Re: aarch64 efi boot failures with qemu 6.0+

[Philippe Mathieu-Daudé]

On 7/26/21 12:56 AM, Guenter Roeck wrote:
> On 7/25/21 3:14 PM, Michael S. Tsirkin wrote:
>> On Sat, Jul 24, 2021 at 11:52:34AM -0700, Guenter Roeck wrote:
>>> Hi all,
>>>
>>> starting with qemu v6.0, some of my aarch64 efi boot tests no longer
>>> work. Analysis shows that PCI devices with IO ports do not instantiate
>>> in qemu v6.0 (or v6.1-rc0) when booting through efi. The problem affects
>>> (at least) ne2k_pci, tulip, dc390, and am53c974. The problem only
>>> affects
>>> aarch64, not x86/x86_64.
>>>
>>> I bisected the problem to commit 0cf8882fd0 ("acpi/gpex: Inform os to
>>> keep firmware resource map"). Since this commit, PCI device BAR
>>> allocation has changed. Taking tulip as example, the kernel reports
>>> the following PCI bar assignments when running qemu v5.2.
>>>
>>> [    3.921801] pci 0000:00:01.0: [1011:0019] type 00 class 0x020000
>>> [    3.922207] pci 0000:00:01.0: reg 0x10: [io  0x0000-0x007f]
>>> [    3.922505] pci 0000:00:01.0: reg 0x14: [mem 0x10000000-0x1000007f]
>>> [    3.927111] pci 0000:00:01.0: BAR 0: assigned [io  0x1000-0x107f]
>>> [    3.927455] pci 0000:00:01.0: BAR 1: assigned [mem
>>> 0x10000000-0x1000007f]
>>>
>>> With qemu v6.0, the assignment is reported as follows.
>>>
>>> [    3.922887] pci 0000:00:01.0: [1011:0019] type 00 class 0x020000
>>> [    3.923278] pci 0000:00:01.0: reg 0x10: [io  0x0000-0x007f]
>>> [    3.923451] pci 0000:00:01.0: reg 0x14: [mem 0x10000000-0x1000007f]
>>>
>>> and the controller does not instantiate. The problem disapears after
>>> reverting commit 0cf8882fd0.
>>>
>>> Attached is a summary of test runs with various devices and qemu v5.2
>>> as well as qemu v6.0, and the command line I use for efi boots.
>>>
>>> Did commit 0cf8882fd0 introduce a bug, do I now need need some different
>>> command line to instantiate PCI devices with io ports, or are such
>>> devices
>>> simply no longer supported if the system is booted with efi support ?
>>>
>>> Thanks,
>>> Guenter
>>
>>
>> So that commit basically just says don't ignore what efi did.
>>
>> The issue's thus likely efi.
>>
> 
> I don't see the problem with efi boots on x86 and x86_64.
> Any idea why that might be the case ?
> 
> Thanks,
> Guenter
> 
>> Cc the maintainer. Philippe can you comment pls?

I'll have a look. Cc'ing Ard for EDK2/Aarch64.

>>
>>> ---
>>> Command line (tulip network interface):
>>>
>>> CMDLINE="root=/dev/vda console=ttyAMA0"
>>> ROOTFS="rootfs.ext2"
>>>
>>> qemu-system-aarch64 -M virt -kernel arch/arm64/boot/Image -no-reboot \
>>>          -m 512 -cpu cortex-a57 -no-reboot \
>>>          -device tulip,netdev=net0 -netdev user,id=net0 \
>>>          -bios QEMU_EFI-aarch64.fd \
>>>          -snapshot \
>>>          -device virtio-blk-device,drive=d0 \
>>>          -drive file=${ROOTFS},if=none,id=d0,format=raw \
>>>          -nographic -serial stdio -monitor none \
>>>          --append "${CMDLINE}"
>>>
>>> ---
>>> Boot tests with various devices known to work in qemu v5.2.
>>>
>>>         v5.2    v6.0    v6.0
>>>         efi    non-efi    efi
>>> e1000        pass    pass    pass
>>> e1000-82544gc    pass    pass    pass
>>> e1000-82545em    pass    pass    pass
>>> e1000e        pass    pass    pass
>>> i82550        pass    pass    pass
>>> i82557a        pass    pass    pass
>>> i82557b        pass    pass    pass
>>> i82557c        pass    pass    pass
>>> i82558a        pass    pass    pass
>>> i82559b        pass    pass    pass
>>> i82559c        pass    pass    pass
>>> i82559er    pass    pass    pass
>>> i82562        pass    pass    pass
>>> i82801        pass    pass    pass
>>> ne2k_pci    pass    pass    fail    <--
>>> pcnet        pass    pass    pass
>>> rtl8139        pass    pass    pass
>>> tulip        pass    pass    fail    <--
>>> usb-net        pass    pass    pass
>>> virtio-net-device
>>>         pass    pass    pass
>>> virtio-net-pci    pass    pass    pass
>>> virtio-net-pci-non-transitional
>>>         pass    pass    pass
>>>
>>> usb-xhci    pass    pass    pass
>>> usb-ehci    pass    pass    pass
>>> usb-ohci    pass    pass    pass
>>> usb-uas-xhci    pass    pass    pass
>>> virtio        pass    pass    pass
>>> virtio-blk-pci    pass    pass    pass
>>> virtio-blk-device
>>>         pass    pass    pass
>>> nvme        pass    pass    pass
>>> sdhci        pass    pass    pass
>>> dc390        pass    pass    fail    <--
>>> am53c974    pass    pass    fail    <--
>>> lsi53c895ai    pass    pass    pass
>>> mptsas1068    pass    pass    pass
>>> lsi53c810    pass    pass    pass
>>> megasas        pass    pass    pass
>>> megasas-gen2    pass    pass    pass
>>> virtio-scsi-device
>>>         pass    pass    pass
>>> virtio-scsi-pci    pass    pass    pass
>>
>