Re: [Xen-devel] debian stretch dom0 + xen 4.9 fails to boot

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 07.06.17 at 13:55, <Paul.Durrant@xxxxxxxxxx> wrote:
>> From: Jan Beulich [mailto:JBeulich@xxxxxxxx]
>> Sent: 07 June 2017 12:50
>> 2) Provide the E820 map of that box.
>> I'm suspecting the BIOS might use an EBDA without recording it in
>> the low BIOS data area. If it's reported in E820 that would then
>> likely be the final kick for us to obey to the E820 map when
>> determining where to put the trampoline.
>> 
> 
> The stretch kernel booted bare-metal reports:
> 
> [    0.000000] e820: BIOS-provided physical RAM map:
> [    0.000000] BIOS-e820: [mem 0x0000000000000000-0x00000000000963ff] usable
> [    0.000000] BIOS-e820: [mem 0x0000000000096400-0x000000000009ffff] reserved

There we go. Subtracting 4k may then even be too little (depending
what EBDA and low memory values the system reports). Of course
it would be a BIOS bug if they reported some memory they use for
themselves through only E820, as that interface is not required to
be present, and really, really old software wouldn't even know
about it and would hence also be in trouble.

Jan


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