Re: memory hotplug for guests?

[Avi Kivity <avi-atKUWr5tajBWk0Htik3J/w@public.gmane.org>]

Arnd Bergmann wrote:
>
> Another driver you might want to look at is the Xen balloon driver:
> http://81.161.245.2/lxr/http/source/linux-2.6-xen-sparse/drivers/xen/balloon/balloon.c
>
> The s390 driver is probably a better example though. One thing the
> Xen one got wrong is that its interface requires you do an hcall in
> order to get back a page that you gave up to the host. 

Er, that's what we do :)

> On s390, it
> simply maps the host empty_zero_page as COW into the guest like
> the initial memory, so you get a new page back with the regular
> method whenever you write to the guest real page.
>   

This has the advantage of surviving a guest reboot, but the disadvantage 
of not allowing the host to nack the request.

-- 
error compiling committee.c: too many arguments to function


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