[Qemu-devel] [PATCH 4/4] Revert "spapr: fix memory hot-unplugging"

[Laurent Vivier]

This reverts commit fe6824d12642b005c69123ecf8631f9b13553f8b.

This didn't fix the problem. Once the hotplug has been started
some memory is allocated and some structures are allocated.
We don't free it when we ignore the unplug, and we can't because
they can be in use by the kernel.

Signed-off-by: Laurent Vivier <address@hidden>
---
 hw/ppc/spapr_drc.c         | 20 +++-----------------
 include/hw/ppc/spapr_drc.h |  1 -
 2 files changed, 3 insertions(+), 18 deletions(-)

diff --git a/hw/ppc/spapr_drc.c b/hw/ppc/spapr_drc.c
index 9fa5545..2bda00f 100644
--- a/hw/ppc/spapr_drc.c
+++ b/hw/ppc/spapr_drc.c
@@ -135,17 +135,6 @@ static uint32_t set_allocation_state(sPAPRDRConnector *drc,
         if (!drc->dev) {
             return RTAS_OUT_NO_SUCH_INDICATOR;
         }
-        if (drc->awaiting_release && drc->awaiting_allocation) {
-            /* kernel is acknowledging a previous hotplug event
-             * while we are already removing it.
-             * it's safe to ignore awaiting_allocation here since we know the
-             * situation is predicated on the guest either already having done
-             * so (boot-time hotplug), or never being able to acquire in the
-             * first place (hotplug followed by immediate unplug).
-             */
-            drc->awaiting_allocation_skippable = true;
-            return RTAS_OUT_NO_SUCH_INDICATOR;
-        }
     }
 
     if (drc->type != SPAPR_DR_CONNECTOR_TYPE_PCI) {
@@ -447,11 +436,9 @@ static void detach(sPAPRDRConnector *drc, DeviceState *d,
     }
 
     if (drc->awaiting_allocation) {
-        if (!drc->awaiting_allocation_skippable) {
-            drc->awaiting_release = true;
-            trace_spapr_drc_awaiting_allocation(get_index(drc));
-            return;
-        }
+        drc->awaiting_release = true;
+        trace_spapr_drc_awaiting_allocation(get_index(drc));
+        return;
     }
 
     drc->indicator_state = SPAPR_DR_INDICATOR_STATE_INACTIVE;
@@ -461,7 +448,6 @@ static void detach(sPAPRDRConnector *drc, DeviceState *d,
     }
 
     drc->awaiting_release = false;
-    drc->awaiting_allocation_skippable = false;
     g_free(drc->fdt);
     drc->fdt = NULL;
     drc->fdt_start_offset = 0;
diff --git a/include/hw/ppc/spapr_drc.h b/include/hw/ppc/spapr_drc.h
index 5524247..fa531d5 100644
--- a/include/hw/ppc/spapr_drc.h
+++ b/include/hw/ppc/spapr_drc.h
@@ -154,7 +154,6 @@ typedef struct sPAPRDRConnector {
     bool awaiting_release;
     bool signalled;
     bool awaiting_allocation;
-    bool awaiting_allocation_skippable;
 
     /* device pointer, via link property */
     DeviceState *dev;
-- 
2.9.4