Re: [Xen-devel] [PATCH v11 3/9] tools: provide interface for generic MSR access

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 20.06.14 at 19:34, <konrad.wilk@xxxxxxxxxx> wrote:
> On Fri, Jun 20, 2014 at 10:31:44PM +0800, Dongxiao Xu wrote:
>> Xen added a new sysctl hypercall for generic MSR access, and this is the
>> tool side change to wrapper the hypercall into xc APIs.
> 
> I really like the idea that Jan surfaced. That is use an
> cpu bitmap for the operation (see xc_tbuf.c as an example)
> and my recent postings http://osdir.com/ml/general/2014-06/msg24386.html.
> 
> That way you can define exactly which CPUs you want to do it
> at and you can do one nice hypercall that will do it all at
> once for you.

CPU bitmap? Me? I don't think I ever suggested anything like that,
not the least because it would become problematic where to store
the data (would need to be either [potentially very] sparse arrays,
or need a complicated [or at least ugly] mechanism for each CPU to
find its slot).

Jan


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