Re: [Qemu-devel] [RFC v3 0/5] SMMUv3 Emmulation Support

[Radha Mohan <mohun106@gmail.com>]

Hi Eric

On Thu, Mar 30, 2017 at 12:42 PM, Eric Auger <eric.auger@redhat.com> wrote:
> This series introduces the emulation code for ARM SMMUv3.
> This is the continuation of Prem's work [1].
>
> At the moment only AArch64 translation format is supported, ie.
> no support for AArch32 (LPAE) translation.
>
> stage1, stage2 and stage1 + Stage2 are supposed to work but I only
> tested stage 1 at the moment.
>
> I will do the comprehensive inventory of unsupported features in
> next version.
>
> As reported by Edgar, TBUs are not modeled properly and this will be
> addressed in next respin.
>
> Don't spend too much time reviewing this version. This is just a rebase
> plus some cleanups done while getting familiar with the code structure.
> I will try to move as much in the base class and reuse Xilinx code when
> sensible.
>
> Best Regards
>
> Eric
>
> Testing:
> - booted a 4.11-rc4 guest in dt mode with virtio-pci device
>
> References:
> [1] Prem's last iteration:
> - https://lists.gnu.org/archive/html/qemu-devel/2016-08/msg03531.html
>
> History:
> 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 (2):
>   hw/arm/smmu-common: smmu base class
>   hw/arm/virt: Add 2.10 machine type
>
> Prem Mallappa (3):
>   log: Add new IOMMU type
>   hw/arm/smmuv3: smmuv3 emulation model
>   hw/arm/virt: Add SMMUv3 to the virt board
>
>  default-configs/aarch64-softmmu.mak |    1 +
>  hw/arm/Makefile.objs                |    1 +
>  hw/arm/smmu-common.c                |  193 ++++++
>  hw/arm/smmuv3-internal.h            |  544 +++++++++++++++++
>  hw/arm/smmuv3.c                     | 1131 +++++++++++++++++++++++++++++++++++
>  hw/arm/virt.c                       |  109 +++-
>  include/hw/arm/smmu-common.h        |  151 +++++
>  include/hw/arm/smmuv3.h             |   88 +++
>  include/hw/arm/virt.h               |    5 +
>  include/hw/compat.h                 |    3 +
>  include/qemu/log.h                  |    1 +
>  util/log.c                          |    2 +
>  12 files changed, 2227 insertions(+), 2 deletions(-)
>  create mode 100644 hw/arm/smmu-common.c
>  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

Did a quick test with 4.10.1 guest and 4.11-rc3 host.

~# qemu-system-aarch64 -cpu host -enable-kvm -M virt,gic_version=3
-nographic -smp 1 -m 2048 -drive
if=none,id=hd0,file=/root/zesty-server-cloudimg-arm64.img,id=0 -device
virtio-blk-device,drive=hd0 -pflash /root/flash0.img -pflash
/root/flash1.img -device vfio-pci,host=0000:13:00.1 -M virt,smmu=on
qemu-system-aarch64: -device vfio-pci,host=0000:13:00.1: iommu map to
non memory area 0
qemu-system-aarch64: -device vfio-pci,host=0000:13:00.1: iommu map to
non memory area 1000
qemu-system-aarch64: -device vfio-pci,host=0000:13:00.1: iommu map to
non memory area 2000
qemu-system-aarch64: -device vfio-pci,host=0000:13:00.1: iommu map to
non memory area 3000
qemu-system-aarch64: -device vfio-pci,host=0000:13:00.1: iommu map to
non memory area 4000
qemu-system-aarch64: -device vfio-pci,host=0000:13:00.1: iommu map to
non memory area 5000
qemu-system-aarch64: -device vfio-pci,host=0000:13:00.1: iommu map to
non memory area 6000
qemu-system-aarch64: -device vfio-pci,host=0000:13:00.1: iommu map to
non memory area 7000
qemu-system-aarch64: -device vfio-pci,host=0000:13:00.1: iommu map to
non memory area 8000
qemu-system-aarch64: -device vfio-pci,host=0000:13:00.1: iommu map to
non memory area 9000
..
..
qemu-system-aarch64: -device vfio-pci,host=0000:13:00.1: iommu map to
non memory area fff000
qemu-system-aarch64: -device vfio-pci,host=0000:13:00.1: VFIO_MAP_DMA: -22
qemu-system-aarch64: -device vfio-pci,host=0000:13:00.1:
vfio_dma_map(0x1d52e600, 0x40000000, 0x0, 0xffff17e00000) = -22
(Invalid argument)
qemu-system-aarch64: -device vfio-pci,host=0000:13:00.1: VFIO_MAP_DMA: -22
qemu-system-aarch64: -device vfio-pci,host=0000:13:00.1:
vfio_dma_map(0x1d52e600, 0x40001000, 0x0, 0xffff17e01000) = -22
(Invalid argument)
qemu-system-aarch64: -device vfio-pci,host=0000:13:00.1: VFIO_MAP_DMA: -22
qemu-system-aarch64: -device vfio-pci,host=0000:13:00.1:
vfio_dma_map(0x1d52e600, 0x40002000, 0x0, 0xffff17e02000) = -22
(Invalid argument)
..
..

And this goes on until I kill the qemu process.

>
>