Avoid cache duplication in virtual/paravirtual filesystems

I would like to propose a discussion on VirtFS, a 9P based paravirtual filesystem for KVM.

Discuss unique advantages and issues with the paravirtual filesystems

I would like to discuss and get community feedback and ideas on how can we avoid cache
duplication(data and metadata) between host and guests.?

Given that both server (host) and client (guest) is running on the same hardware we should
be able to avoid double caching of both(host and guest) filesystems.

For details about VirtFS, please see my OLS paper
http://www.sciweavers.org/publications/virtfs-virtualization-aware-file-system-pass-through

Thanks
Venkateswararao Jujjuri (JV)
VirtFS - KVM
LTC, IBM.

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