Re: [Xen-devel] [Patch v2] x86/boot: Use mov to cr0 in preference to lmsw

[Keir Fraser <keir.xen@xxxxxxxxx>]

On 28/08/2013 11:36, "Andrew Cooper" <andrew.cooper3@xxxxxxxxxx> wrote:

> lmsw is for compability for 286 processors only, and any more modern
> processors are recomended to use mov to cr0.  Xen has never been capable of
> booting on a 286, given its multiboot entry.
> 
> Furthermore, this avoids needless playing with the MP, EM and TS bits.  These
> do get explicitly chosen slightly later on boot.
> 
> Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
> CC: Keir Fraser <keir@xxxxxxx>
> CC: Jan Beulich <JBeulich@xxxxxxxx>

I don't know. This seems quite pointless.



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