Re: [Xen-devel] [XEN][RFC PATCH V2 05/17] hvm: Modify hvm_op

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 10.09.12 at 15:02, Julien Grall <julien.grall@xxxxxxxxxx> wrote:
> On 08/24/2012 04:38 PM, Jan Beulich wrote:
>>>>> On 23.08.12 at 12:52, Julien Grall<julien.grall@xxxxxxxxxx>  wrote:
>>>>>          
>>> On 08/23/2012 08:27 AM, Jan Beulich wrote:
>>>      
>>>>> switch ( a.index )
>>>>> {
>>>>> -            case HVM_PARAM_IOREQ_PFN:
>>>>>
>>>>>          
>>>> Removing sub-ops which a domain can issue for itself (which for this and
>>>> another one below appears to be the case) is not allowed.
>>>>
>>>>        
>>> I removed these 3 sub-ops because it will not work with
>>> QEMU disaggregation. Shared pages and event channel
>>> for IO request are private for each device model.
>>>      
>> Then they need to be made inaccessible for that specific setup, not
>> removed altogether.
>>
>>    
> What do you mean by specific feature ?
> With this patch series, you are able to handle one or more
> QEMU.
> Keep a compatibility with the old IO emulation is hard.

Did you read my original reply? Code backing operations that a
guest can issue itself (i.e. without qemu or another host side
component involved) just can't be removed, as you/we have
no control over which guest(s) may be making use of that
functionality.

Jan


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