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s390x/protvirt: allow to IPL secure guests with -no-reboot

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Right now, -no-reboot prevents secure guests from running. This is
correct from an implementation point of view, as we have modeled the
transition from non-secure to secure as a program directed IPL. From
a user perspective, this is not the behavior of least surprise.

We should implement the IPL into protected mode similar to the
functions that we use for kdump/kexec. In other words, we do not stop
here when -no-reboot is specified on the command line. Like function 0
or function 1, function 10 is not a classic reboot. For example, it
can only be called once. Before calling it a second time, a real
reboot/reset must happen in-between. So function code 10 is more or
less a state transition reset, but not a "standard" reset or reboot.

Fixes: 4d226deafc44 ("s390x: protvirt: Support unpack facility")
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Reviewed-by: Janosch Frank <frankja@linux.ibm.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Acked-by: Viktor Mihajlovski <mihajlov@linux.ibm.com>
Message-Id: <20200721103202.30610-1-borntraeger@de.ibm.com>
[CH: tweaked description]
Signed-off-by: Cornelia Huck <cohuck@redhat.com>
This commit is contained in:
Christian Borntraeger 2020-07-21 06:32:02 -04:00 committed by Cornelia Huck
parent 8ffa52c20d
commit d1bb69db4c
1 changed files with 2 additions and 1 deletions
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3
hw/s390x/ipl.c
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@ -630,7 +630,8 @@ void s390_ipl_reset_request(CPUState *cs, enum s390_reset reset_type)
}
}
if (reset_type == S390_RESET_MODIFIED_CLEAR ||
reset_type == S390_RESET_LOAD_NORMAL) {
reset_type == S390_RESET_LOAD_NORMAL ||
reset_type == S390_RESET_PV) {
/* ignore -no-reboot, send no event */
qemu_system_reset_request(SHUTDOWN_CAUSE_SUBSYSTEM_RESET);
} else {