[Xen-devel] Re: [Xen-users] block level intercept with blktap

[Joseph Glanville <joseph.glanville@xxxxxxxxxxxxxx>]

Hi,

Developing blktap2 drivers in userspace is very easy.

You can find the source under tools/blktap2 in the Xen source tarball.
I suggest starting with the README and taking a look at tools/blktap2/drivers/block_ram.c which is a simple ramdisk implementation.
Blktap2 also allows the creation of "stacking" drivers which would probably be a good fit for an encryption driver as you could then use it with abitary backends.
CC'd the xen-devel list if anyone wants to chime in?

Just a note, take a look at the post to xen-devel about the tap-ctl utility being introduced, the documentation is yet to be updated to reflect it.

Joseph.

On 6 October 2011 08:01, <kuei.sun@xxxxxxxxxxx> wrote:

Hi all,

I am trying to implement a blktap driver which will intercept block data from DomU OS and perform encryption/decryption on the fly. Is this possible? Also, where can I get good documentation on the data structures used by blktap and how to install Xen from source on Debian Squeeze? Thank you all very much.

-Jack


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