Re: Help - KVM TODO_NOV2008_Sharing Memory between guests

[PICT PUNE <kvm.smartshare@xxxxxxxxx>]

On Wed, Feb 25, 2009 at 9:11 PM, Anthony Liguori <anthony@xxxxxxxxxxxxx> wrote:

Avi Kivity wrote:

PICT PUNE wrote:

In reference to the November 2008 todo list on Qumranet Website

we are a group of college students working on this todo:

*Add a qemu interface for sharing memory between guests. Using a pci device to expose the shared memory is probably a good starting point.
*
Can anyone suggest us some starting point or a possible approach for the same...

Write a PCI device that exposes a BAR containing RAM.  Implement the RAM by mapping a shared memory segment or a file.  Write a guest driver to use this shared RAM.

Or implement a virtio device that can advertise available shared memory segments.  Have guest allocate its own memory to send to host that becomes the shared memory segment.

Expose shared memory mappings via a virtual file system (similar to hugetlbfs or ramfs).

Using PCI BARs implies static shared memory mappings.  For a long running VM, you're likely to want to support dynamic shared memory mappings.

Also exposing a simple signaling mechanism with this too would allow for shared ring queues to be implemented in userspace between guests.

Regards,

Anthony Liguori

Hello Mr. Avi Kivity  and Mr. Anthony Liguori

Thanks for your early reply. We expecting the same approach. We are in process of making clusters of free memory  and reserve these memory as a fake PCI device for the guest  OS. this device will be then passed using PCI passthrough  to the guest from the host. Can you please help us in faking the free memory cluster as a PCI device. Thanking in anticipation.


Regards,

PICT Pune BE Students

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