Re: [Xen-devel] [PATCH 0/2] block/xen-blkfront: Support non-indirect with 64KB page granularity

[Bob Liu <bob.liu@xxxxxxxxxx>]

On 09/14/2015 01:47 AM, Julien Grall wrote:
> 
> 
> On 13/09/2015 13:44, Bob Liu wrote:
>> I may misunderstood here.
>> But I think same changes are also required even if backend supports indirect 
>> grant when frontend is using 64KB page granularity.
>> Else
>> 1) How to set up the grant map for requests in domU?
>> The minimum segment buffer size in a request is PAGE_SIZE(64KB) while grant 
>> is 4KB based.
>>
>> 2) Codes like below in blkback.c may not work correctly?
>> if ((req->u.rw.seg[i].last_sect >= (PAGE_SIZE >> 9)) ||
>>
>> Because PAGE_SIZE in backend is 4KB, while the written value by domU is 64KB 
>> based.
> 
> As mention in my cover letter, this patch is not self-sufficient to support 
> 64KB guest. It's a follow-up of the 64KB page granularity support I sent on 
> the ML (the new version was sent earlier this week [1]).
> 
> One of the patch [2] is taking care of breaking down the I/O request in 
> multiple 4KB segment that will be used in the ring request. You may want to 
> give a look to this patch before looking to this series.
> 

Oh, sorry! I'll have a look at those patches.

Thanks,
-Bob

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