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authorLinus Torvalds <torvalds@linux-foundation.org>2017-10-27 20:32:24 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2017-10-27 20:32:24 -0700
commitfe23429e6bfec817abcf316f4782aed8426ea745 (patch)
tree097c9cb40381934d674d05927b95f15cb5d7d629
parentd3eab75a7fdd32b4b9c342a07be3525c4d31a41a (diff)
parent0a5e2ec2647737907d267c09dc9a25fab1468865 (diff)
downloadlinux-stericsson-fe23429e6bfec817abcf316f4782aed8426ea745.tar.gz
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux
Pull s390 fix from Martin Schwidefsky: "A fix for a regression in regard to machine check handling in KVM. Keeping my fingers crossed that this is the last s390 fix for v4.14" * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux: s390/kvm: fix detection of guest machine checks
-rw-r--r--arch/s390/kernel/entry.S7
1 files changed, 5 insertions, 2 deletions
diff --git a/arch/s390/kernel/entry.S b/arch/s390/kernel/entry.S
index 21900e1cee9c..d185aa3965bf 100644
--- a/arch/s390/kernel/entry.S
+++ b/arch/s390/kernel/entry.S
@@ -521,12 +521,15 @@ ENTRY(pgm_check_handler)
tmhh %r8,0x0001 # test problem state bit
jnz 2f # -> fault in user space
#if IS_ENABLED(CONFIG_KVM)
- # cleanup critical section for sie64a
+ # cleanup critical section for program checks in sie64a
lgr %r14,%r9
slg %r14,BASED(.Lsie_critical_start)
clg %r14,BASED(.Lsie_critical_length)
jhe 0f
- brasl %r14,.Lcleanup_sie
+ lg %r14,__SF_EMPTY(%r15) # get control block pointer
+ ni __SIE_PROG0C+3(%r14),0xfe # no longer in SIE
+ lctlg %c1,%c1,__LC_USER_ASCE # load primary asce
+ larl %r9,sie_exit # skip forward to sie_exit
#endif
0: tmhh %r8,0x4000 # PER bit set in old PSW ?
jnz 1f # -> enabled, can't be a double fault