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

[Gianluca Guida <glguida@xxxxxxxxxxxx>]

On Fri, Sep 07, 2012 at 04:51:15PM +0100, Ian Campbell wrote:
> 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:
> > >> > 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 ;-)

There is in 4.2 an HVM op to generate MSIs from emulated devices, added
at changeset 23413.
The passthrough part was already present before.

Thanks,
Gianluca

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