[kvm-unit-tests PATCH v5 0/2] Fixing infinite loop on SCLP READ SCP INFO error

[Pierre Morel <pmorel@linux.ibm.com>]

Aborting on SCLP READ SCP INFO error leads to a deadloop.

The loop is:
abort() -> exit() -> smp_teardown() -> smp_query_num_cpus() ->
sclp_get_cpu_num() -> assert() -> abort()

Since smp_setup() is done after sclp_read_info() inside setup() this
loop only happens when only the start processor is running.
Let sclp_get_cpu_num() return 1 in this case.

Also provide a bigger buffer for SCLP READ INFO when we have the
extended-length-SCCB facility.

Pierre

Pierre Morel (2):
  s390x: sclp: treat system as single processor when read_info is NULL
  s390x: sclp: Implement extended-length-SCCB facility

 lib/s390x/sclp.c | 16 +++++++++++++---
 1 file changed, 13 insertions(+), 3 deletions(-)

-- 
2.31.1

since v4:

- changed comments
  (Nico)

- use a big buffer from the start if possible
  (Claudio)

since v3:

- added initial patch and merge with comments
  Sorry for the noise.

since v2:

- use tabs in first patch
  (Nico)

- Added comments

- Added SCLP_RC_INSUFFICIENT_SCCB_LENGTH handling