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 <rka...@virtuozzo.com>
---
target/i386/hyperv.h | 5 +++
target/i386/hyperv.c | 87 ++++++++++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 92 insertions(+)
diff --git a/target/i386/hyperv.h b/target/i386/hyperv.h
index 4ce41fe314..fcc41caf1f 100644
--- a/target/i386/hyperv.h
+++ b/target/i386/hyperv.h
@@ -43,6 +43,11 @@ int hyperv_post_msg(HvSintRoute *sint_route, struct
hyperv_message *msg);
int hyperv_set_evt_flag(HvSintRoute *sint_route, unsigned evtno);
+struct hyperv_post_message_input;
+typedef uint64_t (*HvMsgHandler)(const struct hyperv_post_message_input *msg,
+ void *data);
+int hyperv_set_msg_handler(uint32_t conn_id, HvMsgHandler handler, void *data);
+
int hyperv_set_evt_notifier(uint32_t conn_id, EventNotifier *notifier);
#endif
diff --git a/target/i386/hyperv.c b/target/i386/hyperv.c
index 9cf1225385..3dc8a7acb0 100644
--- a/target/i386/hyperv.c
+++ b/target/i386/hyperv.c
@@ -252,6 +252,14 @@ static void async_synic_update(CPUState *cs,
run_on_cpu_data data)
qemu_mutex_unlock_iothread();
}
+typedef struct MsgHandler {
+ struct rcu_head rcu;
+ QLIST_ENTRY(MsgHandler) le;
+ uint32_t conn_id;
+ HvMsgHandler handler;
+ void *data;
+} MsgHandler;
+
typedef struct EvtHandler {
struct rcu_head rcu;
QLIST_ENTRY(EvtHandler) le;
@@ -259,15 +267,51 @@ typedef struct EvtHandler {
EventNotifier *notifier;
} EvtHandler;
+static QLIST_HEAD(, MsgHandler) msg_handlers;
static QLIST_HEAD(, EvtHandler) evt_handlers;
static QemuMutex handlers_mutex;
static void __attribute__((constructor)) hv_init(void)
{
+ QLIST_INIT(&msg_handlers);
QLIST_INIT(&evt_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, le) {
+ if (mh->conn_id == conn_id) {
+ if (handler) {
+ ret = -EEXIST;
+ } else {
+ QLIST_REMOVE_RCU(mh, le);
+ 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, le);
+ ret = 0;
+ } else {
+ ret = -ENOENT;
+ }
+unlock:
+ qemu_mutex_unlock(&handlers_mutex);
+ return ret;
+}
+
int hyperv_set_evt_notifier(uint32_t conn_id, EventNotifier *notifier)
{
int ret;
@@ -301,6 +345,46 @@ unlock:
return ret;
}
+static uint64_t hvcall_post_message(uint64_t param, bool fast)
+{
+ uint64_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, le) {
+ 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 uint64_t sigevent_params(hwaddr addr, uint32_t *conn_id)
{
uint64_t ret;
@@ -389,6 +473,9 @@ 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 = hvcall_post_message(param, fast);
+ break;
case HV_SIGNAL_EVENT:
exit->u.hcall.result = hvcall_signal_event(param, fast);
break;
--
2.14.3
