text: /*
   * Common hypervisor code
   *
   * Copyright (C) 2008, VMware, Inc.
   * Author : Alok N Kataria <akataria@vmware.com>
   *
   * This program is free software; you can redistribute it and/or modify
   * it under the terms of the GNU General Public License as published by
   * the Free Software Foundation; either version 2 of the License, or
   * (at your option) any later version.
   *
   * This program is distributed in the hope that it will be useful, but
   * WITHOUT ANY WARRANTY; without even the implied warranty of
   * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
   * NON INFRINGEMENT.  See the GNU General Public License for more
   * details.
   *
   * You should have received a copy of the GNU General Public License
   * along with this program; if not, write to the Free Software
   * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
   *
   */
  
  #include <linux/init.h>
  #include <linux/export.h>
  #include <asm/processor.h>
  #include <asm/hypervisor.h>
  
  static const __initconst struct hypervisor_x86 * const hypervisors[] =
  {
  #ifdef CONFIG_XEN
  	&x86_hyper_xen,
  #endif
  	&x86_hyper_vmware,
  	&x86_hyper_ms_hyperv,
  #ifdef CONFIG_KVM_GUEST
  	&x86_hyper_kvm,
  #endif
  };
  
  const struct hypervisor_x86 *x86_hyper;
  EXPORT_SYMBOL(x86_hyper);
  
  static inline void __init
  detect_hypervisor_vendor(void)
  {
  	const struct hypervisor_x86 *h, * const *p;
  	uint32_t pri, max_pri = 0;
  
  	for (p = hypervisors; p < hypervisors + ARRAY_SIZE(hypervisors); p++) {
  		h = *p;
  		pri = h->detect();
  		if (pri != 0 && pri > max_pri) {
  			max_pri = pri;
  			x86_hyper = h;
  		}
  	}
  
  	if (max_pri)
  		pr_info("Hypervisor detected: %s\n", x86_hyper->name);
  }
  
  void init_hypervisor(struct cpuinfo_x86 *c)
  {
  	if (x86_hyper && x86_hyper->set_cpu_features)
  		x86_hyper->set_cpu_features(c);
  }
  
  void __init init_hypervisor_platform(void)
  {
  
  	detect_hypervisor_vendor();
  
  	if (!x86_hyper)
  		return;
  
  	init_hypervisor(&boot_cpu_data);
  
  	if (x86_hyper->init_platform)
  		x86_hyper->init_platform();
  }
  
  bool __init hypervisor_x2apic_available(void)
  {
  	return x86_hyper                   &&
  	       x86_hyper->x2apic_available &&
  	       x86_hyper->x2apic_available();
  }
  
  void hypervisor_pin_vcpu(int cpu)
  {
  	if (!x86_hyper)
  		return;
  
  	if (x86_hyper->pin_vcpu)
  		x86_hyper->pin_vcpu(cpu);
  	else
  		WARN_ONCE(1, "vcpu pinning requested but not supported!\n");
  }
  