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+
+qemu-system-ppc64 smp crash on manual reset
+
+Host Environment:
+   x86_64 Linux v5.0.2
+   QEMU emulator version 4.0.50 (v4.0.0-354-g812b835fb4)
+   SLOF:
+       Build Date = Jan 14 2019 18:00:39
+       FW Version = git-a5b428e1c1eae703
+
+Problem: Qemu crash immediately after a manual reset
+         (this is not the initial reset which launches the guest).
+
+Steps:
+
+1. Download Debian ppc64el mini.iso:
+   http://ftp.debian.org/debian/dists/sid/main/installer-ppc64el/current/images/netboot/mini.iso
+2. Run qemu on the host. Ensure that it runs with more than one CPUs. With a single CPU, I was unable
+   to reproduce the crash.
+   qemu-system-ppc64 -M pseries -cpu power9 -smp 2 -m 512 -cdrom mini.iso
+3. SLOF prints the version info on the serial device, and proceeds to boot.
+4. After a few seconds, the GRUB menu appears on the VGA screen.
+5. Select one of the install options (I have tested with Default and Expert), and wait
+   for the Debian's text-mode installer (blue-gray-red) screen to appear.
+6. Click Machine->Reset (or enter system_reset on the qemu monitor).
+7. Notice that, on the serial device, SLOF has printed the version info. That is, the system
+   has reset and is attempting to boot again.
+8. On the host cmd prompt, qemu dies after printing this fatal error and spewing the
+   contents of the CPU registers:
+
+   qemu: fatal: Trying to deliver HV exception (MSR) 70 with no HV support
+   <CPU contents> (See attached out.txt for details)
+   Aborted (core dumped)
+
+
+The HV exception is either
+   (a) 70 = HISI, which occurs when NIP contains an outright bogus or inaccessible value, or
+   (b) 69 = HDSI, which occurs when NIP happens to contain a somewhat saner value, and
+       the cpu attempts to run the instruction at that address.
+
+The exception can occur on either of the CPUs. It occurs when qemu is running the SLOF
+code.
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