On Tue, 07 Aug 2018 19:47:14 +0530
Mahesh J Salgaonkar <mah...@linux.vnet.ibm.com> wrote:
> From: Mahesh Salgaonkar <mah...@linux.vnet.ibm.com>
>
> On pseries, as of today system crashes if we get a machine check
> exceptions due to SLB errors. These are soft errors and can be fixed by
> flushing the SLBs so the kernel can continue to function instead of
> system crash. We do this in real mode before turning on MMU. Otherwise
> we would run into nested machine checks. This patch now fetches the
> rtas error log in real mode and flushes the SLBs on SLB errors.
>
> Signed-off-by: Mahesh Salgaonkar <mah...@linux.vnet.ibm.com>
> Signed-off-by: Michal Suchanek <msucha...@suse.com>
> ---
>
> Changes in V7:
> - Fold Michal's patch into this patch.
> - Handle MSR_RI=0 and evil context case in MC handler.
> ---
> diff --git a/arch/powerpc/mm/slb.c b/arch/powerpc/mm/slb.c
> index cb796724a6fc..e89f675f1b5e 100644
> --- a/arch/powerpc/mm/slb.c
> +++ b/arch/powerpc/mm/slb.c
> @@ -145,6 +145,12 @@ void slb_flush_and_rebolt(void)
> get_paca()->slb_cache_ptr = 0;
> }
>
> +void slb_flush_and_rebolt_realmode(void)
> +{
> + __slb_flush_and_rebolt();
> + get_paca()->slb_cache_ptr = 0;
> +}
> +
> void slb_vmalloc_update(void)
> {
> unsigned long vflags;
Can you use this patch for the SLB flush?
https://patchwork.ozlabs.org/patch/953034/
Thanks,
Nick
