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1 | // SPDX-License-Identifier: GPL-2.0 |
2 | ||
3 | /* | |
4 | * Core routines for interacting with Microsoft's Hyper-V hypervisor, | |
5 | * including hypervisor initialization. | |
6 | * | |
7 | * Copyright (C) 2021, Microsoft, Inc. | |
8 | * | |
9 | * Author : Michael Kelley <mikelley@microsoft.com> | |
10 | */ | |
11 | ||
12 | #include <linux/types.h> | |
13 | #include <linux/acpi.h> | |
14 | #include <linux/export.h> | |
15 | #include <linux/errno.h> | |
16 | #include <linux/version.h> | |
17 | #include <linux/cpuhotplug.h> | |
18 | #include <asm/mshyperv.h> | |
19 | ||
20 | static bool hyperv_initialized; | |
21 | ||
22 | static int __init hyperv_init(void) | |
23 | { | |
24 | struct hv_get_vp_registers_output result; | |
25 | u32 a, b, c, d; | |
26 | u64 guest_id; | |
27 | int ret; | |
28 | ||
29 | /* | |
30 | * Allow for a kernel built with CONFIG_HYPERV to be running in | |
31 | * a non-Hyper-V environment, including on DT instead of ACPI. | |
32 | * In such cases, do nothing and return success. | |
33 | */ | |
34 | if (acpi_disabled) | |
35 | return 0; | |
36 | ||
37 | if (strncmp((char *)&acpi_gbl_FADT.hypervisor_id, "MsHyperV", 8)) | |
38 | return 0; | |
39 | ||
40 | /* Setup the guest ID */ | |
41 | guest_id = generate_guest_id(0, LINUX_VERSION_CODE, 0); | |
42 | hv_set_vpreg(HV_REGISTER_GUEST_OSID, guest_id); | |
43 | ||
44 | /* Get the features and hints from Hyper-V */ | |
45 | hv_get_vpreg_128(HV_REGISTER_FEATURES, &result); | |
46 | ms_hyperv.features = result.as32.a; | |
47 | ms_hyperv.priv_high = result.as32.b; | |
48 | ms_hyperv.misc_features = result.as32.c; | |
49 | ||
50 | hv_get_vpreg_128(HV_REGISTER_ENLIGHTENMENTS, &result); | |
51 | ms_hyperv.hints = result.as32.a; | |
52 | ||
53 | pr_info("Hyper-V: privilege flags low 0x%x, high 0x%x, hints 0x%x, misc 0x%x\n", | |
54 | ms_hyperv.features, ms_hyperv.priv_high, ms_hyperv.hints, | |
55 | ms_hyperv.misc_features); | |
56 | ||
57 | /* Get information about the Hyper-V host version */ | |
58 | hv_get_vpreg_128(HV_REGISTER_HYPERVISOR_VERSION, &result); | |
59 | a = result.as32.a; | |
60 | b = result.as32.b; | |
61 | c = result.as32.c; | |
62 | d = result.as32.d; | |
63 | pr_info("Hyper-V: Host Build %d.%d.%d.%d-%d-%d\n", | |
64 | b >> 16, b & 0xFFFF, a, d & 0xFFFFFF, c, d >> 24); | |
65 | ||
66 | ret = hv_common_init(); | |
67 | if (ret) | |
68 | return ret; | |
69 | ||
70 | ret = cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, "arm64/hyperv_init:online", | |
71 | hv_common_cpu_init, hv_common_cpu_die); | |
72 | if (ret < 0) { | |
73 | hv_common_free(); | |
74 | return ret; | |
75 | } | |
76 | ||
77 | hyperv_initialized = true; | |
78 | return 0; | |
79 | } | |
80 | ||
81 | early_initcall(hyperv_init); | |
82 | ||
83 | bool hv_is_hyperv_initialized(void) | |
84 | { | |
85 | return hyperv_initialized; | |
86 | } | |
87 | EXPORT_SYMBOL_GPL(hv_is_hyperv_initialized); |