hyperv: process POST_MESSAGE hypercall
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> Message-Id: <20180921082217.29481-10-rkagan@virtuozzo.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
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@ -455,6 +455,14 @@ int hyperv_sint_route_set_sint(HvSintRoute *sint_route)
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return event_notifier_set(&sint_route->sint_set_notifier);
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}
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typedef struct MsgHandler {
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struct rcu_head rcu;
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QLIST_ENTRY(MsgHandler) link;
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uint32_t conn_id;
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HvMsgHandler handler;
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void *data;
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} MsgHandler;
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typedef struct EventFlagHandler {
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struct rcu_head rcu;
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QLIST_ENTRY(EventFlagHandler) link;
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@ -462,15 +470,91 @@ typedef struct EventFlagHandler {
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EventNotifier *notifier;
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} EventFlagHandler;
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static QLIST_HEAD(, MsgHandler) msg_handlers;
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static QLIST_HEAD(, EventFlagHandler) event_flag_handlers;
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static QemuMutex handlers_mutex;
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static void __attribute__((constructor)) hv_init(void)
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{
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QLIST_INIT(&msg_handlers);
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QLIST_INIT(&event_flag_handlers);
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qemu_mutex_init(&handlers_mutex);
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}
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int hyperv_set_msg_handler(uint32_t conn_id, HvMsgHandler handler, void *data)
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{
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int ret;
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MsgHandler *mh;
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qemu_mutex_lock(&handlers_mutex);
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QLIST_FOREACH(mh, &msg_handlers, link) {
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if (mh->conn_id == conn_id) {
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if (handler) {
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ret = -EEXIST;
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} else {
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QLIST_REMOVE_RCU(mh, link);
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g_free_rcu(mh, rcu);
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ret = 0;
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}
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goto unlock;
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}
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}
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if (handler) {
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mh = g_new(MsgHandler, 1);
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mh->conn_id = conn_id;
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mh->handler = handler;
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mh->data = data;
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QLIST_INSERT_HEAD_RCU(&msg_handlers, mh, link);
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ret = 0;
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} else {
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ret = -ENOENT;
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}
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unlock:
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qemu_mutex_unlock(&handlers_mutex);
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return ret;
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}
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uint16_t hyperv_hcall_post_message(uint64_t param, bool fast)
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{
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uint16_t ret;
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hwaddr len;
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struct hyperv_post_message_input *msg;
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MsgHandler *mh;
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if (fast) {
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return HV_STATUS_INVALID_HYPERCALL_CODE;
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}
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if (param & (__alignof__(*msg) - 1)) {
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return HV_STATUS_INVALID_ALIGNMENT;
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}
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len = sizeof(*msg);
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msg = cpu_physical_memory_map(param, &len, 0);
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if (len < sizeof(*msg)) {
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ret = HV_STATUS_INSUFFICIENT_MEMORY;
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goto unmap;
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}
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if (msg->payload_size > sizeof(msg->payload)) {
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ret = HV_STATUS_INVALID_HYPERCALL_INPUT;
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goto unmap;
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}
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ret = HV_STATUS_INVALID_CONNECTION_ID;
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rcu_read_lock();
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QLIST_FOREACH_RCU(mh, &msg_handlers, link) {
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if (mh->conn_id == (msg->connection_id & HV_CONNECTION_ID_MASK)) {
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ret = mh->handler(msg, mh->data);
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break;
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}
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}
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rcu_read_unlock();
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unmap:
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cpu_physical_memory_unmap(msg, len, 0, 0);
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return ret;
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}
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static int set_event_flag_handler(uint32_t conn_id, EventNotifier *notifier)
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{
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int ret;
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@ -39,6 +39,18 @@ int hyperv_post_msg(HvSintRoute *sint_route, struct hyperv_message *msg);
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*/
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int hyperv_set_event_flag(HvSintRoute *sint_route, unsigned eventno);
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/*
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* Handler for messages arriving from the guest via HV_POST_MESSAGE hypercall.
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* Executed in vcpu context.
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*/
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typedef uint16_t (*HvMsgHandler)(const struct hyperv_post_message_input *msg,
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void *data);
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/*
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* Associate @handler with the message connection @conn_id, such that @handler
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* is called with @data when the guest executes HV_POST_MESSAGE hypercall on
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* @conn_id. If @handler is NULL clear the association.
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*/
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int hyperv_set_msg_handler(uint32_t conn_id, HvMsgHandler handler, void *data);
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/*
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* Associate @notifier with the event connection @conn_id, such that @notifier
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* is signaled when the guest executes HV_SIGNAL_EVENT hypercall on @conn_id.
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@ -46,6 +58,12 @@ int hyperv_set_event_flag(HvSintRoute *sint_route, unsigned eventno);
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*/
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int hyperv_set_event_flag_handler(uint32_t conn_id, EventNotifier *notifier);
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/*
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* Process HV_POST_MESSAGE hypercall: parse the data in the guest memory as
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* specified in @param, and call the HvMsgHandler associated with the
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* connection on the message contained therein.
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*/
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uint16_t hyperv_hcall_post_message(uint64_t param, bool fast);
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/*
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* Process HV_SIGNAL_EVENT hypercall: signal the EventNotifier associated with
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* the connection as specified in @param.
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@ -84,6 +84,9 @@ int kvm_hv_handle_exit(X86CPU *cpu, struct kvm_hyperv_exit *exit)
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uint64_t param = exit->u.hcall.params[0];
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switch (code) {
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case HV_POST_MESSAGE:
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exit->u.hcall.result = hyperv_hcall_post_message(param, fast);
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break;
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case HV_SIGNAL_EVENT:
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exit->u.hcall.result = hyperv_hcall_signal_event(param, fast);
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break;
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