On 08/08/2018 02:34 PM, Nicholas Piggin wrote: > 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/
Will use your v2. Thanks, -Mahesh. > > Thanks, > Nick >