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 <linux/nmi.h> |
26 | #include <asm/ptrace.h> |
27 | #include <asm/hyperv-tlfs.h> |
28 | |
29 | #define VTPM_BASE_ADDRESS 0xfed40000 |
30 | |
31 | struct ms_hyperv_info { |
32 | u32 features; |
33 | u32 priv_high; |
34 | u32 misc_features; |
35 | u32 hints; |
36 | u32 nested_features; |
37 | u32 max_vp_index; |
38 | u32 max_lp_index; |
39 | u8 vtl; |
40 | union { |
41 | u32 isolation_config_a; |
42 | struct { |
43 | u32 paravisor_present : 1; |
44 | u32 reserved_a1 : 31; |
45 | }; |
46 | }; |
47 | union { |
48 | u32 isolation_config_b; |
49 | struct { |
50 | u32 cvm_type : 4; |
51 | u32 reserved_b1 : 1; |
52 | u32 shared_gpa_boundary_active : 1; |
53 | u32 shared_gpa_boundary_bits : 6; |
54 | u32 reserved_b2 : 20; |
55 | }; |
56 | }; |
57 | u64 shared_gpa_boundary; |
58 | }; |
59 | extern struct ms_hyperv_info ms_hyperv; |
60 | extern bool hv_nested; |
61 | |
62 | extern void * __percpu *hyperv_pcpu_input_arg; |
63 | extern void * __percpu *hyperv_pcpu_output_arg; |
64 | |
65 | extern u64 hv_do_hypercall(u64 control, void *inputaddr, void *outputaddr); |
66 | extern u64 hv_do_fast_hypercall8(u16 control, u64 input8); |
67 | bool hv_isolation_type_snp(void); |
68 | bool hv_isolation_type_tdx(void); |
69 | |
70 | /* Helper functions that provide a consistent pattern for checking Hyper-V hypercall status. */ |
71 | static inline int hv_result(u64 status) |
72 | { |
73 | return status & HV_HYPERCALL_RESULT_MASK; |
74 | } |
75 | |
76 | static inline bool hv_result_success(u64 status) |
77 | { |
78 | return hv_result(status) == HV_STATUS_SUCCESS; |
79 | } |
80 | |
81 | static inline unsigned int hv_repcomp(u64 status) |
82 | { |
83 | /* Bits [43:32] of status have 'Reps completed' data. */ |
84 | return (status & HV_HYPERCALL_REP_COMP_MASK) >> |
85 | HV_HYPERCALL_REP_COMP_OFFSET; |
86 | } |
87 | |
88 | /* |
89 | * Rep hypercalls. Callers of this functions are supposed to ensure that |
90 | * rep_count and varhead_size comply with Hyper-V hypercall definition. |
91 | */ |
92 | static inline u64 hv_do_rep_hypercall(u16 code, u16 rep_count, u16 varhead_size, |
93 | void *input, void *output) |
94 | { |
95 | u64 control = code; |
96 | u64 status; |
97 | u16 rep_comp; |
98 | |
99 | control |= (u64)varhead_size << HV_HYPERCALL_VARHEAD_OFFSET; |
100 | control |= (u64)rep_count << HV_HYPERCALL_REP_COMP_OFFSET; |
101 | |
102 | do { |
103 | status = hv_do_hypercall(control, inputaddr: input, outputaddr: output); |
104 | if (!hv_result_success(status)) |
105 | return status; |
106 | |
107 | rep_comp = hv_repcomp(status); |
108 | |
109 | control &= ~HV_HYPERCALL_REP_START_MASK; |
110 | control |= (u64)rep_comp << HV_HYPERCALL_REP_START_OFFSET; |
111 | |
112 | touch_nmi_watchdog(); |
113 | } while (rep_comp < rep_count); |
114 | |
115 | return status; |
116 | } |
117 | |
118 | /* Generate the guest OS identifier as described in the Hyper-V TLFS */ |
119 | static inline u64 hv_generate_guest_id(u64 kernel_version) |
120 | { |
121 | u64 guest_id; |
122 | |
123 | guest_id = (((u64)HV_LINUX_VENDOR_ID) << 48); |
124 | guest_id |= (kernel_version << 16); |
125 | |
126 | return guest_id; |
127 | } |
128 | |
129 | /* Free the message slot and signal end-of-message if required */ |
130 | static inline void vmbus_signal_eom(struct hv_message *msg, u32 old_msg_type) |
131 | { |
132 | /* |
133 | * On crash we're reading some other CPU's message page and we need |
134 | * to be careful: this other CPU may already had cleared the header |
135 | * and the host may already had delivered some other message there. |
136 | * In case we blindly write msg->header.message_type we're going |
137 | * to lose it. We can still lose a message of the same type but |
138 | * we count on the fact that there can only be one |
139 | * CHANNELMSG_UNLOAD_RESPONSE and we don't care about other messages |
140 | * on crash. |
141 | */ |
142 | if (cmpxchg(&msg->header.message_type, old_msg_type, |
143 | HVMSG_NONE) != old_msg_type) |
144 | return; |
145 | |
146 | /* |
147 | * The cmxchg() above does an implicit memory barrier to |
148 | * ensure the write to MessageType (ie set to |
149 | * HVMSG_NONE) happens before we read the |
150 | * MessagePending and EOMing. Otherwise, the EOMing |
151 | * will not deliver any more messages since there is |
152 | * no empty slot |
153 | */ |
154 | if (msg->header.message_flags.msg_pending) { |
155 | /* |
156 | * This will cause message queue rescan to |
157 | * possibly deliver another msg from the |
158 | * hypervisor |
159 | */ |
160 | hv_set_register(HV_REGISTER_EOM, value: 0); |
161 | } |
162 | } |
163 | |
164 | void hv_setup_vmbus_handler(void (*handler)(void)); |
165 | void hv_remove_vmbus_handler(void); |
166 | void hv_setup_stimer0_handler(void (*handler)(void)); |
167 | void hv_remove_stimer0_handler(void); |
168 | |
169 | void hv_setup_kexec_handler(void (*handler)(void)); |
170 | void hv_remove_kexec_handler(void); |
171 | void hv_setup_crash_handler(void (*handler)(struct pt_regs *regs)); |
172 | void hv_remove_crash_handler(void); |
173 | |
174 | extern int vmbus_interrupt; |
175 | extern int vmbus_irq; |
176 | |
177 | extern bool hv_root_partition; |
178 | |
179 | #if IS_ENABLED(CONFIG_HYPERV) |
180 | /* |
181 | * Hypervisor's notion of virtual processor ID is different from |
182 | * Linux' notion of CPU ID. This information can only be retrieved |
183 | * in the context of the calling CPU. Setup a map for easy access |
184 | * to this information. |
185 | */ |
186 | extern u32 *hv_vp_index; |
187 | extern u32 hv_max_vp_index; |
188 | |
189 | extern u64 (*hv_read_reference_counter)(void); |
190 | |
191 | /* Sentinel value for an uninitialized entry in hv_vp_index array */ |
192 | #define VP_INVAL U32_MAX |
193 | |
194 | int __init hv_common_init(void); |
195 | void __init hv_common_free(void); |
196 | int hv_common_cpu_init(unsigned int cpu); |
197 | int hv_common_cpu_die(unsigned int cpu); |
198 | |
199 | void *hv_alloc_hyperv_page(void); |
200 | void *hv_alloc_hyperv_zeroed_page(void); |
201 | void hv_free_hyperv_page(void *addr); |
202 | |
203 | /** |
204 | * hv_cpu_number_to_vp_number() - Map CPU to VP. |
205 | * @cpu_number: CPU number in Linux terms |
206 | * |
207 | * This function returns the mapping between the Linux processor |
208 | * number and the hypervisor's virtual processor number, useful |
209 | * in making hypercalls and such that talk about specific |
210 | * processors. |
211 | * |
212 | * Return: Virtual processor number in Hyper-V terms |
213 | */ |
214 | static inline int hv_cpu_number_to_vp_number(int cpu_number) |
215 | { |
216 | return hv_vp_index[cpu_number]; |
217 | } |
218 | |
219 | static inline int __cpumask_to_vpset(struct hv_vpset *vpset, |
220 | const struct cpumask *cpus, |
221 | bool (*func)(int cpu)) |
222 | { |
223 | int cpu, vcpu, vcpu_bank, vcpu_offset, nr_bank = 1; |
224 | int max_vcpu_bank = hv_max_vp_index / HV_VCPUS_PER_SPARSE_BANK; |
225 | |
226 | /* vpset.valid_bank_mask can represent up to HV_MAX_SPARSE_VCPU_BANKS banks */ |
227 | if (max_vcpu_bank >= HV_MAX_SPARSE_VCPU_BANKS) |
228 | return 0; |
229 | |
230 | /* |
231 | * Clear all banks up to the maximum possible bank as hv_tlb_flush_ex |
232 | * structs are not cleared between calls, we risk flushing unneeded |
233 | * vCPUs otherwise. |
234 | */ |
235 | for (vcpu_bank = 0; vcpu_bank <= max_vcpu_bank; vcpu_bank++) |
236 | vpset->bank_contents[vcpu_bank] = 0; |
237 | |
238 | /* |
239 | * Some banks may end up being empty but this is acceptable. |
240 | */ |
241 | for_each_cpu(cpu, cpus) { |
242 | if (func && func(cpu)) |
243 | continue; |
244 | vcpu = hv_cpu_number_to_vp_number(cpu_number: cpu); |
245 | if (vcpu == VP_INVAL) |
246 | return -1; |
247 | vcpu_bank = vcpu / HV_VCPUS_PER_SPARSE_BANK; |
248 | vcpu_offset = vcpu % HV_VCPUS_PER_SPARSE_BANK; |
249 | __set_bit(vcpu_offset, (unsigned long *) |
250 | &vpset->bank_contents[vcpu_bank]); |
251 | if (vcpu_bank >= nr_bank) |
252 | nr_bank = vcpu_bank + 1; |
253 | } |
254 | vpset->valid_bank_mask = GENMASK_ULL(nr_bank - 1, 0); |
255 | return nr_bank; |
256 | } |
257 | |
258 | /* |
259 | * Convert a Linux cpumask into a Hyper-V VPset. In the _skip variant, |
260 | * 'func' is called for each CPU present in cpumask. If 'func' returns |
261 | * true, that CPU is skipped -- i.e., that CPU from cpumask is *not* |
262 | * added to the Hyper-V VPset. If 'func' is NULL, no CPUs are |
263 | * skipped. |
264 | */ |
265 | static inline int cpumask_to_vpset(struct hv_vpset *vpset, |
266 | const struct cpumask *cpus) |
267 | { |
268 | return __cpumask_to_vpset(vpset, cpus, NULL); |
269 | } |
270 | |
271 | static inline int cpumask_to_vpset_skip(struct hv_vpset *vpset, |
272 | const struct cpumask *cpus, |
273 | bool (*func)(int cpu)) |
274 | { |
275 | return __cpumask_to_vpset(vpset, cpus, func); |
276 | } |
277 | |
278 | void hyperv_report_panic(struct pt_regs *regs, long err, bool in_die); |
279 | bool hv_is_hyperv_initialized(void); |
280 | bool hv_is_hibernation_supported(void); |
281 | enum hv_isolation_type hv_get_isolation_type(void); |
282 | bool hv_is_isolation_supported(void); |
283 | bool hv_isolation_type_snp(void); |
284 | u64 hv_ghcb_hypercall(u64 control, void *input, void *output, u32 input_size); |
285 | u64 hv_tdx_hypercall(u64 control, u64 param1, u64 param2); |
286 | void hyperv_cleanup(void); |
287 | bool hv_query_ext_cap(u64 cap_query); |
288 | void hv_setup_dma_ops(struct device *dev, bool coherent); |
289 | #else /* CONFIG_HYPERV */ |
290 | static inline bool hv_is_hyperv_initialized(void) { return false; } |
291 | static inline bool hv_is_hibernation_supported(void) { return false; } |
292 | static inline void hyperv_cleanup(void) {} |
293 | static inline bool hv_is_isolation_supported(void) { return false; } |
294 | static inline enum hv_isolation_type hv_get_isolation_type(void) |
295 | { |
296 | return HV_ISOLATION_TYPE_NONE; |
297 | } |
298 | #endif /* CONFIG_HYPERV */ |
299 | |
300 | #endif |
301 | |