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[Xen-users] How the file-backed VBD works in PV domain?

Hello Everyone,

I'm currently looking into how Xen(PV) Disk I/O works.
And I want to know how they works in source level.

As we know, HVM uses QEMU and the PV / PVHVM uses Dom0 backend driver.
And I could find that the Dom0 kernel(driver/block/xen-blkback/blkback.c) do disk I/O in LVM-backed VBD.

But, I want to use File-backed VBD rather than LVM-backed VBD.
I found that if I use file-backed VBD, then they don't use Dom0 backend driver.

So, Can I use backend driver in file-backed I/O?
and I want to know how the file-backed VBD works in PV domain.

Thank you very much.

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