Commit dc7a09cf authored by Jan Kiszka's avatar Jan Kiszka Committed by Marcelo Tosatti

Expose thread_id in info cpus

Based on patch by Glauber Costa:

To allow management applications like libvirt to apply CPU affinities to
the VCPU threads, expose their ID via info cpus. This patch provides the
pre-existing and used interface from qemu-kvm.
Signed-off-by: default avatarJan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: default avatarMarcelo Tosatti <mtosatti@redhat.com>
parent f2574737
......@@ -203,6 +203,7 @@ typedef struct CPUWatchpoint {
int nr_cores; /* number of cores within this CPU package */ \
int nr_threads;/* number of threads within this CPU */ \
int running; /* Nonzero if cpu is currently running(usermode). */ \
int thread_id; \
/* user data */ \
void *opaque; \
\
......
......@@ -776,6 +776,7 @@ static void *qemu_kvm_cpu_thread_fn(void *arg)
qemu_mutex_lock(&qemu_global_mutex);
qemu_thread_get_self(env->thread);
env->thread_id = qemu_get_thread_id();
r = kvm_init_vcpu(env);
if (r < 0) {
......@@ -817,6 +818,7 @@ static void *qemu_tcg_cpu_thread_fn(void *arg)
/* signal CPU creation */
qemu_mutex_lock(&qemu_global_mutex);
for (env = first_cpu; env != NULL; env = env->next_cpu) {
env->thread_id = qemu_get_thread_id();
env->created = 1;
}
qemu_cond_signal(&qemu_cpu_cond);
......
......@@ -638,6 +638,9 @@ void cpu_exec_init(CPUState *env)
env->numa_node = 0;
QTAILQ_INIT(&env->breakpoints);
QTAILQ_INIT(&env->watchpoints);
#ifndef CONFIG_USER_ONLY
env->thread_id = qemu_get_thread_id();
#endif
*penv = env;
#if defined(CONFIG_USER_ONLY)
cpu_list_unlock();
......
......@@ -897,6 +897,9 @@ static void print_cpu_iter(QObject *obj, void *opaque)
monitor_printf(mon, " (halted)");
}
monitor_printf(mon, " thread_id=%" PRId64 " ",
qdict_get_int(cpu, "thread_id"));
monitor_printf(mon, "\n");
}
......@@ -941,6 +944,7 @@ static void do_info_cpus(Monitor *mon, QObject **ret_data)
#elif defined(TARGET_MIPS)
qdict_put(cpu, "PC", qint_from_int(env->active_tc.PC));
#endif
qdict_put(cpu, "thread_id", qint_from_int(env->thread_id));
qlist_append(cpu_list, cpu);
}
......
......@@ -41,6 +41,7 @@
#ifdef CONFIG_LINUX
#include <sys/prctl.h>
#include <sys/syscall.h>
#endif
#ifdef CONFIG_EVENTFD
......@@ -382,3 +383,12 @@ int qemu_create_pidfile(const char *filename)
return 0;
}
int qemu_get_thread_id(void)
{
#if defined (__linux__)
return syscall(SYS_gettid);
#else
return getpid();
#endif
}
......@@ -266,3 +266,8 @@ int qemu_create_pidfile(const char *filename)
}
return 0;
}
int qemu_get_thread_id(void)
{
return GetCurrentThreadId();
}
......@@ -130,5 +130,6 @@ void qemu_vfree(void *ptr);
int qemu_madvise(void *addr, size_t len, int advice);
int qemu_create_pidfile(const char *filename);
int qemu_get_thread_id(void);
#endif
......@@ -1194,6 +1194,7 @@ Return a json-array. Each CPU is represented by a json-object, which contains:
"nip": PPC (json-int)
"pc" and "npc": sparc (json-int)
"PC": mips (json-int)
- "thread_id": ID of the underlying host thread (json-int)
Example:
......@@ -1205,12 +1206,14 @@ Example:
"current":true,
"halted":false,
"pc":3227107138
"thread_id":3134
},
{
"CPU":1,
"current":false,
"halted":true,
"pc":7108165
"thread_id":3135
}
]
}
......
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