Re: [Xen-devel] run time memory trap question

[Andrii Tseglytskyi <andrii.tseglytskyi@xxxxxxxxxxxxxxx>]

Hi Ian,


On Tue, Feb 18, 2014 at 1:05 PM, Ian Campbell <Ian.Campbell@xxxxxxxxxx> wrote:
> On Mon, 2014-02-17 at 17:38 +0200, Andrii Tseglytskyi wrote:
>> Hi
>>
>> >
>> > > Something like this.
>> >
>> > This solution sounds good.
>> >
>> > If I remembered correctly, you are writing a driver for IPU/GPU MMU, right?
>>
>>
>> Right. And for now I started developing something like shadow page
>> table algorithm. I need to create a trap for a real pagetable, which
>> is placed somewhere in domain heap memory. That's why I thought about
>> generic algorithm which can create a runtime trap for memory, which
>> address is not defined during compile time.
>
> I think you should handle this case by making the page r/o in the p2m
> and using the p2m fault handler rather than the MMIO trap
> infrastructure.
>
> See e.g. the live migration patches by Samsung.
>

I haven't thought in this direction. I will investigate this
possibility. Thank you for suggestion. Just for now I implemented
solution, discussed in previous mails and it works fine for me, but
I'll try what you suggesting - it may be a better way.

Thank you,

regards,
Andrii

-- 

Andrii Tseglytskyi | Embedded Dev
GlobalLogic
www.globallogic.com

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