From a783f8ad4ec9a81f45947768b0912dd46c55c929 Mon Sep 17 00:00:00 2001 From: Paul Durrant Date: Tue, 8 Jan 2019 14:49:00 +0000 Subject: xen: add a mechanism to automatically create XenDevice-s... ...that maintains compatibility with existing Xen toolstacks. Xen toolstacks instantiate PV backends by simply writing information into xenstore and expecting a backend implementation to be watching for this. This patch adds a new 'xen-backend' module to allow individual XenDevice implementations to register create and destroy functions. The creator will be called when a tool-stack instantiates a new backend in this way, and the destructor will then be called after the resulting XenDevice object is unrealized. To support this it is also necessary to add new watchers into the XenBus implementation to handle enumeration of new backends and also destruction of XenDevice-s when the toolstack sets the backend 'online' key to 0. NOTE: This patch only adds the framework. A subsequent patch will add a creator function for xen-block devices. Signed-off-by: Paul Durrant Reviewed-by: Anthony Perard Signed-off-by: Anthony PERARD --- include/qemu/module.h | 3 +++ 1 file changed, 3 insertions(+) (limited to 'include/qemu/module.h') diff --git a/include/qemu/module.h b/include/qemu/module.h index 54300ab6e5..55dd2beea8 100644 --- a/include/qemu/module.h +++ b/include/qemu/module.h @@ -44,6 +44,7 @@ typedef enum { MODULE_INIT_OPTS, MODULE_INIT_QOM, MODULE_INIT_TRACE, + MODULE_INIT_XEN_BACKEND, MODULE_INIT_MAX } module_init_type; @@ -51,6 +52,8 @@ typedef enum { #define opts_init(function) module_init(function, MODULE_INIT_OPTS) #define type_init(function) module_init(function, MODULE_INIT_QOM) #define trace_init(function) module_init(function, MODULE_INIT_TRACE) +#define xen_backend_init(function) module_init(function, \ + MODULE_INIT_XEN_BACKEND) #define block_module_load_one(lib) module_load_one("block-", lib) #define ui_module_load_one(lib) module_load_one("ui-", lib) -- cgit v1.2.3-55-g7522