From 64c3431808bdab2ccef97d7a444018c416b080b5 Mon Sep 17 00:00:00 2001 From: Sven Schnelle Date: Wed, 13 Mar 2024 09:51:22 +0100 Subject: s390/entry: compare gmap asce to determine guest/host fault With the current implementation, there are some cornercases where a host fault would be treated as a guest fault, for example when the sie instruction causes a program check. Therefore store the gmap asce in ptregs, and use that to compare the primary asce from the fault instead of matching instruction addresses. Suggested-by: Heiko Carstens Signed-off-by: Sven Schnelle Signed-off-by: Heiko Carstens --- arch/s390/mm/fault.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) (limited to 'arch/s390/mm/fault.c') diff --git a/arch/s390/mm/fault.c b/arch/s390/mm/fault.c index ac4c78546d97..c421dd44ffbe 100644 --- a/arch/s390/mm/fault.c +++ b/arch/s390/mm/fault.c @@ -67,13 +67,15 @@ early_initcall(fault_init); static enum fault_type get_fault_type(struct pt_regs *regs) { union teid teid = { .val = regs->int_parm_long }; + struct gmap *gmap; if (likely(teid.as == PSW_BITS_AS_PRIMARY)) { if (user_mode(regs)) return USER_FAULT; if (!IS_ENABLED(CONFIG_PGSTE)) return KERNEL_FAULT; - if (test_pt_regs_flag(regs, PIF_GUEST_FAULT)) + gmap = (struct gmap *)S390_lowcore.gmap; + if (regs->cr1 == gmap->asce) return GMAP_FAULT; return KERNEL_FAULT; } -- cgit v1.2.3