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arm/kvm: add support for MTE

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Extend the 'mte' property for the virt machine to cover KVM as
well. For KVM, we don't allocate tag memory, but instead enable the
capability.

If MTE has been enabled, we need to disable migration, as we do not
yet have a way to migrate the tags as well. Therefore, MTE will stay
off with KVM unless requested explicitly.

Signed-off-by: Cornelia Huck <cohuck@redhat.com>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20230428095533.21747-2-cohuck@redhat.com
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Cornelia Huck 2023-04-28 11:55:33 +02:00 • committed by Peter Maydell
parent 96e6d25fdd
commit b320e21c48
6 changed files with 109 additions and 36 deletions
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9
target/arm/cpu.c
View file

@ -1480,6 +1480,7 @@ void arm_cpu_post_init(Object *obj)
qdev_prop_allow_set_link_before_realize,
OBJ_PROP_LINK_STRONG);
}
cpu->has_mte = true;
}
#endif
}
@ -1616,7 +1617,7 @@ static void arm_cpu_realizefn(DeviceState *dev, Error **errp)
}
if (cpu->tag_memory) {
error_setg(errp,
"Cannot enable %s when guest CPUs has MTE enabled",
"Cannot enable %s when guest CPUs has tag memory enabled",
current_accel_name());
return;
}
@ -1996,10 +1997,10 @@ static void arm_cpu_realizefn(DeviceState *dev, Error **errp)
}
#ifndef CONFIG_USER_ONLY
if (cpu->tag_memory == NULL && cpu_isar_feature(aa64_mte, cpu)) {
if (!cpu->has_mte && cpu_isar_feature(aa64_mte, cpu)) {
/*
* Disable the MTE feature bits if we do not have tag-memory
* provided by the machine.
* Disable the MTE feature bits if we do not have the feature
* setup by the machine.
*/
cpu->isar.id_aa64pfr1 =
FIELD_DP64(cpu->isar.id_aa64pfr1, ID_AA64PFR1, MTE, 0);