cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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firmware.c (1012B)

      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		static_branch_enable(&kvm_guest);
     36
     37	of_node_put(hyper_node);
     38	return 0;
     39}
     40core_initcall(check_kvm_guest); // before kvm_guest_init()
     41#endif