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2024-02-20 ea08eeccae9297f7aabd2ef7f0c2517ac4549acc 
 kernel/arch/x86/include/asm/mshyperv.h
....@@ -3,78 +3,16 @@
33 #define _ASM_X86_MSHYPER_H
44 
55 #include <linux/types.h>
6
-#include <linux/atomic.h>
76 #include <linux/nmi.h>
7
+#include <linux/msi.h>
88 #include <asm/io.h>
99 #include <asm/hyperv-tlfs.h>
1010 #include <asm/nospec-branch.h>
11
+#include <asm/paravirt.h>
1112 
12
-#define VP_INVAL	U32_MAX
13
-
14
-struct ms_hyperv_info {
15
-	u32 features;
16
-	u32 misc_features;
17
-	u32 hints;
18
-	u32 nested_features;
19
-	u32 max_vp_index;
20
-	u32 max_lp_index;
21
-};
22
-
23
-extern struct ms_hyperv_info ms_hyperv;
24
-
25
-/*
26
- * Generate the guest ID.
27
- */
28
-
29
-static inline  __u64 generate_guest_id(__u64 d_info1, __u64 kernel_version,
30
-				       __u64 d_info2)
31
-{
32
-	__u64 guest_id = 0;
33
-
34
-	guest_id = (((__u64)HV_LINUX_VENDOR_ID) << 48);
35
-	guest_id |= (d_info1 << 48);
36
-	guest_id |= (kernel_version << 16);
37
-	guest_id |= d_info2;
38
-
39
-	return guest_id;
40
-}
41
-
42
-
43
-/* Free the message slot and signal end-of-message if required */
44
-static inline void vmbus_signal_eom(struct hv_message *msg, u32 old_msg_type)
45
-{
46
-	/*
47
-	 * On crash we're reading some other CPU's message page and we need
48
-	 * to be careful: this other CPU may already had cleared the header
49
-	 * and the host may already had delivered some other message there.
50
-	 * In case we blindly write msg->header.message_type we're going
51
-	 * to lose it. We can still lose a message of the same type but
52
-	 * we count on the fact that there can only be one
53
-	 * CHANNELMSG_UNLOAD_RESPONSE and we don't care about other messages
54
-	 * on crash.
55
-	 */
56
-	if (cmpxchg(&msg->header.message_type, old_msg_type,
57
-		    HVMSG_NONE) != old_msg_type)
58
-		return;
59
-
60
-	/*
61
-	 * Make sure the write to MessageType (ie set to
62
-	 * HVMSG_NONE) happens before we read the
63
-	 * MessagePending and EOMing. Otherwise, the EOMing
64
-	 * will not deliver any more messages since there is
65
-	 * no empty slot
66
-	 */
67
-	mb();
68
-
69
-	if (msg->header.message_flags.msg_pending) {
70
-		/*
71
-		 * This will cause message queue rescan to
72
-		 * possibly deliver another msg from the
73
-		 * hypervisor
74
-		 */
75
-		wrmsrl(HV_X64_MSR_EOM, 0);
76
-	}
77
-}
13
+typedef int (*hyperv_fill_flush_list_func)(
14
+		struct hv_guest_mapping_flush_list *flush,
15
+		void *data);
7816 
7917 #define hv_init_timer(timer, tick) \
8018 	wrmsrl(HV_X64_MSR_STIMER0_COUNT + (2*timer), tick)
....@@ -92,43 +30,52 @@
9230 
9331 #define hv_get_vp_index(index) rdmsrl(HV_X64_MSR_VP_INDEX, index)
9432 
33
+#define hv_signal_eom() wrmsrl(HV_X64_MSR_EOM, 0)
34
+
9535 #define hv_get_synint_state(int_num, val) \
9636 	rdmsrl(HV_X64_MSR_SINT0 + int_num, val)
9737 #define hv_set_synint_state(int_num, val) \
9838 	wrmsrl(HV_X64_MSR_SINT0 + int_num, val)
39
+#define hv_recommend_using_aeoi() \
40
+	(!(ms_hyperv.hints & HV_DEPRECATING_AEOI_RECOMMENDED))
9941 
10042 #define hv_get_crash_ctl(val) \
10143 	rdmsrl(HV_X64_MSR_CRASH_CTL, val)
10244 
103
-void hyperv_callback_vector(void);
104
-void hyperv_reenlightenment_vector(void);
105
-#ifdef CONFIG_TRACING
106
-#define trace_hyperv_callback_vector hyperv_callback_vector
107
-#endif
108
-void hyperv_vector_handler(struct pt_regs *regs);
109
-void hv_setup_vmbus_irq(void (*handler)(void));
110
-void hv_remove_vmbus_irq(void);
45
+#define hv_get_time_ref_count(val) \
46
+	rdmsrl(HV_X64_MSR_TIME_REF_COUNT, val)
11147 
112
-void hv_setup_kexec_handler(void (*handler)(void));
113
-void hv_remove_kexec_handler(void);
114
-void hv_setup_crash_handler(void (*handler)(struct pt_regs *regs));
115
-void hv_remove_crash_handler(void);
48
+#define hv_get_reference_tsc(val) \
49
+	rdmsrl(HV_X64_MSR_REFERENCE_TSC, val)
50
+#define hv_set_reference_tsc(val) \
51
+	wrmsrl(HV_X64_MSR_REFERENCE_TSC, val)
52
+#define hv_set_clocksource_vdso(val) \
53
+	((val).vdso_clock_mode = VDSO_CLOCKMODE_HVCLOCK)
54
+#define hv_enable_vdso_clocksource() \
55
+	vclocks_set_used(VDSO_CLOCKMODE_HVCLOCK);
56
+#define hv_get_raw_timer() rdtsc_ordered()
57
+#define hv_get_vector() HYPERVISOR_CALLBACK_VECTOR
11658 
11759 /*
118
- * Routines for stimer0 Direct Mode handling.
119
- * On x86/x64, there are no percpu actions to take.
60
+ * Reference to pv_ops must be inline so objtool
61
+ * detection of noinstr violations can work correctly.
12062  */
121
-void hv_stimer0_vector_handler(struct pt_regs *regs);
122
-void hv_stimer0_callback_vector(void);
123
-int hv_setup_stimer0_irq(int *irq, int *vector, void (*handler)(void));
124
-void hv_remove_stimer0_irq(int irq);
63
+static __always_inline void hv_setup_sched_clock(void *sched_clock)
64
+{
65
+#ifdef CONFIG_PARAVIRT
66
+	pv_ops.time.sched_clock = sched_clock;
67
+#endif
68
+}
69
+
70
+void hyperv_vector_handler(struct pt_regs *regs);
12571 
12672 static inline void hv_enable_stimer0_percpu_irq(int irq) {}
12773 static inline void hv_disable_stimer0_percpu_irq(int irq) {}
12874 
12975 
13076 #if IS_ENABLED(CONFIG_HYPERV)
131
-extern struct clocksource *hyperv_cs;
77
+extern int hyperv_init_cpuhp;
78
+
13279 extern void *hv_hypercall_pg;
13380 extern void  __percpu  **hyperv_pcpu_input_arg;
13481 
....@@ -232,7 +179,7 @@
232179 				      : "cc");
233180 	}
234181 #endif
235
-		return hv_status;
182
+	return hv_status;
236183 }
237184 
238185 /*
....@@ -267,14 +214,6 @@
267214 	return status;
268215 }
269216 
270
-/*
271
- * Hypervisor's notion of virtual processor ID is different from
272
- * Linux' notion of CPU ID. This information can only be retrieved
273
- * in the context of the calling CPU. Setup a map for easy access
274
- * to this information.
275
- */
276
-extern u32 *hv_vp_index;
277
-extern u32 hv_max_vp_index;
278217 extern struct hv_vp_assist_page **hv_vp_assist_page;
279218 
280219 static inline struct hv_vp_assist_page *hv_get_vp_assist_page(unsigned int cpu)
....@@ -285,81 +224,34 @@
285224 	return hv_vp_assist_page[cpu];
286225 }
287226 
288
-/**
289
- * hv_cpu_number_to_vp_number() - Map CPU to VP.
290
- * @cpu_number: CPU number in Linux terms
291
- *
292
- * This function returns the mapping between the Linux processor
293
- * number and the hypervisor's virtual processor number, useful
294
- * in making hypercalls and such that talk about specific
295
- * processors.
296
- *
297
- * Return: Virtual processor number in Hyper-V terms
298
- */
299
-static inline int hv_cpu_number_to_vp_number(int cpu_number)
300
-{
301
-	return hv_vp_index[cpu_number];
302
-}
303
-
304
-static inline int cpumask_to_vpset(struct hv_vpset *vpset,
305
-				    const struct cpumask *cpus)
306
-{
307
-	int cpu, vcpu, vcpu_bank, vcpu_offset, nr_bank = 1;
308
-
309
-	/* valid_bank_mask can represent up to 64 banks */
310
-	if (hv_max_vp_index / 64 >= 64)
311
-		return 0;
312
-
313
-	/*
314
-	 * Clear all banks up to the maximum possible bank as hv_tlb_flush_ex
315
-	 * structs are not cleared between calls, we risk flushing unneeded
316
-	 * vCPUs otherwise.
317
-	 */
318
-	for (vcpu_bank = 0; vcpu_bank <= hv_max_vp_index / 64; vcpu_bank++)
319
-		vpset->bank_contents[vcpu_bank] = 0;
320
-
321
-	/*
322
-	 * Some banks may end up being empty but this is acceptable.
323
-	 */
324
-	for_each_cpu(cpu, cpus) {
325
-		vcpu = hv_cpu_number_to_vp_number(cpu);
326
-		if (vcpu == VP_INVAL)
327
-			return -1;
328
-		vcpu_bank = vcpu / 64;
329
-		vcpu_offset = vcpu % 64;
330
-		__set_bit(vcpu_offset, (unsigned long *)
331
-			  &vpset->bank_contents[vcpu_bank]);
332
-		if (vcpu_bank >= nr_bank)
333
-			nr_bank = vcpu_bank + 1;
334
-	}
335
-	vpset->valid_bank_mask = GENMASK_ULL(nr_bank - 1, 0);
336
-	return nr_bank;
337
-}
338
-
339227 void __init hyperv_init(void);
340228 void hyperv_setup_mmu_ops(void);
341
-void hyperv_report_panic(struct pt_regs *regs, long err, bool in_die);
342
-void hyperv_report_panic_msg(phys_addr_t pa, size_t size);
343
-bool hv_is_hyperv_initialized(void);
344
-void hyperv_cleanup(void);
345
-
346
-void hyperv_reenlightenment_intr(struct pt_regs *regs);
229
+void *hv_alloc_hyperv_page(void);
230
+void *hv_alloc_hyperv_zeroed_page(void);
231
+void hv_free_hyperv_page(unsigned long addr);
347232 void set_hv_tscchange_cb(void (*cb)(void));
348233 void clear_hv_tscchange_cb(void);
349234 void hyperv_stop_tsc_emulation(void);
350235 int hyperv_flush_guest_mapping(u64 as);
236
+int hyperv_flush_guest_mapping_range(u64 as,
237
+		hyperv_fill_flush_list_func fill_func, void *data);
238
+int hyperv_fill_flush_guest_mapping_list(
239
+		struct hv_guest_mapping_flush_list *flush,
240
+		u64 start_gfn, u64 end_gfn);
351241 
352242 #ifdef CONFIG_X86_64
353243 void hv_apic_init(void);
244
+void __init hv_init_spinlocks(void);
245
+bool hv_vcpu_is_preempted(int vcpu);
354246 #else
355247 static inline void hv_apic_init(void) {}
356248 #endif
357249 
358250 #else /* CONFIG_HYPERV */
359251 static inline void hyperv_init(void) {}
360
-static inline bool hv_is_hyperv_initialized(void) { return false; }
361
-static inline void hyperv_cleanup(void) {}
362252 static inline void hyperv_setup_mmu_ops(void) {}
253
+static inline void *hv_alloc_hyperv_page(void) { return NULL; }
254
+static inline void hv_free_hyperv_page(unsigned long addr) {}
363255 static inline void set_hv_tscchange_cb(void (*cb)(void)) {}
364256 static inline void clear_hv_tscchange_cb(void) {}
365257 static inline void hyperv_stop_tsc_emulation(void) {};
....@@ -368,75 +260,14 @@
368260 	return NULL;
369261 }
370262 static inline int hyperv_flush_guest_mapping(u64 as) { return -1; }
263
+static inline int hyperv_flush_guest_mapping_range(u64 as,
264
+		hyperv_fill_flush_list_func fill_func, void *data)
265
+{
266
+	return -1;
267
+}
371268 #endif /* CONFIG_HYPERV */
372269 
373
-#ifdef CONFIG_HYPERV_TSCPAGE
374
-struct ms_hyperv_tsc_page *hv_get_tsc_page(void);
375
-static inline u64 hv_read_tsc_page_tsc(const struct ms_hyperv_tsc_page *tsc_pg,
376
-				       u64 *cur_tsc)
377
-{
378
-	u64 scale, offset;
379
-	u32 sequence;
380270 
381
-	/*
382
-	 * The protocol for reading Hyper-V TSC page is specified in Hypervisor
383
-	 * Top-Level Functional Specification ver. 3.0 and above. To get the
384
-	 * reference time we must do the following:
385
-	 * - READ ReferenceTscSequence
386
-	 *   A special '0' value indicates the time source is unreliable and we
387
-	 *   need to use something else. The currently published specification
388
-	 *   versions (up to 4.0b) contain a mistake and wrongly claim '-1'
389
-	 *   instead of '0' as the special value, see commit c35b82ef0294.
390
-	 * - ReferenceTime =
391
-	 *        ((RDTSC() * ReferenceTscScale) >> 64) + ReferenceTscOffset
392
-	 * - READ ReferenceTscSequence again. In case its value has changed
393
-	 *   since our first reading we need to discard ReferenceTime and repeat
394
-	 *   the whole sequence as the hypervisor was updating the page in
395
-	 *   between.
396
-	 */
397
-	do {
398
-		sequence = READ_ONCE(tsc_pg->tsc_sequence);
399
-		if (!sequence)
400
-			return U64_MAX;
401
-		/*
402
-		 * Make sure we read sequence before we read other values from
403
-		 * TSC page.
404
-		 */
405
-		smp_rmb();
271
+#include <asm-generic/mshyperv.h>
406272 
407
-		scale = READ_ONCE(tsc_pg->tsc_scale);
408
-		offset = READ_ONCE(tsc_pg->tsc_offset);
409
-		*cur_tsc = rdtsc_ordered();
410
-
411
-		/*
412
-		 * Make sure we read sequence after we read all other values
413
-		 * from TSC page.
414
-		 */
415
-		smp_rmb();
416
-
417
-	} while (READ_ONCE(tsc_pg->tsc_sequence) != sequence);
418
-
419
-	return mul_u64_u64_shr(*cur_tsc, scale, 64) + offset;
420
-}
421
-
422
-static inline u64 hv_read_tsc_page(const struct ms_hyperv_tsc_page *tsc_pg)
423
-{
424
-	u64 cur_tsc;
425
-
426
-	return hv_read_tsc_page_tsc(tsc_pg, &cur_tsc);
427
-}
428
-
429
-#else
430
-static inline struct ms_hyperv_tsc_page *hv_get_tsc_page(void)
431
-{
432
-	return NULL;
433
-}
434
-
435
-static inline u64 hv_read_tsc_page_tsc(const struct ms_hyperv_tsc_page *tsc_pg,
436
-				       u64 *cur_tsc)
437
-{
438
-	BUG();
439
-	return U64_MAX;
440
-}
441
-#endif
442273 #endif