Re: [Xen-devel] Xen ARM small task (WAS: Re: [Xen Question])

[Julien Grall <julien.grall@xxxxxxx>]

Hi Edgar,

On 23/11/16 16:38, Edgar E. Iglesias wrote:
> On Wed, Nov 23, 2016 at 06:26:06PM +0200, Artem Mygaiev wrote:
> > On 23.11.16 17:19, Julien Grall wrote:
> > > There is a couple of usecase where we cannot use PV console:
> > >     - Running unmodified baremetal application as guest. Those
> > > applications will not have PV driver.
> > Well, I somehow missed that requirement is to run *unmodified*
> > applications... I think it will be pretty hard to provide all the HW
> > infrastructure expected and UARTs as I know them have all possible
> > issues & workarounds.
> Hi Artem,
>
> The way I see this is not for Xen to provide support for any HW for any
> platform on all platforms.
>
> The way I see it is that on a given platform, for example the ZynqMP.
> You can run Xen as a partitioning Hypervisor essentially using device
> passthrough to assign various real HW devices to each VM.
>
> The various guests can run unmodified because they each see a subset
> of the platform.
>
> It is useful to have vuarts that go are shared into a single one.
To expand on the vuart, this is a small emulator to handle write from a 
guest. This was originally designed to handle DOM0 early console that is 
hardcoded on ARM32.
As mentioned by Artem, read would be more complex as it will mean 
per-UART emulator. IIRC, this would not be a problem for you, right?
Regards,

--
Julien Grall

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