[Xen-devel] RE: [PATCH] to fix the bug for tboot on x86_32 brought by c/s 19914 and 19922

["Wang, Shane" <shane.wang@xxxxxxxxx>]

Keir Fraser wrote:
> On 06/11/2009 11:29, "Shane Wang" <shane.wang@xxxxxxxxx> wrote:
> 
>> The changesets 19914 and 19922 remove the bitmap for boot allocator,
>> which causes first_valid_mfn is reduced and starts from the end of
>> xen. On the other hand, on x86_64, the xen heap is got considering
>> e820 table, while on x86_32 the xen heap is specified to be <
>> xenheap_phys_end. This range overlaps tboot range. So, the tboot
>> range is scrubbed by scrub_heap_pages() during start_xen() on
>> x86_32. Then the result is that for TXT support on x86_32,
>> shutdown/reboot/Sx doesn't work properly. (i.e. hang) 
> 
> So... The problem is that xenheap on x86_32 does not respect e820?
> I'll fix that if that's the issue. It will be a much smaller change,
> and to arch/x86/setup.c only.
Yes, it is. It seems x86_32 only respects after xenheap is created.

> 
>  -- Keir
> 
>> This patch is to fix that by reserving tboot range as "inuse" in xen
>> heap on x86_32. Then xen code will not touch the range.


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