add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/arch/powerpc/kernel/firmware.c
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+// SPDX-License-Identifier: GPL-2.0-or-later
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 /*
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  *  Extracted from cputable.c
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  *
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@@ -6,17 +7,35 @@
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  *  Modifications for ppc64:
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  *      Copyright (C) 2003 Dave Engebretsen <engebret@us.ibm.com>
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  *  Copyright (C) 2005 Stephen Rothwell, IBM Corporation
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- *
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- *  This program is free software; you can redistribute it and/or
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- *  modify it under the terms of the GNU General Public License
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- *  as published by the Free Software Foundation; either version
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- *  2 of the License, or (at your option) any later version.
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  */
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 #include <linux/export.h>
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 #include <linux/cache.h>
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+#include <linux/of.h>
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 #include <asm/firmware.h>
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+#include <asm/kvm_guest.h>
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+#ifdef CONFIG_PPC64
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 unsigned long powerpc_firmware_features __read_mostly;
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 EXPORT_SYMBOL_GPL(powerpc_firmware_features);
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+#endif
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+
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+#if defined(CONFIG_PPC_PSERIES) || defined(CONFIG_KVM_GUEST)
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+DEFINE_STATIC_KEY_FALSE(kvm_guest);
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+int __init check_kvm_guest(void)
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+{
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+	struct device_node *hyper_node;
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+
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+	hyper_node = of_find_node_by_path("/hypervisor");
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+	if (!hyper_node)
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+		return 0;
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+
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+	if (of_device_is_compatible(hyper_node, "linux,kvm"))
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+		static_branch_enable(&kvm_guest);
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+
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+	of_node_put(hyper_node);
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+	return 0;
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+}
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+core_initcall(check_kvm_guest); // before kvm_guest_init()
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+#endif