hw/intc/arm_gicv3_kvm: Implement pending table save

This patch adds the flush of the LPI pending bits into the
redistributor pending tables. This happens on VM stop.

There is no explicit restore as the tables are implicitly sync'ed
on ITS table restore and on LPI enable at redistributor level.
Signed-off-by: Eric Auger <eric.auger@redhat.com>
Message-id: 1497023553-18411-4-git-send-email-eric.auger@redhat.com
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

hw/intc/arm_gicv3_kvm.c

@@ -25,6 +25,7 @@
 #include "hw/sysbus.h"
 #include "qemu/error-report.h"
 #include "sysemu/kvm.h"
+#include "sysemu/sysemu.h"
 #include "kvm_arm.h"
 #include "gicv3_internal.h"
 #include "vgic_common.h"
@@ -680,6 +681,35 @@ static const ARMCPRegInfo gicv3_cpuif_reginfo[] = {
     REGINFO_SENTINEL
 };
 
+/**
+ * vm_change_state_handler - VM change state callback aiming at flushing
+ * RDIST pending tables into guest RAM
+ *
+ * The tables get flushed to guest RAM whenever the VM gets stopped.
+ */
+static void vm_change_state_handler(void *opaque, int running,
+                                    RunState state)
+{
+    GICv3State *s = (GICv3State *)opaque;
+    Error *err = NULL;
+    int ret;
+
+    if (running) {
+        return;
+    }
+
+    ret = kvm_device_access(s->dev_fd, KVM_DEV_ARM_VGIC_GRP_CTRL,
+                           KVM_DEV_ARM_VGIC_SAVE_PENDING_TABLES,
+                           NULL, true, &err);
+    if (err) {
+        error_report_err(err);
+    }
+    if (ret < 0 && ret != -EFAULT) {
+        abort();
+    }
+}
+
+
 static void kvm_arm_gicv3_realize(DeviceState *dev, Error **errp)
 {
     GICv3State *s = KVM_ARM_GICV3(dev);
@@ -751,6 +781,10 @@ static void kvm_arm_gicv3_realize(DeviceState *dev, Error **errp)
             return;
         }
     }
+    if (kvm_device_check_attr(s->dev_fd, KVM_DEV_ARM_VGIC_GRP_CTRL,
+                              KVM_DEV_ARM_VGIC_SAVE_PENDING_TABLES)) {
+        qemu_add_vm_change_state_handler(vm_change_state_handler, s);
+    }
 }
 
 static void kvm_arm_gicv3_class_init(ObjectClass *klass, void *data)