Re: [Qemu-devel] KVM Forum block no[td]es

[Max Reitz]

On 16.11.18 16:18, Kevin Wolf wrote:
> Am 16.11.2018 um 16:03 hat Alberto Garcia geschrieben:
>>> I don't think anything needs a way to generally block graph changes
>>> around some node.  We only need to prevent changes to very specific
>>> sets of edges.  This is something that the permission system just
>>> cannot do.
>>
>> But what would you do then?
> 
> I agree with you mostly in that I think that most problems that Max
> mentioned aren't readl. The only real problem I see with GRAPH_MOD as a
> permission on the node level is this overblocking

I wholeheartedly disagree.  Yes, it is true that most of the issues I
thought of can be fixed, and so those problems are not problems in a
technical sense.  But to me this whole discussion points to the greatest
issue I have, which is that GRAPH_MOD is just too complicated to
understand.  And I don't like a solution that works on a technical level
but that everybody is too afraid to touch because it's too weird.

We have this discussion again and again, and in the end we always come
up with something that looks like it might work, but it's just so weird
that we can't even remember it.

Maybe it's just me, though.  Frankly, I think the permission system
itself is already too complicated as it is, but I don't have a simpler
solution there.

Max

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