LXR linux/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
  20unsigned long powerpc_firmware_features __read_mostly;
  21EXPORT_SYMBOL_GPL(powerpc_firmware_features);
  22#endif
  23
  24#if defined(CONFIG_PPC_PSERIES) || defined(CONFIG_KVM_GUEST)
  25DEFINE_STATIC_KEY_FALSE(kvm_guest);
  26int __init check_kvm_guest(void)
  27{
  28        struct device_node *hyper_node;
  29
  30        hyper_node = of_find_node_by_path("/hypervisor");
  31        if (!hyper_node)
  32                return 0;
  33
  34        if (!of_device_is_compatible(hyper_node, "linux,kvm"))
  35                return 0;
  36
  37        static_branch_enable(&kvm_guest);
  38
  39        return 0;
  40}
  41core_initcall(check_kvm_guest); // before kvm_guest_init()
  42#endif
  43