From: Heiko Carstens <hca@linux.ibm.com>
Date: Tue, 28 Feb 2023 12:57:47 +0000 (+0100)
Subject: s390/bp: add missing BPENTER to program check handler
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=fed626db8bc240678fd0fa8078aa767ad21d47fd;p=linux.git

s390/bp: add missing BPENTER to program check handler

When leaving interpretive execution because of a program check BPENTER
should be called like it is done on interrupt exit as well.

Acked-by: Alexander Gordeev <agordeev@linux.ibm.com>
Reviewed-by: Sven Schnelle <svens@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
---

diff --git a/arch/s390/kernel/entry.S b/arch/s390/kernel/entry.S
index 76a06f3d36711..2af5d7602ae88 100644
--- a/arch/s390/kernel/entry.S
+++ b/arch/s390/kernel/entry.S
@@ -355,6 +355,7 @@ ENTRY(pgm_check_handler)
 #if IS_ENABLED(CONFIG_KVM)
 	# cleanup critical section for program checks in __sie64a
 	OUTSIDE	%r9,.Lsie_gmap,.Lsie_done,1f
+	BPENTER	__SF_SIE_FLAGS(%r15),(_TIF_ISOLATE_BP|_TIF_ISOLATE_BP_GUEST)
 	SIEEXIT
 	lghi	%r10,_PIF_GUEST_FAULT
 #endif