qemu

xen-all.c (6145B)

---

 /*
  * Copyright (C) 2014       Citrix Systems UK Ltd.
  *
  * This work is licensed under the terms of the GNU GPL, version 2.  See
  * the COPYING file in the top-level directory.
  *
  * Contributions after 2012-01-13 are licensed under the terms of the
  * GNU GPL, version 2 or (at your option) any later version.
  */
 
 #include "qemu/osdep.h"
 #include "qemu/error-report.h"
 #include "qemu/module.h"
 #include "qapi/error.h"
 #include "hw/xen/xen-legacy-backend.h"
 #include "hw/xen/xen_pt.h"
 #include "chardev/char.h"
 #include "qemu/accel.h"
 #include "sysemu/cpus.h"
 #include "sysemu/xen.h"
 #include "sysemu/runstate.h"
 #include "migration/misc.h"
 #include "migration/global_state.h"
 #include "hw/boards.h"
 
 //#define DEBUG_XEN
 
 #ifdef DEBUG_XEN
 #define DPRINTF(fmt, ...) \
     do { fprintf(stderr, "xen: " fmt, ## __VA_ARGS__); } while (0)
 #else
 #define DPRINTF(fmt, ...) \
     do { } while (0)
 #endif
 
 bool xen_allowed;
 
 xc_interface *xen_xc;
 xenforeignmemory_handle *xen_fmem;
 xendevicemodel_handle *xen_dmod;
 
 static int store_dev_info(int domid, Chardev *cs, const char *string)
 {
     struct xs_handle *xs = NULL;
     char *path = NULL;
     char *newpath = NULL;
     char *pts = NULL;
     int ret = -1;
 
     /* Only continue if we're talking to a pty. */
     if (!CHARDEV_IS_PTY(cs)) {
         return 0;
     }
     pts = cs->filename + 4;
 
     /* We now have everything we need to set the xenstore entry. */
     xs = xs_open(0);
     if (xs == NULL) {
         fprintf(stderr, "Could not contact XenStore\n");
         goto out;
     }
 
     path = xs_get_domain_path(xs, domid);
     if (path == NULL) {
         fprintf(stderr, "xs_get_domain_path() error\n");
         goto out;
     }
     newpath = realloc(path, (strlen(path) + strlen(string) +
                 strlen("/tty") + 1));
     if (newpath == NULL) {
         fprintf(stderr, "realloc error\n");
         goto out;
     }
     path = newpath;
 
     strcat(path, string);
     strcat(path, "/tty");
     if (!xs_write(xs, XBT_NULL, path, pts, strlen(pts))) {
         fprintf(stderr, "xs_write for '%s' fail", string);
         goto out;
     }
     ret = 0;
 
 out:
     free(path);
     xs_close(xs);
 
     return ret;
 }
 
 void xenstore_store_pv_console_info(int i, Chardev *chr)
 {
     if (i == 0) {
         store_dev_info(xen_domid, chr, "/console");
     } else {
         char buf[32];
         snprintf(buf, sizeof(buf), "/device/console/%d", i);
         store_dev_info(xen_domid, chr, buf);
     }
 }
 
 
 static void xenstore_record_dm_state(struct xs_handle *xs, const char *state)
 {
     char path[50];
 
     if (xs == NULL) {
         error_report("xenstore connection not initialized");
         exit(1);
     }
 
     snprintf(path, sizeof (path), "device-model/%u/state", xen_domid);
     /*
      * This call may fail when running restricted so don't make it fatal in
      * that case. Toolstacks should instead use QMP to listen for state changes.
      */
     if (!xs_write(xs, XBT_NULL, path, state, strlen(state)) &&
             !xen_domid_restrict) {
         error_report("error recording dm state");
         exit(1);
     }
 }
 
 
 static void xen_change_state_handler(void *opaque, bool running,
                                      RunState state)
 {
     if (running) {
         /* record state running */
         xenstore_record_dm_state(xenstore, "running");
     }
 }
 
 static bool xen_get_igd_gfx_passthru(Object *obj, Error **errp)
 {
     return xen_igd_gfx_pt_enabled();
 }
 
 static void xen_set_igd_gfx_passthru(Object *obj, bool value, Error **errp)
 {
     xen_igd_gfx_pt_set(value, errp);
 }
 
 static void xen_setup_post(MachineState *ms, AccelState *accel)
 {
     int rc;
 
     if (xen_domid_restrict) {
         rc = xen_restrict(xen_domid);
         if (rc < 0) {
             perror("xen: failed to restrict");
             exit(1);
         }
     }
 }
 
 static int xen_init(MachineState *ms)
 {
     MachineClass *mc = MACHINE_GET_CLASS(ms);
 
     xen_xc = xc_interface_open(0, 0, 0);
     if (xen_xc == NULL) {
         xen_pv_printf(NULL, 0, "can't open xen interface\n");
         return -1;
     }
     xen_fmem = xenforeignmemory_open(0, 0);
     if (xen_fmem == NULL) {
         xen_pv_printf(NULL, 0, "can't open xen fmem interface\n");
         xc_interface_close(xen_xc);
         return -1;
     }
     xen_dmod = xendevicemodel_open(0, 0);
     if (xen_dmod == NULL) {
         xen_pv_printf(NULL, 0, "can't open xen devicemodel interface\n");
         xenforeignmemory_close(xen_fmem);
         xc_interface_close(xen_xc);
         return -1;
     }
     qemu_add_vm_change_state_handler(xen_change_state_handler, NULL);
     /*
      * opt out of system RAM being allocated by generic code
      */
     mc->default_ram_id = NULL;
     return 0;
 }
 
 static void xen_accel_class_init(ObjectClass *oc, void *data)
 {
     AccelClass *ac = ACCEL_CLASS(oc);
     static GlobalProperty compat[] = {
         { "migration", "store-global-state", "off" },
         { "migration", "send-configuration", "off" },
         { "migration", "send-section-footer", "off" },
     };
 
     ac->name = "Xen";
     ac->init_machine = xen_init;
     ac->setup_post = xen_setup_post;
     ac->allowed = &xen_allowed;
     ac->compat_props = g_ptr_array_new();
 
     compat_props_add(ac->compat_props, compat, G_N_ELEMENTS(compat));
 
     object_class_property_add_bool(oc, "igd-passthru",
         xen_get_igd_gfx_passthru, xen_set_igd_gfx_passthru);
     object_class_property_set_description(oc, "igd-passthru",
         "Set on/off to enable/disable igd passthrou");
 }
 
 #define TYPE_XEN_ACCEL ACCEL_CLASS_NAME("xen")
 
 static const TypeInfo xen_accel_type = {
     .name = TYPE_XEN_ACCEL,
     .parent = TYPE_ACCEL,
     .class_init = xen_accel_class_init,
 };
 
 static void xen_accel_ops_class_init(ObjectClass *oc, void *data)
 {
     AccelOpsClass *ops = ACCEL_OPS_CLASS(oc);
 
     ops->create_vcpu_thread = dummy_start_vcpu_thread;
 }
 
 static const TypeInfo xen_accel_ops_type = {
     .name = ACCEL_OPS_NAME("xen"),
 
     .parent = TYPE_ACCEL_OPS,
     .class_init = xen_accel_ops_class_init,
     .abstract = true,
 };
 
 static void xen_type_init(void)
 {
     type_register_static(&xen_accel_type);
     type_register_static(&xen_accel_ops_type);
 }
 type_init(xen_type_init);