Re: pvops microcode support for AMD FAM >= 15

[Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>]

On Thu, Dec 06, 2012 at 08:34:31AM +0000, Ian Campbell wrote:
> (trim quote please...)
> On Wed, 2012-12-05 at 21:47 +0000, Konrad Rzeszutek Wilk wrote:
> > Do you want to prep a patch that I can stick in my 'microcode' branch?
> > .. That I will at some point try to upstream.
> 
> You might want to look back at the archives when Jeremy first tried to
> upstream this work, it was a vehement "No" and the resulting thread was
> not pretty.
> 
> Now that we have early loading via the hypervisor in 4.2 and Linux is
> finally in the process of growing its own early microcode loading
> solution I suspect the No would be even firmer.
> 
> It is on xenbits if you want it anyway:
> 
> git://xenbits.xen.org/people/ianc/linux-2.6.git debian/wheezy/microcode

Thx. Pulled it in my stable/misc branch.
> 
> About the only argument I can see for continuing to try upstreaming this
> stuff is that in
> http://www.gossamer-threads.com/lists/linux/kernel/1583630 Fenghua says:
> 
>         Note, however, that Linux users have gotten used to being able
>         to install a microcode patch in the field without having a
>         reboot; we support that model too.
> 
> i.e. this is an argument for keeping the previous scheme in parallel,
> which I suppose is an argument for supporting the same under Xen (I
> don't know if its a good one though.
> 
> Ian.
> 
> -- 
> Ian Campbell
> 
> 
> All the existing 2.0.x kernels are to buggy for 2.1.x to be the
> main goal.
> 		-- Alan Cox
>