mirror of
https://github.com/Motorhead1991/qemu.git
synced 2025-08-06 01:03:55 -06:00
xen: create xenstore areas for XenDevice-s
This patch adds a new source module, xen-bus-helper.c, which builds on
basic libxenstore primitives to provide functions to create (setting
permissions appropriately) and destroy xenstore areas, and functions to
'printf' and 'scanf' nodes therein. The main xen-bus code then uses
these primitives [1] to initialize and destroy the frontend and backend
areas for a XenDevice during realize and unrealize respectively.
The 'xen-block' implementation is extended with a 'get_name' method that
returns the VBD number. This number is required to 'name' the xenstore
areas.
NOTE: An exit handler is also added to make sure the xenstore areas are
cleaned up if QEMU terminates without devices being unrealized.
[1] The 'scanf' functions are actually not yet needed, but they will be
needed by code delivered in subsequent patches.
Signed-off-by: Paul Durrant <paul.durrant@citrix.com>
Reviewed-by: Anthony Perard <anthony.perard@citrix.com>
Signed-off-by: Anthony PERARD <anthony.perard@citrix.com>
This commit is contained in:
Paul Durrant
Anthony PERARD
parent
1a72d9ae31
commit
094a22399f
7 changed files with 540 additions and 5 deletions
321
hw/xen/xen-bus.c
321
hw/xen/xen-bus.c
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@ -8,24 +8,102 @@
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#include "qemu/osdep.h"
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#include "hw/hw.h"
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#include "hw/sysbus.h"
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#include "hw/xen/xen.h"
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#include "hw/xen/xen-bus.h"
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#include "hw/xen/xen-bus-helper.h"
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#include "monitor/monitor.h"
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#include "qapi/error.h"
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#include "sysemu/sysemu.h"
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#include "trace.h"
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static char *xen_device_get_backend_path(XenDevice *xendev)
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{
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XenBus *xenbus = XEN_BUS(qdev_get_parent_bus(DEVICE(xendev)));
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XenDeviceClass *xendev_class = XEN_DEVICE_GET_CLASS(xendev);
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const char *type = object_get_typename(OBJECT(xendev));
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const char *backend = xendev_class->backend;
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if (!backend) {
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backend = type;
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}
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return g_strdup_printf("/local/domain/%u/backend/%s/%u/%s",
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xenbus->backend_id, backend, xendev->frontend_id,
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xendev->name);
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}
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static char *xen_device_get_frontend_path(XenDevice *xendev)
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{
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XenDeviceClass *xendev_class = XEN_DEVICE_GET_CLASS(xendev);
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const char *type = object_get_typename(OBJECT(xendev));
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const char *device = xendev_class->device;
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if (!device) {
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device = type;
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}
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return g_strdup_printf("/local/domain/%u/device/%s/%s",
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xendev->frontend_id, device, xendev->name);
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}
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static void xen_bus_print_dev(Monitor *mon, DeviceState *dev, int indent)
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{
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XenDevice *xendev = XEN_DEVICE(dev);
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monitor_printf(mon, "%*sname = '%s' frontend_id = %u\n",
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indent, "", xendev->name, xendev->frontend_id);
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}
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static char *xen_bus_get_dev_path(DeviceState *dev)
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{
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return xen_device_get_backend_path(XEN_DEVICE(dev));
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}
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static void xen_bus_unrealize(BusState *bus, Error **errp)
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{
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XenBus *xenbus = XEN_BUS(bus);
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trace_xen_bus_unrealize();
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if (!xenbus->xsh) {
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return;
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}
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xs_close(xenbus->xsh);
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}
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static void xen_bus_realize(BusState *bus, Error **errp)
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{
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XenBus *xenbus = XEN_BUS(bus);
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unsigned int domid;
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trace_xen_bus_realize();
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xenbus->xsh = xs_open(0);
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if (!xenbus->xsh) {
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error_setg_errno(errp, errno, "failed xs_open");
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goto fail;
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}
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if (xs_node_scanf(xenbus->xsh, XBT_NULL, "", /* domain root node */
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"domid", NULL, "%u", &domid) == 1) {
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xenbus->backend_id = domid;
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} else {
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xenbus->backend_id = 0; /* Assume lack of node means dom0 */
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}
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return;
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fail:
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xen_bus_unrealize(bus, &error_abort);
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}
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static void xen_bus_class_init(ObjectClass *class, void *data)
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{
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BusClass *bus_class = BUS_CLASS(class);
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bus_class->print_dev = xen_bus_print_dev;
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bus_class->get_dev_path = xen_bus_get_dev_path;
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bus_class->realize = xen_bus_realize;
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bus_class->unrealize = xen_bus_unrealize;
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}
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@ -42,27 +120,241 @@ static const TypeInfo xen_bus_type_info = {
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},
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};
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static void xen_device_backend_printf(XenDevice *xendev, const char *key,
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const char *fmt, ...)
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{
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XenBus *xenbus = XEN_BUS(qdev_get_parent_bus(DEVICE(xendev)));
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Error *local_err = NULL;
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va_list ap;
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g_assert(xenbus->xsh);
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va_start(ap, fmt);
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xs_node_vprintf(xenbus->xsh, XBT_NULL, xendev->backend_path, key,
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&local_err, fmt, ap);
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va_end(ap);
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if (local_err) {
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error_report_err(local_err);
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}
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}
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static void xen_device_backend_set_state(XenDevice *xendev,
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enum xenbus_state state)
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{
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const char *type = object_get_typename(OBJECT(xendev));
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if (xendev->backend_state == state) {
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return;
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}
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trace_xen_device_backend_state(type, xendev->name,
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xs_strstate(state));
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xendev->backend_state = state;
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xen_device_backend_printf(xendev, "state", "%u", state);
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}
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static void xen_device_backend_create(XenDevice *xendev, Error **errp)
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{
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XenBus *xenbus = XEN_BUS(qdev_get_parent_bus(DEVICE(xendev)));
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struct xs_permissions perms[2];
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Error *local_err = NULL;
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xendev->backend_path = xen_device_get_backend_path(xendev);
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perms[0].id = xenbus->backend_id;
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perms[0].perms = XS_PERM_NONE;
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perms[1].id = xendev->frontend_id;
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perms[1].perms = XS_PERM_READ;
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g_assert(xenbus->xsh);
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xs_node_create(xenbus->xsh, XBT_NULL, xendev->backend_path, perms,
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ARRAY_SIZE(perms), &local_err);
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if (local_err) {
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error_propagate_prepend(errp, local_err,
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"failed to create backend: ");
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}
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}
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static void xen_device_backend_destroy(XenDevice *xendev)
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{
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XenBus *xenbus = XEN_BUS(qdev_get_parent_bus(DEVICE(xendev)));
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Error *local_err = NULL;
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if (!xendev->backend_path) {
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return;
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}
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g_assert(xenbus->xsh);
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xs_node_destroy(xenbus->xsh, XBT_NULL, xendev->backend_path,
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&local_err);
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g_free(xendev->backend_path);
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xendev->backend_path = NULL;
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if (local_err) {
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error_report_err(local_err);
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}
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}
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static void xen_device_frontend_printf(XenDevice *xendev, const char *key,
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const char *fmt, ...)
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{
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XenBus *xenbus = XEN_BUS(qdev_get_parent_bus(DEVICE(xendev)));
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Error *local_err = NULL;
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va_list ap;
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g_assert(xenbus->xsh);
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va_start(ap, fmt);
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xs_node_vprintf(xenbus->xsh, XBT_NULL, xendev->frontend_path, key,
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&local_err, fmt, ap);
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va_end(ap);
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if (local_err) {
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error_report_err(local_err);
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}
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}
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static void xen_device_frontend_set_state(XenDevice *xendev,
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enum xenbus_state state)
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{
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const char *type = object_get_typename(OBJECT(xendev));
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if (xendev->frontend_state == state) {
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return;
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}
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trace_xen_device_frontend_state(type, xendev->name,
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xs_strstate(state));
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xendev->frontend_state = state;
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xen_device_frontend_printf(xendev, "state", "%u", state);
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}
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static void xen_device_frontend_create(XenDevice *xendev, Error **errp)
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{
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XenBus *xenbus = XEN_BUS(qdev_get_parent_bus(DEVICE(xendev)));
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struct xs_permissions perms[2];
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Error *local_err = NULL;
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xendev->frontend_path = xen_device_get_frontend_path(xendev);
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perms[0].id = xendev->frontend_id;
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perms[0].perms = XS_PERM_NONE;
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perms[1].id = xenbus->backend_id;
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perms[1].perms = XS_PERM_READ | XS_PERM_WRITE;
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g_assert(xenbus->xsh);
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xs_node_create(xenbus->xsh, XBT_NULL, xendev->frontend_path, perms,
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ARRAY_SIZE(perms), &local_err);
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if (local_err) {
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error_propagate_prepend(errp, local_err,
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"failed to create frontend: ");
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}
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}
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static void xen_device_frontend_destroy(XenDevice *xendev)
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{
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XenBus *xenbus = XEN_BUS(qdev_get_parent_bus(DEVICE(xendev)));
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Error *local_err = NULL;
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if (!xendev->frontend_path) {
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return;
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}
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g_assert(xenbus->xsh);
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xs_node_destroy(xenbus->xsh, XBT_NULL, xendev->frontend_path,
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&local_err);
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g_free(xendev->frontend_path);
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xendev->frontend_path = NULL;
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if (local_err) {
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error_report_err(local_err);
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}
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}
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static void xen_device_unrealize(DeviceState *dev, Error **errp)
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{
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XenDevice *xendev = XEN_DEVICE(dev);
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XenDeviceClass *xendev_class = XEN_DEVICE_GET_CLASS(xendev);
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const char *type = object_get_typename(OBJECT(xendev));
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trace_xen_device_unrealize(type);
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if (!xendev->name) {
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return;
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}
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trace_xen_device_unrealize(type, xendev->name);
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if (xendev->exit.notify) {
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qemu_remove_exit_notifier(&xendev->exit);
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xendev->exit.notify = NULL;
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}
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if (xendev_class->unrealize) {
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xendev_class->unrealize(xendev, errp);
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}
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xen_device_frontend_destroy(xendev);
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xen_device_backend_destroy(xendev);
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g_free(xendev->name);
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xendev->name = NULL;
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}
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static void xen_device_exit(Notifier *n, void *data)
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{
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XenDevice *xendev = container_of(n, XenDevice, exit);
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xen_device_unrealize(DEVICE(xendev), &error_abort);
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}
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static void xen_device_realize(DeviceState *dev, Error **errp)
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{
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XenDevice *xendev = XEN_DEVICE(dev);
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XenDeviceClass *xendev_class = XEN_DEVICE_GET_CLASS(xendev);
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XenBus *xenbus = XEN_BUS(qdev_get_parent_bus(DEVICE(xendev)));
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const char *type = object_get_typename(OBJECT(xendev));
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Error *local_err = NULL;
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trace_xen_device_realize(type);
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if (xendev->frontend_id == DOMID_INVALID) {
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xendev->frontend_id = xen_domid;
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}
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if (xendev->frontend_id >= DOMID_FIRST_RESERVED) {
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error_setg(errp, "invalid frontend-id");
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goto unrealize;
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}
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if (!xendev_class->get_name) {
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error_setg(errp, "get_name method not implemented");
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goto unrealize;
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}
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xendev->name = xendev_class->get_name(xendev, &local_err);
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if (local_err) {
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error_propagate_prepend(errp, local_err,
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"failed to get device name: ");
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goto unrealize;
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}
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trace_xen_device_realize(type, xendev->name);
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xen_device_backend_create(xendev, &local_err);
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if (local_err) {
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error_propagate(errp, local_err);
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goto unrealize;
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}
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xen_device_frontend_create(xendev, &local_err);
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if (local_err) {
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error_propagate(errp, local_err);
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goto unrealize;
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}
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if (xendev_class->realize) {
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xendev_class->realize(xendev, &local_err);
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@ -72,18 +364,43 @@ static void xen_device_realize(DeviceState *dev, Error **errp)
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}
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}
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xen_device_backend_printf(xendev, "frontend", "%s",
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xendev->frontend_path);
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xen_device_backend_printf(xendev, "frontend-id", "%u",
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xendev->frontend_id);
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xen_device_backend_printf(xendev, "online", "%u", 1);
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xen_device_backend_printf(xendev, "hotplug-status", "connected");
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xen_device_backend_set_state(xendev, XenbusStateInitWait);
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xen_device_frontend_printf(xendev, "backend", "%s",
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xendev->backend_path);
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xen_device_frontend_printf(xendev, "backend-id", "%u",
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xenbus->backend_id);
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xen_device_frontend_set_state(xendev, XenbusStateInitialising);
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xendev->exit.notify = xen_device_exit;
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qemu_add_exit_notifier(&xendev->exit);
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return;
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unrealize:
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xen_device_unrealize(dev, &error_abort);
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}
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static Property xen_device_props[] = {
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DEFINE_PROP_UINT16("frontend-id", XenDevice, frontend_id,
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DOMID_INVALID),
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DEFINE_PROP_END_OF_LIST()
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};
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static void xen_device_class_init(ObjectClass *class, void *data)
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{
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DeviceClass *dev_class = DEVICE_CLASS(class);
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dev_class->realize = xen_device_realize;
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dev_class->unrealize = xen_device_unrealize;
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dev_class->props = xen_device_props;
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dev_class->bus_type = TYPE_XEN_BUS;
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}
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