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

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Message-ID: <555CA0B9.9050108@citrix.com>
Date:	Wed, 20 May 2015 16:56:57 +0200
From:	Roger Pau Monné <roger.pau@...rix.com>
To:	Julien Grall <julien.grall@...rix.com>,
	Bob Liu <bob.liu@...cle.com>, <xen-devel@...ts.xen.org>
CC:	<linux-kernel@...r.kernel.org>, <justing@...ctralogic.com>,
	<paul.durrant@...rix.com>, <david.vrabel@...rix.com>
Subject: Re: [Xen-devel] [PATCH v4 2/2] xen/block: add multi-page ring support

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.

Roger.
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