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hw/arm/virt: Disable pl011 clock migration if needed

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A clock is added by commit aac63e0e6e ("hw/char/pl011: add a clock
input") since v5.2.0 which corresponds to virt-5.2 machine type. It
causes backwards migration failure from upstream to downstream (v5.1.0)
when the machine type is specified with virt-5.1.

This fixes the issue by following instructions from section "Connecting
subsections to properties" in docs/devel/migration.rst. With this applied,
the PL011 clock is migrated based on the machine type.

   virt-5.2 or newer:  migration
   virt-5.1 or older:  non-migration

Cc: qemu-stable@nongnu.org # v5.2.0+
Fixes: aac63e0e6e ("hw/char/pl011: add a clock input")
Suggested-by: Andrew Jones <drjones@redhat.com>
Signed-off-by: Gavin Shan <gshan@redhat.com>
Reviewed-by: Andrew Jones <drjones@redhat.com>
Message-id: 20210318023801.18287-1-gshan@redhat.com
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Gavin Shan 2021-03-18 10:38:01 +08:00 • committed by Peter Maydell
parent 5ca634afcf
commit e6fa978d83
3 changed files with 11 additions and 0 deletions
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1
include/hw/char/pl011.h
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@ -50,6 +50,7 @@ struct PL011State {
CharBackend chr;
qemu_irq irq[6];
Clock *clk;
bool migrate_clk;
const unsigned char *id;
};