Re: Xenbus issues on Qubes OS / win10

[Paul Durrant <xadimgnik@xxxxxxxxx>]

On 23/06/2023 16:37, Rafał Wojdyła wrote:
> Hello,
>
> I'm trying the latest PV drivers on Qubes OS (backend is Xen 4.14.5) 
> with Windows 10 pro and having some issues. Mainly, xenbus fails to 
> initialize properly. I've attached a debug output, the main issue seems 
> to be this:
> xenbus|StoreAcquire: ====>
> xenbus|GnttabAcquire: ====>
> xenbus|RangeSetPop: fail3
> xenbus|RangeSetPop: fail2
> xenbus|RangeSetPop: fail1 (c000009a)
> xenbus|FdoAllocateHole: fail1 (c000009a)
> xenbus|GnttabAcquire: fail2
> xenbus|GnttabAcquire: fail1 (c000009a)
> xenbus|StoreAcquire: fail1 (c000009a)
> xenbus|FdoD3ToD0: fail6
>
> ...which seems pretty suspicious. It's been some years since I looked at 
> the drivers' code so any ideas as to what may be causing this are 
> welcome :)
> I've built the driver myself from commit b03c9c0.
>
> Btw, is there a way to tell the drivers to leave the xen's serial 
> console alone? I'm using it for debugging because adding a second serial 
> device is currently problematic in Qubes.
Logging will go via QEMU's and Xen's debug ports. You should be able to 
turn off logging to Xen's by nopping out the call to 
LogAddDisposition(...XEN_PORT...) in src/xen/driver.c.
  Paul