[Xen-devel] About the page lock while updating mmu.

["Xu, Dongxiao" <dongxiao.xu@xxxxxxxxx>]

Hi, Keir and Jan,
 
    In C/S 17846, page lock is used instead of the per-domain lock. It
uses the spin lock in page_info structure to ensure the unique access
into the page. But while updating mmu (l1_entry, l2_entry, l3_entry,
l4_entry), I think these pages should be described by shadow_page_info,
but not page_info. However there is no spin lock defined in
shadow_page_info structure. 

    This may be the root cause for Xen bug 1278:
(On 32E, XenU guest can not boot up after destorying a HVM guest.
http://bugzilla.xensource.com/bugzilla/show_bug.cgi?id=1278)

Best Regards,
-- Dongxiao


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