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hw/arm/virt: Support -machine gic-version=max 

Add support for passing 'max' to -machine gic-version. By analogy
with the -cpu max option, this picks the "best available" GIC version
whether you're using KVM or TCG, so it behaves like 'host' when
using KVM, and gives you GICv3 when using TCG.

Also like '-cpu host', using -machine gic-version=max' means there
is no guarantee of migration compatibility between QEMU versions;
in future 'max' might mean '4'.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Message-id: 20180308130626.12393-7-peter.maydell@linaro.org
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
This commit is contained in:
Peter Maydell 2018-03-09 17:09:44 +00:00
parent 9076ddb3f6
commit dc16538a98
1 changed files with 19 additions and 10 deletions
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29
hw/arm/virt.c
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@ -1207,16 +1207,23 @@ static void machvirt_init(MachineState *machine)
/* We can probe only here because during property set
* KVM is not available yet
*/
if (!vms->gic_version) {
if (vms->gic_version <= 0) {
/* "host" or "max" */
if (!kvm_enabled()) {
error_report("gic-version=host requires KVM");
exit(1);
}
vms->gic_version = kvm_arm_vgic_probe();
if (!vms->gic_version) {
error_report("Unable to determine GIC version supported by host");
exit(1);
if (vms->gic_version == 0) {
error_report("gic-version=host requires KVM");
exit(1);
} else {
/* "max": currently means 3 for TCG */
vms->gic_version = 3;
}
} else {
vms->gic_version = kvm_arm_vgic_probe();
if (!vms->gic_version) {
error_report(
"Unable to determine GIC version supported by host");
exit(1);
}
}
}
@ -1480,9 +1487,11 @@ static void virt_set_gic_version(Object *obj, const char *value, Error **errp)
vms->gic_version = 2;
} else if (!strcmp(value, "host")) {
vms->gic_version = 0; /* Will probe later */
} else if (!strcmp(value, "max")) {
vms->gic_version = -1; /* Will probe later */
} else {
error_setg(errp, "Invalid gic-version value");
error_append_hint(errp, "Valid values are 3, 2, host.\n");
error_append_hint(errp, "Valid values are 3, 2, host, max.\n");
}
}