Re: [PATCH v1 00/18] Hyperlaunch

["Daniel P. Smith" <dpsmith@xxxxxxxxxxxxxxxxxxxx>]

On 7/19/22 13:06, Smith, Jackson wrote:
> Hi Daniel,
> 
>> -----Original Message-----
>> Subject: [PATCH v1 00/18] Hyperlaunch
> 
> With the adjustments that I suggested in other messages, this patch builds 
> and boots for me on x86 (including a device tree with a domU). I will 
> continue to poke around and see if I discover any other rough edges.

Thank you so much for reviewing and testing!

> One strange behavior I see is that xen fails to start the Dom0 kernel on a 
> warm reboot. I'm using qemu_system_x86 with the KVM backend to test out the 
> patch. After starting qemu, xen will boot correctly only once. If I attempt 
> to reboot the virtual system (through the 'reboot' command in dom0 or the 
> 'system_reset' qemu monitor command) without exiting/starting a new qemu 
> process on the host machine, xen panics while booting after printing this:
> 
> (XEN) *** Building Dom0 ***
> (XEN) Dom0 has maximum 856 PIRQs
> (XEN) *** Constructing a PV Dom0 ***
> (XEN) ELF: not an ELF binary
> (XEN)
> (XEN) ****************************************
> (XEN) Panic on CPU 0:
> (XEN) Could not construct domain 0
> (XEN) ****************************************
> 
> This happens with the BUILDER_FDT config option on and off, and regardless of 
> what dtb (if any) I pass to xen. I don't see this behavior if I switch back 
> to xen's master branch.
> 
> Hopefully that explanation made sense. Let me know if I can provide any 
> further information about my setup.

That is certainly a very strange behavior. I never tested reboot as I
assumed it should just go through the same process as could boot. I will
add this to my tests to run and see if I can track down why it is happening.

V/r,
Daniel P. Smith