Re: [PATCH v3 3/5] x86/microcode: Avoid any chance of MCE's during microcode update

[Ingo Molnar <mingo@kernel.org>]

* Ingo Molnar <mingo@kernel.org> wrote:

> > +void mce_set_mcip(void)
> > +{
> > +	mce_wrmsrl(MSR_IA32_MCG_STATUS, 0x1);
> > +}
> > +
> > +void mce_clear_mcip(void)
> > +{
> > +	mce_wrmsrl(MSR_IA32_MCG_STATUS, 0x0);
> > +}
> 
> Instead of naming new APIs after how they are doing stuff, please name them 
> after *what* they are doing at the highest level: they disable/enable MCEs.
> 
> Ie. I'd suggest something like:
> 
>      mce_disable()
>      mce_enable()
> 
> I'd also suggest to at minimum add a WARN_ON_ONCE() if MSR_IA32_MCG_STATUS 
> is already 1 when we disable it - because whoever wanted it disabled will 
> now be surprised by us enabling them again.

Also, Boris tells me that writing 0x0 to MSR_IA32_MCG_STATUS apparently 
shuts the platform down - which is not ideal...

Thanks,

	Ingo