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xen-devel
Re: [Xen-devel] 2MB page PV guest support clarification
On 03/02/09 05:45, Dave McCracken wrote:
I am the person at Oracle working on PV guest support for 2MB pages. I did
get an initial patch accepted into the Xen hypervisor that enables basic 2MB
page support. As Keir said, it requires 'allowhugepage' on the Xen
hypervisor command line. It supports the basic ability to specify PSE in the
page table, and takes care of the associated type and reference tracking for
the mapped page(s).
What this patch does not do is make any guarantee about the alignment of the
mapped page, which is a hardware requirement. The solution I am working on
for this is to create domains with 2MB pages. The hypervisor already
supports populating a domain with larger pages. I am working on supporting
2MB page domains at creation time and restore time. This approach will also
require that balloon drivers understand and work with 2MB pages.
In my world, I make sure I allocate aligned contiguous machine 2MB
pages. Of course that may not always be possible, depending on what you
get from Xen. And I've seem some wild outer cases, such as swiss cheese
memory with every other page missing and no physical run longer than two
4K pages!
Mick
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