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authorHeiko Carstens <heiko.carstens@de.ibm.com>2017-08-03 13:05:11 +0200
committerChristian Borntraeger <borntraeger@de.ibm.com>2017-08-21 15:34:36 +0200
commit4a4eefcd0e49f9f339933324c1bde431186a0a7d (patch)
treebd3d10884a4e173722dfad4099f4e20adb66c68e /arch
parent4f899147424a189b0ad1fdd6f35784ed5a642e83 (diff)
KVM: s390: sthyi: fix sthyi inline assembly
The sthyi inline assembly misses register r3 within the clobber list. The sthyi instruction will always write a return code to register "R2+1", which in this case would be r3. Due to that we may have register corruption and see host crashes or data corruption depending on how gcc decided to allocate and use registers during compile time. Fixes: 95ca2cb57985 ("KVM: s390: Add sthyi emulation") Cc: <stable@vger.kernel.org> # 4.8+ Reviewed-by: Janosch Frank <frankja@linux.vnet.ibm.com> Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Reviewed-by: David Hildenbrand <david@redhat.com> Reviewed-by: Cornelia Huck <cohuck@redhat.com> Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Diffstat (limited to 'arch')
-rw-r--r--arch/s390/kvm/sthyi.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/s390/kvm/sthyi.c b/arch/s390/kvm/sthyi.c
index 926b5244263e..2773a2f6a5c4 100644
--- a/arch/s390/kvm/sthyi.c
+++ b/arch/s390/kvm/sthyi.c
@@ -394,7 +394,7 @@ static int sthyi(u64 vaddr)
"srl %[cc],28\n"
: [cc] "=d" (cc)
: [code] "d" (code), [addr] "a" (addr)
- : "memory", "cc");
+ : "3", "memory", "cc");
return cc;
}