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[Xen-devel] big memory and balloons

I want to put Xen on some 2GB hosts and am exploring the balloon
mechansism.  If I try to inflate the balloon more than 32768 pages at a
time, the guest OS gets an oops:
  Unable to handle kernel NULL pointer dereference at virtual address 00000000

Deflating the balloon crashes the guest:
  <1>bd240 debug: deflate balloon called for fa0 pages
  Kernel panic: Failed mmu update: c019a3c0, 2048

Xen and DOM0 keep on running fine :-)

Is deflation required?  Or does Xen hand out pages on demand as guests
need them?

Is the linux config setting HIGHMEM4G supported?  If not, can Xen itself
see all 2GB and hand out independent 800MB chunks to guests?

Domain creation works just fine with today's pull.  Thanks!
I saw that recent CD-ROM post, my CD-ROM works fine.
I can use a CD as a root partition.

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