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

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 25.06.13 at 15:43, George Dunlap <george.dunlap@xxxxxxxxxxxxx> wrote:
> 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).

So I pushed this one, considering the above and the lack of an
ack for #1.

Jan


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