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Hi, from the balloon driver for HVM Linux guests, I can see
that only direct map addresses or logical addresses can be used. So if a 32-bit
(PAE or otherwise) guest uses the balloon driver it can allocate up to a
maximum of where the low memory addresses end (GFP_KERNEL) 896 MB or from the
fixed map area of 128 MB which could be from low or high mem. Please let me
know if my assumption is correct. 2nd unlike a PV guest, where after alloc_empty_pages_and_pagevec
(e.g. blkback) and mapping in memory from another domain, if I alloc empty
balloon pages in an HVM and then try to access the page how will it be handled
by Xen? I see that a PV guest crashes if I access an empty page without mapping
anything into its place. Regards, Bhaskar. |
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