Re: [Xen-devel] [PATCH] Fix auto-ballooning of dom0 for HVM domains

[Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>]

On 22 May 2006, at 15:51, Charles Coffing wrote:

> HVM domains need some extra memory free for the shadow page tables,
> otherwise they may crash the entire machine while they are running, or
> the HVM domain itself may crash (exact behavior depends on whether you
> have Yunhong's patch to change BUGs to domain_crash).
>
> This slack space is calculated into the memory size for HVM domains,
> but what happens if you then start a PV domain afterwards?  Only the
> minimally required memory is freed up, then the PV domain takes it all,
> leaving the HVM domain with no slack == crash.
Where does the slack from the previous HVM guest startup go? Are you 
saying that dom0 only frees up PV-guest-size minus existing-slack?
 -- Keir


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