linux-kernel - Re: [Xen-devel] [PATCHv2 10/10] xen/balloon: pre-allocate p2m entries for ballooned pages

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Date:	Mon, 27 Jul 2015 10:30:33 +0100
From:	David Vrabel <david.vrabel@...rix.com>
To:	Julien Grall <julien.grall@...rix.com>,
	David Vrabel <david.vrabel@...rix.com>,
	<xen-devel@...ts.xenproject.org>
CC:	Boris Ostrovsky <boris.ostrovsky@...cle.com>, <linux-mm@...ck.org>,
	"Daniel Kiper" <daniel.kiper@...cle.com>,
	<linux-kernel@...r.kernel.org>
Subject: Re: [Xen-devel] [PATCHv2 10/10] xen/balloon: pre-allocate p2m entries
 for ballooned pages

On 25/07/15 00:21, Julien Grall wrote:
> On 24/07/2015 12:47, David Vrabel wrote:
>> @@ -550,6 +551,11 @@ int alloc_xenballooned_pages(int nr_pages, struct
>> page **pages)
>>           page = balloon_retrieve(true);
>>           if (page) {
>>               pages[pgno++] = page;
>> +#ifdef CONFIG_XEN_HAVE_PVMMU
>> +            ret = xen_alloc_p2m_entry(page_to_pfn(page));
> 
> Don't you want to call this function only when the guest is not using
> auto-translated physmap?

xen_alloc_p2m_entry() is a nop in auto-xlate guests, so no need for an
additional check here.

David
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