Re: [Xen-devel] [PATCH v7b 00/25] dom0less step1: boot multiple domains from device tree

[Julien Grall <julien.grall@xxxxxxx>]

On 13/11/2018 17:51, Stefano Stabellini wrote:
> Hi all,
Hi Stefano,

> This is first step toward "dom0less" as discussed in the various
> certifications related threads and discussions.
>
> The goal of this series is to enable Xen to boot multiple domains in
> parallel, in addition to dom0, out of information found on device tree.
>
> The device tree based boot protocol is extended to carry information
> about DomUs. Based on that information, Xen creates and starts one or
> more DomUs. DomUs created this way don't have access to xenstore for the
> moment. This is actually OK, because this is meant for mission critical
> applications that typically only access directly assigned devices. They
> cannot tolerate interference or increased IRQ latency due to PV
> protocols. Device assignment is not actually covered by this series, it
> will be added later.
>
> DomUs can print to the Xen serial using the CONSOLEIO hypercalls. A
> virtual PL011 is also emulated for them so that they can use their
> regular PL011 driver. This allows unmodified guests to run as Xen on ARM
> guests -- no Xen support needed at all. Console input also comes from
> the Xen serial: the Ctrl-AAA switching mechanism is extended to switch
> among domUs, dom0, and Xen.
>
> In this version of the series, I reordered the patches to make sure they
> are all bisectable.
The series is now merged.

Cheers,


--
Julien Grall

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