diff options
Diffstat (limited to 'hw/hyperv')
-rw-r--r-- | hw/hyperv/hyperv.c | 93 |
1 files changed, 93 insertions, 0 deletions
diff --git a/hw/hyperv/hyperv.c b/hw/hyperv/hyperv.c index 2b0e593..d745016 100644 --- a/hw/hyperv/hyperv.c +++ b/hw/hyperv/hyperv.c @@ -13,6 +13,9 @@ #include "exec/address-spaces.h" #include "sysemu/kvm.h" #include "qemu/bitops.h" +#include "qemu/queue.h" +#include "qemu/rcu.h" +#include "qemu/rcu_queue.h" #include "hw/hyperv/hyperv.h" typedef struct SynICState { @@ -450,3 +453,93 @@ int hyperv_sint_route_set_sint(HvSintRoute *sint_route) { return event_notifier_set(&sint_route->sint_set_notifier); } + +typedef struct EventFlagHandler { + struct rcu_head rcu; + QLIST_ENTRY(EventFlagHandler) link; + uint32_t conn_id; + EventNotifier *notifier; +} EventFlagHandler; + +static QLIST_HEAD(, EventFlagHandler) event_flag_handlers; +static QemuMutex handlers_mutex; + +static void __attribute__((constructor)) hv_init(void) +{ + QLIST_INIT(&event_flag_handlers); + qemu_mutex_init(&handlers_mutex); +} + +int hyperv_set_event_flag_handler(uint32_t conn_id, EventNotifier *notifier) +{ + int ret; + EventFlagHandler *handler; + + qemu_mutex_lock(&handlers_mutex); + QLIST_FOREACH(handler, &event_flag_handlers, link) { + if (handler->conn_id == conn_id) { + if (notifier) { + ret = -EEXIST; + } else { + QLIST_REMOVE_RCU(handler, link); + g_free_rcu(handler, rcu); + ret = 0; + } + goto unlock; + } + } + + if (notifier) { + handler = g_new(EventFlagHandler, 1); + handler->conn_id = conn_id; + handler->notifier = notifier; + QLIST_INSERT_HEAD_RCU(&event_flag_handlers, handler, link); + ret = 0; + } else { + ret = -ENOENT; + } +unlock: + qemu_mutex_unlock(&handlers_mutex); + return ret; +} + +uint16_t hyperv_hcall_signal_event(uint64_t param, bool fast) +{ + uint16_t ret; + EventFlagHandler *handler; + + if (unlikely(!fast)) { + hwaddr addr = param; + + if (addr & (__alignof__(addr) - 1)) { + return HV_STATUS_INVALID_ALIGNMENT; + } + + param = ldq_phys(&address_space_memory, addr); + } + + /* + * Per spec, bits 32-47 contain the extra "flag number". However, we + * have no use for it, and in all known usecases it is zero, so just + * report lookup failure if it isn't. + */ + if (param & 0xffff00000000ULL) { + return HV_STATUS_INVALID_PORT_ID; + } + /* remaining bits are reserved-zero */ + if (param & ~HV_CONNECTION_ID_MASK) { + return HV_STATUS_INVALID_HYPERCALL_INPUT; + } + + ret = HV_STATUS_INVALID_CONNECTION_ID; + rcu_read_lock(); + QLIST_FOREACH_RCU(handler, &event_flag_handlers, link) { + if (handler->conn_id == param) { + event_notifier_set(handler->notifier); + ret = 0; + break; + } + } + rcu_read_unlock(); + return ret; +} |