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hyperv: process POST_MESSAGE hypercall

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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>
This commit is contained in:
Roman Kagan 2018-09-21 11:22:16 +03:00 • committed by Paolo Bonzini
parent 8d3bc0b753
commit 76036a5fc7
3 changed files with 105 additions and 0 deletions
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84
hw/hyperv/hyperv.c
View file

@ -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;