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

["Maslekar, Omkar" <omkar.maslekar@xxxxxxxxx>]

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 );

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/msg02
> 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
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>
>
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