Re: [Xen-devel] [PATCH v3 3/3] tools: introduce parameter max_wp_ram_ranges.

["Yu, Zhang" <yu.c.zhang@xxxxxxxxxxxxxxx>]

On 2/2/2016 6:32 PM, Jan Beulich wrote:
> > > > On 01.02.16 at 18:05, <Ian.Jackson@xxxxxxxxxxxxx> wrote:
> > Having said that, if the hypervisor maintainers are happy with a
> > situation where this value is configured explicitly, and the
> > configurations where a non-default value is required is expected to be
> > rare, then I guess we can live with it.
> Well, from the very beginning I have been not very happy with
> the introduction of this, and I still consider it half way acceptable
> only because of not seeing any good alternative. If we look at
> it strictly, it's in violation of the rule we set forth after XSA-77:
> No introduction of new code making the system susceptible to
> bad (malicious) tool stack behavior, and hence we should reject
> it. Yet that would leave XenGT in a state where it would have no
> perspective of ever getting merged, which doesn't seem very
> desirable either.
>
> Jan
Thanks, Jan.
I understand your concern, and to be honest, I do not think
this is an optimal solution. But I also have no better idea
in mind.  :(
Another option may be: instead of opening this parameter to
the tool stack, we use a XenGT flag, which set the rangeset
limit to a default value. But like I said, this default value
may not always work on future XenGT platforms.


B.R.
Yu

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