[Xen-devel] BSS region in xen_in_range is incorrect

["Han, Weidong" <weidong.han@xxxxxxxxx>]

In c/s 21038, console_init_postirq frees default static ring buffer if a 
dynamic one was obtained. This makes dom0 can use the default static ring 
buffer which is in BSS region, but xen_in_range didn't remove the region from 
BSS region which won't be mapped in VT-d page table, so it causes problems when 
a device DMAs to that region. To fix this issue, 1) remove the freed region 
from BSS region in xen_in_range; 2) don't free default static ring buffer. 
Method 1) can fix it cleanly, but maybe need many changes. Method 2) is simple, 
but it wastes some resources.

Keir / Jan, what's your opinion?

Regards,
Weidong

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