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

[Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>]

On Mon, Jun 23, 2014 at 08:13:10AM +0100, Jan Beulich wrote:
> >>> On 20.06.14 at 19:34, <konrad.wilk@oracle.com> 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).

I am sorry for the assumption. In that case lets drop that idea.

> 
> Jan
>