Re: Xen/arm: Virtual ITS command queue handling

[Julien Grall <julien.grall@citrix.com>]

On 05/05/15 14:51, Stefano Stabellini wrote:
>> - With this irq/LPI descriptor we can identify the domain/vITS.
>> - Info of all the ongoing ITS requests(put in pITS Queue) of this domain is
>>   stored in ITS command status array (called its_requests). This is
>> managed per vITS.
>>
>> 1) Trap of CWRITER write by guest
>> 2) Take vITS lock
>> 3) Read all the commands written by guest, translate it
>>     - If one of the guest command is INT command
>>        a) Append INT command with completion_irq and write this batch as
>>           seperate request and goto (3) to process next commands
>>     - If more than 'n' commands are sent by guest, start a timer to process
>>       remaining commands
>> 4) Append INT command with completion_irq of current domain
> 
> I would consider adding a vcpu_block call

I don't think the vcpu_block would improve performance here.

Regards,

-- 
Julien Grall