From 537b7a705df795d888852b2cb4fbe535b4d534f4 Mon Sep 17 00:00:00 2001 From: Benjamin Herrenschmidt Date: Fri, 7 Jul 2017 16:08:40 -0500 Subject: cpu: Unconditionally cleanup TLBs on P9 in opal_reinit_cpus() This can work around problems where Linux fails to properly cleanup part or all of the TLB on kexec. Signed-off-by: Benjamin Herrenschmidt Signed-off-by: Stewart Smith --- core/cpu.c | 13 +++++++++++-- 1 file changed, 11 insertions(+), 2 deletions(-) diff --git a/core/cpu.c b/core/cpu.c index a0c395f..6c00bca 100644 --- a/core/cpu.c +++ b/core/cpu.c @@ -1191,12 +1191,21 @@ static int64_t opal_reinit_cpus(uint64_t flags) else req.clr_bits |= SPR_HID0_POWER9_RADIX; - cleanup_global_tlb(); current_radix_mode = radix; } } - /* Apply HID bits changes if any */ + /* Cleanup the TLB. We do that unconditionally, this works + * around issues where OSes fail to invalidate the PWC in Radix + * mode for example. This only works on P9 and later, but we + * also know we don't have a problem with Linux cleanups on + * P8 so this isn't a problem. If we wanted to cleanup the + * TLB on P8 as well, we'd have to use jobs to do it locally + * on each CPU. + */ + cleanup_global_tlb(); + + /* Apply HID bits changes if any */ if (req.set_bits || req.clr_bits) cpu_change_all_hid0(&req); -- cgit v1.1