On Thu, Sep 15, 2022 at 3:56 AM Jan Beulich <jbeul...@suse.com> wrote: > > 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.
This was indeed observed with a xen.efi booted directly from UEFI. Beside the limited boot log I get through xhci I don't have more insight but happy to send that (and anything else you think would be useful). Tamas
