[Xen-devel] [PATCH]Add a flag for shadow pages

["Jiang, Yunhong" <yunhong.jiang@xxxxxxxxx>]

Currently we don't know that a page is a shadow page unless we are in shadow 
handler. This cause error when we try to get the page owner for the shadow 
page, this snippet add a flag to it.

signed-off-by: Jiang, Yunhong <yunhong.jiang@xxxxxxxxx>

I'm not quite sure if the sh_put_ref() and sh_rm_write_access_from_sl1p() is 
try to checking a page is shadow page (I assume so), because when a anonymous 
page is allocated, the count_info is also 0 (like HVM's vlapic page), so I 
change it like this patch (checking PGC_count_mask is 0). Since comments in 
sh_hash_audit_bucket() has stated clearly it is to check if it is shdow, so I 
replace it with test_bit().

Also, do we need checking in page_get_owner() also?

Thanks
Yunhong Jiang

Attachment: new_shadow_flag.patch
Description: new_shadow_flag.patch

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