arch/powerpc/kernel/firmware.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  *  Extracted from cputable.c
   4  *
   5  *  Copyright (C) 2001 Ben. Herrenschmidt (benh@kernel.crashing.org)
   6  *
   7  *  Modifications for ppc64:
   8  *      Copyright (C) 2003 Dave Engebretsen <engebret@us.ibm.com>
   9  *  Copyright (C) 2005 Stephen Rothwell, IBM Corporation
  10  */
  11
  12 #include <linux/export.h>
  13 #include <linux/cache.h>
  14 #include <linux/of.h>
  15
  16 #include <asm/firmware.h>
  17 #include <asm/kvm_guest.h>
  18
  19 #ifdef CONFIG_PPC64
  20 unsigned long powerpc_firmware_features __read_mostly;
  21 EXPORT_SYMBOL_GPL(powerpc_firmware_features);
  22 #endif
  23
  24 #if defined(CONFIG_PPC_PSERIES) || defined(CONFIG_KVM_GUEST)
  25 DEFINE_STATIC_KEY_FALSE(kvm_guest);
  26 EXPORT_SYMBOL_GPL(kvm_guest);
  27
  28 int __init check_kvm_guest(void)
  29 {
  30         struct device_node *hyper_node;
  31
  32         hyper_node = of_find_node_by_path("/hypervisor");
  33         if (!hyper_node)
  34                 return 0;
  35
  36         if (of_device_is_compatible(hyper_node, "linux,kvm"))
  37                 static_branch_enable(&kvm_guest);
  38
  39         of_node_put(hyper_node);
  40         return 0;
  41 }
  42 core_initcall(check_kvm_guest); // before kvm_guest_init()
  43 #endif