[libvirt-users] converting save/dump output into physical memory image

[Eric Blake]

On 06/02/2012 12:20 PM, NoxDaFox wrote:

> 
> For what I know it's not possible to analyze memory contained in libvirt
> snapshots taken through qemu savevm.

qemu 'savevm' dumps in an internal migration format.  But you can use
the 'migrate' command to do a migration to disk, which at least some
memory analysis tools have learned how to reconstruct guest memory from.
 There is also a pending patch to libvirt to learn to use qemu's new
'dump-guest-memory' command which creates an ELF file corresponding to
guest memory at a given point in time.  The idea is that
virDomainCoreDump() API will map to both qemu monitor commands for
dumping guest memory.

With a bit more help from qemu, it may even someday be possible to take
a memory snapshot while still allowing the guest to run, and libvirt's
virDomainCoreDump() would gain a new flag to expose that capability.

-- 
Eric Blake   eblake at redhat.com    +1-919-301-3266
Libvirt virtualization library http://libvirt.org

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