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[PATCH] target/arm: Don't migrate CPUARMState.features

From: Aaron Lindsay
Subject: [PATCH] target/arm: Don't migrate CPUARMState.features
Date: Wed, 3 Feb 2021 11:13:40 -0500

As feature flags are added or removed, the meanings of bits in the
`features` field can change between QEMU versions, causing migration
failures. Additionally, migrating the field is not useful because it is
a constant function of the CPU being used.

Signed-off-by: Aaron Lindsay <aaron@os.amperecomputing.com>
Suggested-by: Peter Maydell <peter.maydell@linaro.org>
 target/arm/machine.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/target/arm/machine.c b/target/arm/machine.c
index c9e9fd0a12..7f2511b6ed 100644
--- a/target/arm/machine.c
+++ b/target/arm/machine.c
@@ -834,7 +834,7 @@ const VMStateDescription vmstate_arm_cpu = {
         VMSTATE_UINT64(env.exclusive_addr, ARMCPU),
         VMSTATE_UINT64(env.exclusive_val, ARMCPU),
         VMSTATE_UINT64(env.exclusive_high, ARMCPU),
-        VMSTATE_UINT64(env.features, ARMCPU),
+        VMSTATE_UNUSED(sizeof(uint64_t)),
         VMSTATE_UINT32(env.exception.syndrome, ARMCPU),
         VMSTATE_UINT32(env.exception.fsr, ARMCPU),
         VMSTATE_UINT64(env.exception.vaddress, ARMCPU),

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