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xen-devel
Re: [Xen-devel] Re: mapcache broken?
On 10 Jan 2006, at 10:06, Keir Fraser wrote:
The map_io_shared_page determines that there are 0 entries in the
e820 map.
The map itself doesn't appear to fail which probably means that a
page full
with 0's is mapped and this would indicate at a problem with the
mapcache
(this is just a conjecture, I haven't actually added to code to test
this,
I only had 10min to look at this).
Yeah, I realised this might be a problem for VMX last night. Problem
is that certain pagetables get map_domain_page()'ed for the lifetime
of the guest, and are expected to then be mapped in all address
spaces. Now the mapcache is per domain, this 'trick' won't work.
A new shadow mode should not do such long-term mappings. I'll see if I
can come up with a temporary solution for current shadow mode (maybe
reintroduce ioremap()...).
Hopefully fixed now (changeset 8542 "Add new map_domain_page_global()
interface..."). May take a couple of hours to appear in the public
tree.
-- Keir
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