Memory image of kvm guest

Memory image of kvm guest

[Tomas Kouba]

Hello,
is it possible to see and modify guest memory of the guest running under kvm?
For example when I know the address of a kernel symbol, can I read the memory
of the symbol in my application running on host?

(I am quite new to KVM but similar things are possible in XEN via xenctrl library calls).

Thank you,

-- 
Tomas Kouba

Re: Memory image of kvm guest

[Jan Kiszka]

Tomas Kouba wrote:
> Hello,
> is it possible to see and modify guest memory of the guest running under
> kvm?
> For example when I know the address of a kernel symbol, can I read the
> memory
> of the symbol in my application running on host?
> 
> (I am quite new to KVM but similar things are possible in XEN via
> xenctrl library calls).

Even better: Inherited from QEMU, KVM provides a full-blown gdb backend.
So you can do source-level debugging of your guest very comfortably. If
you just want to get the content of some memory chunk: QEMU monitor, 'x'
(as known from gdb, see also qemu/qemu-doc.html). But modification
requires a gdb frontend again.

Jan

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