Libguestfs - Feb 2012 - want to access the page file of VM from host on Xen platform using libguestfs

I am using Xen and want to access the page file contents of? windows XP SP2
virtual machine from dom0. Is it possible to read the page file of live Windows
XP virtual machine using libguestfs. I have a C program and want to extend its
functionality using libguestfs. Any idea how this can be done using libguestfs.

--Irfan
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On Thu, Feb 09, 2012 at 03:17:22PM -0800, Irfan Ahmed
wrote:
> I am using Xen and want to access the page file contents of? windows
> XP SP2 virtual machine from dom0. Is it possible to read the page
> file of live Windows XP virtual machine using libguestfs. I have a C
> program and want to extend its functionality using
> libguestfs. Please help me how this can be done.
Yes; this can be done by reading the file through libguestfs, which is
what 'virt-cat' (a C program) does.

I would suggest you start with these two examples:

http://libguestfs.org/guestfs-examples.3.html
https://github.com/libguestfs/libguestfs/blob/6ca8a2db6d6f1028a35ece616af44538074483fc/cat/virt-cat.c#L273

If you need to locate the page file (ie. it's not in a default
location) then you will have to read that from the registry, which
libguestfs can also do.

If the guest is live you won't simply be able to keep a handle open
and re-read the file.  You might need to map the file to disk blocks
and read them directly.  (This is a bit more experimental)

Rich.

-- 
Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones
virt-top is 'top' for virtual machines.  Tiny program with many
powerful monitoring features, net stats, disk stats, logging, etc.
http://et.redhat.com/~rjones/virt-top