Re: [Xen-devel] Xen 4.2 new features and status -- please help me make a list

[Ian Campbell <Ian.Campbell@xxxxxxxxxx>]

On Fri, 2012-09-07 at 16:49 +0100, Jan Beulich wrote:
> >>> On 07.09.12 at 17:39, Ian Campbell <Ian.Campbell@xxxxxxxxxx> wrote:
> > On Fri, 2012-09-07 at 16:22 +0100, Jan Beulich wrote:
> >> >>> On 07.09.12 at 16:14, Ian Campbell <Ian.Campbell@xxxxxxxxxx> wrote:
> >> > vMSI: ? Emulated (or real?) MSIs for guests?
> >> >         State? New in 4.2?
> >> 
> >> Not sure what you're referring to here. There certainly was a
> >> xen/arch/x86/hvm/vmsi.c in 4.1 already.
> > 
> > OK, thanks. 4.0 too by the looks of it.
> > 
> > What exactly is this? Is it about injection of MSIs from real
> > (passthrough) hardware devices to guests (only HVM ones?) or is about
> > MSIs generated by emulated devices (or both)?
> 
> I don't think emulated devices genera MSIs, so to me this is
> just for passthrough. But I may be wrong.

It sounds plausible to me ;-)

> 
> >> > vPMU: Power Management?
> >> >         New in 4.2?
> >> 
> >> Enhanced iirc.
> > 
> > But already a full feature in 4.1 and 4.0?
> > 
> > This lets HVM guests thing they have power management hardware, and
> > tickling it does what?
> 
> Oh, I didn't pay close enough attention - PM stands for
> Performance Monitor here. Iirc e.g. Fujitsu have been using
> this even in 4.0 already.

perf monitoring makes more sense as a guest accessible thing.

Ian.


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