spapr: Simplify handling of pre ISA 3.0 guest workaround handling

Certain old guest versions don't understand the radix MMU introduced with
POWER ISA 3.0, but incorrectly select it if presented with the option at
CAS time.  We workaround this in qemu by explicitly excluding the radix
(and other ISA 3.0 linked) options if the guest doesn't explicitly note
support for ISA 3.0.

This is handled by the 'cas_legacy_guest_workaround' flag, which is pretty
vague.  Rename it to 'cas_pre_isa3_guest' to be clearer about what it's for.

In addition, we unnecessarily call spapr_populate_pa_features() with
different options when initially constructing the device tree and when
adjusting it at CAS time.  At the initial construct time cas_pre_isa3_guest
is already false, so we can still use the flag, rather than explicitly
overriding it to be false at the callsite.

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Reviewed-by: Cédric Le Goater <clg@kaod.org>
Reviewed-by: Greg Kurz <groug@kaod.org>
Reviewed-by: Alexey Kardashevskiy <aik@ozlabs.ru>

1 files changed, 1 insertions, 1 deletions

diff --git a/include/hw/ppc/spapr.h b/include/hw/ppc/spapr.h
index 03111fd55b..dfec8e8e76 100644
--- a/include/hw/ppc/spapr.h
+++ b/include/hw/ppc/spapr.h
@@ -175,7 +175,7 @@ struct SpaprMachineState {
 
     /* ibm,client-architecture-support option negotiation */
     bool cas_reboot;
-    bool cas_legacy_guest_workaround;
+    bool cas_pre_isa3_guest;
     SpaprOptionVector *ov5;         /* QEMU-supported option vectors */
     SpaprOptionVector *ov5_cas;     /* negotiated (via CAS) option vectors */
     uint32_t max_compat_pvr;