Re: [Xen-devel] [PATCH v2 4/6] x86: bring up all CPUs even if not all are supposed to be used

[Roger Pau Monné <roger.pau@xxxxxxxxxx>]

On Wed, Jul 18, 2018 at 02:21:53AM -0600, Jan Beulich wrote:
> Reportedly Intel CPUs which can't broadcast #MC to all targeted
> cores/threads because some have CR4.MCE clear will shut down. Therefore
> we want to keep CR4.MCE enabled when offlining a CPU, and we need to
> bring up all CPUs in order to be able to set CR4.MCE in the first place.
> 
> The use of clear_in_cr4() in cpu_mcheck_disable() was ill advised
> anyway, and to avoid future similar mistakes I'm removing clear_in_cr4()
> altogether right here.
> 
> Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>

Reviewed-by: Roger Pau Monné <roger.pau@xxxxxxxxxx>

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