linux-kernel - Re: [PATCH] Xen backend support for paged out grant targets.

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Message-Id: <3B5D2C51-899F-47AF-BD59-36D7F9E3C045@gmail.com>
Date:	Thu, 13 Sep 2012 10:24:08 -0400
From:	Andres Lagar-Cavilla <andres.lagarcavilla@...il.com>
To:	Ian Campbell <ian.campbell@...rix.com>
Cc:	Andres Lagar-Cavilla <andres@...arcavilla.org>,
	xen-devel@....lists.org,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	David Vrabel <david.vrabel@...rix.com>,
	David Miller <davem@...emloft.net>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Xen backend support for paged out grant targets.

On Sep 13, 2012, at 3:14 AM, Ian Campbell wrote:

> On Wed, 2012-09-12 at 20:45 +0100, Andres Lagar-Cavilla wrote:
>> diff --git a/include/xen/interface/grant_table.h b/include/xen/interface/grant_table.h
>> index 7da811b..66cb734 100644
>> --- a/include/xen/interface/grant_table.h
>> +++ b/include/xen/interface/grant_table.h
>> @@ -520,6 +520,7 @@ DEFINE_GUEST_HANDLE_STRUCT(gnttab_get_version);
>> #define GNTST_permission_denied (-8) /* Not enough privilege for operation.  */
>> #define GNTST_bad_page         (-9) /* Specified page was invalid for op.    */
>> #define GNTST_bad_copy_arg    (-10) /* copy arguments cross page boundary */
> 
> What is -11?

-11 is something called GNTST_address_too_big on the xen public includes. Since it is not relevant too this patch I decided to skip over it. I will add a "placeholder" entry to the message array below to keep things properly aligned.

Thanks
Andres
> 
> Because...
> 
>> +#define GNTST_eagain          (-12) /* Retry.                                */
>> 
>> #define GNTTABOP_error_msgs {                   \
>>     "okay",                                     \
>> @@ -533,6 +534,7 @@ DEFINE_GUEST_HANDLE_STRUCT(gnttab_get_version);
>>     "permission denied",                        \
>>     "bad page",                                 \
>>     "copy arguments cross page boundary"        \
> 
> ... it should go here, otherwise retry is in the wrong place.
> 
> Perhaps we should switch this to the 
> 	[GNTTABOP_foo] = "foo"
> style of initialiser?
> 
>> +    "retry"                                     \
>> }
>> 
>> #endif /* __XEN_PUBLIC_GRANT_TABLE_H__ */ 
> 

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