From: Eric Auger <eric.auger@redhat.com>
Date: Tue, 13 Jun 2017 13:57:01 +0000 (+0100)
Subject: hw/intc/arm_gicv3_its: Allow save/restore
X-Git-Tag: v2.10.0-rc0~132^2
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=252a7a6a968c279a4636a86b0559ba3a930a90b5;p=thirdparty%2Fqemu.git

hw/intc/arm_gicv3_its: Allow save/restore

We change the restoration priority of both the GICv3 and ITS. The
GICv3 must be restored before the ITS and the ITS needs to be restored
before PCIe devices since it translates their MSI transactions.

Signed-off-by: Eric Auger <eric.auger@redhat.com>
Reviewed-by: Juan Quintela <quintela@redhat.com>
Message-id: 1497023553-18411-5-git-send-email-eric.auger@redhat.com
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
---

diff --git a/hw/intc/arm_gicv3_common.c b/hw/intc/arm_gicv3_common.c
index c6493d6c074..4228b7ca005 100644
--- a/hw/intc/arm_gicv3_common.c
+++ b/hw/intc/arm_gicv3_common.c
@@ -145,6 +145,7 @@ static const VMStateDescription vmstate_gicv3 = {
     .minimum_version_id = 1,
     .pre_save = gicv3_pre_save,
     .post_load = gicv3_post_load,
+    .priority = MIG_PRI_GICV3,
     .fields = (VMStateField[]) {
         VMSTATE_UINT32(gicd_ctlr, GICv3State),
         VMSTATE_UINT32_ARRAY(gicd_statusr, GICv3State, 2),
diff --git a/hw/intc/arm_gicv3_its_common.c b/hw/intc/arm_gicv3_its_common.c
index 696c11ca13c..68b20fccd10 100644
--- a/hw/intc/arm_gicv3_its_common.c
+++ b/hw/intc/arm_gicv3_its_common.c
@@ -48,7 +48,7 @@ static const VMStateDescription vmstate_its = {
     .name = "arm_gicv3_its",
     .pre_save = gicv3_its_pre_save,
     .post_load = gicv3_its_post_load,
-    .unmigratable = true,
+    .priority = MIG_PRI_GICV3_ITS,
     .fields = (VMStateField[]) {
         VMSTATE_UINT32(ctlr, GICv3ITSState),
         VMSTATE_UINT32(iidr, GICv3ITSState),
diff --git a/hw/intc/arm_gicv3_its_kvm.c b/hw/intc/arm_gicv3_its_kvm.c
index 4cd8f5f44c5..1f8991b8a6d 100644
--- a/hw/intc/arm_gicv3_its_kvm.c
+++ b/hw/intc/arm_gicv3_its_kvm.c
@@ -85,18 +85,6 @@ static void kvm_arm_its_realize(DeviceState *dev, Error **errp)
     GICv3ITSState *s = ARM_GICV3_ITS_COMMON(dev);
     Error *local_err = NULL;
 
-    /*
-     * Block migration of a KVM GICv3 ITS device: the API for saving and
-     * restoring the state in the kernel is not yet available
-     */
-    error_setg(&s->migration_blocker, "vITS migration is not implemented");
-    migrate_add_blocker(s->migration_blocker, &local_err);
-    if (local_err) {
-        error_propagate(errp, local_err);
-        error_free(s->migration_blocker);
-        return;
-    }
-
     s->dev_fd = kvm_create_device(kvm_state, KVM_DEV_TYPE_ARM_VGIC_ITS, false);
     if (s->dev_fd < 0) {
         error_setg_errno(errp, -s->dev_fd, "error creating in-kernel ITS");
@@ -113,6 +101,18 @@ static void kvm_arm_its_realize(DeviceState *dev, Error **errp)
 
     gicv3_its_init_mmio(s, NULL);
 
+    if (!kvm_device_check_attr(s->dev_fd, KVM_DEV_ARM_VGIC_GRP_ITS_REGS,
+        GITS_CTLR)) {
+        error_setg(&s->migration_blocker, "This operating system kernel "
+                   "does not support vITS migration");
+        migrate_add_blocker(s->migration_blocker, &local_err);
+        if (local_err) {
+            error_propagate(errp, local_err);
+            error_free(s->migration_blocker);
+            return;
+        }
+    }
+
     kvm_msi_use_devid = true;
     kvm_gsi_direct_mapping = false;
     kvm_msi_via_irqfd_allowed = kvm_irqfds_enabled();
diff --git a/include/migration/vmstate.h b/include/migration/vmstate.h
index 79a4b350a80..f3f3c2af4dc 100644
--- a/include/migration/vmstate.h
+++ b/include/migration/vmstate.h
@@ -149,6 +149,8 @@ enum VMStateFlags {
 typedef enum {
     MIG_PRI_DEFAULT = 0,
     MIG_PRI_IOMMU,              /* Must happen before PCI devices */
+    MIG_PRI_GICV3_ITS,          /* Must happen before PCI devices */
+    MIG_PRI_GICV3,              /* Must happen before the ITS */
     MIG_PRI_MAX,
 } MigrationPriority;