diff options
| author | Philipp Kern <phil@philkern.de> | 2015-08-18 13:50:55 +0200 |
|---|---|---|
| committer | Michael Roth <mdroth@linux.vnet.ibm.com> | 2017-08-31 11:21:20 -0500 |
| commit | c152efc943d4e3a1aa2986d7388b89b87cc59520 (patch) | |
| tree | 882cc0aed547a4705834aa2f23cd79cf15feb3b8 | |
| parent | 077a67e929b083704d265eb883aa84a368f4ad4a (diff) | |
| download | qemu-c152efc943d4e3a1aa2986d7388b89b87cc59520.tar.gz | |
target-s390x: Mask the SIGP order_code to 8bit.
According to "CPU Signaling and Response", "Signal-Processor Orders",
the order field is bit position 56-63. Without this, the Linux
guest kernel is sometimes unable to stop emulation and enters
an infinite loop of "XXX unknown sigp: 0xffffffff00000005".
Signed-off-by: Philipp Kern <phil@philkern.de>
Reviewed-by: Thomas Huth <thuth@tuxfamily.org>
[agraf: add comment according to email]
Signed-off-by: Alexander Graf <agraf@suse.de>
(cherry picked from commit 601b9a9008c5a612d76073bb3f178621cff41980)
Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
| -rw-r--r-- | target/s390x/misc_helper.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/target/s390x/misc_helper.c b/target/s390x/misc_helper.c index 93b0e61366..83d38944d7 100644 --- a/target/s390x/misc_helper.c +++ b/target/s390x/misc_helper.c @@ -515,7 +515,8 @@ uint32_t HELPER(sigp)(CPUS390XState *env, uint64_t order_code, uint32_t r1, /* Remember: Use "R1 or R1 + 1, whichever is the odd-numbered register" as parameter (input). Status (output) is always R1. */ - switch (order_code) { + /* sigp contains the order code in bit positions 56-63, mask it here. */ + switch (order_code & 0xff) { case SIGP_SET_ARCH: /* switch arch */ break; |