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

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 07.06.17 at 14:02, <Paul.Durrant@xxxxxxxxxx> wrote:
>> From: Juergen Gross [mailto:jgross@xxxxxxxx]
>> Sent: 07 June 2017 12:57
>> 
>> On 07/06/17 13:06, Paul Durrant wrote:
>> > It appears that it is just the code that needs to go at the end. The 
>> > following
>> patch is sufficient to avoid the problem. This may be preferable to a full
>> reversion...
>> 
>> I believe this is wrong. You risk the wakeup_stack extending into wakeup
>> code and the main reason of the patch is gone, as now the permanent
>> trampoline no longer is on a single page.
>> 
> 
> I must be misunderstanding something then. The stack grows down from 
> wakeup_stack towards wakeup_stack_start doesn't it? So why would there be an 
> issue with the stack overwriting wakeup code?

I think this is a pointless discussion: Once we know memory is being
corrupted, it doesn't help shuffling things around. By putting the
wakeup code at the end, it'll be that which gets corrupted, and
hence S3 wakeup would not work. We can really only try to figure
out what parts of memory we need to avoid touching _at all_.

Jan


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