Hollis Blanchard wrote: > The PowerPC 440 Linux kernel uses 256MB pages for the linear mapping. > When we run that as a guest, those pages would of course need to be > physically contiguous in the host. > > I think long-term the KVM plan is to move memory allocation out of the > kernel (where it currently uses vmalloc) into userspace, with the idea > being that userspace could allocate memory via hugetlbfs. Anybody tried > hugetlbfs on 440 or e500? > there is already kvm patch that move the memory allocation to userspace you can check it out. it will be merged to kvm as soon as some swapping issues will be address... > A poor-man's equivalent might be to limit the host memory to e.g. 256MB, > then have userspace mmap(/dev/ram) starting there. > > Another possibility is to fake out guest large pages by actually using > small pages on the host, and handle the extra faults in KVM without > notifying the guest. > >
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