linux-kernel - Re: [PATCHv3 10/10] xen/balloon: pre-allocate p2m entries for ballooned pages

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Message-ID: <20150731232350.GE3488@olila.local.net-space.pl>
Date:	Sat, 1 Aug 2015 01:23:50 +0200
From:	Daniel Kiper <daniel.kiper@...cle.com>
To:	David Vrabel <david.vrabel@...rix.com>
Cc:	linux-kernel@...r.kernel.org, xen-devel@...ts.xenproject.org,
	linux-mm@...ck.org, Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	Boris Ostrovsky <boris.ostrovsky@...cle.com>
Subject: Re: [PATCHv3 10/10] xen/balloon: pre-allocate p2m entries for
 ballooned pages

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@...rix.com>

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

Daniel

PS FYI, next week I am on vacation.
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