[PATCH] Don't access HID registers if running on a Hypervisor.

[Jimi Xenidis]

On Jun 21, 2006, at 7:58 PM, Paul Mackerras wrote:

> Jimi Xenidis writes:
>
>> The following patch avoids accessing Hypervisor privilege HID
>> registers when running on a Hypervisor (MSR[HV]=0).
>
> Why?  Aren't the writes defined to be no-ops when not in hypervisor
> mode?

The write are no-ops but look at the instructions required to be  
around the write for some of them.
I believe read may have performance issues as well.

I juts think its good practice and as Xell and newer processes come  
along we may want to start using the PACA(?) rather then peeking at  
the msr all the time.

-JX