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x-sender="postmaster@mail.citrix.com"; x-conformance=sidf_compatible IronPort-SDR: JR+eR7ViY7qRP2OcH3NO3hK9tS1Tg6nXawQvB7pU2Bj3QHKO57fYArKTMK5F3ZowaaL5k/d0iQ cUPmJMEVaGix/fBiZaBiDeENbl1WjAITM07iD7XM+rjrsdaATl74V975tZFDwZ/ib4xK44P7x+ hCI0LY7WAFZmWdh4PDOnDaJEzXjhXOnP2NIQEWmPkLRHWp1HfRjE+tnRFZOWUeqayA+BVOoR2Q iLGr8TiZGL2/GG9WzpTPzEmzxBj1zoIKvtvB7XgwxBpMtN3n7O94HgAi2JhGFWaFw6t0acyAnM dbM= X-SBRS: 2.7 X-MesageID: 7801960 X-Ironport-Server: esa6.hc3370-68.iphmx.com X-Remote-IP: 162.221.158.21 X-Policy: $RELAYED X-IronPort-AV: E=Sophos;i="5.68,229,1569297600"; d="scan'208";a="7801960" From: Anthony PERARD To: Date: Fri, 25 Oct 2019 18:05:03 +0100 Message-ID: <20191025170505.2834957-3-anthony.perard@citrix.com> X-Mailer: git-send-email 2.23.0 In-Reply-To: <20191025170505.2834957-1-anthony.perard@citrix.com> References: <20191025170505.2834957-1-anthony.perard@citrix.com> MIME-Version: 1.0 Subject: [Xen-devel] [RFC XEN PATCH for-4.13 2/4] libxl: Introduce libxl__ev_qmplock X-BeenThere: xen-devel@lists.xenproject.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: Xen developer discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Cc: Anthony PERARD , Ian Jackson , Wei Liu Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Errors-To: xen-devel-bounces@lists.xenproject.org Sender: "Xen-devel" X-ZohoMail-DKIM: fail (Header signature does not verify) This lock will be used to prevent concurrent access the QEMU's QMP socket. It is based on libxl__ev_devlock implementation and have the same properties. There is one addition to the ev_devlock API, libxl__ev_qmplock_dispose, which allow to cancel the lock operation while it is in Active state. Signed-off-by: Anthony PERARD --- tools/libxl/libxl_internal.c | 31 ++++++++++++++++++++++++++++++- tools/libxl/libxl_internal.h | 14 ++++++++++++++ 2 files changed, 44 insertions(+), 1 deletion(-) diff --git a/tools/libxl/libxl_internal.c b/tools/libxl/libxl_internal.c index 0750b69cba61..afbb01c5722f 100644 --- a/tools/libxl/libxl_internal.c +++ b/tools/libxl/libxl_internal.c @@ -583,17 +583,25 @@ void libxl__ev_devlock_init(libxl__ev_devlock *lock) lock->held =3D false; } =20 +static void ev_lock_lock(libxl__egc *egc, libxl__ev_devlock *lock, + const char *userdata_userid); static void ev_lock_prepare_fork(libxl__egc *egc, libxl__ev_devlock *lock); static void ev_lock_child_callback(libxl__egc *egc, libxl__ev_child *child, pid_t pid, int status); =20 void libxl__ev_devlock_lock(libxl__egc *egc, libxl__ev_devlock *lock) +{ + ev_lock_lock(egc, lock, "libxl-device-changes-lock"); +} + +static void ev_lock_lock(libxl__egc *egc, libxl__ev_devlock *lock, + const char *userdata_userid) { STATE_AO_GC(lock->ao); const char *lockfile; =20 lockfile =3D libxl__userdata_path(gc, lock->domid, - "libxl-device-changes-lock", "l"); + userdata_userid, "l"); if (!lockfile) goto out; lock->path =3D libxl__strdup(NOGC, lockfile); =20 @@ -757,6 +765,27 @@ void libxl__ev_devlock_unlock(libxl__gc *gc, libxl__ev= _devlock *lock) libxl__ev_devlock_init(lock); } =20 +void libxl__ev_qmplock_init(libxl__ev_qmplock *lock) +{ + libxl__ev_devlock_init(lock); +} + +void libxl__ev_qmplock_lock(libxl__egc *egc, libxl__ev_qmplock *lock) +{ + ev_lock_lock(egc, lock, "qmp-socket-lock"); +} + +void libxl__ev_qmplock_unlock(libxl__gc *gc, libxl__ev_qmplock *lock) +{ + libxl__ev_devlock_unlock(gc, lock); +} + +void libxl__ev_qmplock_dispose(libxl__gc *gc, libxl__ev_qmplock *lock) +{ + libxl__ev_child_kill(lock->ao, &lock->child); + libxl__ev_devlock_unlock(gc, lock); +} + /* * Local variables: * mode: C diff --git a/tools/libxl/libxl_internal.h b/tools/libxl/libxl_internal.h index 5823890703ad..115c79d034d4 100644 --- a/tools/libxl/libxl_internal.h +++ b/tools/libxl/libxl_internal.h @@ -197,6 +197,7 @@ typedef struct libxl__device_type libxl__device_type; typedef struct libxl__json_object libxl__json_object; typedef struct libxl__carefd libxl__carefd; typedef struct libxl__ev_devlock libxl__ev_devlock; +typedef struct libxl__ev_devlock libxl__ev_qmplock; typedef struct libxl__dm_resume_state libxl__dm_resume_state; typedef struct libxl__ao_device libxl__ao_device; typedef struct libxl__multidev libxl__multidev; @@ -4725,6 +4726,19 @@ _hidden void libxl__ev_devlock_init(libxl__ev_devloc= k *); _hidden void libxl__ev_devlock_lock(libxl__egc *, libxl__ev_devlock *); _hidden void libxl__ev_devlock_unlock(libxl__gc *, libxl__ev_devlock *); =20 +/* libxl__ev_qmplock + * + * See "Lock for device hotplug, qmp_lock." as it is similar but is used + * to regulate access the QEMU's QMP socket. + * + * libxl__ev_qmplock_dispose: Idle/Active/LockAcquired -> Idle + * The callback will not be called anymore. + */ +_hidden void libxl__ev_qmplock_init(libxl__ev_qmplock *); +_hidden void libxl__ev_qmplock_lock(libxl__egc *, libxl__ev_qmplock *); +_hidden void libxl__ev_qmplock_unlock(libxl__gc *, libxl__ev_qmplock *); +_hidden void libxl__ev_qmplock_dispose(libxl__gc *, libxl__ev_qmplock *); + /* Send control commands over xenstore and wait for an Ack. */ _hidden int libxl__domain_pvcontrol(libxl__egc *egc, libxl__xswait_state *pvcontrol, --=20 Anthony PERARD _______________________________________________ Xen-devel mailing list Xen-devel@lists.xenproject.org https://lists.xenproject.org/mailman/listinfo/xen-devel