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

[Juergen Gross <jgross@suse.com>]

On 11.09.19 11:24, Jan Beulich wrote:
> 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.

Sure.

> 
>>    + 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?

Yes, or adding another hook for that purpose.

> 
>> - 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?

Well, I was more thinking of a "debug" directory for that purpose.

> 
>> - write access:
>>    + runtime parameters?
>>    + debugging aids?
> 
> For both - down the road, perhaps.

Okay.

Thanks for the feedback,


Juergen


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