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, 84 insertions, 0 deletions

diff --git a/include/hw/hyperv/hyperv.h b/include/hw/hyperv/hyperv.h
new file mode 100644
index 000000000..a63ee0003
--- /dev/null
+++ b/include/hw/hyperv/hyperv.h
@@ -0,0 +1,84 @@
+/*
+ * Hyper-V guest/hypervisor interaction
+ *
+ * Copyright (c) 2015-2018 Virtuozzo International GmbH.
+ *
+ * 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_HYPERV_HYPERV_H
+#define HW_HYPERV_HYPERV_H
+
+#include "cpu-qom.h"
+#include "hw/hyperv/hyperv-proto.h"
+
+typedef struct HvSintRoute HvSintRoute;
+
+/*
+ * Callback executed in a bottom-half when the status of posting the message
+ * becomes known, before unblocking the connection for further messages
+ */
+typedef void (*HvSintMsgCb)(void *data, int status);
+
+HvSintRoute *hyperv_sint_route_new(uint32_t vp_index, uint32_t sint,
+                                   HvSintMsgCb cb, void *cb_data);
+void hyperv_sint_route_ref(HvSintRoute *sint_route);
+void hyperv_sint_route_unref(HvSintRoute *sint_route);
+
+int hyperv_sint_route_set_sint(HvSintRoute *sint_route);
+
+/*
+ * Submit a message to be posted in vcpu context.  If the submission succeeds,
+ * the status of posting the message is reported via the callback associated
+ * with the @sint_route; until then no more messages are accepted.
+ */
+int hyperv_post_msg(HvSintRoute *sint_route, struct hyperv_message *msg);
+/*
+ * Set event flag @eventno, and signal the SINT if the flag has changed.
+ */
+int hyperv_set_event_flag(HvSintRoute *sint_route, unsigned eventno);
+
+/*
+ * Handler for messages arriving from the guest via HV_POST_MESSAGE hypercall.
+ * Executed in vcpu context.
+ */
+typedef uint16_t (*HvMsgHandler)(const struct hyperv_post_message_input *msg,
+                                 void *data);
+/*
+ * Associate @handler with the message connection @conn_id, such that @handler
+ * is called with @data when the guest executes HV_POST_MESSAGE hypercall on
+ * @conn_id.  If @handler is NULL clear the association.
+ */
+int hyperv_set_msg_handler(uint32_t conn_id, HvMsgHandler handler, void *data);
+/*
+ * Associate @notifier with the event connection @conn_id, such that @notifier
+ * is signaled when the guest executes HV_SIGNAL_EVENT hypercall on @conn_id.
+ * If @notifier is NULL clear the association.
+ */
+int hyperv_set_event_flag_handler(uint32_t conn_id, EventNotifier *notifier);
+
+/*
+ * Process HV_POST_MESSAGE hypercall: parse the data in the guest memory as
+ * specified in @param, and call the HvMsgHandler associated with the
+ * connection on the message contained therein.
+ */
+uint16_t hyperv_hcall_post_message(uint64_t param, bool fast);
+/*
+ * Process HV_SIGNAL_EVENT hypercall: signal the EventNotifier associated with
+ * the connection as specified in @param.
+ */
+uint16_t hyperv_hcall_signal_event(uint64_t param, bool fast);
+
+static inline uint32_t hyperv_vp_index(CPUState *cs)
+{
+    return cs->cpu_index;
+}
+
+void hyperv_synic_add(CPUState *cs);
+void hyperv_synic_reset(CPUState *cs);
+void hyperv_synic_update(CPUState *cs, bool enable,
+                         hwaddr msg_page_addr, hwaddr event_page_addr);
+bool hyperv_is_synic_enabled(void);
+
+#endif