Re: [Embedded-pv-devel] [Xen-devel] [RFC] Shared coprocessor framework

[Artem Mygaiev <joculator@xxxxxxxxx>]

On Fri, Nov 11, 2016 at 10:43 PM, Konrad Rzeszutek Wilk
<konrad.wilk@xxxxxxxxxx> wrote:
> Does this also mean that the hypervisor has to know the co-processors?
> As in how to start/stop them? And how to tell them to save/restore
> guest context? Or is there some generic specification for doing this?

Unfortunately there is be no single way to switch context on
co-processors, so yes, hypervisor has to know the co-processors.
The situation is not as bad as having full-scope driver (which is
implemented in some proprietary hypervisors), we only need to:
1. stop
2. flush registers
3. switch memory context <--- implemented by SMMU in ARM
4. restore registers
5. start

Best regards,
Artem Mygaiev

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