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 60
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 synthetic interrupt controller message constants. */
77 #define HV_MESSAGE_SIZE (256)
78 #define HV_MESSAGE_PAYLOAD_BYTE_COUNT (240)
79 #define HV_MESSAGE_PAYLOAD_QWORD_COUNT (30)
80 #define HV_ANY_VP (0xFFFFFFFF)
82 /* Define synthetic interrupt controller flag constants. */
83 #define HV_EVENT_FLAGS_COUNT (256 * 8)
84 #define HV_EVENT_FLAGS_BYTE_COUNT (256)
85 #define HV_EVENT_FLAGS_DWORD_COUNT (256 / sizeof(u32))
87 /* Define hypervisor message types. */
88 enum hv_message_type {
89 HVMSG_NONE = 0x00000000,
91 /* Memory access messages. */
92 HVMSG_UNMAPPED_GPA = 0x80000000,
93 HVMSG_GPA_INTERCEPT = 0x80000001,
95 /* Timer notification messages. */
96 HVMSG_TIMER_EXPIRED = 0x80000010,
99 HVMSG_INVALID_VP_REGISTER_VALUE = 0x80000020,
100 HVMSG_UNRECOVERABLE_EXCEPTION = 0x80000021,
101 HVMSG_UNSUPPORTED_FEATURE = 0x80000022,
103 /* Trace buffer complete messages. */
104 HVMSG_EVENTLOG_BUFFERCOMPLETE = 0x80000040,
106 /* Platform-specific processor intercept messages. */
107 HVMSG_X64_IOPORT_INTERCEPT = 0x80010000,
108 HVMSG_X64_MSR_INTERCEPT = 0x80010001,
109 HVMSG_X64_CPUID_INTERCEPT = 0x80010002,
110 HVMSG_X64_EXCEPTION_INTERCEPT = 0x80010003,
111 HVMSG_X64_APIC_EOI = 0x80010004,
112 HVMSG_X64_LEGACY_FP_ERROR = 0x80010005
115 #define HV_SYNIC_STIMER_COUNT (4)
117 /* Define invalid partition identifier. */
118 #define HV_PARTITION_ID_INVALID ((u64)0x0)
120 /* Define port identifier type. */
129 /* Define port type. */
136 /* Define port information structure. */
137 struct hv_port_info {
138 enum hv_port_type port_type;
149 u16 base_flag_number;
160 struct hv_connection_info {
161 enum hv_port_type port_type;
166 } message_connection_info;
169 } event_connection_info;
172 } monitor_connection_info;
176 /* Define synthetic interrupt controller message flags. */
177 union hv_message_flags {
185 /* Define synthetic interrupt controller message header. */
186 struct hv_message_header {
187 enum hv_message_type message_type;
189 union hv_message_flags message_flags;
193 union hv_port_id port;
198 * Timer configuration register.
200 union hv_timer_config {
214 /* Define timer message payload structure. */
215 struct hv_timer_message_payload {
218 u64 expiration_time; /* When the timer expired */
219 u64 delivery_time; /* When the message was delivered */
222 /* Define synthetic interrupt controller message format. */
224 struct hv_message_header header;
226 u64 payload[HV_MESSAGE_PAYLOAD_QWORD_COUNT];
230 /* Define the number of message buffers associated with each port. */
231 #define HV_PORT_MESSAGE_BUFFER_COUNT (16)
233 /* Define the synthetic interrupt message page layout. */
234 struct hv_message_page {
235 struct hv_message sint_message[HV_SYNIC_SINT_COUNT];
238 /* Define the synthetic interrupt controller event flags format. */
239 union hv_synic_event_flags {
240 u8 flags8[HV_EVENT_FLAGS_BYTE_COUNT];
241 u32 flags32[HV_EVENT_FLAGS_DWORD_COUNT];
244 /* Define the synthetic interrupt flags page layout. */
245 struct hv_synic_event_flags_page {
246 union hv_synic_event_flags sintevent_flags[HV_SYNIC_SINT_COUNT];
249 /* Define SynIC control register. */
250 union hv_synic_scontrol {
258 /* Define synthetic interrupt source. */
259 union hv_synic_sint {
270 /* Define the format of the SIMP register */
271 union hv_synic_simp {
276 u64 base_simp_gpa:52;
280 /* Define the format of the SIEFP register */
281 union hv_synic_siefp {
286 u64 base_siefp_gpa:52;
290 /* Definitions for the monitored notification facility */
291 union hv_monitor_trigger_group {
299 struct hv_monitor_parameter {
300 union hv_connection_id connectionid;
305 union hv_monitor_trigger_state {
314 /* struct hv_monitor_page Layout */
315 /* ------------------------------------------------------ */
316 /* | 0 | TriggerState (4 bytes) | Rsvd1 (4 bytes) | */
317 /* | 8 | TriggerGroup[0] | */
318 /* | 10 | TriggerGroup[1] | */
319 /* | 18 | TriggerGroup[2] | */
320 /* | 20 | TriggerGroup[3] | */
321 /* | 28 | Rsvd2[0] | */
322 /* | 30 | Rsvd2[1] | */
323 /* | 38 | Rsvd2[2] | */
324 /* | 40 | NextCheckTime[0][0] | NextCheckTime[0][1] | */
326 /* | 240 | Latency[0][0..3] | */
327 /* | 340 | Rsvz3[0] | */
328 /* | 440 | Parameter[0][0] | */
329 /* | 448 | Parameter[0][1] | */
331 /* | 840 | Rsvd4[0] | */
332 /* ------------------------------------------------------ */
333 struct hv_monitor_page {
334 union hv_monitor_trigger_state trigger_state;
337 union hv_monitor_trigger_group trigger_group[4];
340 s32 next_checktime[4][32];
345 struct hv_monitor_parameter parameter[4][32];
350 /* Declare the various hypercall operations. */
352 HVCALL_POST_MESSAGE = 0x005c,
353 HVCALL_SIGNAL_EVENT = 0x005d,
356 /* Definition of the hv_post_message hypercall input structure. */
357 struct hv_input_post_message {
358 union hv_connection_id connectionid;
360 enum hv_message_type message_type;
362 u64 payload[HV_MESSAGE_PAYLOAD_QWORD_COUNT];
366 * Versioning definitions used for guests reporting themselves to the
367 * hypervisor, and visa versa.
370 /* Version info reported by guest OS's */
371 enum hv_guest_os_vendor {
372 HVGUESTOS_VENDOR_MICROSOFT = 0x0001
375 enum hv_guest_os_microsoft_ids {
376 HVGUESTOS_MICROSOFT_UNDEFINED = 0x00,
377 HVGUESTOS_MICROSOFT_MSDOS = 0x01,
378 HVGUESTOS_MICROSOFT_WINDOWS3X = 0x02,
379 HVGUESTOS_MICROSOFT_WINDOWS9X = 0x03,
380 HVGUESTOS_MICROSOFT_WINDOWSNT = 0x04,
381 HVGUESTOS_MICROSOFT_WINDOWSCE = 0x05
385 * Declare the MSR used to identify the guest OS.
387 #define HV_X64_MSR_GUEST_OS_ID 0x40000000
389 union hv_x64_msr_guest_os_id_contents {
393 u64 service_version:8; /* Service Pack, etc. */
396 u64 os_id:8; /* enum hv_guest_os_microsoft_ids (if Vendor=MS) */
397 u64 vendor_id:16; /* enum hv_guest_os_vendor */
402 * Declare the MSR used to setup pages used to communicate with the hypervisor.
404 #define HV_X64_MSR_HYPERCALL 0x40000001
406 union hv_x64_msr_hypercall_contents {
411 u64 guest_physical_address:52;
417 VMBUS_MESSAGE_CONNECTION_ID = 1,
418 VMBUS_MESSAGE_PORT_ID = 1,
419 VMBUS_EVENT_CONNECTION_ID = 2,
420 VMBUS_EVENT_PORT_ID = 2,
421 VMBUS_MONITOR_CONNECTION_ID = 3,
422 VMBUS_MONITOR_PORT_ID = 3,
423 VMBUS_MESSAGE_SINT = 2,
428 #define HV_PRESENT_BIT 0x80000000
431 * The guest OS needs to register the guest ID with the hypervisor.
432 * The guest ID is a 64 bit entity and the structure of this ID is
433 * specified in the Hyper-V specification:
435 * http://msdn.microsoft.com/en-us/library/windows/hardware/ff542653%28v=vs.85%29.aspx
437 * While the current guideline does not specify how Linux guest ID(s)
438 * need to be generated, our plan is to publish the guidelines for
439 * Linux and other guest operating systems that currently are hosted
440 * on Hyper-V. The implementation here conforms to this yet
441 * unpublished guidelines.
445 * 63 - Indicates if the OS is Open Source or not; 1 is Open Source
446 * 62:56 - Os Type; Linux is 0x100
447 * 55:48 - Distro specific identification
448 * 47:16 - Linux kernel version number
449 * 15:0 - Distro specific identification
454 #define HV_LINUX_VENDOR_ID 0x8100
457 * Generate the guest ID based on the guideline described above.
460 static inline __u64 generate_guest_id(__u8 d_info1, __u32 kernel_version,
465 guest_id = (((__u64)HV_LINUX_VENDOR_ID) << 48);
466 guest_id |= (((__u64)(d_info1)) << 48);
467 guest_id |= (((__u64)(kernel_version)) << 16);
468 guest_id |= ((__u64)(d_info2));
474 #define HV_CPU_POWER_MANAGEMENT (1 << 0)
475 #define HV_RECOMMENDATIONS_MAX 4
478 #define HV_CAPS_MAX 8
481 #define HV_HYPERCALL_PARAM_ALIGN sizeof(u64)
484 /* Service definitions */
486 #define HV_SERVICE_PARENT_PORT (0)
487 #define HV_SERVICE_PARENT_CONNECTION (0)
489 #define HV_SERVICE_CONNECT_RESPONSE_SUCCESS (0)
490 #define HV_SERVICE_CONNECT_RESPONSE_INVALID_PARAMETER (1)
491 #define HV_SERVICE_CONNECT_RESPONSE_UNKNOWN_SERVICE (2)
492 #define HV_SERVICE_CONNECT_RESPONSE_CONNECTION_REJECTED (3)
494 #define HV_SERVICE_CONNECT_REQUEST_MESSAGE_ID (1)
495 #define HV_SERVICE_CONNECT_RESPONSE_MESSAGE_ID (2)
496 #define HV_SERVICE_DISCONNECT_REQUEST_MESSAGE_ID (3)
497 #define HV_SERVICE_DISCONNECT_RESPONSE_MESSAGE_ID (4)
498 #define HV_SERVICE_MAX_MESSAGE_ID (4)
500 #define HV_SERVICE_PROTOCOL_VERSION (0x0010)
501 #define HV_CONNECT_PAYLOAD_BYTE_COUNT 64
503 /* #define VMBUS_REVISION_NUMBER 6 */
505 /* Our local vmbus's port and connection id. Anything >0 is fine */
506 /* #define VMBUS_PORT_ID 11 */
508 /* 628180B8-308D-4c5e-B7DB-1BEB62E62EF4 */
509 static const uuid_le VMBUS_SERVICE_ID = {
511 0xb8, 0x80, 0x81, 0x62, 0x8d, 0x30, 0x5e, 0x4c,
512 0xb7, 0xdb, 0x1b, 0xeb, 0x62, 0xe6, 0x2e, 0xf4
519 /* We only support running on top of Hyper-V
520 * So at this point this really can only contain the Hyper-V ID
524 void *hypercall_page;
527 bool synic_initialized;
529 void *synic_message_page[NR_CPUS];
530 void *synic_event_page[NR_CPUS];
532 * Hypervisor's notion of virtual processor ID is different from
533 * Linux' notion of CPU ID. This information can only be retrieved
534 * in the context of the calling CPU. Setup a map for easy access
535 * to this information:
537 * vp_index[a] is the Hyper-V's processor ID corresponding to
540 u32 vp_index[NR_CPUS];
542 * Starting with win8, we can take channel interrupts on any CPU;
543 * we will manage the tasklet that handles events on a per CPU
546 struct tasklet_struct *event_dpc[NR_CPUS];
548 * To optimize the mapping of relid to channel, maintain
549 * per-cpu list of the channels based on their CPU affinity.
551 struct list_head percpu_list[NR_CPUS];
553 * buffer to post messages to the host.
555 void *post_msg_page[NR_CPUS];
557 * Support PV clockevent device.
559 struct clock_event_device *clk_evt[NR_CPUS];
561 * To manage allocations in a NUMA node.
562 * Array indexed by numa node ID.
564 struct cpumask *hv_numa_map;
567 extern struct hv_context hv_context;
569 struct ms_hyperv_tsc_page {
570 volatile u32 tsc_sequence;
572 volatile u64 tsc_scale;
573 volatile s64 tsc_offset;
577 struct hv_ring_buffer_debug_info {
578 u32 current_interrupt_mask;
579 u32 current_read_index;
580 u32 current_write_index;
581 u32 bytes_avail_toread;
582 u32 bytes_avail_towrite;
587 extern int hv_init(void);
589 extern void hv_cleanup(bool crash);
591 extern int hv_post_message(union hv_connection_id connection_id,
592 enum hv_message_type message_type,
593 void *payload, size_t payload_size);
595 extern u16 hv_signal_event(void *con_id);
597 extern int hv_synic_alloc(void);
599 extern void hv_synic_free(void);
601 extern void hv_synic_init(void *irqarg);
603 extern void hv_synic_cleanup(void *arg);
605 extern void hv_synic_clockevents_cleanup(void);
608 * Host version information.
610 extern unsigned int host_info_eax;
611 extern unsigned int host_info_ebx;
612 extern unsigned int host_info_ecx;
613 extern unsigned int host_info_edx;
618 int hv_ringbuffer_init(struct hv_ring_buffer_info *ring_info, void *buffer,
621 void hv_ringbuffer_cleanup(struct hv_ring_buffer_info *ring_info);
623 int hv_ringbuffer_write(struct hv_ring_buffer_info *ring_info,
624 struct kvec *kv_list,
625 u32 kv_count, bool *signal);
627 int hv_ringbuffer_peek(struct hv_ring_buffer_info *ring_info, void *buffer,
630 int hv_ringbuffer_read(struct hv_ring_buffer_info *ring_info,
633 u32 offset, bool *signal);
636 void hv_ringbuffer_get_debuginfo(struct hv_ring_buffer_info *ring_info,
637 struct hv_ring_buffer_debug_info *debug_info);
639 void hv_begin_read(struct hv_ring_buffer_info *rbi);
641 u32 hv_end_read(struct hv_ring_buffer_info *rbi);
644 * Maximum channels is determined by the size of the interrupt page
645 * which is PAGE_SIZE. 1/2 of PAGE_SIZE is for send endpoint interrupt
646 * and the other is receive endpoint interrupt
648 #define MAX_NUM_CHANNELS ((PAGE_SIZE >> 1) << 3) /* 16348 channels */
650 /* The value here must be in multiple of 32 */
651 /* TODO: Need to make this configurable */
652 #define MAX_NUM_CHANNELS_SUPPORTED 256
655 enum vmbus_connect_state {
662 #define MAX_SIZE_CHANNEL_MESSAGE HV_MESSAGE_PAYLOAD_BYTE_COUNT
664 struct vmbus_connection {
665 enum vmbus_connect_state conn_state;
667 atomic_t next_gpadl_handle;
669 struct completion unload_event;
671 * Represents channel interrupts. Each bit position represents a
672 * channel. When a channel sends an interrupt via VMBUS, it finds its
673 * bit in the sendInterruptPage, set it and calls Hv to generate a port
674 * event. The other end receives the port event and parse the
675 * recvInterruptPage to see which bit is set
682 * 2 pages - 1st page for parent->child notification and 2nd
683 * is child->parent notification
685 struct hv_monitor_page *monitor_pages[2];
686 struct list_head chn_msg_list;
687 spinlock_t channelmsg_lock;
689 /* List of channels */
690 struct list_head chn_list;
691 spinlock_t channel_lock;
693 struct workqueue_struct *work_queue;
697 struct vmbus_msginfo {
698 /* Bookkeeping stuff */
699 struct list_head msglist_entry;
701 /* The message itself */
702 unsigned char msg[0];
706 extern struct vmbus_connection vmbus_connection;
708 enum vmbus_message_handler_type {
709 /* The related handler can sleep. */
712 /* The related handler must NOT sleep. */
713 VMHT_NON_BLOCKING = 1,
716 struct vmbus_channel_message_table_entry {
717 enum vmbus_channel_message_type message_type;
718 enum vmbus_message_handler_type handler_type;
719 void (*message_handler)(struct vmbus_channel_message_header *msg);
722 extern struct vmbus_channel_message_table_entry
723 channel_message_table[CHANNELMSG_COUNT];
725 /* General vmbus interface */
727 struct hv_device *vmbus_device_create(const uuid_le *type,
728 const uuid_le *instance,
729 struct vmbus_channel *channel);
731 int vmbus_device_register(struct hv_device *child_device_obj);
732 void vmbus_device_unregister(struct hv_device *device_obj);
735 /* VmbusChildDeviceDestroy( */
736 /* struct hv_device *); */
738 struct vmbus_channel *relid2channel(u32 relid);
740 void vmbus_free_channels(void);
742 /* Connection interface */
744 int vmbus_connect(void);
745 void vmbus_disconnect(void);
747 int vmbus_post_msg(void *buffer, size_t buflen);
749 int vmbus_set_event(struct vmbus_channel *channel);
751 void vmbus_on_event(unsigned long data);
753 int hv_kvp_init(struct hv_util_service *);
754 void hv_kvp_deinit(void);
755 void hv_kvp_onchannelcallback(void *);
757 int hv_vss_init(struct hv_util_service *);
758 void hv_vss_deinit(void);
759 void hv_vss_onchannelcallback(void *);
761 int hv_fcopy_init(struct hv_util_service *);
762 void hv_fcopy_deinit(void);
763 void hv_fcopy_onchannelcallback(void *);
764 void vmbus_initiate_unload(void);
766 static inline void hv_poll_channel(struct vmbus_channel *channel,
772 smp_call_function_single(channel->target_cpu, cb, channel, true);
775 enum hvutil_device_state {
776 HVUTIL_DEVICE_INIT = 0, /* driver is loaded, waiting for userspace */
777 HVUTIL_READY, /* userspace is registered */
778 HVUTIL_HOSTMSG_RECEIVED, /* message from the host was received */
779 HVUTIL_USERSPACE_REQ, /* request to userspace was sent */
780 HVUTIL_USERSPACE_RECV, /* reply from userspace was received */
781 HVUTIL_DEVICE_DYING, /* driver unload is in progress */
784 #endif /* _HYPERV_VMBUS_H */