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

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Message-Id: <3763C0C3-282F-403F-8665-47A13E5C1D29@gridcentric.ca>
Date:	Fri, 14 Sep 2012 10:27:59 -0400
From:	Andres Lagar-Cavilla <andreslc@...dcentric.ca>
To:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
Cc:	Ian Campbell <Ian.Campbell@...rix.com>,
	Andres Lagar-Cavilla <andres@...arcavilla.org>,
	"xen-devel@....lists.org" <xen-devel@....lists.org>,
	David Vrabel <david.vrabel@...rix.com>,
	David Miller <davem@...emloft.net>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: [PATCH] Xen backend support for paged out grant targets.


On Sep 14, 2012, at 8:44 AM, Konrad Rzeszutek Wilk wrote:

> On Fri, Sep 14, 2012 at 08:19:01AM +0100, Ian Campbell wrote:
>> On Thu, 2012-09-13 at 20:45 +0100, Andres Lagar-Cavilla wrote:
>>> On Sep 13, 2012, at 2:11 PM, Ian Campbell wrote:
>>> 
>>>> On Thu, 2012-09-13 at 18:28 +0100, Andres Lagar-Cavilla wrote:
>>>>> 
>>>>> * Add placeholder in array of grant table error descriptions for
>>>>> unrelated error code we jump over. 
>>>> 
>>>> Why not just define it, it's listed here:
>>>> http://xenbits.xen.org/docs/unstable/hypercall/include,public,grant_table.h.html#Enum_grant_status
>>> Well, a) we'd be defining something no one will be using (for the
>>> moment)
>> 
>> Even if no one in the kernel is using it, having "placeholder" as an
>> entry in GNTTABOP_error_msgs is just silly, even things which don't
>> understand GNTST_address_too_big directly could end up looking it up
>> here.
>> 
>>> b) I would be signing-off on something unrelated.
>> 
>> Lets take this patch instead then.
>> 
>> 8<------------------------------------------------
>> 
>>> From cb9daaf3029accb6d5fef58b450a625b27190429 Mon Sep 17 00:00:00 2001
>> From: Ian Campbell <ian.campbell@...rix.com>
>> Date: Fri, 14 Sep 2012 08:10:06 +0100
>> Subject: [PATCH] xen: resynchronise grant table status codes with upstream
>> 
>> Adds GNTST_address_too_big and GNTST_eagain.
>> 
>> Signed-off-by: Ian Campbell <ian.campbell@...rix.com>
> 
> applied.
Thanks. Rebased on top of this and just sent.
Andres
> 
>> ---
>> include/xen/interface/grant_table.h |    8 ++++++--
>> 1 file changed, 6 insertions(+), 2 deletions(-)
>> 
>> diff --git a/include/xen/interface/grant_table.h b/include/xen/interface/grant_table.h
>> index a17d844..84a8fbf 100644
>> --- a/include/xen/interface/grant_table.h
>> +++ b/include/xen/interface/grant_table.h
>> @@ -519,7 +519,9 @@ DEFINE_GUEST_HANDLE_STRUCT(gnttab_get_version);
>> #define GNTST_no_device_space  (-7) /* Out of space in I/O MMU.              */
>> #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 */
>> +#define GNTST_bad_copy_arg    (-10) /* copy arguments cross page boundary.   */
>> +#define GNTST_address_too_big (-11) /* transfer page address too large.      */
>> +#define GNTST_eagain          (-12) /* Operation not done; try again.        */
>> 
>> #define GNTTABOP_error_msgs {                   \
>>     "okay",                                     \
>> @@ -532,7 +534,9 @@ DEFINE_GUEST_HANDLE_STRUCT(gnttab_get_version);
>>     "no spare translation slot in the I/O MMU", \
>>     "permission denied",                        \
>>     "bad page",                                 \
>> -    "copy arguments cross page boundary"        \
>> +    "copy arguments cross page boundary",       \
>> +    "page address size too large",              \
>> +    "operation not done; try again"             \
>> }
>> 
>> #endif /* __XEN_PUBLIC_GRANT_TABLE_H__ */
>> -- 
>> 1.7.10.4
>> 
>> 

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