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Commita21d1becaa("powerpc: Reintroduce is_kvm_guest() as a fast-path check") added is_kvm_guest() and changed kvm_para_available() to use it. is_kvm_guest() checks a static key, kvm_guest, and that static key is set in check_kvm_guest(). The problem is check_kvm_guest() is only called on pseries, and even then only in some configurations. That means is_kvm_guest() always returns false on all non-pseries and some pseries depending on configuration. That's a bug. For PR KVM guests this is noticable because they no longer do live patching of themselves, which can be detected by the omission of a message in dmesg such as: KVM: Live patching for a fast VM worked To fix it make check_kvm_guest() an initcall, to ensure it's always called at boot. It needs to be core so that it runs before kvm_guest_init() which is postcore. To be an initcall it needs to return int, where 0 means success, so update that. We still call it manually in pSeries_smp_probe(), because that runs before init calls are run. Fixes:a21d1becaa("powerpc: Reintroduce is_kvm_guest() as a fast-path check") Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20210623130514.2543232-1-mpe@ellerman.id.au
25 lines
566 B
C
25 lines
566 B
C
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* Copyright (C) 2020 IBM Corporation
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*/
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#ifndef _ASM_POWERPC_KVM_GUEST_H_
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#define _ASM_POWERPC_KVM_GUEST_H_
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#if defined(CONFIG_PPC_PSERIES) || defined(CONFIG_KVM_GUEST)
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#include <linux/jump_label.h>
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DECLARE_STATIC_KEY_FALSE(kvm_guest);
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static inline bool is_kvm_guest(void)
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{
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return static_branch_unlikely(&kvm_guest);
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}
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int check_kvm_guest(void);
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#else
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static inline bool is_kvm_guest(void) { return false; }
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static inline int check_kvm_guest(void) { return 0; }
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#endif
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#endif /* _ASM_POWERPC_KVM_GUEST_H_ */
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