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pseries: Fix compat_pvr on reset

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If we a migrate P8 machine to a P9 machine, the migration fails on
destination with:

  error while loading state for instance 0x1 of device 'cpu'
  load of migration failed: Operation not permitted

This is caused because the compat_pvr field is only present for the first
CPU.
Originally, spapr_machine_reset() calls ppc_set_compat() to set the value
max_compat_pvr for the first cpu and this was propagated to all CPUs by
spapr_cpu_reset().  Now, as spapr_cpu_reset() is called before that, the
value is not propagated to all CPUs and the migration fails.

To fix that, propagate the new value to all CPUs in spapr_machine_reset().

Fixes: 25c9780d38 ("spapr: Reset CAS & IRQ subsystem after devices")
Signed-off-by: Laurent Vivier <lvivier@redhat.com>
Message-Id: <20190826090812.19080-1-lvivier@redhat.com>
Reviewed-by: Greg Kurz <groug@kaod.org>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
This commit is contained in:
Laurent Vivier 2019-08-26 11:08:12 +02:00 • committed by David Gibson
parent 02a1536eee
commit ce03a193e1
2 changed files with 9 additions and 1 deletions
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2
hw/ppc/spapr_cpu_core.c
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@ -43,6 +43,8 @@ static void spapr_cpu_reset(void *opaque)
/* Set compatibility mode to match the boot CPU, which was either set
* by the machine reset code or by CAS. This should never fail.
* At startup the value is already set for all the CPUs
* but we need this when we hotplug a new CPU
*/
ppc_set_compat(cpu, POWERPC_CPU(first_cpu)->compat_pvr, &error_abort);