s390x: create persistent comm-key

To decrypt the dump of a PV guest, the comm-key (CCK) is required. Until
now, no comm-key was provided to genprotimg, therefore decrypting the
dump of a kvm-unit-test under PV was not possible.

This patch makes sure that we create a random CCK if there's no
$(TEST_DIR)/comm.key file.

Also allow dumping of PV tests by passing the appropriate PCF to
genprotimg (bit 34). --x-pcf is used to be compatible with older
genprotimg versions, which don't support --enable-dump. 0xe0 is the
default PCF value and only bit 34 is added.

Unfortunately, recent versions of genprotimg removed the --x-comm-key
argument which was used by older versions to specify the CCK. To support
these versions, we need to parse the genprotimg help output and decide
which argument to use.

Signed-off-by: Nico Boehr <nrb@linux.ibm.com>
Reviewed-by: Janosch Frank <frankja@linux.ibm.com>
Link: https://lore.kernel.org/r/20220909121453.202548-3-nrb@linux.ibm.com


Message-Id: <20220909121453.202548-3-nrb@linux.ibm.com>
Signed-off-by: Janosch Frank <frankja@linux.ibm.com>