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

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Date:	Thu, 21 May 2015 07:47:34 +0800
From:	Bob Liu <bob.liu@...cle.com>
To:	Julien Grall <julien.grall@...rix.com>, roger.pau@...rix.com
CC:	xen-devel@...ts.xen.org, 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 05/20/2015 11:00 PM, Julien Grall wrote:
> 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.
> 

Sure, I'll make a update.

Roger, can I get your ack of these two patches except this comment update?

-- 
Regards,
-Bob
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