[Qemu-devel] [RFC 14/17] pseries: Reset CPU compatibility mode

[David Gibson <david@gibson.dropbear.id.au>]

Currently, the CPU compatibility mode is set when the cpu is initialized,
then again when the guest negotiates features.  This means if a guest
negotiates a compatibility mode, then reboots, that compatibility mode
will be retained across the reset.

Usually that will get overridden when features are negotiated on the next
boot, but it's still not really correct.  This patch moves the initial set
up of the compatibility mode from cpu init to reset time.  The mode *is*
retained if the reboot was caused by the feature negotiation (it might
be important in that case, though it's unlikely).

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
---
 hw/ppc/spapr.c          |  2 ++
 hw/ppc/spapr_cpu_core.c | 10 ----------
 2 files changed, 2 insertions(+), 10 deletions(-)

diff --git a/hw/ppc/spapr.c b/hw/ppc/spapr.c
index b983faa..2aa0900 100644
--- a/hw/ppc/spapr.c
+++ b/hw/ppc/spapr.c
@@ -1169,6 +1169,8 @@ static void ppc_spapr_reset(void)
     if (!spapr->cas_reboot) {
         spapr_ovec_cleanup(spapr->ov5_cas);
         spapr->ov5_cas = spapr_ovec_new();
+
+        ppc_set_compat_all(spapr->max_compat_pvr, &error_abort);
     }
 
     fdt = spapr_build_fdt(spapr, rtas_addr, spapr->rtas_size);
diff --git a/hw/ppc/spapr_cpu_core.c b/hw/ppc/spapr_cpu_core.c
index 0319516..4b6134b 100644
--- a/hw/ppc/spapr_cpu_core.c
+++ b/hw/ppc/spapr_cpu_core.c
@@ -103,16 +103,6 @@ static void spapr_cpu_init(sPAPRMachineState *spapr, PowerPCCPU *cpu,
     cpu_ppc_set_vhyp(cpu, PPC_VIRTUAL_HYPERVISOR(spapr));
     cpu_ppc_set_papr(cpu);
 
-    if (spapr->max_compat_pvr) {
-        Error *local_err = NULL;
-
-        ppc_set_compat(cpu, spapr->max_compat_pvr, &local_err);
-        if (local_err) {
-            error_propagate(errp, local_err);
-            return;
-        }
-    }
-
     /* Set NUMA node for the added CPUs  */
     i = numa_get_node_for_cpu(cs->cpu_index);
     if (i < nb_numa_nodes) {
-- 
2.7.4