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List:       linux-kernel
Subject:    Re: [PATCHv3 10/10] xen/balloon: pre-allocate p2m entries for ballooned pages
From:       Daniel Kiper <daniel.kiper () oracle ! com>
Date:       2015-07-31 23:23:50
Message-ID: 20150731232350.GE3488 () olila ! local ! net-space ! pl
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On Thu, Jul 30, 2015 at 06:03:12PM +0100, David Vrabel wrote:
> Pages returned by alloc_xenballooned_pages() will be used for grant
> mapping which will call set_phys_to_machine() (in PV guests).
>
> Ballooned pages are set as INVALID_P2M_ENTRY in the p2m and thus may
> be using the (shared) missing tables and a subsequent
> set_phys_to_machine() will need to allocate new tables.
>
> Since the grant mapping may be done from a context that cannot sleep,
> the p2m entries must already be allocated.
>
> Signed-off-by: David Vrabel <david.vrabel@citrix.com>

Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>

Daniel

PS FYI, next week I am on vacation.
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