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RE: grant table anxiety [was RE: [Xen-devel] GNTTABOP_unmap_grant_ref]

To: "King, Steven R" <steven.r.king@xxxxxxxxx>, "Keir Fraser" <Keir.Fraser@xxxxxxxxxxxx>, "Mark Williamson" <mark.williamson@xxxxxxxxxxxx>, "Rusty Russell" <rusty@xxxxxxxxxxxxxxx>
Subject: RE: grant table anxiety [was RE: [Xen-devel] GNTTABOP_unmap_grant_ref]
From: "Ian Pratt" <m+Ian.Pratt@xxxxxxxxxxxx>
Date: Wed, 25 Jan 2006 22:36:58 -0000
Cc: xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxx>
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Thread-topic: grant table anxiety [was RE: [Xen-devel] GNTTABOP_unmap_grant_ref]
> I've aired grievances against grant tables in other threads, 
> but now I'm getting worried all over again.  Your suggestions 
> give a hint of the intricate handling required to manage 
> shared pages.  IMHO, this pushes paravirtual guests to 
> unnatural lengths, not to mention prospects in pure-virtual 
> environments.

Allowing user space to get access to shared pages by allowing them to
map pages in a special device seems pretty sensible, and is pretty
trivial to implement in the kernel.

> Could we dispense with these complexities if a 3rd party 
> (Xen?) owned shared pages?  

No, the accounting issue is totally orthogonal. 


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