Re: [Xen-devel] [PATCH 3 of 4] KEXEC: Allocate crash structures in low memory

[Keir Fraser <keir@xxxxxxx>]

On 09/03/2012 16:24, "Andrew Cooper" <andrew.cooper3@xxxxxxxxxx> wrote:

> On 09/03/12 15:52, Keir Fraser wrote:
>> On 09/03/2012 14:42, "Andrew Cooper" <andrew.cooper3@xxxxxxxxxx> wrote:
>> 
>>> On 64bit Xen with 32bit dom0 and crashkernel, xmalloc'ing items such
>>> as the CPU crash notes will go into the xenheap, which tends to be in
>>> upper memory.  This causes problems on machines with more than 64GB
>>> (or 4GB if no PAE support) of ram as the crashkernel physically cant
>>> access the crash notes.
>> Why wouldn't you run a 64-bit crashkernel?
>> 
>>  -- Keir
> 
> There is certainly an argument to be made along those lines, and I
> personally lean to that side of the argument.  However, as our dom0
> kernel is 32bits, there is no substantial testing of the drivers built
> for 64bit.

Yes, I suppose this sounds pretty reasonable.

 -- Keir



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