Re: [Qemu-devel] QEMU patch to allow VM introspection via libvmi

[Markus Armbruster]

Eduardo Habkost <address@hidden> writes:

> On Wed, Oct 21, 2015 at 12:54:23PM +0200, Markus Armbruster wrote:
>> Valerio Aimale <address@hidden> writes:
> [...]
>> > There's also a similar patch, floating around the internet, the uses
>> > shared memory, instead of sockets, as inter-process communication
>> > between libvmi and QEMU. I've never used that.
>> 
>> By the time you built a working IPC mechanism on top of shared memory,
>> you're often no better off than with AF_LOCAL sockets.
>> 
>> Crazy idea: can we allocate guest memory in a way that support sharing
>> it with another process?  Eduardo, can -mem-path do such wild things?
>
> It can't today, but just because it creates a temporary file inside
> mem-path and unlinks it immediately after opening a file descriptor. We
> could make memory-backend-file also accept a full filename as argument,
> or add a mechanism to let QEMU send the open file descriptor to a QMP
> client.

Valerio, would an command line option to share guest memory suffice, or
does it have to be a monitor command?  If the latter, why?

Eduardo, I'm not sure writing to guest memory behind TCG's back will
work.  Do you know?

Will it work with KVM?