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x-conformance=sidf_compatible IronPort-SDR: kzI2M3RltwuAuq1PaIi+j7B2GjE6Viiqil/0AlhgaAI/PDU7bA2+Mmnz6dRyPaTwv9L0a2h4qb +Geqg4hvU0rGcxsD2zlmw61Q0WcRF7FOZ4lxrSTUg+Z7us3hIExh5TzUkIStpmeIdnkJ7N4a7c WEUhAL4rJcSkH/8R9p9L0bsYxkWqidKnleVRjXuDc0+thN0iThAhXAIL1xB8KOWPj3dThzXNZ4 3wpNLXyDns28YXtDqFzMG/6bLjuA79KmSP3N31Aut4QRiFEbswHQs3oque+aWXtvSuapsvF39C ocI= X-SBRS: 2.7 X-MesageID: 5522407 X-Ironport-Server: esa2.hc3370-68.iphmx.com X-Remote-IP: 162.221.158.21 X-Policy: $RELAYED X-IronPort-AV: E=Sophos;i="5.64,500,1559534400"; d="scan'208";a="5522407" From: Paul Durrant To: , Date: Fri, 13 Sep 2019 09:20:42 +0100 Message-ID: <20190913082043.31288-3-paul.durrant@citrix.com> X-Mailer: git-send-email 2.20.1.2.gb21ebb6 In-Reply-To: <20190913082043.31288-1-paul.durrant@citrix.com> References: <20190913082043.31288-1-paul.durrant@citrix.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-detected-operating-system: by eggs.gnu.org: FreeBSD 9.x X-Received-From: 216.71.145.153 Subject: [Qemu-devel] [PATCH v3 2/3] xen: introduce separate XenWatchList for XenDevice objects X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Anthony Perard , Paul Durrant , Stefano Stabellini Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: fail (Header signature does not verify) Content-Type: text/plain; charset="utf-8" This patch uses the XenWatchList abstraction to add a separate watch list for each device. This is more scalable than walking a single notifier list for all watches and is also necessary to implement a bug-fix in a subsequent patch. Signed-off-by: Paul Durrant Reviewed-by: Anthony Perard --- Cc: Stefano Stabellini --- hw/xen/trace-events | 2 ++ hw/xen/xen-bus.c | 72 ++++++++++++++++++++++++++++++++-------- include/hw/xen/xen-bus.h | 2 ++ 3 files changed, 62 insertions(+), 14 deletions(-) diff --git a/hw/xen/trace-events b/hw/xen/trace-events index ac8d9c20d2..80ce3dafad 100644 --- a/hw/xen/trace-events +++ b/hw/xen/trace-events @@ -29,6 +29,8 @@ xen_device_backend_changed(const char *type, char *name) = "type: %s name: %s" xen_device_frontend_state(const char *type, char *name, const char *state)= "type: %s name: %s -> %s" xen_device_frontend_changed(const char *type, char *name) "type: %s name: = %s" xen_device_unplug(const char *type, char *name) "type: %s name: %s" +xen_device_add_watch(const char *type, char *name, const char *node, const= char *key) "type: %s name: %s node: %s key: %s" +xen_device_remove_watch(const char *type, char *name, const char *node, co= nst char *key) "type: %s name: %s node: %s key: %s" =20 # xen-bus-helper.c xs_node_create(const char *node) "%s" diff --git a/hw/xen/xen-bus.c b/hw/xen/xen-bus.c index 28efaccff2..810a4e2df3 100644 --- a/hw/xen/xen-bus.c +++ b/hw/xen/xen-bus.c @@ -235,11 +235,11 @@ static void watch_list_remove(XenWatchList *watch_lis= t, XenWatch *watch, =20 static XenWatch *xen_bus_add_watch(XenBus *xenbus, const char *node, const char *key, XenWatchHandler handle= r, - void *opaque, Error **errp) + Error **errp) { trace_xen_bus_add_watch(node, key); =20 - return watch_list_add(xenbus->watch_list, node, key, handler, opaque, + return watch_list_add(xenbus->watch_list, node, key, handler, xenbus, errp); } =20 @@ -433,7 +433,7 @@ static void xen_bus_realize(BusState *bus, Error **errp) =20 xenbus->backend_watch =3D xen_bus_add_watch(xenbus, "", /* domain root node */ - "backend", xen_bus_enumerate, xenbus, &local_err= ); + "backend", xen_bus_enumerate, &local_err); if (local_err) { /* This need not be treated as a hard error so don't propagate */ error_reportf_err(local_err, @@ -621,6 +621,31 @@ static void xen_device_backend_changed(void *opaque) } } =20 +static XenWatch *xen_device_add_watch(XenDevice *xendev, const char *node, + const char *key, + XenWatchHandler handler, + Error **errp) +{ + const char *type =3D object_get_typename(OBJECT(xendev)); + + trace_xen_device_add_watch(type, xendev->name, node, key); + + return watch_list_add(xendev->watch_list, node, key, handler, xendev, + errp); +} + +static void xen_device_remove_watch(XenDevice *xendev, XenWatch *watch, + Error **errp) +{ + const char *type =3D object_get_typename(OBJECT(xendev)); + + trace_xen_device_remove_watch(type, xendev->name, watch->node, + watch->key); + + watch_list_remove(xendev->watch_list, watch, errp); +} + + static void xen_device_backend_create(XenDevice *xendev, Error **errp) { XenBus *xenbus =3D XEN_BUS(qdev_get_parent_bus(DEVICE(xendev))); @@ -645,9 +670,9 @@ static void xen_device_backend_create(XenDevice *xendev= , Error **errp) } =20 xendev->backend_state_watch =3D - xen_bus_add_watch(xenbus, xendev->backend_path, - "state", xen_device_backend_changed, - xendev, &local_err); + xen_device_add_watch(xendev, xendev->backend_path, + "state", xen_device_backend_changed, + &local_err); if (local_err) { error_propagate_prepend(errp, local_err, "failed to watch backend state: "); @@ -655,9 +680,9 @@ static void xen_device_backend_create(XenDevice *xendev= , Error **errp) } =20 xendev->backend_online_watch =3D - xen_bus_add_watch(xenbus, xendev->backend_path, - "online", xen_device_backend_changed, - xendev, &local_err); + xen_device_add_watch(xendev, xendev->backend_path, + "online", xen_device_backend_changed, + &local_err); if (local_err) { error_propagate_prepend(errp, local_err, "failed to watch backend online: "); @@ -671,12 +696,12 @@ static void xen_device_backend_destroy(XenDevice *xen= dev) Error *local_err =3D NULL; =20 if (xendev->backend_online_watch) { - xen_bus_remove_watch(xenbus, xendev->backend_online_watch, NULL); + xen_device_remove_watch(xendev, xendev->backend_online_watch, NULL= ); xendev->backend_online_watch =3D NULL; } =20 if (xendev->backend_state_watch) { - xen_bus_remove_watch(xenbus, xendev->backend_state_watch, NULL); + xen_device_remove_watch(xendev, xendev->backend_state_watch, NULL); xendev->backend_state_watch =3D NULL; } =20 @@ -812,8 +837,8 @@ static void xen_device_frontend_create(XenDevice *xende= v, Error **errp) } =20 xendev->frontend_state_watch =3D - xen_bus_add_watch(xenbus, xendev->frontend_path, "state", - xen_device_frontend_changed, xendev, &local_err); + xen_device_add_watch(xendev, xendev->frontend_path, "state", + xen_device_frontend_changed, &local_err); if (local_err) { error_propagate_prepend(errp, local_err, "failed to watch frontend state: "); @@ -826,7 +851,8 @@ static void xen_device_frontend_destroy(XenDevice *xend= ev) Error *local_err =3D NULL; =20 if (xendev->frontend_state_watch) { - xen_bus_remove_watch(xenbus, xendev->frontend_state_watch, NULL); + xen_device_remove_watch(xendev, xendev->frontend_state_watch, + NULL); xendev->frontend_state_watch =3D NULL; } =20 @@ -1122,6 +1148,16 @@ static void xen_device_unrealize(DeviceState *dev, E= rror **errp) xendev->xgth =3D NULL; } =20 + if (xendev->watch_list) { + watch_list_destroy(xendev->watch_list); + xendev->watch_list =3D NULL; + } + + if (xendev->xsh) { + xs_close(xendev->xsh); + xendev->xsh =3D NULL; + } + g_free(xendev->name); xendev->name =3D NULL; } @@ -1164,6 +1200,14 @@ static void xen_device_realize(DeviceState *dev, Err= or **errp) =20 trace_xen_device_realize(type, xendev->name); =20 + xendev->xsh =3D xs_open(0); + if (!xendev->xsh) { + error_setg_errno(errp, errno, "failed xs_open"); + goto unrealize; + } + + xendev->watch_list =3D watch_list_create(xendev->xsh); + xendev->xgth =3D xengnttab_open(NULL, 0); if (!xendev->xgth) { error_setg_errno(errp, errno, "failed xengnttab_open"); diff --git a/include/hw/xen/xen-bus.h b/include/hw/xen/xen-bus.h index 88b84e29bb..0d198148f6 100644 --- a/include/hw/xen/xen-bus.h +++ b/include/hw/xen/xen-bus.h @@ -22,6 +22,8 @@ typedef struct XenDevice { DeviceState qdev; domid_t frontend_id; char *name; + struct xs_handle *xsh; + XenWatchList *watch_list; char *backend_path, *frontend_path; enum xenbus_state backend_state, frontend_state; Notifier exit; --=20 2.20.1.2.gb21ebb6