Re: [Xen-devel] [PATCH v16 01/10] x86: add generic resource (e.g. MSR) access hypercall

[Chao Peng <chao.p.peng@xxxxxxxxxxxxxxx>]

On Fri, Sep 26, 2014 at 09:28:21AM +0100, Jan Beulich wrote:
> >>> On 25.09.14 at 21:57, <andrew.cooper3@xxxxxxxxxx> wrote:
> > On a different note, you need to enforce a maximum resource_op.nr of
> > something rather low to (16/32 perhaps?) to prevent a toolstack asking
> > for 0xffffffff non-preemptible operations.
> 
> I'd start out as low as we can, i.e. right now just 2 (write followed
> by read). Any increase of the threshold will then need proper (and
> trackable) reasoning.
Agree, especially when we have xmalloc() here.
> 
> Jan

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