linux-kernel - Re: [PATCH V3 1/2] xen/granttable: Support sub-page grants

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Date:	Sun, 11 Dec 2011 14:05:37 +0800
From:	ANNIE LI <annie.li@...cle.com>
To:	Ian Campbell <Ian.Campbell@...rix.com>
CC:	"xen-devel@...ts.xensource.com" <xen-devel@...ts.xensource.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"konrad.wilk@...cle.com" <konrad.wilk@...cle.com>,
	"jeremy@...p.org" <jeremy@...p.org>,
	Paul Durrant <Paul.Durrant@...rix.com>,
	"kurt.hackel@...cle.com" <kurt.hackel@...cle.com>
Subject: Re: [PATCH V3 1/2] xen/granttable: Support sub-page grants



On 2011-12-10 1:38, Ian Campbell wrote:
> On Fri, 2011-12-09 at 11:32 +0000, annie.li@...cle.com wrote:
>> -- They can't be used to map the page (so can only be used in a GNTTABOP_copy
>>         hypercall).
>>      -- It's possible to grant access with a finer granularity than whole pages.
>>      -- Xen guarantees that they can be revoked quickly (a normal map grant can
>>         only be revoked with the cooperation of the domain which has been granted
>>         access).
>>
>> Signed-off-by: Annie Li<annie.li@...cle.com>
>> ---
>>   drivers/xen/grant-table.c |   71 +++++++++++++++++++++++++++++++++++++++++++++
>>   include/xen/grant_table.h |   13 ++++++++
>>   2 files changed, 84 insertions(+), 0 deletions(-)
>>
>> diff --git a/drivers/xen/grant-table.c b/drivers/xen/grant-table.c
>> index bd325fd..0ac16fa 100644
>> --- a/drivers/xen/grant-table.c
>> +++ b/drivers/xen/grant-table.c
>> @@ -120,6 +120,16 @@ struct gnttab_ops {
>>   	 * by bit operations.
>>   	 */
>>   	int (*query_foreign_access)(grant_ref_t);
>> +	/*
>> +	 * Grant a domain to access a range of bytes within the page referred by
>> +	 * an available grant entry. First parameter is grant entry reference
>> +	 * number, second one is id of grantee domain, third one is frame
>> +	 * address of subpage grant, forth one is grant type and flag
>> +	 * information, fifth one is offset of the range of bytes, and last one
>> +	 * is length of bytes to be accessed.
>> +	 */
>> +	void (*update_subpage_entry)(grant_ref_t, domid_t, unsigned long, int,
>> +				     unsigned, unsigned);
> Please can you name the arguments here and then refer to them by name in
> the comments instead of all this "First parameter", "second one" stuff.
>
> Similarly for the existing comments sorry I didn't notice this in
> previous review.
Ok, I will do this in another separate patch.

Thanks,
Annie.
> Ian.
>
>
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