spapr: Handle pending hot plug/unplug requests at CAS

If a hot plug or unplug request is pending at CAS, we currently trigger
a CAS reboot, which severely increases the guest boot time. This is
because SLOF doesn't handle hot plug events and we had no way to fix
the FDT that gets presented to the guest.

We can do better thanks to recent changes in QEMU and SLOF:

- we now return a full FDT to SLOF during CAS

- SLOF was fixed to correctly detect any device that was either added or
  removed since boot time and to update its internal DT accordingly.

The right solution is to process all pending hot plug/unplug requests
during CAS: convert hot plugged devices to cold plugged devices and
remove the hot unplugged ones, which is exactly what spapr_drc_reset()
does. Also clear all hot plug events that are currently queued since
they're no longer relevant.

Note that SLOF cannot currently populate hot plugged PCI bridges or PHBs
at CAS. Until this limitation is lifted, SLOF will reset the machine when
this scenario occurs : this will allow the FDT to be fully processed when
SLOF is started again (ie. the same effect as the CAS reboot that would
occur anyway without this patch).

Signed-off-by: Greg Kurz <groug@kaod.org>
Message-Id: <158257222352.4102917.8984214333937947307.stgit@bahia.lan>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>

1 files changed, 5 insertions, 6 deletions

diff --git a/hw/ppc/spapr_hcall.c b/hw/ppc/spapr_hcall.c
index 934eb12d27..c2b3286625 100644
--- a/hw/ppc/spapr_hcall.c
+++ b/hw/ppc/spapr_hcall.c
@@ -1640,7 +1640,7 @@ static uint32_t cas_check_pvr(SpaprMachineState *spapr, PowerPCCPU *cpu,
     return best_compat;
 }
 
-static bool spapr_transient_dev_before_cas(void)
+static void spapr_handle_transient_dev_before_cas(SpaprMachineState *spapr)
 {
     Object *drc_container;
     ObjectProperty *prop;
@@ -1658,10 +1658,11 @@ static bool spapr_transient_dev_before_cas(void)
                                                           prop->name, NULL));
 
         if (spapr_drc_transient(drc)) {
-            return true;
+            spapr_drc_reset(drc);
         }
     }
-    return false;
+
+    spapr_clear_pending_hotplug_events(spapr);
 }
 
 static target_ulong h_client_architecture_support(PowerPCCPU *cpu,
@@ -1834,9 +1835,7 @@ static target_ulong h_client_architecture_support(PowerPCCPU *cpu,
 
     spapr_irq_update_active_intc(spapr);
 
-    if (spapr_transient_dev_before_cas()) {
-        spapr->cas_reboot = true;
-    }
+    spapr_handle_transient_dev_before_cas(spapr);
 
     if (!spapr->cas_reboot) {
         void *fdt;