Re: [RFC RESEND PATCH 0/4] hw/arm/virt-acpi-build: Introduce iommu option for pci root bus

[Wang Xingang]

Hi Eric,

On 2021/3/10 18:18, Auger Eric wrote:
> Hi Xingang,
>
> On 3/10/21 3:13 AM, Wang Xingang wrote:
> > Hi Eric,
> >
> > On 2021/3/9 22:36, Auger Eric wrote:
> > > Hi,
> > > On 2/27/21 9:33 AM, Wang Xingang wrote:
> > > > From: Xingang Wang <wangxingang5@huawei.com>
> > > >
> > > > These patches add support for configure iommu on/off for pci root bus,
> > > > including primary bus and pxb root bus. At present, All root bus will go
> > > > through iommu when iommu is configured, which is not flexible.
> > > >
> > > > So this add option to enable/disable iommu for primary bus and pxb
> > > > root bus.
> > > > When iommu is enabled for the root bus, devices attached to it will go
> > > > through iommu. When iommu is disabled for the root bus, devices will not
> > > > go through iommu accordingly.
> > >
> > > Please could you give an example of the qemu command line for which the
> > > new option is useful for you. This would help me to understand your
> > > pcie/pci topology and also make sure I test it with the smmu.
> > >
> > > Thank you in advance
> > >
> > > Best Regards
> > >
> > > Eric
> > > > Xingang Wang (4):
> > > >     pci: Add PCI_BUS_IOMMU property
> > > >     hw/pci: Add iommu option for pci root bus
> > > >     hw/pci: Add pci_root_bus_max_bus
> > > >     hw/arm/virt-acpi-build: Add explicit idmap info in IORT table
> > > >
> > > >    hw/arm/virt-acpi-build.c            | 92 +++++++++++++++++++++--------
> > > >    hw/arm/virt.c                       | 29 +++++++++
> > > >    hw/pci-bridge/pci_expander_bridge.c |  6 ++
> > > >    hw/pci/pci.c                        | 35 ++++++++++-
> > > >    include/hw/arm/virt.h               |  1 +
> > > >    include/hw/pci/pci.h                |  1 +
> > > >    include/hw/pci/pci_bus.h            | 13 ++++
> > > >    7 files changed, 153 insertions(+), 24 deletions(-)
> > >
> > > .
> >
> > Thanks for your advice.
> >
> > I test this with the following script, in which i add two options.
> >
> > The option `primary_bus_iommu=false(or true)` for `-machine
> > virt,iommu=smmuv3`, this helps to enable/disable whether primary bus go
> > through iommu.
> >
> > The other option `iommu=false` or `iommu=true` for `-device pxb-pcie`
> > helps to enable/disable whether pxb root bus go through iommu.
> >
> > > #!/bin/sh
> > >
> > > /path/to/qemu/build/aarch64-softmmu/qemu-system-aarch64 \
> > > -enable-kvm \
> > > -cpu host \
> > > -kernel /path/to/linux/arch/arm64/boot/Image \
> > > -m 16G \
> > > -smp 8,sockets=8,cores=1,threads=1 \
> > > -machine
> > > virt,kernel_irqchip=on,gic-version=3,iommu=smmuv3,primary_bus_iommu=false
> > > \
> > > -drive
> > > file=./QEMU_EFI-pflash.raw,if=pflash,format=raw,unit=0,readonly=on \
> > > -device
> > > pxb-pcie,bus_nr=0x10,id=pci.10,bus=pcie.0,addr=0x3.0x1,iommu=false \
> > > -device
> > > pxb-pcie,bus_nr=0x20,id=pci.20,bus=pcie.0,addr=0x3.0x2,iommu=true \
> > > -device
> > > pxb-pcie,bus_nr=0x23,id=pci.30,bus=pcie.0,addr=0x3.0x3,iommu=true \
> > > -device
> > > pxb-pcie,bus_nr=0x40,id=pci.40,bus=pcie.0,addr=0x3.0x4,iommu=false \
> > > -device pcie-pci-bridge,id=pci.11,bus=pci.10,addr=0x1 \
> > > -device pcie-pci-bridge,id=pci.21,bus=pci.20,addr=0x1 \
> > > -device
> > > pcie-root-port,port=0x20,chassis=10,id=pci.2,bus=pcie.0,addr=0x2 \
> > > -device
> > > pcie-root-port,port=0x20,chassis=11,id=pci.12,bus=pci.10,addr=0x2 \
> > > -device
> > > pcie-root-port,port=0x20,chassis=19,id=pci.19,bus=pci.11,addr=0x3 \
> > > -device
> > > pcie-root-port,port=0x20,chassis=12,id=pci.22,bus=pci.20,addr=0x2 \
> > > -device
> > > pcie-root-port,port=0x20,chassis=13,id=pci.42,bus=pci.40,addr=0x2 \
> > > -device virtio-scsi-pci,id=scsi0,bus=pci.12,addr=0x1 \
> > > -device vfio-pci,host=b5:00.2,bus=pci.42,addr=0x0,id=acc2 \
> > > -net none \
> > > -initrd /path/to/rootfs.cpio.gz \
> > > -nographic \
> > > -append "rdinit=init console=ttyAMA0 earlycon=pl011,0x9000000 nokaslr" \
> >
> > I test the command line with an accelerator. The IORT table will have
> > some changes, so only the root bus with iommu=true will go through smmuv3.
>
> Thank you for sharing your command line.
>
> On my end without using ",iommu=smmuv3" and the new options, my guest
> crashes.
>
>      0.833665] ACPI: PCI Root Bridge [PC0A] (domain 0000 [bus 0a-0b])
> [    0.837630] acpi PNP0A08:00: _OSC: OS supports [ExtendedConfig ASPM
> ClockPM Segments MSI HPX-Type3]
> [    0.843377] acpi PNP0A08:00: _OSC: platform does not support [LTR]
> [    0.846796] acpi PNP0A08:00: _OSC: OS now controls [PCIeHotplug PME
> AER PCIeCapability]
> [    0.851082] acpi PNP0A08:00: ECAM area [mem
> 0x4010a00000-0x4010bfffff] reserved by PNP0C02:00
> [    0.854742] acpi PNP0A08:00: ECAM at [mem 0x4010a00000-0x4010bfffff]
> for [bus 0a-0b]
> [    0.859569] ------------[ cut here ]------------
> [    0.862470] kernel BUG at mm/ioremap.c:76!
> [    0.865066] Internal error: Oops - BUG: 0 [#1] SMP
> [    0.868130] Modules linked in:
> [    0.870060] CPU: 6 PID: 1 Comm: swapper/0 Not tainted
> 5.11.0-rc6-guest-upstream+ #26
> [    0.874920] Hardware name: QEMU KVM Virtual Machine, BIOS 0.0.0
> 02/06/2015
> [    0.879283] pstate: 80400005 (Nzcv daif +PAN -UAO -TCO BTYPE=--)
> [    0.883055] pc : ioremap_page_range+0x33c/0x3e0
> [    0.885942] lr : ioremap_page_range+0x30/0x3e0
> [    0.888737] sp : ffff80001272f800
> [    0.890824] x29: ffff80001272f800 x28: ffffffbffe801000
> [    0.894168] x27: ffffffc020040000 x26: ffff8000111b01f8
> [    0.897543] x25: 0400000000000001 x24: ffffffbffe800000
> [    0.900882] x23: 000000003eff3000 x22: ffffffbffe801000
> [    0.904221] x21: ffffffbffe801000 x20: ffff0003f2270020
> [    0.907612] x19: 0000000000000001 x18: 0000000000000030
> [    0.910952] x17: 0000000000000000 x16: 0000000000000001
> [    0.914283] x15: ffffffffffffffff x14: ffff8000116d49c8
> [    0.917679] x13: 000000003eff3000 x12: 0000000000000041
> [    0.921018] x11: ffff800011f2f000 x10: 000000000000002e
> [    0.924359] x9 : ffff800010c372c4 x8 : ffffffbffe800000
> [    0.927744] x7 : ffff0003f224eff8 x6 : 0000000000000001
> [    0.931092] x5 : ffffffbffe800fff x4 : ffff8000116de650
> [    0.934430] x3 : 0068000000000f17 x2 : 0140000000000000
> [    0.937813] x1 : 00000040407f0000 x0 : ffff0003ffdcccc0
> [    0.941165] Call trace:
> [    0.942713]  ioremap_page_range+0x33c/0x3e0
> [    0.945374]  pci_remap_iospace+0x7c/0x90
> [    0.947881]  acpi_pci_probe_root_resources+0x180/0x238
> [    0.951122]  pci_acpi_root_prepare_resources+0x28/0xc8
> [    0.954357]  acpi_pci_root_create+0x9c/0x2f8
> [    0.956990]  pci_acpi_scan_root+0x150/0x240
> [    0.959639]  acpi_pci_root_add+0x34c/0x4e0
> [    0.962220]  acpi_bus_attach+0x15c/0x2c0
> [    0.964692]  acpi_bus_attach+0x9c/0x2c0
> [    0.967135]  acpi_bus_attach+0x9c/0x2c0
> [    0.969582]  acpi_bus_scan+0x64/0x118
> [    0.971888]  acpi_scan_init+0x10c/0x244
> [    0.974302]  acpi_init+0x2bc/0x328
> [    0.976463]  do_one_initcall+0x54/0x268
> [    0.978913]  kernel_init_freeable+0x22c/0x2c4
> [    0.981658]  kernel_init+0x1c/0x128
> [    0.983864]  ret_from_fork+0x10/0x34
> [    0.986139] Code: a9446bf9 a8cb7bfd d50323bf d65f03c0 (d4210000)
> [    0.990037] ---[ end trace fc68f309d1db57e3 ]---
> [    0.992939] Kernel panic - not syncing: Oops - BUG: Fatal exception
> [    0.996893] SMP: stopping secondary CPUs
> [    0.999487] ---[ end Kernel panic - not syncing: Oops - BUG: Fatal
> exception ]---
>
> Do you have any idea. I am using
>
> http://snapshots.linaro.org/components/kernel/leg-virt-tianocore-edk2-upstream/4198/QEMU-AARCH64/RELEASE_GCC5/
>
> Thanks
>
> Eric
>
>
>
>
> > Thanks,
> > Xingang
> > .
>
> .

I retest with the QEMU_EFI.fd and QEMU.img.gz you provided, and i don't 
have this issue. Could you please provide more information about how you 
test, and is everything ok with the iommu=smmuv3 on ?

From the debug info, it might be the problem of building the ACPI IORT 
table. And could you please retest without the last patch, and see if 
everything is ok.

Thanks.

Xingang

.