3 * Copyright (c) 2011, Microsoft Corporation.
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms and conditions of the GNU General Public License,
7 * version 2, as published by the Free Software Foundation.
9 * This program is distributed in the hope it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
14 * You should have received a copy of the GNU General Public License along with
15 * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
16 * Place - Suite 330, Boston, MA 02111-1307 USA.
19 * Haiyang Zhang <haiyangz@microsoft.com>
20 * Hank Janssen <hjanssen@microsoft.com>
21 * K. Y. Srinivasan <kys@microsoft.com>
25 #ifndef _HYPERV_VMBUS_H
26 #define _HYPERV_VMBUS_H
28 #include <linux/list.h>
29 #include <asm/sync_bitops.h>
30 #include <linux/atomic.h>
31 #include <linux/hyperv.h>
34 * Timeout for services such as KVP and fcopy.
36 #define HV_UTIL_TIMEOUT 30
39 * Timeout for guest-host handshake for services.
41 #define HV_UTIL_NEGO_TIMEOUT 55
44 * The below CPUID leaves are present if VersionAndFeatures.HypervisorPresent
45 * is set by CPUID(HVCPUID_VERSION_FEATURES).
47 enum hv_cpuid_function {
48 HVCPUID_VERSION_FEATURES = 0x00000001,
49 HVCPUID_VENDOR_MAXFUNCTION = 0x40000000,
50 HVCPUID_INTERFACE = 0x40000001,
53 * The remaining functions depend on the value of
56 HVCPUID_VERSION = 0x40000002,
57 HVCPUID_FEATURES = 0x40000003,
58 HVCPUID_ENLIGHTENMENT_INFO = 0x40000004,
59 HVCPUID_IMPLEMENTATION_LIMITS = 0x40000005,
62 #define HV_FEATURE_GUEST_CRASH_MSR_AVAILABLE 0x400
64 #define HV_X64_MSR_CRASH_P0 0x40000100
65 #define HV_X64_MSR_CRASH_P1 0x40000101
66 #define HV_X64_MSR_CRASH_P2 0x40000102
67 #define HV_X64_MSR_CRASH_P3 0x40000103
68 #define HV_X64_MSR_CRASH_P4 0x40000104
69 #define HV_X64_MSR_CRASH_CTL 0x40000105
71 #define HV_CRASH_CTL_CRASH_NOTIFY (1ULL << 63)
73 /* Define version of the synthetic interrupt controller. */
74 #define HV_SYNIC_VERSION (1)
76 #define HV_ANY_VP (0xFFFFFFFF)
78 /* Define synthetic interrupt controller flag constants. */
79 #define HV_EVENT_FLAGS_COUNT (256 * 8)
80 #define HV_EVENT_FLAGS_BYTE_COUNT (256)
81 #define HV_EVENT_FLAGS_DWORD_COUNT (256 / sizeof(u32))
83 /* Define invalid partition identifier. */
84 #define HV_PARTITION_ID_INVALID ((u64)0x0)
86 /* Define port type. */
93 /* Define port information structure. */
95 enum hv_port_type port_type;
106 u16 base_flag_number;
117 struct hv_connection_info {
118 enum hv_port_type port_type;
123 } message_connection_info;
126 } event_connection_info;
129 } monitor_connection_info;
134 * Timer configuration register.
136 union hv_timer_config {
149 /* Define the number of message buffers associated with each port. */
150 #define HV_PORT_MESSAGE_BUFFER_COUNT (16)
152 /* Define the synthetic interrupt controller event flags format. */
153 union hv_synic_event_flags {
154 u8 flags8[HV_EVENT_FLAGS_BYTE_COUNT];
155 u32 flags32[HV_EVENT_FLAGS_DWORD_COUNT];
158 /* Define the synthetic interrupt flags page layout. */
159 struct hv_synic_event_flags_page {
160 union hv_synic_event_flags sintevent_flags[HV_SYNIC_SINT_COUNT];
163 /* Define SynIC control register. */
164 union hv_synic_scontrol {
172 /* Define synthetic interrupt source. */
173 union hv_synic_sint {
184 /* Define the format of the SIMP register */
185 union hv_synic_simp {
190 u64 base_simp_gpa:52;
194 /* Define the format of the SIEFP register */
195 union hv_synic_siefp {
200 u64 base_siefp_gpa:52;
204 /* Definitions for the monitored notification facility */
205 union hv_monitor_trigger_group {
213 struct hv_monitor_parameter {
214 union hv_connection_id connectionid;
219 union hv_monitor_trigger_state {
228 /* struct hv_monitor_page Layout */
229 /* ------------------------------------------------------ */
230 /* | 0 | TriggerState (4 bytes) | Rsvd1 (4 bytes) | */
231 /* | 8 | TriggerGroup[0] | */
232 /* | 10 | TriggerGroup[1] | */
233 /* | 18 | TriggerGroup[2] | */
234 /* | 20 | TriggerGroup[3] | */
235 /* | 28 | Rsvd2[0] | */
236 /* | 30 | Rsvd2[1] | */
237 /* | 38 | Rsvd2[2] | */
238 /* | 40 | NextCheckTime[0][0] | NextCheckTime[0][1] | */
240 /* | 240 | Latency[0][0..3] | */
241 /* | 340 | Rsvz3[0] | */
242 /* | 440 | Parameter[0][0] | */
243 /* | 448 | Parameter[0][1] | */
245 /* | 840 | Rsvd4[0] | */
246 /* ------------------------------------------------------ */
247 struct hv_monitor_page {
248 union hv_monitor_trigger_state trigger_state;
251 union hv_monitor_trigger_group trigger_group[4];
254 s32 next_checktime[4][32];
259 struct hv_monitor_parameter parameter[4][32];
264 /* Definition of the hv_post_message hypercall input structure. */
265 struct hv_input_post_message {
266 union hv_connection_id connectionid;
270 u64 payload[HV_MESSAGE_PAYLOAD_QWORD_COUNT];
274 * Versioning definitions used for guests reporting themselves to the
275 * hypervisor, and visa versa.
278 /* Version info reported by guest OS's */
279 enum hv_guest_os_vendor {
280 HVGUESTOS_VENDOR_MICROSOFT = 0x0001
283 enum hv_guest_os_microsoft_ids {
284 HVGUESTOS_MICROSOFT_UNDEFINED = 0x00,
285 HVGUESTOS_MICROSOFT_MSDOS = 0x01,
286 HVGUESTOS_MICROSOFT_WINDOWS3X = 0x02,
287 HVGUESTOS_MICROSOFT_WINDOWS9X = 0x03,
288 HVGUESTOS_MICROSOFT_WINDOWSNT = 0x04,
289 HVGUESTOS_MICROSOFT_WINDOWSCE = 0x05
293 * Declare the MSR used to identify the guest OS.
295 #define HV_X64_MSR_GUEST_OS_ID 0x40000000
297 union hv_x64_msr_guest_os_id_contents {
301 u64 service_version:8; /* Service Pack, etc. */
304 u64 os_id:8; /* enum hv_guest_os_microsoft_ids (if Vendor=MS) */
305 u64 vendor_id:16; /* enum hv_guest_os_vendor */
310 VMBUS_MESSAGE_CONNECTION_ID = 1,
311 VMBUS_MESSAGE_PORT_ID = 1,
312 VMBUS_EVENT_CONNECTION_ID = 2,
313 VMBUS_EVENT_PORT_ID = 2,
314 VMBUS_MONITOR_CONNECTION_ID = 3,
315 VMBUS_MONITOR_PORT_ID = 3,
316 VMBUS_MESSAGE_SINT = 2,
321 #define HV_PRESENT_BIT 0x80000000
324 #define HV_CPU_POWER_MANAGEMENT (1 << 0)
325 #define HV_RECOMMENDATIONS_MAX 4
328 #define HV_CAPS_MAX 8
331 #define HV_HYPERCALL_PARAM_ALIGN sizeof(u64)
334 /* Service definitions */
336 #define HV_SERVICE_PARENT_PORT (0)
337 #define HV_SERVICE_PARENT_CONNECTION (0)
339 #define HV_SERVICE_CONNECT_RESPONSE_SUCCESS (0)
340 #define HV_SERVICE_CONNECT_RESPONSE_INVALID_PARAMETER (1)
341 #define HV_SERVICE_CONNECT_RESPONSE_UNKNOWN_SERVICE (2)
342 #define HV_SERVICE_CONNECT_RESPONSE_CONNECTION_REJECTED (3)
344 #define HV_SERVICE_CONNECT_REQUEST_MESSAGE_ID (1)
345 #define HV_SERVICE_CONNECT_RESPONSE_MESSAGE_ID (2)
346 #define HV_SERVICE_DISCONNECT_REQUEST_MESSAGE_ID (3)
347 #define HV_SERVICE_DISCONNECT_RESPONSE_MESSAGE_ID (4)
348 #define HV_SERVICE_MAX_MESSAGE_ID (4)
350 #define HV_SERVICE_PROTOCOL_VERSION (0x0010)
351 #define HV_CONNECT_PAYLOAD_BYTE_COUNT 64
353 /* #define VMBUS_REVISION_NUMBER 6 */
355 /* Our local vmbus's port and connection id. Anything >0 is fine */
356 /* #define VMBUS_PORT_ID 11 */
358 /* 628180B8-308D-4c5e-B7DB-1BEB62E62EF4 */
359 static const uuid_le VMBUS_SERVICE_ID = {
361 0xb8, 0x80, 0x81, 0x62, 0x8d, 0x30, 0x5e, 0x4c,
362 0xb7, 0xdb, 0x1b, 0xeb, 0x62, 0xe6, 0x2e, 0xf4
369 /* We only support running on top of Hyper-V
370 * So at this point this really can only contain the Hyper-V ID
376 bool synic_initialized;
378 void *synic_message_page[NR_CPUS];
379 void *synic_event_page[NR_CPUS];
381 * Hypervisor's notion of virtual processor ID is different from
382 * Linux' notion of CPU ID. This information can only be retrieved
383 * in the context of the calling CPU. Setup a map for easy access
384 * to this information:
386 * vp_index[a] is the Hyper-V's processor ID corresponding to
389 u32 vp_index[NR_CPUS];
391 * Starting with win8, we can take channel interrupts on any CPU;
392 * we will manage the tasklet that handles events messages on a per CPU
395 struct tasklet_struct *event_dpc[NR_CPUS];
396 struct tasklet_struct *msg_dpc[NR_CPUS];
398 * To optimize the mapping of relid to channel, maintain
399 * per-cpu list of the channels based on their CPU affinity.
401 struct list_head percpu_list[NR_CPUS];
403 * buffer to post messages to the host.
405 void *post_msg_page[NR_CPUS];
407 * Support PV clockevent device.
409 struct clock_event_device *clk_evt[NR_CPUS];
411 * To manage allocations in a NUMA node.
412 * Array indexed by numa node ID.
414 struct cpumask *hv_numa_map;
417 extern struct hv_context hv_context;
419 struct hv_ring_buffer_debug_info {
420 u32 current_interrupt_mask;
421 u32 current_read_index;
422 u32 current_write_index;
423 u32 bytes_avail_toread;
424 u32 bytes_avail_towrite;
429 extern int hv_init(void);
431 extern void hv_cleanup(bool crash);
433 extern int hv_post_message(union hv_connection_id connection_id,
434 enum hv_message_type message_type,
435 void *payload, size_t payload_size);
437 extern int hv_synic_alloc(void);
439 extern void hv_synic_free(void);
441 extern int hv_synic_init(unsigned int cpu);
443 extern int hv_synic_cleanup(unsigned int cpu);
445 extern void hv_synic_clockevents_cleanup(void);
448 * Host version information.
450 extern unsigned int host_info_eax;
451 extern unsigned int host_info_ebx;
452 extern unsigned int host_info_ecx;
453 extern unsigned int host_info_edx;
458 int hv_ringbuffer_init(struct hv_ring_buffer_info *ring_info,
459 struct page *pages, u32 pagecnt);
461 void hv_ringbuffer_cleanup(struct hv_ring_buffer_info *ring_info);
463 int hv_ringbuffer_write(struct vmbus_channel *channel,
464 struct kvec *kv_list,
465 u32 kv_count, bool lock,
468 int hv_ringbuffer_read(struct vmbus_channel *channel,
469 void *buffer, u32 buflen, u32 *buffer_actual_len,
470 u64 *requestid, bool raw);
472 void hv_ringbuffer_get_debuginfo(struct hv_ring_buffer_info *ring_info,
473 struct hv_ring_buffer_debug_info *debug_info);
475 void hv_begin_read(struct hv_ring_buffer_info *rbi);
477 u32 hv_end_read(struct hv_ring_buffer_info *rbi);
480 * Maximum channels is determined by the size of the interrupt page
481 * which is PAGE_SIZE. 1/2 of PAGE_SIZE is for send endpoint interrupt
482 * and the other is receive endpoint interrupt
484 #define MAX_NUM_CHANNELS ((PAGE_SIZE >> 1) << 3) /* 16348 channels */
486 /* The value here must be in multiple of 32 */
487 /* TODO: Need to make this configurable */
488 #define MAX_NUM_CHANNELS_SUPPORTED 256
491 enum vmbus_connect_state {
498 #define MAX_SIZE_CHANNEL_MESSAGE HV_MESSAGE_PAYLOAD_BYTE_COUNT
500 struct vmbus_connection {
501 enum vmbus_connect_state conn_state;
503 atomic_t next_gpadl_handle;
505 struct completion unload_event;
507 * Represents channel interrupts. Each bit position represents a
508 * channel. When a channel sends an interrupt via VMBUS, it finds its
509 * bit in the sendInterruptPage, set it and calls Hv to generate a port
510 * event. The other end receives the port event and parse the
511 * recvInterruptPage to see which bit is set
518 * 2 pages - 1st page for parent->child notification and 2nd
519 * is child->parent notification
521 struct hv_monitor_page *monitor_pages[2];
522 struct list_head chn_msg_list;
523 spinlock_t channelmsg_lock;
525 /* List of channels */
526 struct list_head chn_list;
527 struct mutex channel_mutex;
529 struct workqueue_struct *work_queue;
533 struct vmbus_msginfo {
534 /* Bookkeeping stuff */
535 struct list_head msglist_entry;
537 /* The message itself */
538 unsigned char msg[0];
542 extern struct vmbus_connection vmbus_connection;
544 enum vmbus_message_handler_type {
545 /* The related handler can sleep. */
548 /* The related handler must NOT sleep. */
549 VMHT_NON_BLOCKING = 1,
552 struct vmbus_channel_message_table_entry {
553 enum vmbus_channel_message_type message_type;
554 enum vmbus_message_handler_type handler_type;
555 void (*message_handler)(struct vmbus_channel_message_header *msg);
558 extern struct vmbus_channel_message_table_entry
559 channel_message_table[CHANNELMSG_COUNT];
561 /* Free the message slot and signal end-of-message if required */
562 static inline void vmbus_signal_eom(struct hv_message *msg, u32 old_msg_type)
565 * On crash we're reading some other CPU's message page and we need
566 * to be careful: this other CPU may already had cleared the header
567 * and the host may already had delivered some other message there.
568 * In case we blindly write msg->header.message_type we're going
569 * to lose it. We can still lose a message of the same type but
570 * we count on the fact that there can only be one
571 * CHANNELMSG_UNLOAD_RESPONSE and we don't care about other messages
574 if (cmpxchg(&msg->header.message_type, old_msg_type,
575 HVMSG_NONE) != old_msg_type)
579 * Make sure the write to MessageType (ie set to
580 * HVMSG_NONE) happens before we read the
581 * MessagePending and EOMing. Otherwise, the EOMing
582 * will not deliver any more messages since there is
587 if (msg->header.message_flags.msg_pending) {
589 * This will cause message queue rescan to
590 * possibly deliver another msg from the
593 wrmsrl(HV_X64_MSR_EOM, 0);
597 /* General vmbus interface */
599 struct hv_device *vmbus_device_create(const uuid_le *type,
600 const uuid_le *instance,
601 struct vmbus_channel *channel);
603 int vmbus_device_register(struct hv_device *child_device_obj);
604 void vmbus_device_unregister(struct hv_device *device_obj);
607 /* VmbusChildDeviceDestroy( */
608 /* struct hv_device *); */
610 struct vmbus_channel *relid2channel(u32 relid);
612 void vmbus_free_channels(void);
614 /* Connection interface */
616 int vmbus_connect(void);
617 void vmbus_disconnect(void);
619 int vmbus_post_msg(void *buffer, size_t buflen, bool can_sleep);
621 void vmbus_on_event(unsigned long data);
622 void vmbus_on_msg_dpc(unsigned long data);
624 int hv_kvp_init(struct hv_util_service *);
625 void hv_kvp_deinit(void);
626 void hv_kvp_onchannelcallback(void *);
628 int hv_vss_init(struct hv_util_service *);
629 void hv_vss_deinit(void);
630 void hv_vss_onchannelcallback(void *);
632 int hv_fcopy_init(struct hv_util_service *);
633 void hv_fcopy_deinit(void);
634 void hv_fcopy_onchannelcallback(void *);
635 void vmbus_initiate_unload(bool crash);
637 static inline void hv_poll_channel(struct vmbus_channel *channel,
643 smp_call_function_single(channel->target_cpu, cb, channel, true);
646 enum hvutil_device_state {
647 HVUTIL_DEVICE_INIT = 0, /* driver is loaded, waiting for userspace */
648 HVUTIL_READY, /* userspace is registered */
649 HVUTIL_HOSTMSG_RECEIVED, /* message from the host was received */
650 HVUTIL_USERSPACE_REQ, /* request to userspace was sent */
651 HVUTIL_USERSPACE_RECV, /* reply from userspace was received */
652 HVUTIL_DEVICE_DYING, /* driver unload is in progress */
655 #endif /* _HYPERV_VMBUS_H */