Introduce Virtio-loopback epsilon release:

Epsilon release introduces a new compatibility layer which make virtio-loopback
design to work with QEMU and rust-vmm vhost-user backend without require any
changes.

Signed-off-by: Timos Ampelikiotis <t.ampelikiotis@virtualopensystems.com>
Change-Id: I52e57563e08a7d0bdc002f8e928ee61ba0c53dd9

1 files changed, 53 insertions, 0 deletions

diff --git a/include/hw/misc/pvpanic.h b/include/hw/misc/pvpanic.h
new file mode 100644
index 000000000..ca3c5bb53
--- /dev/null
+++ b/include/hw/misc/pvpanic.h
@@ -0,0 +1,53 @@
+/*
+ * QEMU simulated pvpanic device.
+ *
+ * Copyright Fujitsu, Corp. 2013
+ *
+ * Authors:
+ *     Wen Congyang <wency@cn.fujitsu.com>
+ *     Hu Tao <hutao@cn.fujitsu.com>
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2 or later.
+ * See the COPYING file in the top-level directory.
+ *
+ */
+
+#ifndef HW_MISC_PVPANIC_H
+#define HW_MISC_PVPANIC_H
+
+#include "qom/object.h"
+
+#define TYPE_PVPANIC_ISA_DEVICE "pvpanic"
+#define TYPE_PVPANIC_PCI_DEVICE "pvpanic-pci"
+
+#define PVPANIC_IOPORT_PROP "ioport"
+
+/* The bit of supported pv event, TODO: include uapi header and remove this */
+#define PVPANIC_F_PANICKED      0
+#define PVPANIC_F_CRASHLOADED   1
+
+/* The pv event value */
+#define PVPANIC_PANICKED        (1 << PVPANIC_F_PANICKED)
+#define PVPANIC_CRASHLOADED     (1 << PVPANIC_F_CRASHLOADED)
+
+/*
+ * PVPanicState for any device type
+ */
+typedef struct PVPanicState PVPanicState;
+struct PVPanicState {
+    MemoryRegion mr;
+    uint8_t events;
+};
+
+void pvpanic_setup_io(PVPanicState *s, DeviceState *dev, unsigned size);
+
+static inline uint16_t pvpanic_port(void)
+{
+    Object *o = object_resolve_path_type("", TYPE_PVPANIC_ISA_DEVICE, NULL);
+    if (!o) {
+        return 0;
+    }
+    return object_property_get_uint(o, PVPANIC_IOPORT_PROP, NULL);
+}
+
+#endif