[RFC PATCH 5/5] Enable the MTE support for KVM guest

[Haibo Xu <haibo.xu@linaro.org>]

Signed-off-by: Haibo Xu <haibo.xu@linaro.org>
---
 hw/arm/virt.c | 22 +++++++++++++++++++---
 1 file changed, 19 insertions(+), 3 deletions(-)

diff --git a/hw/arm/virt.c b/hw/arm/virt.c
index 623d5e9397..c2358cf4c5 100644
--- a/hw/arm/virt.c
+++ b/hw/arm/virt.c
@@ -79,6 +79,7 @@
 #include "hw/virtio/virtio-iommu.h"
 #include "hw/char/pl011.h"
 #include "qemu/guest-random.h"
+#include "migration/misc.h"
 
 #define DEFINE_VIRT_MACHINE_LATEST(major, minor, latest) \
     static void virt_##major##_##minor##_class_init(ObjectClass *oc, \
@@ -821,6 +822,21 @@ static void virt_powerdown_req(Notifier *n, void *opaque)
     }
 }
 
+static int virt_precopy_notify(NotifierWithReturn *n, void *data)
+{
+    PrecopyNotifyData *pnd = data;
+
+    switch (pnd->reason) {
+    case PRECOPY_NOTIFY_SETUP:
+        precopy_enable_metadata_migration();
+        break;
+    default:
+        break;
+    }
+
+    return 0;
+}
+
 static void create_gpio_keys(const VirtMachineState *vms,
                              DeviceState *pl061_dev,
                              uint32_t phandle)
@@ -1898,9 +1914,9 @@ static void machvirt_init(MachineState *machine)
     }
 
     if (vms->mte && kvm_enabled()) {
-        error_report("mach-virt: KVM does not support providing "
-                     "MTE to the guest CPU");
-        exit(1);
+        /* connect migration precopy request */
+        vms->precopy_notifier.notify = virt_precopy_notify;
+        precopy_add_notifier(&vms->precopy_notifier);
     }
 
     create_fdt(vms);
-- 
2.17.1