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45240b53 MJ |
1 | /* SPDX-License-Identifier: (GPL-2.0-only or LGPL-2.1-only) |
2 | * | |
3 | * wrapper/kvm-x86.h | |
4 | * | |
5 | * Copyright (C) 2022 Michael Jeanson <mjeanson@efficios.com> | |
6 | */ | |
7 | ||
8 | #ifndef _LTTNG_WRAPPER_KVM_X86_H | |
9 | #define _LTTNG_WRAPPER_KVM_X86_H | |
10 | ||
11 | #include <linux/kvm_host.h> | |
12 | #include <lttng/kernel-version.h> | |
13 | ||
14 | #if LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(5,18,0) | |
15 | ||
16 | #ifdef CONFIG_KALLSYMS_ALL | |
17 | #include <linux/kallsyms.h> | |
18 | #include <wrapper/kallsyms.h> | |
19 | ||
20 | static struct kvm_x86_ops *kvm_x86_ops_sym; | |
21 | ||
22 | static inline | |
23 | void lttng_kvm_x86_get_exit_info( | |
24 | struct kvm_vcpu *vcpu, u32 *reason, | |
25 | u64 *info1, u64 *info2, | |
26 | u32 *exit_int_info, u32 *exit_int_info_err_code) | |
27 | { | |
28 | if (!kvm_x86_ops_sym) | |
29 | kvm_x86_ops_sym = | |
30 | (void *) kallsyms_lookup_dataptr("kvm_x86_ops"); | |
31 | ||
32 | if (kvm_x86_ops_sym) { | |
33 | kvm_x86_ops_sym->get_exit_info(vcpu, reason, info1, info2, | |
34 | exit_int_info, exit_int_info_err_code); | |
35 | } else { | |
36 | printk_once(KERN_WARNING "LTTng: kvm_x86_ops symbol lookup failed.\n"); | |
37 | } | |
38 | } | |
39 | ||
40 | static inline | |
41 | u64 lttng_kvm_x86_get_segment_base(struct kvm_vcpu *vcpu, int seg) | |
42 | { | |
43 | if (!kvm_x86_ops_sym) | |
44 | kvm_x86_ops_sym = | |
45 | (void *) kallsyms_lookup_dataptr("kvm_x86_ops"); | |
46 | ||
47 | if (kvm_x86_ops_sym) { | |
48 | return kvm_x86_ops_sym->get_segment_base(vcpu, seg); | |
49 | } else { | |
50 | printk_once(KERN_WARNING "LTTng: kvm_x86_ops symbol lookup failed.\n"); | |
51 | return 0; | |
52 | } | |
53 | } | |
54 | ||
55 | /* | |
56 | * Canary function to check for 'kvm_x86_ops' at compile time. | |
57 | * | |
58 | * From 'arch/x86/include/asm/kvm_host.h': | |
59 | * | |
60 | * extern struct kvm_x86_ops kvm_x86_ops;; | |
61 | */ | |
62 | static inline | |
63 | unsigned int __canary__kvm_x86_ops(void) | |
64 | { | |
65 | return kvm_x86_ops.vm_size; | |
66 | } | |
67 | ||
68 | #endif /* CONFIG_KALLSYMS_ALL */ | |
69 | ||
70 | #endif | |
71 | ||
72 | #endif /* _LTTNG_WRAPPER_KVM_X86_H */ |