Re: [Xen-devel] [RFC PATCH 0/5] Add hypervisor sysfs-like support

[Jan Beulich <jbeulich@xxxxxxxx>]

On 11.09.2019 08:19, Juergen Gross wrote:
> On the 2019 Xen developer summit there was agreement that the Xen
> hypervisor should gain support for a hierarchical name-value store
> similar to the Linux kernel's sysfs.
> 
> This is a first implementation of that idea adding the basic
> functionality to hypervisor and tools side. The interface to any
> user program making use of that "xen-sysfs" is a new library
> "libxenfs" with a stable interface.
> 
> There are still some pending questions, those are:
> 
> - access rights:
>   + should we allow access to dom0 only, or to all domains, or should
>     that be possible to set per entry?

Dom0 only for now, I'd say. But if possible don't put in road blocks
making relaxing this more difficult.

>   + how to integrate with xsm?

When Dom0 only, perhaps not needed more than wiring this through the
same hook as e.g. the sysctl-s use?

> - dynamical entries:
>   + do we want support for e.g. per-domain and/or per-cpupool entries?

Down the road - perhaps.

>   + do we want support for debug aids (lock-profiling, debugtrace ..)?

Seeing you introduce a file system abstraction, have such go through
a debugfs-like one?

> - write access:
>   + runtime parameters?
>   + debugging aids?

For both - down the road, perhaps.

Jan

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