Re: [Xen-devel] DomU - DomU grant table

[Wei Liu <liuw@xxxxxxxxx>]

On Wed, Aug 21, 2013 at 9:41 PM, Maslekar, Omkar
<omkar.maslekar@xxxxxxxxx> wrote:
> Sorry , I forgot to mention, I am using HVM,
> I was successful in PV for same code
>

There is example in that file for HVM as well.

> -----Original Message-----
> From: Wei Liu [mailto:liuw@xxxxxxxxx]
> Sent: Wednesday, August 21, 2013 1:39 PM
> To: Maslekar, Omkar
> Cc: Wei Liu; xen-devel@xxxxxxxxxxxxx
> Subject: Re: [Xen-devel] DomU - DomU grant table
>
> On Wed, Aug 21, 2013 at 9:10 PM, Maslekar, Omkar <omkar.maslekar@xxxxxxxxx> 
> wrote:
>> Hi,
>>
>> (first domU1 code with Domain id =4)
>>
>> share_mem = (share_mem_desp *) __get_free_page(GFP_KERNEL);
>> share_mem->gref = gnttab_grant_foreign_access(2,
>> virt_to_mfn(share_mem), 0);
>>
>> Output gref= 110
>>
>> second domU (domain id = 2)
>>
>> share_vmarea = alloc_vm_area(PAGE_SIZE); gnttab_set_map_op( &map_op,
>> (unsigned long)share_vmarea->addr, GNTMAP_host_map, 110, 4 );
>> HYPERVISOR_grant_table_op( GNTTABOP_map_grant_ref, &map_op, 1 );
>>
>
> Presumably you're using PV here. Please refer to 
> xenbus_client.c:xenbus_map_ring_valloc_pv for example.
>
> Wei.
>
>> I tried changes flags GNTMAP_host_map with Application and PTE, Can you tell 
>> me what else can go wrong here.
>>
>> Thanks,
>>
>>
>>
>>
>> -----Original Message-----
>> From: Wei Liu [mailto:liuw@xxxxxxxxx]
>> Sent: Tuesday, August 20, 2013 9:47 AM
>> To: Maslekar, Omkar
>> Cc: Wei Liu; xen-devel@xxxxxxxxxxxxx
>> Subject: Re: [Xen-devel] DomU - DomU grant table
>>
>> On Tue, Aug 20, 2013 at 5:16 PM, Maslekar, Omkar <omkar.maslekar@xxxxxxxxx> 
>> wrote:
>>> Hi Liu,
>>>
>>> From DomU to Dom0 with passing gref works very well and memory shared 
>>> verified by string contents.
>>> However from dom0 to domU ( and similarly between two DomU) if I run same 
>>> code( passing correct ID and gref) I am getting kernel panic error.
>>
>> I'm afraid you need to be more specific here. If you setup gref correctly I 
>> don't see why it wouldn't work.
>>
>>> I am not setting up channel, I want simple string passing between two DomU.
>>>
>>
>> What I mean is to pass the correct configuration to both side.
>>
>> Wei.
>>
>>> I followed
>>> http://old-list-archives.xen.org/archives/html/xen-devel/2011-06/msg0
>>> 2
>>> 037.html
>>>
>>> Thanks,
>>> Omkar
>>>
>>> -----Original Message-----
>>> From: Wei Liu [mailto:wei.liu2@xxxxxxxxxx]
>>> Sent: Tuesday, August 20, 2013 1:07 AM
>>> To: Maslekar, Omkar
>>> Cc: xen-devel@xxxxxxxxxxxxx; wei.liu2@xxxxxxxxxx
>>> Subject: Re: [Xen-devel] DomU - DomU grant table
>>>
>>> On Mon, Aug 19, 2013 at 05:36:09PM +0000, Maslekar, Omkar wrote:
>>>> Hi,
>>>> What changes are needed to run grant table code which access page between 
>>>> two domU.
>>>>
>>>> I have working code between domU to dom0.
>>>>
>>>
>>> We have driver domain which is DomU serving as backend for another DomU. In 
>>> short grant table just works between DomUs.
>>>
>>> You're likely only required to setup the channel (via xenstore with the 
>>> help from toolstack) and everything should hopefully just work.
>>>
>>> Wei.
>>>
>>>> Thanks,
>>>
>>>> _______________________________________________
>>>> Xen-devel mailing list
>>>> Xen-devel@xxxxxxxxxxxxx
>>>> http://lists.xen.org/xen-devel
>>>
>>>
>>> _______________________________________________
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>>> Xen-devel@xxxxxxxxxxxxx
>>> http://lists.xen.org/xen-devel

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