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Re: [Xen-devel] [PATCH] xen: set P2M entry to INVALID_P2M_ENTRY for ballooned out pages

On Thu, Aug 22, 2013 at 02:00:05PM +0100, David Vrabel wrote:
> On 22/08/13 13:57, Wei Liu wrote:
> > In commit cd9151e2: xen/balloon: set a mapping for ballooned out pages
> > we have the ballooned out page's mapping set to a scratch page. That commit
> > also set the P2M entry of ballooned out page to the scratch, which is
> > not necessary. That triggers BUG_ONs in __set_phys_to_machine when the
> > page is ballooned in again.
> > 
> > We only need to ensure that the ballooned out pages have valid mapping.
> > P2M entries of those pages should still be set to INVALID_P2M_ENTRY.
> I know I suggested this but I would like to get Stefano's acked-by or
> reviewed-by for this.

Stefano, what do you think?


> David

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