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Re: Console output stops on dbgp=xhci
- To: Tamas K Lengyel <tamas@xxxxxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Thu, 15 Sep 2022 09:55:57 +0200
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- Cc: Xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxxx>, Marek Marczykowski-Górecki <marmarek@xxxxxxxxxxxxxxxxxxxxxx>
- Delivery-date: Thu, 15 Sep 2022 07:56:15 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 15.09.2022 02:41, Tamas K Lengyel wrote:
>>> Do you have any idea what might be going on and preventing the output
>>> from showing over USB3 afterwards? The /dev/ttyUSB0 device is still
>>> present on the receiving side, just nothing is being received over it.
>>
>> There are few more patches in the series that are de facto required.
>> Especially those about IOMMU, otherwise it can only possibly work with
>> iommu=0 (which I'm not sure if even is enough).
>
> Unfortunately with iommu=0 Xen doesn't boot at all for me. I see this
> on the console:
>
> (XEN) Panic on CPU 0:
> (XEN) FATAL PAGE FAULT
> (XEN) [error_code=0011]
> (XEN) Faulting linear address: 00000000328b3a54
Perhaps in another thread, could you post details about this? I guess
we want to address this independent of your XHCI issue. That's an
attempt to execute code outside of the Xen image - the only reason I
can think of for this would be an EFI boot services or runtime
services call, with (possibly but not necessarily) quirky EFI firmware.
Any other context this is appearing in would quite certainly require a
fix in Xen, and I don't see how "iommu=0" could affect the set of EFI
calls we make.
Jan
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