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xen-devel
Re: [Xen-devel] Re: dom0 bootstrap for xenstore
On 16 Jun 2005, at 14:55, Keir Fraser wrote:
Either we need a new interface for mmaping local xenstore page, or we
need to hack one of the existing /dev/mem or xc_map_foreign_range
ioctl. None of these options is very pleasant. :-( I think simplest
would be to extend the gross /proc/xen/privcmd to have a mmap that we
can use to mmap xenstore page (maybe make a little more general
purpose by turning offset field of mmap into an enumeration, so we can
map other useful Xen-specific bits and bobs via it in the future).
Brainwave: what if you mark the xenstore page as PageReserved? This is
easy to do if you allocate the page from within the kernel (rather than
user space) as you can mark it reserved at the same time you allocate
it. Then you ought to be able to use xc_map_foreign_page without
problems. And it makes sense -- the xenstore page is not a normal
page-cache/VM page.
I think this is a one-line addition to your previous patch. :-)
-- Keir
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