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 16:22 +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)?

> 
> > vMCE: Forward MCE (Machine Check Exceptions) to guests
> >         New in 4.2? Preview or complete? I know improvements are pending
> >         to migration in 4.3.
> 
> Should be in reasonable state; certainly not a preview.

Thanks.

> > AMD OSVW: What is this?
> >         Seems to be new in 4.2?
> 
> OS Visible Workaround. A little bit of virtualization of this for
> HVM guests got added. Nothing end user visible though.
> 
> > Intel HLE: What is this?
> >         Seems to be new in 4.2?
> 
> Something like "Hardware Lock Elision".
> 
> I don't think there's any support for this, just white-listing the
> feature for (HVM) guests.
> 
> > Intel TRM: What is this?
> >         Seems to be new in 4.2?
> 
> "Restricted Transactional Memory"
> 
> Implementation-wise same as above.

OK. I don't think "expose an underlying hardware feature to guests" is
very interesting from a feature list PoV so I'll omit both of these.

> 
> > OVMF support for HVM guests.
> >         New in 4.2, but disabled by default => Tech preview?
> 
> Wasn't it that this doesn't even build?

Something like that. Or maybe only with certain compilers or something.
Unless Atillio says otherwise I'll mark it as a preview.

> 
> > 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?

Thanks!
Ian.



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