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On Mon, Feb 23, 2009 at 11:07 AM, dinesh chandrasekaran <dinesh_chan8@xxxxxxxxxxx> wrote:

Yes. It will appear to be another PCI device sitting between the CPU and guest memory.

To achieve this I need to make sure that xen allocates guest memory from memory behind the crypto coprocessor.
This is the implementation issue I need to solve to get the project going.

I did try modifying common/memory.c : populate_physmap(), but I am afraid this is not the right place.
Since I have allocate real memory to domU, I am clueless.

Thanks,
Dinesh C
Date: Mon, 23 Feb 2009 10:44:34 -0500

Subject: Re: [Xen-devel] Academic Project
From: zephyr.zhao@xxxxxxxxx

To: dinesh_chan8@xxxxxxxxxxx
CC: xen-devel@xxxxxxxxxxxxxxxxxxx

I'm curious about the crypto coprocessor. Does it work like a memory controller? So every memory read/write will be encrypted/decrypted by it?

Thanks,
Weiming

On Mon, Feb 23, 2009 at 10:31 AM, dinesh chandrasekaran <dinesh_chan8@xxxxxxxxxxx> wrote:

From: dinesh_chan8@xxxxxxxxxxx
To: michal@xxxxxxxxx
Subject: RE: [Xen-devel] Academic Project
Date: Mon, 23 Feb 2009 00:46:01 +0530

Essentially, first step towards minimizing the trusted computing base.

Assuming the VMM is not compromised (after a secure boot), domU doesnt have to trust dom0.

For example, the following command issued from dom0 would dump the guest memory in dom0 hard disk,
xm save Guest guest_mem.dump

Using the crypto coprocessor, this can be encrypted, so that only domU can read/write and not dom0.
The result of the above command will store an encrypted dump file on the dom0 disk.

Thanks,
Dinesh C
From: michal@xxxxxxxxx
To: dinesh_chan8@xxxxxxxxxxx
Subject: Re: [Xen-devel] Academic Project
Date: Sun, 22 Feb 2009 19:31:32 +0100

And what is the purpose of this?
Seems to be trivial to get over it.

Sent from my iPhone

On Feb 22, 2009, at 6:19 PM, dinesh chandrasekaran <dinesh_chan8@xxxxxxxxxxx> wrote:

Hi Folks,
I'm developing a secure memory manager module for xen as a part of my academic project.
Thereby protecting DomU memory by moving the trust for memory protection from Dom0 to hardware by encrypting/
decrypting the guest memory on per-domain-secret key basis and realizing the same using a crypto coprocessor (FPGA)
with necessary software (XEN) hooks and interfaces.

Now one of the implementation issues is that how to move the domU memory allocation (both boot pages and application pages)
to fall behind the coprocessor by modifying xen source. If so where in the source tree the changes have to be made.

I did try modifying common/memory.c : populate_physmap(), but I am afraid this is not the right place.
Since I have allocate real memory to domU, I am clueless.

I would appreciate you If you could send me your valuable suggestions.

Thanks,
Dinesh C

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