[Xen-devel] Possible to prevent dom0 accessing guest memory?

[Andy Smith <andy@xxxxxxxxxxxxxx>]

Hello,

Please forgive me if this is a naive question but I do not know this
low-level stuff very well.

If the ability of the toolstack to dump a guest's memory (e.g. xl
dump-core) were disabled on the hypervisor side, would there be any
other way to do so from dom0 without rebooting the machine into a
hypervisor that had the capability re-enabled?

I understand dom0 has privileges to map devices to guests; does that
give it a way to read arbitrary memory without need of toolstack
support?

The purpose of my question is in seeing if disk encryption in VMs
can be made slightly more useful. If there were no way for root in
dom0 to read guest memory without rebooting into a different
hypervisor then I think that would be a useful step.

Cheers,
Andy

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