From mboxrd@z Thu Jan 1 00:00:00 1970 From: Wen Congyang Subject: [PATCH v10 01/31] tools/libxl: introduce libxl__domain_restore_device_model to load qemu state Date: Mon, 22 Feb 2016 10:52:05 +0800 Message-ID: <1456109555-28299-2-git-send-email-wency@cn.fujitsu.com> References: <1456109555-28299-1-git-send-email-wency@cn.fujitsu.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <1456109555-28299-1-git-send-email-wency@cn.fujitsu.com> List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Sender: xen-devel-bounces@lists.xen.org Errors-To: xen-devel-bounces@lists.xen.org To: xen devel , Konrad Rzeszutek Wilk , Andrew Cooper , Ian Campbell , Ian Jackson , Wei Liu Cc: Lars Kurth , Changlong Xie , Wen Congyang , Gui Jianfeng , Jiang Yunhong , Dong Eddie , Anthony Perard , Shriram Rajagopalan , Yang Hongyang List-Id: xen-devel@lists.xenproject.org In normal migration, the qemu state is passed to qemu as a parameter. With COLO, secondary vm is running. So we will do the following steps at every checkpoint: 1. suspend both primary vm and secondary vm 2. sync the state 3. resume both primary vm and secondary vm Primary will send qemu's state in step2, and secondary's qemu should read it and restore the state before it is resumed. We can not pass the state to qemu as a parameter because secondary QEMU already started at this point, so we introduce libxl__domain_restore_device_model() to do it. This API MUST be called before resuming secondary vm. Signed-off-by: Yang Hongyang Signed-off-by: Wen Congyang Cc: Anthony Perard Reviewed-by: Konrad Rzeszutek Wilk --- tools/libxl/libxl_dom_save.c | 20 ++++++++++++++++++++ tools/libxl/libxl_internal.h | 4 ++++ tools/libxl/libxl_qmp.c | 10 ++++++++++ 3 files changed, 34 insertions(+) diff --git a/tools/libxl/libxl_dom_save.c b/tools/libxl/libxl_dom_save.c index 4eb7960..7d345f9 100644 --- a/tools/libxl/libxl_dom_save.c +++ b/tools/libxl/libxl_dom_save.c @@ -512,6 +512,26 @@ int libxl__restore_emulator_xenstore_data(libxl__domain_create_state *dcs, return rc; } +int libxl__domain_restore_device_model(libxl__gc *gc, uint32_t domid, + const char *restore_file) +{ + int rc; + + switch (libxl__device_model_version_running(gc, domid)) { + case LIBXL_DEVICE_MODEL_VERSION_QEMU_XEN_TRADITIONAL: + /* Will never be supported. */ + rc = ERROR_INVAL; + break; + case LIBXL_DEVICE_MODEL_VERSION_QEMU_XEN: + rc = libxl__qmp_restore(gc, domid, restore_file); + break; + default: + rc = ERROR_INVAL; + } + + return rc; +} + /* * Local variables: * mode: C diff --git a/tools/libxl/libxl_internal.h b/tools/libxl/libxl_internal.h index a1aae97..5320e5e 100644 --- a/tools/libxl/libxl_internal.h +++ b/tools/libxl/libxl_internal.h @@ -1119,6 +1119,8 @@ _hidden int libxl__domain_rename(libxl__gc *gc, uint32_t domid, const char *old_name, const char *new_name, xs_transaction_t trans); +_hidden int libxl__domain_restore_device_model(libxl__gc *gc, uint32_t domid, + const char *restore_file); _hidden int libxl__domain_resume_device_model(libxl__gc *gc, uint32_t domid); _hidden const char *libxl__userdata_path(libxl__gc *gc, uint32_t domid, @@ -1762,6 +1764,8 @@ _hidden int libxl__qmp_stop(libxl__gc *gc, int domid); _hidden int libxl__qmp_resume(libxl__gc *gc, int domid); /* Save current QEMU state into fd. */ _hidden int libxl__qmp_save(libxl__gc *gc, int domid, const char *filename); +/* Load current QEMU state from file. */ +_hidden int libxl__qmp_restore(libxl__gc *gc, int domid, const char *filename); /* Set dirty bitmap logging status */ _hidden int libxl__qmp_set_global_dirty_log(libxl__gc *gc, int domid, bool enable); _hidden int libxl__qmp_insert_cdrom(libxl__gc *gc, int domid, const libxl_device_disk *disk); diff --git a/tools/libxl/libxl_qmp.c b/tools/libxl/libxl_qmp.c index 714038b..eec8a44 100644 --- a/tools/libxl/libxl_qmp.c +++ b/tools/libxl/libxl_qmp.c @@ -905,6 +905,16 @@ int libxl__qmp_save(libxl__gc *gc, int domid, const char *filename) NULL, NULL); } +int libxl__qmp_restore(libxl__gc *gc, int domid, const char *state_file) +{ + libxl__json_object *args = NULL; + + qmp_parameters_add_string(gc, &args, "filename", state_file); + + return qmp_run_command(gc, domid, "xen-load-devices-state", args, + NULL, NULL); +} + static int qmp_change(libxl__gc *gc, libxl__qmp_handler *qmp, char *device, char *target, char *arg) { -- 2.5.0