Re: [Xen-devel] [PATCH v2 2/5] VMX/Viridian: suppress MSR-based APIC suggestion when having APIC-V

[George Dunlap <george.dunlap@xxxxxxxxxxxxx>]

On 06/25/2013 11:29 AM, Paul Durrant wrote:
> > -----Original Message-----
> > From: Jan Beulich [mailto:JBeulich@xxxxxxxx]
> > Sent: 24 June 2013 08:05
> > To: xen-devel
> > Cc: Paul Durrant; George Dunlap; Eddie Dong; Jun Nakajima; Yang Z Zhang;
> > Keir (Xen.org)
> > Subject: [PATCH v2 2/5] VMX/Viridian: suppress MSR-based APIC suggestion
> > when having APIC-V
> >
> > When the CPU has the necessary capabilities, having Windows use
> > synthetic MSR reads/writes is bogus, as this still requires emulation
> > (which is pretty much guaranteed to be slower than having the hardware
> > carry out the operation).
> >
> > Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
> Seems better just to not use the MSR in this case so I favour this patch over 
> #1, hence
>
> Ack-ed by: Paul Durrant <paul.durrant@xxxxxxxxxx>
This may push this over into the "#2 is probably a better idea" 
category; Paul, Yang, and Jan all think it's less intrusive.
Jan, I think it's your call -- You have an ack from me to put either #1 
or #2 in for 4.3 (but please not both).
 -George


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