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xen-ia64-devel
RE: [Xen-ia64-devel] shared_info and privregs
>From: Tristan Gingold
>Sent: 2006年5月15日 16:17
>Hi,
>
>currently shared_info and privregs are allocated on xenheap.
>I propose to allocate them on domheap and to map these pages on
>domain pseudo
>physical memory.
>I think this is more logical and will help for save and restore (make them
>accessible by dom0).
>
>Comments ?
>
>Tristan.
>
Hi, Tristan,
Following link talks some background about why shared_info is
allocated from xenheap:
http://lists.xensource.com/archives/html/xen-devel/2006-01/msg00258.html
For xen/ia64, to allocate shared_info from domheap faces less
boring issues as x86, but you have to consider several common issues
like refcnt or domain statistic accounting mentioned from the thread. I
believe those can be worked around, but you may check whether worthy
of doing that. :-)
BTW, it may be a good idea to add shared_info page (even from
xeneheap) into the domain's pseudo memory space, especially when
current ia64 dom0 is based on p!=m model. In that way, dom0 can simply
map all domain's memory including shared_info by uniform interface.
Hope helps a bit.
Thanks,
Kevin
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