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vmw_vmci_defs.h
/* SPDX-License-Identifier: GPL-2.0-only */ /* * VMware VMCI Driver * * Copyright (C) 2012 VMware, Inc. All rights reserved. */ #ifndef _VMW_VMCI_DEF_H_ #define _VMW_VMCI_DEF_H_ #include <linux/atomic.h> #include <linux/bits.h> /* Register offsets. */ #define VMCI_STATUS_ADDR 0x00 #define VMCI_CONTROL_ADDR 0x04 #define VMCI_ICR_ADDR 0x08 #define VMCI_IMR_ADDR 0x0c #define VMCI_DATA_OUT_ADDR 0x10 #define VMCI_DATA_IN_ADDR 0x14 #define VMCI_CAPS_ADDR 0x18 #define VMCI_RESULT_LOW_ADDR 0x1c #define VMCI_RESULT_HIGH_ADDR 0x20 #define VMCI_DATA_OUT_LOW_ADDR 0x24 #define VMCI_DATA_OUT_HIGH_ADDR 0x28 #define VMCI_DATA_IN_LOW_ADDR 0x2c #define VMCI_DATA_IN_HIGH_ADDR 0x30 #define VMCI_GUEST_PAGE_SHIFT 0x34 /* Max number of devices. */ #define VMCI_MAX_DEVICES 1 /* Status register bits. */ #define VMCI_STATUS_INT_ON BIT(0) /* Control register bits. */ #define VMCI_CONTROL_RESET BIT(0) #define VMCI_CONTROL_INT_ENABLE BIT(1) #define VMCI_CONTROL_INT_DISABLE BIT(2) /* Capabilities register bits. */ #define VMCI_CAPS_HYPERCALL BIT(0) #define VMCI_CAPS_GUESTCALL BIT(1) #define VMCI_CAPS_DATAGRAM BIT(2) #define VMCI_CAPS_NOTIFICATIONS BIT(3) #define VMCI_CAPS_PPN64 BIT(4) #define VMCI_CAPS_DMA_DATAGRAM BIT(5) /* Interrupt Cause register bits. */ #define VMCI_ICR_DATAGRAM BIT(0) #define VMCI_ICR_NOTIFICATION BIT(1) #define VMCI_ICR_DMA_DATAGRAM BIT(2) /* Interrupt Mask register bits. */ #define VMCI_IMR_DATAGRAM BIT(0) #define VMCI_IMR_NOTIFICATION BIT(1) #define VMCI_IMR_DMA_DATAGRAM BIT(2) /* * Maximum MSI/MSI-X interrupt vectors in the device. * If VMCI_CAPS_DMA_DATAGRAM is supported by the device, * VMCI_MAX_INTRS_DMA_DATAGRAM vectors are available, * otherwise only VMCI_MAX_INTRS_NOTIFICATION. */ #define VMCI_MAX_INTRS_NOTIFICATION 2 #define VMCI_MAX_INTRS_DMA_DATAGRAM 3 #define VMCI_MAX_INTRS VMCI_MAX_INTRS_DMA_DATAGRAM /* * Supported interrupt vectors. There is one for each ICR value above, * but here they indicate the position in the vector array/message ID. */ enum { VMCI_INTR_DATAGRAM = 0, VMCI_INTR_NOTIFICATION = 1, VMCI_INTR_DMA_DATAGRAM = 2, }; /* * A single VMCI device has an upper limit of 128MB on the amount of * memory that can be used for queue pairs. Since each queue pair * consists of at least two pages, the memory limit also dictates the * number of queue pairs a guest can create. */ #define VMCI_MAX_GUEST_QP_MEMORY ((size_t)(128 * 1024 * 1024)) #define VMCI_MAX_GUEST_QP_COUNT (VMCI_MAX_GUEST_QP_MEMORY / PAGE_SIZE / 2) /* * There can be at most PAGE_SIZE doorbells since there is one doorbell * per byte in the doorbell bitmap page. */ #define VMCI_MAX_GUEST_DOORBELL_COUNT PAGE_SIZE /* * Queues with pre-mapped data pages must be small, so that we don't pin * too much kernel memory (especially on vmkernel). We limit a queuepair to * 32 KB, or 16 KB per queue for symmetrical pairs. */ #define VMCI_MAX_PINNED_QP_MEMORY ((size_t)(32 * 1024)) /* * The version of the VMCI device that supports MMIO access to registers * requests 256KB for BAR1 whereas the version of VMCI that supports * MSI/MSI-X only requests 8KB. The layout of the larger 256KB region is: * - the first 128KB are used for MSI/MSI-X. * - the following 64KB are used for MMIO register access. * - the remaining 64KB are unused. */ #define VMCI_WITH_MMIO_ACCESS_BAR_SIZE ((size_t)(256 * 1024)) #define VMCI_MMIO_ACCESS_OFFSET ((size_t)(128 * 1024)) #define VMCI_MMIO_ACCESS_SIZE ((size_t)(64 * 1024)) /* * For VMCI devices supporting the VMCI_CAPS_DMA_DATAGRAM capability, the * sending and receiving of datagrams can be performed using DMA to/from * a driver allocated buffer. * Sending and receiving will be handled as follows: * - when sending datagrams, the driver initializes the buffer where the * data part will refer to the outgoing VMCI datagram, sets the busy flag * to 1 and writes the address of the buffer to VMCI_DATA_OUT_HIGH_ADDR * and VMCI_DATA_OUT_LOW_ADDR. Writing to VMCI_DATA_OUT_LOW_ADDR triggers * the device processing of the buffer. When the device has processed the * buffer, it will write the result value to the buffer and then clear the * busy flag. * - when receiving datagrams, the driver initializes the buffer where the * data part will describe the receive buffer, clears the busy flag and * writes the address of the buffer to VMCI_DATA_IN_HIGH_ADDR and * VMCI_DATA_IN_LOW_ADDR. Writing to VMCI_DATA_IN_LOW_ADDR triggers the * device processing of the buffer. The device will copy as many available * datagrams into the buffer as possible, and then sets the busy flag. * When the busy flag is set, the driver will process the datagrams in the * buffer. */ struct vmci_data_in_out_header { uint32_t busy; uint32_t opcode; uint32_t size; uint32_t rsvd; uint64_t result; }; struct vmci_sg_elem { uint64_t addr; uint64_t size; }; /* * We have a fixed set of resource IDs available in the VMX. * This allows us to have a very simple implementation since we statically * know how many will create datagram handles. If a new caller arrives and * we have run out of slots we can manually increment the maximum size of * available resource IDs. * * VMCI reserved hypervisor datagram resource IDs. */ enum { VMCI_RESOURCES_QUERY = 0, VMCI_GET_CONTEXT_ID = 1, VMCI_SET_NOTIFY_BITMAP = 2, VMCI_DOORBELL_LINK = 3, VMCI_DOORBELL_UNLINK = 4, VMCI_DOORBELL_NOTIFY = 5, /* * VMCI_DATAGRAM_REQUEST_MAP and VMCI_DATAGRAM_REMOVE_MAP are * obsoleted by the removal of VM to VM communication. */ VMCI_DATAGRAM_REQUEST_MAP = 6, VMCI_DATAGRAM_REMOVE_MAP = 7, VMCI_EVENT_SUBSCRIBE = 8, VMCI_EVENT_UNSUBSCRIBE = 9, VMCI_QUEUEPAIR_ALLOC = 10, VMCI_QUEUEPAIR_DETACH = 11, /* * VMCI_VSOCK_VMX_LOOKUP was assigned to 12 for Fusion 3.0/3.1, * WS 7.0/7.1 and ESX 4.1 */ VMCI_HGFS_TRANSPORT = 13, VMCI_UNITY_PBRPC_REGISTER = 14, VMCI_RPC_PRIVILEGED = 15, VMCI_RPC_UNPRIVILEGED = 16, VMCI_RESOURCE_MAX = 17, }; /* * struct vmci_handle - Ownership information structure * @context: The VMX context ID. * @resource: The resource ID (used for locating in resource hash). * * The vmci_handle structure is used to track resources used within * vmw_vmci. */ struct vmci_handle { u32 context; u32 resource; }; #define vmci_make_handle(_cid, _rid) \ (struct vmci_handle){ .context = _cid, .resource = _rid } static inline bool vmci_handle_is_equal(struct vmci_handle h1, struct vmci_handle h2) { return h1.context == h2.context && h1.resource == h2.resource; } #define VMCI_INVALID_ID ~0 static const struct vmci_handle VMCI_INVALID_HANDLE = { .context = VMCI_INVALID_ID, .resource = VMCI_INVALID_ID }; static inline bool vmci_handle_is_invalid(struct vmci_handle h) { return vmci_handle_is_equal(h, VMCI_INVALID_HANDLE); } /* * The below defines can be used to send anonymous requests. * This also indicates that no response is expected. */ #define VMCI_ANON_SRC_CONTEXT_ID VMCI_INVALID_ID #define VMCI_ANON_SRC_RESOURCE_ID VMCI_INVALID_ID static const struct vmci_handle __maybe_unused VMCI_ANON_SRC_HANDLE = { .context = VMCI_ANON_SRC_CONTEXT_ID, .resource = VMCI_ANON_SRC_RESOURCE_ID }; /* The lowest 16 context ids are reserved for internal use. */ #define VMCI_RESERVED_CID_LIMIT ((u32) 16) /* * Hypervisor context id, used for calling into hypervisor * supplied services from the VM. */ #define VMCI_HYPERVISOR_CONTEXT_ID 0 /* * Well-known context id, a logical context that contains a set of * well-known services. This context ID is now obsolete. */ #define VMCI_WELL_KNOWN_CONTEXT_ID 1 /* * Context ID used by host endpoints. */ #define VMCI_HOST_CONTEXT_ID 2 #define VMCI_CONTEXT_IS_VM(_cid) (VMCI_INVALID_ID != (_cid) && \ (_cid) > VMCI_HOST_CONTEXT_ID) /* * The VMCI_CONTEXT_RESOURCE_ID is used together with vmci_make_handle to make * handles that refer to a specific context. */ #define VMCI_CONTEXT_RESOURCE_ID 0 /* * VMCI error codes. */ enum { VMCI_SUCCESS_QUEUEPAIR_ATTACH = 5, VMCI_SUCCESS_QUEUEPAIR_CREATE = 4, VMCI_SUCCESS_LAST_DETACH = 3, VMCI_SUCCESS_ACCESS_GRANTED = 2, VMCI_SUCCESS_ENTRY_DEAD = 1, VMCI_SUCCESS = 0, VMCI_ERROR_INVALID_RESOURCE = (-1), VMCI_ERROR_INVALID_ARGS = (-2), VMCI_ERROR_NO_MEM = (-3), VMCI_ERROR_DATAGRAM_FAILED = (-4), VMCI_ERROR_MORE_DATA = (-5), VMCI_ERROR_NO_MORE_DATAGRAMS = (-6), VMCI_ERROR_NO_ACCESS = (-7), VMCI_ERROR_NO_HANDLE = (-8), VMCI_ERROR_DUPLICATE_ENTRY = (-9), VMCI_ERROR_DST_UNREACHABLE = (-10), VMCI_ERROR_PAYLOAD_TOO_LARGE = (-11), VMCI_ERROR_INVALID_PRIV = (-12), VMCI_ERROR_GENERIC = (-13), VMCI_ERROR_PAGE_ALREADY_SHARED = (-14), VMCI_ERROR_CANNOT_SHARE_PAGE = (-15), VMCI_ERROR_CANNOT_UNSHARE_PAGE = (-16), VMCI_ERROR_NO_PROCESS = (-17), VMCI_ERROR_NO_DATAGRAM = (-18), VMCI_ERROR_NO_RESOURCES = (-19), VMCI_ERROR_UNAVAILABLE = (-20), VMCI_ERROR_NOT_FOUND = (-21), VMCI_ERROR_ALREADY_EXISTS = (-22), VMCI_ERROR_NOT_PAGE_ALIGNED = (-23), VMCI_ERROR_INVALID_SIZE = (-24), VMCI_ERROR_REGION_ALREADY_SHARED = (-25), VMCI_ERROR_TIMEOUT = (-26), VMCI_ERROR_DATAGRAM_INCOMPLETE = (-27), VMCI_ERROR_INCORRECT_IRQL = (-28), VMCI_ERROR_EVENT_UNKNOWN = (-29), VMCI_ERROR_OBSOLETE = (-30), VMCI_ERROR_QUEUEPAIR_MISMATCH = (-31), VMCI_ERROR_QUEUEPAIR_NOTSET = (-32), VMCI_ERROR_QUEUEPAIR_NOTOWNER = (-33), VMCI_ERROR_QUEUEPAIR_NOTATTACHED = (-34), VMCI_ERROR_QUEUEPAIR_NOSPACE = (-35), VMCI_ERROR_QUEUEPAIR_NODATA = (-36), VMCI_ERROR_BUSMEM_INVALIDATION = (-37), VMCI_ERROR_MODULE_NOT_LOADED = (-38), VMCI_ERROR_DEVICE_NOT_FOUND = (-39), VMCI_ERROR_QUEUEPAIR_NOT_READY = (-40), VMCI_ERROR_WOULD_BLOCK = (-41), /* VMCI clients should return error code within this range */ VMCI_ERROR_CLIENT_MIN = (-500), VMCI_ERROR_CLIENT_MAX = (-550), /* Internal error codes. */ VMCI_SHAREDMEM_ERROR_BAD_CONTEXT = (-1000), }; /* VMCI reserved events. */ enum { /* Only applicable to guest endpoints */ VMCI_EVENT_CTX_ID_UPDATE = 0, /* Applicable to guest and host */ VMCI_EVENT_CTX_REMOVED = 1, /* Only applicable to guest endpoints */ VMCI_EVENT_QP_RESUMED = 2, /* Applicable to guest and host */ VMCI_EVENT_QP_PEER_ATTACH = 3, /* Applicable to guest and host */ VMCI_EVENT_QP_PEER_DETACH = 4, /* * Applicable to VMX and vmk. On vmk, * this event has the Context payload type. */ VMCI_EVENT_MEM_ACCESS_ON = 5, /* * Applicable to VMX and vmk. Same as * above for the payload type. */ VMCI_EVENT_MEM_ACCESS_OFF = 6, VMCI_EVENT_MAX = 7, }; /* * Of the above events, a few are reserved for use in the VMX, and * other endpoints (guest and host kernel) should not use them. For * the rest of the events, we allow both host and guest endpoints to * subscribe to them, to maintain the same API for host and guest * endpoints. */ #define VMCI_EVENT_VALID_VMX(_event) ((_event) == VMCI_EVENT_MEM_ACCESS_ON || \ (_event) == VMCI_EVENT_MEM_ACCESS_OFF) #define VMCI_EVENT_VALID(_event) ((_event) < VMCI_EVENT_MAX && \ !VMCI_EVENT_VALID_VMX(_event)) /* Reserved guest datagram resource ids. */ #define VMCI_EVENT_HANDLER 0 /* * VMCI coarse-grained privileges (per context or host * process/endpoint. An entity with the restricted flag is only * allowed to interact with the hypervisor and trusted entities. */ enum { VMCI_NO_PRIVILEGE_FLAGS = 0, VMCI_PRIVILEGE_FLAG_RESTRICTED = 1, VMCI_PRIVILEGE_FLAG_TRUSTED = 2, VMCI_PRIVILEGE_ALL_FLAGS = (VMCI_PRIVILEGE_FLAG_RESTRICTED | VMCI_PRIVILEGE_FLAG_TRUSTED), VMCI_DEFAULT_PROC_PRIVILEGE_FLAGS = VMCI_NO_PRIVILEGE_FLAGS, VMCI_LEAST_PRIVILEGE_FLAGS = VMCI_PRIVILEGE_FLAG_RESTRICTED, VMCI_MAX_PRIVILEGE_FLAGS = VMCI_PRIVILEGE_FLAG_TRUSTED, }; /* 0 through VMCI_RESERVED_RESOURCE_ID_MAX are reserved. */ #define VMCI_RESERVED_RESOURCE_ID_MAX 1023 /* * Driver version. * * Increment major version when you make an incompatible change. * Compatibility goes both ways (old driver with new executable * as well as new driver with old executable). */ /* Never change VMCI_VERSION_SHIFT_WIDTH */ #define VMCI_VERSION_SHIFT_WIDTH 16 #define VMCI_MAKE_VERSION(_major, _minor) \ ((_major) << VMCI_VERSION_SHIFT_WIDTH | (u16) (_minor)) #define VMCI_VERSION_MAJOR(v) ((u32) (v) >> VMCI_VERSION_SHIFT_WIDTH) #define VMCI_VERSION_MINOR(v) ((u16) (v)) /* * VMCI_VERSION is always the current version. Subsequently listed * versions are ways of detecting previous versions of the connecting * application (i.e., VMX). * * VMCI_VERSION_NOVMVM: This version removed support for VM to VM * communication. * * VMCI_VERSION_NOTIFY: This version introduced doorbell notification * support. * * VMCI_VERSION_HOSTQP: This version introduced host end point support * for hosted products. * * VMCI_VERSION_PREHOSTQP: This is the version prior to the adoption of * support for host end-points. * * VMCI_VERSION_PREVERS2: This fictional version number is intended to * represent the version of a VMX which doesn't call into the driver * with ioctl VERSION2 and thus doesn't establish its version with the * driver. */ #define VMCI_VERSION VMCI_VERSION_NOVMVM #define VMCI_VERSION_NOVMVM VMCI_MAKE_VERSION(11, 0) #define VMCI_VERSION_NOTIFY VMCI_MAKE_VERSION(10, 0) #define VMCI_VERSION_HOSTQP VMCI_MAKE_VERSION(9, 0) #define VMCI_VERSION_PREHOSTQP VMCI_MAKE_VERSION(8, 0) #define VMCI_VERSION_PREVERS2 VMCI_MAKE_VERSION(1, 0) #define VMCI_SOCKETS_MAKE_VERSION(_p) \ ((((_p)[0] & 0xFF) << 24) | (((_p)[1] & 0xFF) << 16) | ((_p)[2])) /* * The VMCI IOCTLs. We use identity code 7, as noted in ioctl-number.h, and * we start at sequence 9f. This gives us the same values that our shipping * products use, starting at 1951, provided we leave out the direction and * structure size. Note that VMMon occupies the block following us, starting * at 2001. */ #define IOCTL_VMCI_VERSION _IO(7, 0x9f) /* 1951 */ #define IOCTL_VMCI_INIT_CONTEXT _IO(7, 0xa0) #define IOCTL_VMCI_QUEUEPAIR_SETVA _IO(7, 0xa4) #define IOCTL_VMCI_NOTIFY_RESOURCE _IO(7, 0xa5) #define IOCTL_VMCI_NOTIFICATIONS_RECEIVE _IO(7, 0xa6) #define IOCTL_VMCI_VERSION2 _IO(7, 0xa7) #define IOCTL_VMCI_QUEUEPAIR_ALLOC _IO(7, 0xa8) #define IOCTL_VMCI_QUEUEPAIR_SETPAGEFILE _IO(7, 0xa9) #define IOCTL_VMCI_QUEUEPAIR_DETACH _IO(7, 0xaa) #define IOCTL_VMCI_DATAGRAM_SEND _IO(7, 0xab) #define IOCTL_VMCI_DATAGRAM_RECEIVE _IO(7, 0xac) #define IOCTL_VMCI_CTX_ADD_NOTIFICATION _IO(7, 0xaf) #define IOCTL_VMCI_CTX_REMOVE_NOTIFICATION _IO(7, 0xb0) #define IOCTL_VMCI_CTX_GET_CPT_STATE _IO(7, 0xb1) #define IOCTL_VMCI_CTX_SET_CPT_STATE _IO(7, 0xb2) #define IOCTL_VMCI_GET_CONTEXT_ID _IO(7, 0xb3) #define IOCTL_VMCI_SOCKETS_VERSION _IO(7, 0xb4) #define IOCTL_VMCI_SOCKETS_GET_AF_VALUE _IO(7, 0xb8) #define IOCTL_VMCI_SOCKETS_GET_LOCAL_CID _IO(7, 0xb9) #define IOCTL_VMCI_SET_NOTIFY _IO(7, 0xcb) /* 1995 */ /*IOCTL_VMMON_START _IO(7, 0xd1)*/ /* 2001 */ /* * struct vmci_queue_header - VMCI Queue Header information. * * A Queue cannot stand by itself as designed. Each Queue's header * contains a pointer into itself (the producer_tail) and into its peer * (consumer_head). The reason for the separation is one of * accessibility: Each end-point can modify two things: where the next * location to enqueue is within its produce_q (producer_tail); and * where the next dequeue location is in its consume_q (consumer_head). * * An end-point cannot modify the pointers of its peer (guest to * guest; NOTE that in the host both queue headers are mapped r/w). * But, each end-point needs read access to both Queue header * structures in order to determine how much space is used (or left) * in the Queue. This is because for an end-point to know how full * its produce_q is, it needs to use the consumer_head that points into * the produce_q but -that- consumer_head is in the Queue header for * that end-points consume_q. * * Thoroughly confused? Sorry. * * producer_tail: the point to enqueue new entrants. When you approach * a line in a store, for example, you walk up to the tail. * * consumer_head: the point in the queue from which the next element is * dequeued. In other words, who is next in line is he who is at the * head of the line. * * Also, producer_tail points to an empty byte in the Queue, whereas * consumer_head points to a valid byte of data (unless producer_tail == * consumer_head in which case consumer_head does not point to a valid * byte of data). * * For a queue of buffer 'size' bytes, the tail and head pointers will be in * the range [0, size-1]. * * If produce_q_header->producer_tail == consume_q_header->consumer_head * then the produce_q is empty. */ struct vmci_queue_header { /* All fields are 64bit and aligned. */ struct vmci_handle handle; /* Identifier. */ u64 producer_tail; /* Offset in this queue. */ u64 consumer_head; /* Offset in peer queue. */ }; /* * struct vmci_datagram - Base struct for vmci datagrams. * @dst: A vmci_handle that tracks the destination of the datagram. * @src: A vmci_handle that tracks the source of the datagram. * @payload_size: The size of the payload. * * vmci_datagram structs are used when sending vmci datagrams. They include * the necessary source and destination information to properly route * the information along with the size of the package. */ struct vmci_datagram { struct vmci_handle dst; struct vmci_handle src; u64 payload_size; }; /* * Second flag is for creating a well-known handle instead of a per context * handle. Next flag is for deferring datagram delivery, so that the * datagram callback is invoked in a delayed context (not interrupt context). */ #define VMCI_FLAG_DG_NONE 0 #define VMCI_FLAG_WELLKNOWN_DG_HND BIT(0) #define VMCI_FLAG_ANYCID_DG_HND BIT(1) #define VMCI_FLAG_DG_DELAYED_CB BIT(2) /* * Maximum supported size of a VMCI datagram for routable datagrams. * Datagrams going to the hypervisor are allowed to be larger. */ #define VMCI_MAX_DG_SIZE (17 * 4096) #define VMCI_MAX_DG_PAYLOAD_SIZE (VMCI_MAX_DG_SIZE - \ sizeof(struct vmci_datagram)) #define VMCI_DG_PAYLOAD(_dg) (void *)((char *)(_dg) + \ sizeof(struct vmci_datagram)) #define VMCI_DG_HEADERSIZE sizeof(struct vmci_datagram) #define VMCI_DG_SIZE(_dg) (VMCI_DG_HEADERSIZE + (size_t)(_dg)->payload_size) #define VMCI_DG_SIZE_ALIGNED(_dg) ((VMCI_DG_SIZE(_dg) + 7) & (~((size_t) 0x7))) #define VMCI_MAX_DATAGRAM_QUEUE_SIZE (VMCI_MAX_DG_SIZE * 2) struct vmci_event_payload_qp { struct vmci_handle handle; /* queue_pair handle. */ u32 peer_id; /* Context id of attaching/detaching VM. */ u32 _pad; }; /* Flags for VMCI queue_pair API. */ enum { /* Fail alloc if QP not created by peer. */ VMCI_QPFLAG_ATTACH_ONLY = 1 << 0, /* Only allow attaches from local context. */ VMCI_QPFLAG_LOCAL = 1 << 1, /* Host won't block when guest is quiesced. */ VMCI_QPFLAG_NONBLOCK = 1 << 2, /* Pin data pages in ESX. Used with NONBLOCK */ VMCI_QPFLAG_PINNED = 1 << 3, /* Update the following flag when adding new flags. */ VMCI_QP_ALL_FLAGS = (VMCI_QPFLAG_ATTACH_ONLY | VMCI_QPFLAG_LOCAL | VMCI_QPFLAG_NONBLOCK | VMCI_QPFLAG_PINNED), /* Convenience flags */ VMCI_QP_ASYMM = (VMCI_QPFLAG_NONBLOCK | VMCI_QPFLAG_PINNED), VMCI_QP_ASYMM_PEER = (VMCI_QPFLAG_ATTACH_ONLY | VMCI_QP_ASYMM), }; /* * We allow at least 1024 more event datagrams from the hypervisor past the * normally allowed datagrams pending for a given context. We define this * limit on event datagrams from the hypervisor to guard against DoS attack * from a malicious VM which could repeatedly attach to and detach from a queue * pair, causing events to be queued at the destination VM. However, the rate * at which such events can be generated is small since it requires a VM exit * and handling of queue pair attach/detach call at the hypervisor. Event * datagrams may be queued up at the destination VM if it has interrupts * disabled or if it is not draining events for some other reason. 1024 * datagrams is a grossly conservative estimate of the time for which * interrupts may be disabled in the destination VM, but at the same time does * not exacerbate the memory pressure problem on the host by much (size of each * event datagram is small). */ #define VMCI_MAX_DATAGRAM_AND_EVENT_QUEUE_SIZE \ (VMCI_MAX_DATAGRAM_QUEUE_SIZE + \ 1024 * (sizeof(struct vmci_datagram) + \ sizeof(struct vmci_event_data_max))) /* * Struct used for querying, via VMCI_RESOURCES_QUERY, the availability of * hypervisor resources. Struct size is 16 bytes. All fields in struct are * aligned to their natural alignment. */ struct vmci_resource_query_hdr { struct vmci_datagram hdr; u32 num_resources; u32 _padding; }; /* * Convenience struct for negotiating vectors. Must match layout of * VMCIResourceQueryHdr minus the struct vmci_datagram header. */ struct vmci_resource_query_msg { u32 num_resources; u32 _padding; u32 resources[1]; }; /* * The maximum number of resources that can be queried using * VMCI_RESOURCE_QUERY is 31, as the result is encoded in the lower 31 * bits of a positive return value. Negative values are reserved for * errors. */ #define VMCI_RESOURCE_QUERY_MAX_NUM 31 /* Maximum size for the VMCI_RESOURCE_QUERY request. */ #define VMCI_RESOURCE_QUERY_MAX_SIZE \ (sizeof(struct vmci_resource_query_hdr) + \ sizeof(u32) * VMCI_RESOURCE_QUERY_MAX_NUM) /* * Struct used for setting the notification bitmap. All fields in * struct are aligned to their natural alignment. */ struct vmci_notify_bm_set_msg { struct vmci_datagram hdr; union { u32 bitmap_ppn32; u64 bitmap_ppn64; }; }; /* * Struct used for linking a doorbell handle with an index in the * notify bitmap. All fields in struct are aligned to their natural * alignment. */ struct vmci_doorbell_link_msg { struct vmci_datagram hdr; struct vmci_handle handle; u64 notify_idx; }; /* * Struct used for unlinking a doorbell handle from an index in the * notify bitmap. All fields in struct are aligned to their natural * alignment. */ struct vmci_doorbell_unlink_msg { struct vmci_datagram hdr; struct vmci_handle handle; }; /* * Struct used for generating a notification on a doorbell handle. All * fields in struct are aligned to their natural alignment. */ struct vmci_doorbell_notify_msg { struct vmci_datagram hdr; struct vmci_handle handle; }; /* * This struct is used to contain data for events. Size of this struct is a * multiple of 8 bytes, and all fields are aligned to their natural alignment. */ struct vmci_event_data { u32 event; /* 4 bytes. */ u32 _pad; /* Event payload is put here. */ }; /* * Define the different VMCI_EVENT payload data types here. All structs must * be a multiple of 8 bytes, and fields must be aligned to their natural * alignment. */ struct vmci_event_payld_ctx { u32 context_id; /* 4 bytes. */ u32 _pad; }; struct vmci_event_payld_qp { struct vmci_handle handle; /* queue_pair handle. */ u32 peer_id; /* Context id of attaching/detaching VM. */ u32 _pad; }; /* * We define the following struct to get the size of the maximum event * data the hypervisor may send to the guest. If adding a new event * payload type above, add it to the following struct too (inside the * union). */ struct vmci_event_data_max { struct vmci_event_data event_data; union { struct vmci_event_payld_ctx context_payload; struct vmci_event_payld_qp qp_payload; } ev_data_payload; }; /* * Struct used for VMCI_EVENT_SUBSCRIBE/UNSUBSCRIBE and * VMCI_EVENT_HANDLER messages. Struct size is 32 bytes. All fields * in struct are aligned to their natural alignment. */ struct vmci_event_msg { struct vmci_datagram hdr; /* Has event type and payload. */ struct vmci_event_data event_data; /* Payload gets put here. */ }; /* Event with context payload. */ struct vmci_event_ctx { struct vmci_event_msg msg; struct vmci_event_payld_ctx payload; }; /* Event with QP payload. */ struct vmci_event_qp { struct vmci_event_msg msg; struct vmci_event_payld_qp payload; }; /* * Structs used for queue_pair alloc and detach messages. We align fields of * these structs to 64bit boundaries. */ struct vmci_qp_alloc_msg { struct vmci_datagram hdr; struct vmci_handle handle; u32 peer; u32 flags; u64 produce_size; u64 consume_size; u64 num_ppns; /* List of PPNs placed here. */ }; struct vmci_qp_detach_msg { struct vmci_datagram hdr; struct vmci_handle handle; }; /* VMCI Doorbell API. */ #define VMCI_FLAG_DELAYED_CB BIT(0) typedef void (*vmci_callback) (void *client_data); /* * struct vmci_qp - A vmw_vmci queue pair handle. * * This structure is used as a handle to a queue pair created by * VMCI. It is intentionally left opaque to clients. */ struct vmci_qp; /* Callback needed for correctly waiting on events. */ typedef int (*vmci_datagram_recv_cb) (void *client_data, struct vmci_datagram *msg); /* VMCI Event API. */ typedef void (*vmci_event_cb) (u32 sub_id, const struct vmci_event_data *ed, void *client_data); /* * We use the following inline function to access the payload data * associated with an event data. */ static inline const void * vmci_event_data_const_payload(const struct vmci_event_data *ev_data) { return (const char *)ev_data + sizeof(*ev_data); } static inline void *vmci_event_data_payload(struct vmci_event_data *ev_data) { return (void *)vmci_event_data_const_payload(ev_data); } /* * Helper to read a value from a head or tail pointer. For X86_32, the * pointer is treated as a 32bit value, since the pointer value * never exceeds a 32bit value in this case. Also, doing an * atomic64_read on X86_32 uniprocessor systems may be implemented * as a non locked cmpxchg8b, that may end up overwriting updates done * by the VMCI device to the memory location. On 32bit SMP, the lock * prefix will be used, so correctness isn't an issue, but using a * 64bit operation still adds unnecessary overhead. */ static inline u64 vmci_q_read_pointer(u64 *var) { return READ_ONCE(*(unsigned long *)var); } /* * Helper to set the value of a head or tail pointer. For X86_32, the * pointer is treated as a 32bit value, since the pointer value * never exceeds a 32bit value in this case. On 32bit SMP, using a * locked cmpxchg8b adds unnecessary overhead. */ static inline void vmci_q_set_pointer(u64 *var, u64 new_val) { /* XXX buggered on big-endian */ WRITE_ONCE(*(unsigned long *)var, (unsigned long)new_val); } /* * Helper to add a given offset to a head or tail pointer. Wraps the * value of the pointer around the max size of the queue. */ static inline void vmci_qp_add_pointer(u64 *var, size_t add, u64 size) { u64 new_val = vmci_q_read_pointer(var); if (new_val >= size - add) new_val -= size; new_val += add; vmci_q_set_pointer(var, new_val); } /* * Helper routine to get the Producer Tail from the supplied queue. */ static inline u64 vmci_q_header_producer_tail(const struct vmci_queue_header *q_header) { struct vmci_queue_header *qh = (struct vmci_queue_header *)q_header; return vmci_q_read_pointer(&qh->producer_tail); } /* * Helper routine to get the Consumer Head from the supplied queue. */ static inline u64 vmci_q_header_consumer_head(const struct vmci_queue_header *q_header) { struct vmci_queue_header *qh = (struct vmci_queue_header *)q_header; return vmci_q_read_pointer(&qh->consumer_head); } /* * Helper routine to increment the Producer Tail. Fundamentally, * vmci_qp_add_pointer() is used to manipulate the tail itself. */ static inline void vmci_q_header_add_producer_tail(struct vmci_queue_header *q_header, size_t add, u64 queue_size) { vmci_qp_add_pointer(&q_header->producer_tail, add, queue_size); } /* * Helper routine to increment the Consumer Head. Fundamentally, * vmci_qp_add_pointer() is used to manipulate the head itself. */ static inline void vmci_q_header_add_consumer_head(struct vmci_queue_header *q_header, size_t add, u64 queue_size) { vmci_qp_add_pointer(&q_header->consumer_head, add, queue_size); } /* * Helper routine for getting the head and the tail pointer for a queue. * Both the VMCIQueues are needed to get both the pointers for one queue. */ static inline void vmci_q_header_get_pointers(const struct vmci_queue_header *produce_q_header, const struct vmci_queue_header *consume_q_header, u64 *producer_tail, u64 *consumer_head) { if (producer_tail) *producer_tail = vmci_q_header_producer_tail(produce_q_header); if (consumer_head) *consumer_head = vmci_q_header_consumer_head(consume_q_header); } static inline void vmci_q_header_init(struct vmci_queue_header *q_header, const struct vmci_handle handle) { q_header->handle = handle; q_header->producer_tail = 0; q_header->consumer_head = 0; } /* * Finds available free space in a produce queue to enqueue more * data or reports an error if queue pair corruption is detected. */ static s64 vmci_q_header_free_space(const struct vmci_queue_header *produce_q_header, const struct vmci_queue_header *consume_q_header, const u64 produce_q_size) { u64 tail; u64 head; u64 free_space; tail = vmci_q_header_producer_tail(produce_q_header); head = vmci_q_header_consumer_head(consume_q_header); if (tail >= produce_q_size || head >= produce_q_size) return VMCI_ERROR_INVALID_SIZE; /* * Deduct 1 to avoid tail becoming equal to head which causes * ambiguity. If head and tail are equal it means that the * queue is empty. */ if (tail >= head) free_space = produce_q_size - (tail - head) - 1; else free_space = head - tail - 1; return free_space; } /* * vmci_q_header_free_space() does all the heavy lifting of * determing the number of free bytes in a Queue. This routine, * then subtracts that size from the full size of the Queue so * the caller knows how many bytes are ready to be dequeued. * Results: * On success, available data size in bytes (up to MAX_INT64). * On failure, appropriate error code. */ static inline s64 vmci_q_header_buf_ready(const struct vmci_queue_header *consume_q_header, const struct vmci_queue_header *produce_q_header, const u64 consume_q_size) { s64 free_space; free_space = vmci_q_header_free_space(consume_q_header, produce_q_header, consume_q_size); if (free_space < VMCI_SUCCESS) return free_space; return consume_q_size - free_space - 1; } #endif /* _VMW_VMCI_DEF_H_ */
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