lkml.org 
[lkml]   [2015]   [May]   [20]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [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.


\
 
 \ /
  Last update: 2015-05-20 17:41    [W:0.081 / U:0.032 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site