RE: [RFC qemu 2/4] virtio-balloon: Add a new feature to balloon device

Subject: Re: [RFC qemu 2/4] virtio-balloon: Add a new feature to balloon
device

On Thu, Mar 03, 2016 at 06:44:26PM +0800, Liang Li wrote:

quoted

Extend the virtio balloon device to support a new feature, this new
feature can help to get guest's free pages information, which can be
used for live migration optimzation.

Signed-off-by: Liang Li <redacted>

I don't understand why we need a new interface.
Balloon already sends free pages to host.
Just teach host to skip these pages.

I just make use the current virtio-balloon implementation,  it's more complicated to
invent a new virtio-io device...
Actually, there is no need to inflate the balloon before live migration, so the host has
no information about the guest's free pages, that's why I add a new one.

Maybe instead of starting with code, you should send a high level description
to the virtio tc for consideration?

You can do it through the mailing list or using the web form:
http://www.oasis-
open.org/committees/comments/form.php?wg_abbrev=virtio

Thanks for your information and suggestion.

Liang