Re: [Qemu-devel] [PATCH] target-s390x: Mask the SIGP order_code to 8bit.

[Alexander Graf]

On 20.08.15 19:16, Thomas Huth wrote:
> On 18/08/15 04:50, Philipp Kern wrote:
>> 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 <address@hidden>
>> ---
>>  target-s390x/misc_helper.c | 2 +-
>>  1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/target-s390x/misc_helper.c b/target-s390x/misc_helper.c
>> index 8eac0e1..0f0907c 100644
>> --- a/target-s390x/misc_helper.c
>> +++ b/target-s390x/misc_helper.c
>> @@ -500,7 +500,7 @@ 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) {
>> +    switch (order_code & 0xff) {
>>      case SIGP_SET_ARCH:
>>          /* switch arch */
>>          break;
> 
> Reviewed-by: Thomas Huth <address@hidden>

Thanks, applied to s390-next.


Alex