Re: [Xen-devel] yanked share, round 2

[Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>]

On 13 Jan 2006, at 19:07, King, Steven R wrote:
 
> The purpose of the under-page is to plug the memory hole in the remote 
> DomU created by a surprise unsharing.  A nervous remote DomU could 
> check that a share is GTF_safe before proceeding to map the page.
>  
> Good, bad or ugly?
What's wrong with the current scheme (sharing domU sticks around as a 
zombie until foreign mappings disappear)? This needn't stop control 
tools from restarting the domain (they can see that it has shut down, 
for example, and is simply awaiting reaping when its refcnt falls to 
zero).
It's arguable the zombies needn't even be kept on the domain list, so 
they become invisible to the control tools (since they're really just a 
resource container for foreign page mappings). OTOH hiding things from 
control tools is probably a bad idea. :-)
 -- Keir


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