/* * * Copyright (c) 2011, Microsoft Corporation. * * This program is free software; you can redistribute it and/or modify it * under the terms and conditions of the GNU General Public License, * version 2, as published by the Free Software Foundation. * * This program is distributed in the hope it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for * more details. * * You should have received a copy of the GNU General Public License along with * this program; if not, write to the Free Software Foundation, Inc., 59 Temple * Place - Suite 330, Boston, MA 02111-1307 USA. * * Authors: * Haiyang Zhang * Hank Janssen * K. Y. Srinivasan * */ #ifndef _HYPERV_VMBUS_H #define _HYPERV_VMBUS_H #include #include #include #include /* * Timeout for services such as KVP and fcopy. */ #define HV_UTIL_TIMEOUT 30 /* * Timeout for guest-host handshake for services. */ #define HV_UTIL_NEGO_TIMEOUT 55 /* * The below CPUID leaves are present if VersionAndFeatures.HypervisorPresent * is set by CPUID(HVCPUID_VERSION_FEATURES). */ enum hv_cpuid_function { HVCPUID_VERSION_FEATURES = 0x00000001, HVCPUID_VENDOR_MAXFUNCTION = 0x40000000, HVCPUID_INTERFACE = 0x40000001, /* * The remaining functions depend on the value of * HVCPUID_INTERFACE */ HVCPUID_VERSION = 0x40000002, HVCPUID_FEATURES = 0x40000003, HVCPUID_ENLIGHTENMENT_INFO = 0x40000004, HVCPUID_IMPLEMENTATION_LIMITS = 0x40000005, }; #define HV_FEATURE_GUEST_CRASH_MSR_AVAILABLE 0x400 #define HV_X64_MSR_CRASH_P0 0x40000100 #define HV_X64_MSR_CRASH_P1 0x40000101 #define HV_X64_MSR_CRASH_P2 0x40000102 #define HV_X64_MSR_CRASH_P3 0x40000103 #define HV_X64_MSR_CRASH_P4 0x40000104 #define HV_X64_MSR_CRASH_CTL 0x40000105 #define HV_CRASH_CTL_CRASH_NOTIFY (1ULL << 63) /* Define version of the synthetic interrupt controller. */ #define HV_SYNIC_VERSION (1) #define HV_ANY_VP (0xFFFFFFFF) /* Define synthetic interrupt controller flag constants. */ #define HV_EVENT_FLAGS_COUNT (256 * 8) #define HV_EVENT_FLAGS_BYTE_COUNT (256) #define HV_EVENT_FLAGS_DWORD_COUNT (256 / sizeof(u32)) /* Define invalid partition identifier. */ #define HV_PARTITION_ID_INVALID ((u64)0x0) /* Define port type. */ enum hv_port_type { HVPORT_MSG = 1, HVPORT_EVENT = 2, HVPORT_MONITOR = 3 }; /* Define port information structure. */ struct hv_port_info { enum hv_port_type port_type; u32 padding; union { struct { u32 target_sint; u32 target_vp; u64 rsvdz; } message_port_info; struct { u32 target_sint; u32 target_vp; u16 base_flag_number; u16 flag_count; u32 rsvdz; } event_port_info; struct { u64 monitor_address; u64 rsvdz; } monitor_port_info; }; }; struct hv_connection_info { enum hv_port_type port_type; u32 padding; union { struct { u64 rsvdz; } message_connection_info; struct { u64 rsvdz; } event_connection_info; struct { u64 monitor_address; } monitor_connection_info; }; }; /* * Timer configuration register. */ union hv_timer_config { u64 as_uint64; struct { u64 enable:1; u64 periodic:1; u64 lazy:1; u64 auto_enable:1; u64 reserved_z0:12; u64 sintx:4; u64 reserved_z1:44; }; }; /* Define the number of message buffers associated with each port. */ #define HV_PORT_MESSAGE_BUFFER_COUNT (16) /* Define the synthetic interrupt controller event flags format. */ union hv_synic_event_flags { u8 flags8[HV_EVENT_FLAGS_BYTE_COUNT]; u32 flags32[HV_EVENT_FLAGS_DWORD_COUNT]; }; /* Define the synthetic interrupt flags page layout. */ struct hv_synic_event_flags_page { union hv_synic_event_flags sintevent_flags[HV_SYNIC_SINT_COUNT]; }; /* Define SynIC control register. */ union hv_synic_scontrol { u64 as_uint64; struct { u64 enable:1; u64 reserved:63; }; }; /* Define synthetic interrupt source. */ union hv_synic_sint { u64 as_uint64; struct { u64 vector:8; u64 reserved1:8; u64 masked:1; u64 auto_eoi:1; u64 reserved2:46; }; }; /* Define the format of the SIMP register */ union hv_synic_simp { u64 as_uint64; struct { u64 simp_enabled:1; u64 preserved:11; u64 base_simp_gpa:52; }; }; /* Define the format of the SIEFP register */ union hv_synic_siefp { u64 as_uint64; struct { u64 siefp_enabled:1; u64 preserved:11; u64 base_siefp_gpa:52; }; }; /* Definitions for the monitored notification facility */ union hv_monitor_trigger_group { u64 as_uint64; struct { u32 pending; u32 armed; }; }; struct hv_monitor_parameter { union hv_connection_id connectionid; u16 flagnumber; u16 rsvdz; }; union hv_monitor_trigger_state { u32 asu32; struct { u32 group_enable:4; u32 rsvdz:28; }; }; /* struct hv_monitor_page Layout */ /* ------------------------------------------------------ */ /* | 0 | TriggerState (4 bytes) | Rsvd1 (4 bytes) | */ /* | 8 | TriggerGroup[0] | */ /* | 10 | TriggerGroup[1] | */ /* | 18 | TriggerGroup[2] | */ /* | 20 | TriggerGroup[3] | */ /* | 28 | Rsvd2[0] | */ /* | 30 | Rsvd2[1] | */ /* | 38 | Rsvd2[2] | */ /* | 40 | NextCheckTime[0][0] | NextCheckTime[0][1] | */ /* | ... | */ /* | 240 | Latency[0][0..3] | */ /* | 340 | Rsvz3[0] | */ /* | 440 | Parameter[0][0] | */ /* | 448 | Parameter[0][1] | */ /* | ... | */ /* | 840 | Rsvd4[0] | */ /* ------------------------------------------------------ */ struct hv_monitor_page { union hv_monitor_trigger_state trigger_state; u32 rsvdz1; union hv_monitor_trigger_group trigger_group[4]; u64 rsvdz2[3]; s32 next_checktime[4][32]; u16 latency[4][32]; u64 rsvdz3[32]; struct hv_monitor_parameter parameter[4][32]; u8 rsvdz4[1984]; }; /* Definition of the hv_post_message hypercall input structure. */ struct hv_input_post_message { union hv_connection_id connectionid; u32 reserved; u32 message_type; u32 payload_size; u64 payload[HV_MESSAGE_PAYLOAD_QWORD_COUNT]; }; /* * Versioning definitions used for guests reporting themselves to the * hypervisor, and visa versa. */ /* Version info reported by guest OS's */ enum hv_guest_os_vendor { HVGUESTOS_VENDOR_MICROSOFT = 0x0001 }; enum hv_guest_os_microsoft_ids { HVGUESTOS_MICROSOFT_UNDEFINED = 0x00, HVGUESTOS_MICROSOFT_MSDOS = 0x01, HVGUESTOS_MICROSOFT_WINDOWS3X = 0x02, HVGUESTOS_MICROSOFT_WINDOWS9X = 0x03, HVGUESTOS_MICROSOFT_WINDOWSNT = 0x04, HVGUESTOS_MICROSOFT_WINDOWSCE = 0x05 }; /* * Declare the MSR used to identify the guest OS. */ #define HV_X64_MSR_GUEST_OS_ID 0x40000000 union hv_x64_msr_guest_os_id_contents { u64 as_uint64; struct { u64 build_number:16; u64 service_version:8; /* Service Pack, etc. */ u64 minor_version:8; u64 major_version:8; u64 os_id:8; /* enum hv_guest_os_microsoft_ids (if Vendor=MS) */ u64 vendor_id:16; /* enum hv_guest_os_vendor */ }; }; /* * Declare the MSR used to setup pages used to communicate with the hypervisor. */ #define HV_X64_MSR_HYPERCALL 0x40000001 union hv_x64_msr_hypercall_contents { u64 as_uint64; struct { u64 enable:1; u64 reserved:11; u64 guest_physical_address:52; }; }; enum { VMBUS_MESSAGE_CONNECTION_ID = 1, VMBUS_MESSAGE_PORT_ID = 1, VMBUS_EVENT_CONNECTION_ID = 2, VMBUS_EVENT_PORT_ID = 2, VMBUS_MONITOR_CONNECTION_ID = 3, VMBUS_MONITOR_PORT_ID = 3, VMBUS_MESSAGE_SINT = 2, }; /* #defines */ #define HV_PRESENT_BIT 0x80000000 /* * The guest OS needs to register the guest ID with the hypervisor. * The guest ID is a 64 bit entity and the structure of this ID is * specified in the Hyper-V specification: * * http://msdn.microsoft.com/en-us/library/windows/hardware/ff542653%28v=vs.85%29.aspx * * While the current guideline does not specify how Linux guest ID(s) * need to be generated, our plan is to publish the guidelines for * Linux and other guest operating systems that currently are hosted * on Hyper-V. The implementation here conforms to this yet * unpublished guidelines. * * * Bit(s) * 63 - Indicates if the OS is Open Source or not; 1 is Open Source * 62:56 - Os Type; Linux is 0x100 * 55:48 - Distro specific identification * 47:16 - Linux kernel version number * 15:0 - Distro specific identification * * */ #define HV_LINUX_VENDOR_ID 0x8100 /* * Generate the guest ID based on the guideline described above. */ static inline __u64 generate_guest_id(__u8 d_info1, __u32 kernel_version, __u16 d_info2) { __u64 guest_id = 0; guest_id = (((__u64)HV_LINUX_VENDOR_ID) << 48); guest_id |= (((__u64)(d_info1)) << 48); guest_id |= (((__u64)(kernel_version)) << 16); guest_id |= ((__u64)(d_info2)); return guest_id; } #define HV_CPU_POWER_MANAGEMENT (1 << 0) #define HV_RECOMMENDATIONS_MAX 4 #define HV_X64_MAX 5 #define HV_CAPS_MAX 8 #define HV_HYPERCALL_PARAM_ALIGN sizeof(u64) /* Service definitions */ #define HV_SERVICE_PARENT_PORT (0) #define HV_SERVICE_PARENT_CONNECTION (0) #define HV_SERVICE_CONNECT_RESPONSE_SUCCESS (0) #define HV_SERVICE_CONNECT_RESPONSE_INVALID_PARAMETER (1) #define HV_SERVICE_CONNECT_RESPONSE_UNKNOWN_SERVICE (2) #define HV_SERVICE_CONNECT_RESPONSE_CONNECTION_REJECTED (3) #define HV_SERVICE_CONNECT_REQUEST_MESSAGE_ID (1) #define HV_SERVICE_CONNECT_RESPONSE_MESSAGE_ID (2) #define HV_SERVICE_DISCONNECT_REQUEST_MESSAGE_ID (3) #define HV_SERVICE_DISCONNECT_RESPONSE_MESSAGE_ID (4) #define HV_SERVICE_MAX_MESSAGE_ID (4) #define HV_SERVICE_PROTOCOL_VERSION (0x0010) #define HV_CONNECT_PAYLOAD_BYTE_COUNT 64 /* #define VMBUS_REVISION_NUMBER 6 */ /* Our local vmbus's port and connection id. Anything >0 is fine */ /* #define VMBUS_PORT_ID 11 */ /* 628180B8-308D-4c5e-B7DB-1BEB62E62EF4 */ static const uuid_le VMBUS_SERVICE_ID = { .b = { 0xb8, 0x80, 0x81, 0x62, 0x8d, 0x30, 0x5e, 0x4c, 0xb7, 0xdb, 0x1b, 0xeb, 0x62, 0xe6, 0x2e, 0xf4 }, }; struct hv_context { /* We only support running on top of Hyper-V * So at this point this really can only contain the Hyper-V ID */ u64 guestid; void *hypercall_page; void *tsc_page; bool synic_initialized; void *synic_message_page[NR_CPUS]; void *synic_event_page[NR_CPUS]; /* * Hypervisor's notion of virtual processor ID is different from * Linux' notion of CPU ID. This information can only be retrieved * in the context of the calling CPU. Setup a map for easy access * to this information: * * vp_index[a] is the Hyper-V's processor ID corresponding to * Linux cpuid 'a'. */ u32 vp_index[NR_CPUS]; /* * Starting with win8, we can take channel interrupts on any CPU; * we will manage the tasklet that handles events messages on a per CPU * basis. */ struct tasklet_struct *event_dpc[NR_CPUS]; struct tasklet_struct *msg_dpc[NR_CPUS]; /* * To optimize the mapping of relid to channel, maintain * per-cpu list of the channels based on their CPU affinity. */ struct list_head percpu_list[NR_CPUS]; /* * buffer to post messages to the host. */ void *post_msg_page[NR_CPUS]; /* * Support PV clockevent device. */ struct clock_event_device *clk_evt[NR_CPUS]; /* * To manage allocations in a NUMA node. * Array indexed by numa node ID. */ struct cpumask *hv_numa_map; }; extern struct hv_context hv_context; struct ms_hyperv_tsc_page { volatile u32 tsc_sequence; u32 reserved1; volatile u64 tsc_scale; volatile s64 tsc_offset; u64 reserved2[509]; }; struct hv_ring_buffer_debug_info { u32 current_interrupt_mask; u32 current_read_index; u32 current_write_index; u32 bytes_avail_toread; u32 bytes_avail_towrite; }; /* Hv Interface */ extern int hv_init(void); extern void hv_cleanup(bool crash); extern int hv_post_message(union hv_connection_id connection_id, enum hv_message_type message_type, void *payload, size_t payload_size); extern int hv_synic_alloc(void); extern void hv_synic_free(void); extern void hv_synic_init(void *irqarg); extern void hv_synic_cleanup(void *arg); extern void hv_synic_clockevents_cleanup(void); /* * Host version information. */ extern unsigned int host_info_eax; extern unsigned int host_info_ebx; extern unsigned int host_info_ecx; extern unsigned int host_info_edx; /* Interface */ int hv_ringbuffer_init(struct hv_ring_buffer_info *ring_info, struct page *pages, u32 pagecnt); void hv_ringbuffer_cleanup(struct hv_ring_buffer_info *ring_info); int hv_ringbuffer_write(struct vmbus_channel *channel, struct kvec *kv_list, u32 kv_count, bool lock, bool kick_q); int hv_ringbuffer_read(struct vmbus_channel *channel, void *buffer, u32 buflen, u32 *buffer_actual_len, u64 *requestid, bool raw); void hv_ringbuffer_get_debuginfo(struct hv_ring_buffer_info *ring_info, struct hv_ring_buffer_debug_info *debug_info); void hv_begin_read(struct hv_ring_buffer_info *rbi); u32 hv_end_read(struct hv_ring_buffer_info *rbi); /* * Maximum channels is determined by the size of the interrupt page * which is PAGE_SIZE. 1/2 of PAGE_SIZE is for send endpoint interrupt * and the other is receive endpoint interrupt */ #define MAX_NUM_CHANNELS ((PAGE_SIZE >> 1) << 3) /* 16348 channels */ /* The value here must be in multiple of 32 */ /* TODO: Need to make this configurable */ #define MAX_NUM_CHANNELS_SUPPORTED 256 enum vmbus_connect_state { DISCONNECTED, CONNECTING, CONNECTED, DISCONNECTING }; #define MAX_SIZE_CHANNEL_MESSAGE HV_MESSAGE_PAYLOAD_BYTE_COUNT struct vmbus_connection { enum vmbus_connect_state conn_state; atomic_t next_gpadl_handle; struct completion unload_event; /* * Represents channel interrupts. Each bit position represents a * channel. When a channel sends an interrupt via VMBUS, it finds its * bit in the sendInterruptPage, set it and calls Hv to generate a port * event. The other end receives the port event and parse the * recvInterruptPage to see which bit is set */ void *int_page; void *send_int_page; void *recv_int_page; /* * 2 pages - 1st page for parent->child notification and 2nd * is child->parent notification */ struct hv_monitor_page *monitor_pages[2]; struct list_head chn_msg_list; spinlock_t channelmsg_lock; /* List of channels */ struct list_head chn_list; struct mutex channel_mutex; struct workqueue_struct *work_queue; }; struct vmbus_msginfo { /* Bookkeeping stuff */ struct list_head msglist_entry; /* The message itself */ unsigned char msg[0]; }; extern struct vmbus_connection vmbus_connection; enum vmbus_message_handler_type { /* The related handler can sleep. */ VMHT_BLOCKING = 0, /* The related handler must NOT sleep. */ VMHT_NON_BLOCKING = 1, }; struct vmbus_channel_message_table_entry { enum vmbus_channel_message_type message_type; enum vmbus_message_handler_type handler_type; void (*message_handler)(struct vmbus_channel_message_header *msg); }; extern struct vmbus_channel_message_table_entry channel_message_table[CHANNELMSG_COUNT]; /* Free the message slot and signal end-of-message if required */ static inline void vmbus_signal_eom(struct hv_message *msg, u32 old_msg_type) { /* * On crash we're reading some other CPU's message page and we need * to be careful: this other CPU may already had cleared the header * and the host may already had delivered some other message there. * In case we blindly write msg->header.message_type we're going * to lose it. We can still lose a message of the same type but * we count on the fact that there can only be one * CHANNELMSG_UNLOAD_RESPONSE and we don't care about other messages * on crash. */ if (cmpxchg(&msg->header.message_type, old_msg_type, HVMSG_NONE) != old_msg_type) return; /* * Make sure the write to MessageType (ie set to * HVMSG_NONE) happens before we read the * MessagePending and EOMing. Otherwise, the EOMing * will not deliver any more messages since there is * no empty slot */ mb(); if (msg->header.message_flags.msg_pending) { /* * This will cause message queue rescan to * possibly deliver another msg from the * hypervisor */ wrmsrl(HV_X64_MSR_EOM, 0); } } /* General vmbus interface */ struct hv_device *vmbus_device_create(const uuid_le *type, const uuid_le *instance, struct vmbus_channel *channel); int vmbus_device_register(struct hv_device *child_device_obj); void vmbus_device_unregister(struct hv_device *device_obj); /* static void */ /* VmbusChildDeviceDestroy( */ /* struct hv_device *); */ struct vmbus_channel *relid2channel(u32 relid); void vmbus_free_channels(void); /* Connection interface */ int vmbus_connect(void); void vmbus_disconnect(void); int vmbus_post_msg(void *buffer, size_t buflen, bool can_sleep); void vmbus_on_event(unsigned long data); void vmbus_on_msg_dpc(unsigned long data); int hv_kvp_init(struct hv_util_service *); void hv_kvp_deinit(void); void hv_kvp_onchannelcallback(void *); int hv_vss_init(struct hv_util_service *); void hv_vss_deinit(void); void hv_vss_onchannelcallback(void *); int hv_fcopy_init(struct hv_util_service *); void hv_fcopy_deinit(void); void hv_fcopy_onchannelcallback(void *); void vmbus_initiate_unload(bool crash); static inline void hv_poll_channel(struct vmbus_channel *channel, void (*cb)(void *)) { if (!channel) return; smp_call_function_single(channel->target_cpu, cb, channel, true); } enum hvutil_device_state { HVUTIL_DEVICE_INIT = 0, /* driver is loaded, waiting for userspace */ HVUTIL_READY, /* userspace is registered */ HVUTIL_HOSTMSG_RECEIVED, /* message from the host was received */ HVUTIL_USERSPACE_REQ, /* request to userspace was sent */ HVUTIL_USERSPACE_RECV, /* reply from userspace was received */ HVUTIL_DEVICE_DYING, /* driver unload is in progress */ }; #endif /* _HYPERV_VMBUS_H */