File hw-arm-virt-Disable-pl011-clock-migratio.patch of Package qemu.19464
From: Gavin Shan <gshan@redhat.com>
Date: Thu, 18 Mar 2021 10:38:01 +0800
Subject: hw/arm/virt: Disable pl011 clock migration if needed
Git-commit: e6fa978d8343ec7cf20b9c8b2dcb390646242457
A clock is added by commit aac63e0e6ea3 ("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: aac63e0e6ea3 ("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>
Signed-off-by: Bruce Rogers <brogers@suse.com>
---
hw/char/pl011.c | 9 +++++++++
hw/core/machine.c | 1 +
include/hw/char/pl011.h | 1 +
3 files changed, 11 insertions(+)
diff --git a/hw/char/pl011.c b/hw/char/pl011.c
index ede16c781c9abcbeaf3ffb8f5c73..74cfa6cd663e397fdc4ba6d3bfe9 100644
--- a/hw/char/pl011.c
+++ b/hw/char/pl011.c
@@ -321,10 +321,18 @@ static const MemoryRegionOps pl011_ops = {
.endianness = DEVICE_NATIVE_ENDIAN,
};
+static bool pl011_clock_needed(void *opaque)
+{
+ PL011State *s = PL011(opaque);
+
+ return s->migrate_clk;
+}
+
static const VMStateDescription vmstate_pl011_clock = {
.name = "pl011/clock",
.version_id = 1,
.minimum_version_id = 1,
+ .needed = pl011_clock_needed,
.fields = (VMStateField[]) {
VMSTATE_CLOCK(clk, PL011State),
VMSTATE_END_OF_LIST()
@@ -362,6 +370,7 @@ static const VMStateDescription vmstate_pl011 = {
static Property pl011_properties[] = {
DEFINE_PROP_CHR("chardev", PL011State, chr),
+ DEFINE_PROP_BOOL("migrate-clk", PL011State, migrate_clk, true),
DEFINE_PROP_END_OF_LIST(),
};
diff --git a/hw/core/machine.c b/hw/core/machine.c
index 9e83400ecbfdd1c8ab20a54ff39c..72ceba57def38ca9dd5c683a71c4 100644
--- a/hw/core/machine.c
+++ b/hw/core/machine.c
@@ -36,6 +36,7 @@ GlobalProperty hw_compat_5_1[] = {
{ "virtio-scsi-device", "num_queues", "1"},
{ "nvme", "use-intel-id", "on"},
{ "pvpanic", "events", "1"}, /* PVPANIC_PANICKED */
+ { "pl011", "migrate-clk", "off" },
};
const size_t hw_compat_5_1_len = G_N_ELEMENTS(hw_compat_5_1);
diff --git a/include/hw/char/pl011.h b/include/hw/char/pl011.h
index 33e5e5317b82caaf39078a10b821..dc2c90eedca7b5f23d9db0c3a4ec 100644
--- a/include/hw/char/pl011.h
+++ b/include/hw/char/pl011.h
@@ -50,6 +50,7 @@ struct PL011State {
CharBackend chr;
qemu_irq irq[6];
Clock *clk;
+ bool migrate_clk;
const unsigned char *id;
};