@@ -39,6 +39,18 @@ int hyperv_post_msg(HvSintRoute *sint_route, struct hyperv_message *msg);
*/
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.
@@ -46,6 +58,12 @@ int hyperv_set_event_flag(HvSintRoute *sint_route, unsigned eventno);
*/
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.
@@ -455,6 +455,14 @@ int hyperv_sint_route_set_sint(HvSintRoute *sint_route)
return event_notifier_set(&sint_route->sint_set_notifier);
}
+typedef struct MsgHandler {
+ struct rcu_head rcu;
+ QLIST_ENTRY(MsgHandler) link;
+ uint32_t conn_id;
+ HvMsgHandler handler;
+ void *data;
+} MsgHandler;
+
typedef struct EventFlagHandler {
struct rcu_head rcu;
QLIST_ENTRY(EventFlagHandler) link;
@@ -462,15 +470,91 @@ typedef struct EventFlagHandler {
EventNotifier *notifier;
} EventFlagHandler;
+static QLIST_HEAD(, MsgHandler) msg_handlers;
static QLIST_HEAD(, EventFlagHandler) event_flag_handlers;
static QemuMutex handlers_mutex;
static void __attribute__((constructor)) hv_init(void)
{
+ QLIST_INIT(&msg_handlers);
QLIST_INIT(&event_flag_handlers);
qemu_mutex_init(&handlers_mutex);
}
+int hyperv_set_msg_handler(uint32_t conn_id, HvMsgHandler handler, void *data)
+{
+ int ret;
+ MsgHandler *mh;
+
+ qemu_mutex_lock(&handlers_mutex);
+ QLIST_FOREACH(mh, &msg_handlers, link) {
+ if (mh->conn_id == conn_id) {
+ if (handler) {
+ ret = -EEXIST;
+ } else {
+ QLIST_REMOVE_RCU(mh, link);
+ g_free_rcu(mh, rcu);
+ ret = 0;
+ }
+ goto unlock;
+ }
+ }
+
+ if (handler) {
+ mh = g_new(MsgHandler, 1);
+ mh->conn_id = conn_id;
+ mh->handler = handler;
+ mh->data = data;
+ QLIST_INSERT_HEAD_RCU(&msg_handlers, mh, link);
+ ret = 0;
+ } else {
+ ret = -ENOENT;
+ }
+unlock:
+ qemu_mutex_unlock(&handlers_mutex);
+ return ret;
+}
+
+uint16_t hyperv_hcall_post_message(uint64_t param, bool fast)
+{
+ uint16_t ret;
+ hwaddr len;
+ struct hyperv_post_message_input *msg;
+ MsgHandler *mh;
+
+ if (fast) {
+ return HV_STATUS_INVALID_HYPERCALL_CODE;
+ }
+ if (param & (__alignof__(*msg) - 1)) {
+ return HV_STATUS_INVALID_ALIGNMENT;
+ }
+
+ len = sizeof(*msg);
+ msg = cpu_physical_memory_map(param, &len, 0);
+ if (len < sizeof(*msg)) {
+ ret = HV_STATUS_INSUFFICIENT_MEMORY;
+ goto unmap;
+ }
+ if (msg->payload_size > sizeof(msg->payload)) {
+ ret = HV_STATUS_INVALID_HYPERCALL_INPUT;
+ goto unmap;
+ }
+
+ ret = HV_STATUS_INVALID_CONNECTION_ID;
+ rcu_read_lock();
+ QLIST_FOREACH_RCU(mh, &msg_handlers, link) {
+ if (mh->conn_id == (msg->connection_id & HV_CONNECTION_ID_MASK)) {
+ ret = mh->handler(msg, mh->data);
+ break;
+ }
+ }
+ rcu_read_unlock();
+
+unmap:
+ cpu_physical_memory_unmap(msg, len, 0, 0);
+ return ret;
+}
+
static int set_event_flag_handler(uint32_t conn_id, EventNotifier *notifier)
{
int ret;
@@ -84,6 +84,9 @@ int kvm_hv_handle_exit(X86CPU *cpu, struct kvm_hyperv_exit *exit)
uint64_t param = exit->u.hcall.params[0];
switch (code) {
+ case HV_POST_MESSAGE:
+ exit->u.hcall.result = hyperv_hcall_post_message(param, fast);
+ break;
case HV_SIGNAL_EVENT:
exit->u.hcall.result = hyperv_hcall_signal_event(param, fast);
break;
Add handling of POST_MESSAGE hypercall. For that, add an interface to regsiter a handler for the messages arrived from the guest on a particular connection id (IOW set up a message connection in Hyper-V speak). Signed-off-by: Roman Kagan <rkagan@virtuozzo.com> --- include/hw/hyperv/hyperv.h | 18 ++++++++ hw/hyperv/hyperv.c | 84 ++++++++++++++++++++++++++++++++++++++ target/i386/hyperv.c | 3 ++ 3 files changed, 105 insertions(+)