> vfio: Pass stage 1 MSI bindings to the host
> vfio: Helper to get IRQ info including capabilities
> vfio/pci: Register handler for iommu fault
> vfio/pci: Set up the DMA FAULT region
> vfio/pci: Implement the DMA fault handler
> hw/arm/smmuv3: Advertise MSI_TRANSLATE attribute
> hw/arm/smmuv3: Store the PASID table GPA in the translation config
> hw/arm/smmuv3: Fill the IOTLBEntry arch_id on NH_VA invalidation
> hw/arm/smmuv3: Fill the IOTLBEntry leaf field on NH_VA invalidation
> hw/arm/smmuv3: Pass stage 1 configurations to the host
> hw/arm/smmuv3: Implement fault injection
> hw/arm/smmuv3: Allow MAP notifiers
>
> Liu Yi L (1):
> pci: introduce PCIPASIDOps to PCIDevice
>
> hw/arm/smmuv3.c | 189 ++++++++++--
> hw/arm/trace-events | 3 +-
> hw/pci/pci.c | 34 +++
> hw/vfio/common.c | 506
> +++++++++++++++++++++++++-------
> hw/vfio/pci.c | 267 ++++++++++++++++-
> hw/vfio/pci.h | 9 +
> hw/vfio/trace-events | 9 +-
> include/exec/memory.h | 49 +++-
> include/hw/arm/smmu-common.h | 1 +
> include/hw/iommu/iommu.h | 28 ++
> include/hw/pci/pci.h | 11 +
> include/hw/vfio/vfio-common.h | 16 +
> linux-headers/COPYING | 2 +
> linux-headers/asm-x86/kvm.h | 1 +
> linux-headers/linux/iommu.h | 375 +++++++++++++++++++++++
> linux-headers/linux/vfio.h | 109 ++++++-
> memory.c | 10 +
> scripts/update-linux-headers.sh | 2 +-
> 18 files changed, 1478 insertions(+), 143 deletions(-)
> create mode 100644 include/hw/iommu/iommu.h
> create mode 100644 linux-headers/linux/iommu.h
>
> --
> 2.20.1
- [RFC v6 15/24] vfio/pci: Register handler for iommu fault, (continued)
- [RFC v6 15/24] vfio/pci: Register handler for iommu fault, Eric Auger, 2020/03/20
- [RFC v6 17/24] vfio/pci: Implement the DMA fault handler, Eric Auger, 2020/03/20
- [RFC v6 16/24] vfio/pci: Set up the DMA FAULT region, Eric Auger, 2020/03/20
- [RFC v6 18/24] hw/arm/smmuv3: Advertise MSI_TRANSLATE attribute, Eric Auger, 2020/03/20
- [RFC v6 19/24] hw/arm/smmuv3: Store the PASID table GPA in the translation config, Eric Auger, 2020/03/20
- [RFC v6 20/24] hw/arm/smmuv3: Fill the IOTLBEntry arch_id on NH_VA invalidation, Eric Auger, 2020/03/20
- [RFC v6 21/24] hw/arm/smmuv3: Fill the IOTLBEntry leaf field on NH_VA invalidation, Eric Auger, 2020/03/20
- [RFC v6 22/24] hw/arm/smmuv3: Pass stage 1 configurations to the host, Eric Auger, 2020/03/20
- [RFC v6 23/24] hw/arm/smmuv3: Implement fault injection, Eric Auger, 2020/03/20
- [RFC v6 24/24] hw/arm/smmuv3: Allow MAP notifiers, Eric Auger, 2020/03/20
- RE: [RFC v6 00/24] vSMMUv3/pSMMUv3 2 stage VFIO integration,
Shameerali Kolothum Thodi <=
- Re: [RFC v6 00/24] vSMMUv3/pSMMUv3 2 stage VFIO integration, Zhangfei Gao, 2020/03/31