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1 | /* SPDX-License-Identifier: GPL-2.0 */ |
2 | ||
3 | /* | |
4 | * Linux-specific definitions for managing interactions with Microsoft's | |
5 | * Hyper-V hypervisor. The definitions in this file are architecture | |
6 | * independent. See arch/<arch>/include/asm/mshyperv.h for definitions | |
7 | * that are specific to architecture <arch>. | |
8 | * | |
9 | * Definitions that are specified in the Hyper-V Top Level Functional | |
10 | * Spec (TLFS) should not go in this file, but should instead go in | |
11 | * hyperv-tlfs.h. | |
12 | * | |
13 | * Copyright (C) 2019, Microsoft, Inc. | |
14 | * | |
15 | * Author : Michael Kelley <mikelley@microsoft.com> | |
16 | */ | |
17 | ||
18 | #ifndef _ASM_GENERIC_MSHYPERV_H | |
19 | #define _ASM_GENERIC_MSHYPERV_H | |
20 | ||
21 | #include <linux/types.h> | |
22 | #include <linux/atomic.h> | |
23 | #include <linux/bitops.h> | |
24 | #include <linux/cpumask.h> | |
25 | #include <asm/ptrace.h> | |
26 | #include <asm/hyperv-tlfs.h> | |
27 | ||
28 | struct ms_hyperv_info { | |
29 | u32 features; | |
30 | u32 misc_features; | |
31 | u32 hints; | |
32 | u32 nested_features; | |
33 | u32 max_vp_index; | |
34 | u32 max_lp_index; | |
35 | }; | |
36 | extern struct ms_hyperv_info ms_hyperv; | |
37 | ||
38 | extern u64 hv_do_hypercall(u64 control, void *inputaddr, void *outputaddr); | |
39 | extern u64 hv_do_fast_hypercall8(u16 control, u64 input8); | |
40 | ||
41 | ||
42 | /* Generate the guest OS identifier as described in the Hyper-V TLFS */ | |
43 | static inline __u64 generate_guest_id(__u64 d_info1, __u64 kernel_version, | |
44 | __u64 d_info2) | |
45 | { | |
46 | __u64 guest_id = 0; | |
47 | ||
48 | guest_id = (((__u64)HV_LINUX_VENDOR_ID) << 48); | |
49 | guest_id |= (d_info1 << 48); | |
50 | guest_id |= (kernel_version << 16); | |
51 | guest_id |= d_info2; | |
52 | ||
53 | return guest_id; | |
54 | } | |
55 | ||
56 | ||
57 | /* Free the message slot and signal end-of-message if required */ | |
58 | static inline void vmbus_signal_eom(struct hv_message *msg, u32 old_msg_type) | |
59 | { | |
60 | /* | |
61 | * On crash we're reading some other CPU's message page and we need | |
62 | * to be careful: this other CPU may already had cleared the header | |
63 | * and the host may already had delivered some other message there. | |
64 | * In case we blindly write msg->header.message_type we're going | |
65 | * to lose it. We can still lose a message of the same type but | |
66 | * we count on the fact that there can only be one | |
67 | * CHANNELMSG_UNLOAD_RESPONSE and we don't care about other messages | |
68 | * on crash. | |
69 | */ | |
70 | if (cmpxchg(&msg->header.message_type, old_msg_type, | |
71 | HVMSG_NONE) != old_msg_type) | |
72 | return; | |
73 | ||
74 | /* | |
75 | * The cmxchg() above does an implicit memory barrier to | |
76 | * ensure the write to MessageType (ie set to | |
77 | * HVMSG_NONE) happens before we read the | |
78 | * MessagePending and EOMing. Otherwise, the EOMing | |
79 | * will not deliver any more messages since there is | |
80 | * no empty slot | |
81 | */ | |
82 | if (msg->header.message_flags.msg_pending) { | |
83 | /* | |
84 | * This will cause message queue rescan to | |
85 | * possibly deliver another msg from the | |
86 | * hypervisor | |
87 | */ | |
88 | hv_signal_eom(); | |
89 | } | |
90 | } | |
91 | ||
626b901f | 92 | int hv_setup_vmbus_irq(int irq, void (*handler)(void)); |
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93 | void hv_remove_vmbus_irq(void); |
94 | void hv_enable_vmbus_irq(void); | |
95 | void hv_disable_vmbus_irq(void); | |
96 | ||
97 | void hv_setup_kexec_handler(void (*handler)(void)); | |
98 | void hv_remove_kexec_handler(void); | |
99 | void hv_setup_crash_handler(void (*handler)(struct pt_regs *regs)); | |
100 | void hv_remove_crash_handler(void); | |
101 | ||
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102 | extern int vmbus_interrupt; |
103 | ||
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104 | #if IS_ENABLED(CONFIG_HYPERV) |
105 | /* | |
106 | * Hypervisor's notion of virtual processor ID is different from | |
107 | * Linux' notion of CPU ID. This information can only be retrieved | |
108 | * in the context of the calling CPU. Setup a map for easy access | |
109 | * to this information. | |
110 | */ | |
111 | extern u32 *hv_vp_index; | |
112 | extern u32 hv_max_vp_index; | |
113 | ||
114 | /* Sentinel value for an uninitialized entry in hv_vp_index array */ | |
115 | #define VP_INVAL U32_MAX | |
116 | ||
117 | /** | |
118 | * hv_cpu_number_to_vp_number() - Map CPU to VP. | |
119 | * @cpu_number: CPU number in Linux terms | |
120 | * | |
121 | * This function returns the mapping between the Linux processor | |
122 | * number and the hypervisor's virtual processor number, useful | |
123 | * in making hypercalls and such that talk about specific | |
124 | * processors. | |
125 | * | |
126 | * Return: Virtual processor number in Hyper-V terms | |
127 | */ | |
128 | static inline int hv_cpu_number_to_vp_number(int cpu_number) | |
129 | { | |
130 | return hv_vp_index[cpu_number]; | |
131 | } | |
132 | ||
133 | static inline int cpumask_to_vpset(struct hv_vpset *vpset, | |
134 | const struct cpumask *cpus) | |
135 | { | |
136 | int cpu, vcpu, vcpu_bank, vcpu_offset, nr_bank = 1; | |
137 | ||
138 | /* valid_bank_mask can represent up to 64 banks */ | |
139 | if (hv_max_vp_index / 64 >= 64) | |
140 | return 0; | |
141 | ||
142 | /* | |
143 | * Clear all banks up to the maximum possible bank as hv_tlb_flush_ex | |
144 | * structs are not cleared between calls, we risk flushing unneeded | |
145 | * vCPUs otherwise. | |
146 | */ | |
147 | for (vcpu_bank = 0; vcpu_bank <= hv_max_vp_index / 64; vcpu_bank++) | |
148 | vpset->bank_contents[vcpu_bank] = 0; | |
149 | ||
150 | /* | |
151 | * Some banks may end up being empty but this is acceptable. | |
152 | */ | |
153 | for_each_cpu(cpu, cpus) { | |
154 | vcpu = hv_cpu_number_to_vp_number(cpu); | |
155 | if (vcpu == VP_INVAL) | |
156 | return -1; | |
157 | vcpu_bank = vcpu / 64; | |
158 | vcpu_offset = vcpu % 64; | |
159 | __set_bit(vcpu_offset, (unsigned long *) | |
160 | &vpset->bank_contents[vcpu_bank]); | |
161 | if (vcpu_bank >= nr_bank) | |
162 | nr_bank = vcpu_bank + 1; | |
163 | } | |
164 | vpset->valid_bank_mask = GENMASK_ULL(nr_bank - 1, 0); | |
165 | return nr_bank; | |
166 | } | |
167 | ||
f3a99e76 | 168 | void hyperv_report_panic(struct pt_regs *regs, long err, bool in_die); |
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169 | void hyperv_report_panic_msg(phys_addr_t pa, size_t size); |
170 | bool hv_is_hyperv_initialized(void); | |
b96f8653 | 171 | bool hv_is_hibernation_supported(void); |
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172 | void hyperv_cleanup(void); |
173 | #else /* CONFIG_HYPERV */ | |
174 | static inline bool hv_is_hyperv_initialized(void) { return false; } | |
b96f8653 | 175 | static inline bool hv_is_hibernation_supported(void) { return false; } |
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176 | static inline void hyperv_cleanup(void) {} |
177 | #endif /* CONFIG_HYPERV */ | |
178 | ||
179 | #if IS_ENABLED(CONFIG_HYPERV) | |
180 | extern int hv_setup_stimer0_irq(int *irq, int *vector, void (*handler)(void)); | |
181 | extern void hv_remove_stimer0_irq(int irq); | |
182 | #endif | |
183 | ||
184 | #endif |