Re: [Embedded-pv-devel] Driver domain under Xen

[Andrii Tseglytskyi <andrii.tseglytskyi@xxxxxxxxxxxxxxx>]

Hi Julien,

On Fri, Jan 23, 2015 at 5:01 PM, Julien Grall <julien.grall@xxxxxxxxxx> wrote:
> On 23/01/15 14:56, Andrii Tseglytskyi wrote:
>> Thank you for your interest. I hope we will upstream some of changes.
>> To make driver domain running we need to have it memory 1 to 1 mapped.
>> And we did some changes to have a possibility to map *any* domain 1 to
>> 1 if needed. This requires hypervisor + toolstack changes. This is the
>> best candidate for upstream as soon as it will be rewritten properly
>> :) Oleksandr Tyschenko is now working on this.
>
> I'm concerned about a such change in Xen upstream. Any device
> passthrough to a domain should be protected by IOMMU.
>
> Using the 1:1 mapping means you want to passthrough a non-protected
> device. So the driver domain could issue a DMA request to override any
> part of the memory (such as Xen or DOM0).

Using DMA is an idea here. We don't have SMMU support on our platform.

Regards,
Andrii
>
> --
> Julien Grall



-- 

Andrii Tseglytskyi | Lead engineer
GlobalLogic
www.globallogic.com

_______________________________________________
Embedded-pv-devel mailing list
Embedded-pv-devel@xxxxxxxxxxxxxxxxxxxx
http://lists.xenproject.org/cgi-bin/mailman/listinfo/embedded-pv-devel