[v2 09/12] powerpc/mce: Enable MCE notifiers in external modules

[Nicholas Piggin]

Santosh Sivaraj's on July 2, 2019 3:19 pm:
> From: Reza Arbab <arbab at linux.ibm.com>
> 
> Signed-off-by: Reza Arbab <arbab at linux.ibm.com>
> ---
>  arch/powerpc/kernel/exceptions-64s.S | 6 ++++++
>  arch/powerpc/kernel/mce.c            | 2 ++
>  2 files changed, 8 insertions(+)
> 
> diff --git a/arch/powerpc/kernel/exceptions-64s.S b/arch/powerpc/kernel/exceptions-64s.S
> index c83e38a403fd..311f1392a2ec 100644
> --- a/arch/powerpc/kernel/exceptions-64s.S
> +++ b/arch/powerpc/kernel/exceptions-64s.S
> @@ -458,6 +458,12 @@ EXC_COMMON_BEGIN(machine_check_handle_early)
>  	bl	machine_check_early
>  	std	r3,RESULT(r1)	/* Save result */
>  
> +	/* Notifiers may be in a module, so enable virtual addressing. */
> +	mfmsr	r11
> +	ori	r11,r11,MSR_IR
> +	ori	r11,r11,MSR_DR
> +	mtmsr	r11

Can't do this, we could take a machine check somewhere the MMU is
not sane (in fact the guest early mce handling that was added recently
should not be enabling virtual mode either, which needs to be fixed).

Thanks,
Nick