Re: Xen Booting Problem on ARM Machine

[Sai Kiran Kumar Reddy Y <ysaikiran1997@xxxxxxxxx>]

On Fri, Sep 10, 2021 at 7:30 PM Julien Grall <julien@xxxxxxx> wrote:

On 08/09/2021 11:43, Sai Kiran wrote:
> Hello,

Hi,

Thank you for the report. Moving the discussion back to xen-devel
because this looks like a potential issue in the UEFI stub in Xen.

> I have Xen-4.15.0 on an ARM Machine, with Debian 11 installed on it.

Would you be able to give more details on the Arm machine you are using?
Also, are you using ACPI or DT to boot?

   Sai >> DT . ACPI configuration is disabled in Boot settings    

>  I
> am able to do “make world” and “make install”, after “./configure”, as
> specified in README file. When I reboot the system, I get the following
> message:
>
> Warning: All 128 bootinfo mem banks exhausted.
>
> Warning: All 128 bootinfo mem banks exhausted.

Hmmm... This means that you have more than 128 memory regions described
in the EFI memory map. That's quite a lot.

Although, this should be harmless as it means Xen will not use the extra
memory banks.

>
> Cannot exit boot services: ErrCode: 0x8000000000000002

This means EFI_INVALID_PARAMETER. We have code to retry because AFAICT
ExitBootServices() may sometime fails (I have CCed Jan may have more
idea what's happening).

Would you be able to provide more details on the UEFI firmware you are
using? Is it EDK2 or U-boot?

Sai >>  EDK2 

Also, do you know if Linux is boot on the same system?

Sai >> Yes 

However, AFAICT, the error message would not prevent Xen to continue
booting. So you may get stuck later in the boot process.

My suggestion would be to enable earlyprintk for your platform. You can
setup it up from the menuconfig in "Debugging Options".

Sai >> Yes, I have enabled earlyprintk.

I tried changing NR_MEM_BANKS(in xen/include/asm-arm/setup.h) value to 256, from 128. The error message is no longer seen, but the device is stuck in the boot process.

>
> Here is the snapshot of the error.

Please avoid posting image on the ML. Instead, if you need to do it, you
can upload on a web server and provide the URL.

Best regards,

--
Julien Grall