linux-kernel - Re: [Xen-devel] [PATCH v4 2/2] xen/block: add multi-page ring support

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Message-ID: <555CA170.7070607@citrix.com>
Date:	Wed, 20 May 2015 16:00:00 +0100
From:	Julien Grall <julien.grall@...rix.com>
To:	Roger Pau Monné <roger.pau@...rix.com>,
	Julien Grall <julien.grall@...rix.com>,
	Bob Liu <bob.liu@...cle.com>, <xen-devel@...ts.xen.org>
CC:	<justing@...ctralogic.com>, <paul.durrant@...rix.com>,
	<linux-kernel@...r.kernel.org>, <david.vrabel@...rix.com>
Subject: Re: [Xen-devel] [PATCH v4 2/2] xen/block: add multi-page ring support

On 20/05/15 15:56, Roger Pau Monné wrote:
> El 20/05/15 a les 15.21, Julien Grall ha escrit:
>> Hi,
>>
>> On 20/05/15 14:10, Bob Liu wrote:
>>> ---
>>>  drivers/block/xen-blkback/blkback.c |  12 ++++
>>>  drivers/block/xen-blkback/common.h  |   3 +-
>>>  drivers/block/xen-blkback/xenbus.c  |  85 +++++++++++++++++++++-------
>>>  drivers/block/xen-blkfront.c        | 110 ++++++++++++++++++++++++++----------
>>>  4 files changed, 161 insertions(+), 49 deletions(-)
>>>
>>> diff --git a/drivers/block/xen-blkback/blkback.c b/drivers/block/xen-blkback/blkback.c
>>> index 713fc9f..057890f 100644
>>> --- a/drivers/block/xen-blkback/blkback.c
>>> +++ b/drivers/block/xen-blkback/blkback.c
>>> @@ -84,6 +84,12 @@ MODULE_PARM_DESC(max_persistent_grants,
>>>                   "Maximum number of grants to map persistently");
>>>  
>>>  /*
>>> + * Maximum number of pages to be used as the ring between front and backend
>>> + */
>>> +unsigned int xen_blkif_max_ring_order = XENBUS_MAX_RING_PAGE_ORDER;
>>
>> We will soon support 64KB page granularity with ARM64, although the PV
>> protocol will keep a 4KB page granularity.
>>
>> Can you clarify with granularity is used here? The one of the host or
>> the one of the PV protocol?
> 
> It's using 4K pages, because those are then granted to the domain
> handling the backend.

It would be nice to add a word in the comment.

Regards,

-- 
Julien Grall
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