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kernel/include/linux/vmw_vmci_defs.h

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/* 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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