1 /* SPDX-License-Identifier: (GPL-2.0 OR CDDL-1.0) */ 2 /* Copyright (C) 2010-2016 Oracle Corporation */ 3 4 #ifndef __VBOXGUEST_CORE_H__ 5 #define __VBOXGUEST_CORE_H__ 6 7 #include <linux/input.h> 8 #include <linux/interrupt.h> 9 #include <linux/kernel.h> 10 #include <linux/list.h> 11 #include <linux/miscdevice.h> 12 #include <linux/spinlock.h> 13 #include <linux/wait.h> 14 #include <linux/workqueue.h> 15 #include <linux/vboxguest.h> 16 #include "vmmdev.h" 17 18 /* 19 * The mainline kernel version (this version) of the vboxguest module 20 * contained a bug where it defined VBGL_IOCTL_VMMDEV_REQUEST_BIG and 21 * VBGL_IOCTL_LOG using _IOC(_IOC_READ | _IOC_WRITE, 'V', ...) instead 22 * of _IO(V, ...) as the out of tree VirtualBox upstream version does. 23 * 24 * These _ALT definitions keep compatibility with the wrong defines the 25 * mainline kernel version used for a while. 26 * Note the VirtualBox userspace bits have always been built against 27 * VirtualBox upstream's headers, so this is likely not necessary. But 28 * we must never break our ABI so we keep these around to be 100% sure. 29 */ 30 #define VBG_IOCTL_VMMDEV_REQUEST_BIG_ALT _IOC(_IOC_READ | _IOC_WRITE, 'V', 3, 0) 31 #define VBG_IOCTL_LOG_ALT(s) _IOC(_IOC_READ | _IOC_WRITE, 'V', 9, s) 32 33 struct vbg_session; 34 35 /** VBox guest memory balloon. */ 36 struct vbg_mem_balloon { 37 /** Work handling VMMDEV_EVENT_BALLOON_CHANGE_REQUEST events */ 38 struct work_struct work; 39 /** Pre-allocated vmmdev_memballoon_info req for query */ 40 struct vmmdev_memballoon_info *get_req; 41 /** Pre-allocated vmmdev_memballoon_change req for inflate / deflate */ 42 struct vmmdev_memballoon_change *change_req; 43 /** The current number of chunks in the balloon. */ 44 u32 chunks; 45 /** The maximum number of chunks in the balloon. */ 46 u32 max_chunks; 47 /** 48 * Array of pointers to page arrays. A page * array is allocated for 49 * each chunk when inflating, and freed when the deflating. 50 */ 51 struct page ***pages; 52 }; 53 54 /** 55 * Per bit usage tracker for a u32 mask. 56 * 57 * Used for optimal handling of guest properties and event filter. 58 */ 59 struct vbg_bit_usage_tracker { 60 /** Per bit usage counters. */ 61 u32 per_bit_usage[32]; 62 /** The current mask according to per_bit_usage. */ 63 u32 mask; 64 }; 65 66 /** VBox guest device (data) extension. */ 67 struct vbg_dev { 68 struct device *dev; 69 /** The base of the adapter I/O ports. */ 70 u16 io_port; 71 /** Pointer to the mapping of the VMMDev adapter memory. */ 72 struct vmmdev_memory *mmio; 73 /** Host version */ 74 char host_version[64]; 75 /** Host features */ 76 unsigned int host_features; 77 /** 78 * Dummy page and vmap address for reserved kernel virtual-address 79 * space for the guest mappings, only used on hosts lacking vtx. 80 */ 81 struct page *guest_mappings_dummy_page; 82 void *guest_mappings; 83 /** Spinlock protecting pending_events. */ 84 spinlock_t event_spinlock; 85 /** Preallocated struct vmmdev_events for the IRQ handler. */ 86 struct vmmdev_events *ack_events_req; 87 /** Wait-for-event list for threads waiting for multiple events. */ 88 wait_queue_head_t event_wq; 89 /** Mask of pending events. */ 90 u32 pending_events; 91 /** Wait-for-event list for threads waiting on HGCM async completion. */ 92 wait_queue_head_t hgcm_wq; 93 /** Pre-allocated hgcm cancel2 req. for cancellation on timeout */ 94 struct vmmdev_hgcm_cancel2 *cancel_req; 95 /** Mutex protecting cancel_req accesses */ 96 struct mutex cancel_req_mutex; 97 /** Pre-allocated mouse-status request for the input-device handling. */ 98 struct vmmdev_mouse_status *mouse_status_req; 99 /** Input device for reporting abs mouse coordinates to the guest. */ 100 struct input_dev *input; 101 102 /** Memory balloon information. */ 103 struct vbg_mem_balloon mem_balloon; 104 105 /** Lock for session related items in vbg_dev and vbg_session */ 106 struct mutex session_mutex; 107 /** Events we won't permit anyone to filter out. */ 108 u32 fixed_events; 109 /** 110 * Usage counters for the host events (excludes fixed events), 111 * Protected by session_mutex. 112 */ 113 struct vbg_bit_usage_tracker event_filter_tracker; 114 /** 115 * The event filter last reported to the host (or UINT32_MAX). 116 * Protected by session_mutex. 117 */ 118 u32 event_filter_host; 119 120 /** 121 * Usage counters for guest capabilities. Indexed by capability bit 122 * number, one count per session using a capability. 123 * Protected by session_mutex. 124 */ 125 struct vbg_bit_usage_tracker guest_caps_tracker; 126 /** 127 * The guest capabilities last reported to the host (or UINT32_MAX). 128 * Protected by session_mutex. 129 */ 130 u32 guest_caps_host; 131 132 /** 133 * Heartbeat timer which fires with interval 134 * cNsHearbeatInterval and its handler sends 135 * VMMDEVREQ_GUEST_HEARTBEAT to VMMDev. 136 */ 137 struct timer_list heartbeat_timer; 138 /** Heartbeat timer interval in ms. */ 139 int heartbeat_interval_ms; 140 /** Preallocated VMMDEVREQ_GUEST_HEARTBEAT request. */ 141 struct vmmdev_request_header *guest_heartbeat_req; 142 143 /** "vboxguest" char-device */ 144 struct miscdevice misc_device; 145 /** "vboxuser" char-device */ 146 struct miscdevice misc_device_user; 147 }; 148 149 /** The VBoxGuest per session data. */ 150 struct vbg_session { 151 /** Pointer to the device extension. */ 152 struct vbg_dev *gdev; 153 154 /** 155 * Array containing HGCM client IDs associated with this session. 156 * These will be automatically disconnected when the session is closed. 157 * Protected by vbg_gdev.session_mutex. 158 */ 159 u32 hgcm_client_ids[64]; 160 /** 161 * Host events requested by the session. 162 * An event type requested in any guest session will be added to the 163 * host filter. Protected by vbg_gdev.session_mutex. 164 */ 165 u32 event_filter; 166 /** 167 * Guest capabilities for this session. 168 * A capability claimed by any guest session will be reported to the 169 * host. Protected by vbg_gdev.session_mutex. 170 */ 171 u32 guest_caps; 172 /** Does this session belong to a root process or a user one? */ 173 bool user_session; 174 /** Set on CANCEL_ALL_WAITEVENTS, protected by vbg_devevent_spinlock. */ 175 bool cancel_waiters; 176 }; 177 178 int vbg_core_init(struct vbg_dev *gdev, u32 fixed_events); 179 void vbg_core_exit(struct vbg_dev *gdev); 180 struct vbg_session *vbg_core_open_session(struct vbg_dev *gdev, bool user); 181 void vbg_core_close_session(struct vbg_session *session); 182 int vbg_core_ioctl(struct vbg_session *session, unsigned int req, void *data); 183 int vbg_core_set_mouse_status(struct vbg_dev *gdev, u32 features); 184 185 irqreturn_t vbg_core_isr(int irq, void *dev_id); 186 187 void vbg_linux_mouse_event(struct vbg_dev *gdev); 188 189 /* Private (non exported) functions form vboxguest_utils.c */ 190 void *vbg_req_alloc(size_t len, enum vmmdev_request_type req_type); 191 void vbg_req_free(void *req, size_t len); 192 int vbg_req_perform(struct vbg_dev *gdev, void *req); 193 int vbg_hgcm_call32( 194 struct vbg_dev *gdev, u32 client_id, u32 function, u32 timeout_ms, 195 struct vmmdev_hgcm_function_parameter32 *parm32, u32 parm_count, 196 int *vbox_status); 197 198 #endif 199