Re: [Xen-devel] [RFC] x86/boot: Don't use BDA value if it's suspiciously small

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 26.08.16 at 16:53, <s.munaut@xxxxxxxxxxxxxxxxxxxx> wrote:
>>  I'm not sure. I'd like to see the current logic altered as little as
>> possible, and what you suggest above is more than that minimum.
> 
> Then, that would be more like the very first patch I posted but just
> change the 0x1000 low limit to 0x4000.

I thought I had made clear that I think this then ought to be 0x1050.

>> So another question: Can you
>> detect whether we get booted from Linux (i.e. do they provide
>> any kind of identification anywhere)?
> 
> The multiboot info struct has the boot loader name optional field and
> kexec does fill it with "kexec x.y.z".

Perhaps better to simply ignore the two BDA values in that special
case then? Andrew, what do you think?

Jan


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