Re: [Xen-devel] pvops microcode support for AMD FAM >= 15

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 06.12.12 at 09:34, Ian Campbell <ijc@xxxxxxxxxxxxxx> 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
> 
> 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.

Another counter argument would be that the kernel really is
only relaying things in the Xen case. Which means the user
mode tool could as well interface with Xen directly.

Jan


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