1/****************************************************************************** 2 * event_channel.h 3 * 4 * Event channels between domains. 5 * 6 * Copyright (c) 2003-2004, K A Fraser. 7 */ 8 9#ifndef __XEN_PUBLIC_EVENT_CHANNEL_H__ 10#define __XEN_PUBLIC_EVENT_CHANNEL_H__ 11 12#include <xen/interface/xen.h> 13 14typedef uint32_t evtchn_port_t; 15DEFINE_GUEST_HANDLE(evtchn_port_t); 16 17/* 18 * EVTCHNOP_alloc_unbound: Allocate a port in domain <dom> and mark as 19 * accepting interdomain bindings from domain <remote_dom>. A fresh port 20 * is allocated in <dom> and returned as <port>. 21 * NOTES: 22 * 1. If the caller is unprivileged then <dom> must be DOMID_SELF. 23 * 2. <rdom> may be DOMID_SELF, allowing loopback connections. 24 */ 25#define EVTCHNOP_alloc_unbound 6 26struct evtchn_alloc_unbound { 27 /* IN parameters */ 28 domid_t dom, remote_dom; 29 /* OUT parameters */ 30 evtchn_port_t port; 31}; 32 33/* 34 * EVTCHNOP_bind_interdomain: Construct an interdomain event channel between 35 * the calling domain and <remote_dom>. <remote_dom,remote_port> must identify 36 * a port that is unbound and marked as accepting bindings from the calling 37 * domain. A fresh port is allocated in the calling domain and returned as 38 * <local_port>. 39 * NOTES: 40 * 2. <remote_dom> may be DOMID_SELF, allowing loopback connections. 41 */ 42#define EVTCHNOP_bind_interdomain 0 43struct evtchn_bind_interdomain { 44 /* IN parameters. */ 45 domid_t remote_dom; 46 evtchn_port_t remote_port; 47 /* OUT parameters. */ 48 evtchn_port_t local_port; 49}; 50 51/* 52 * EVTCHNOP_bind_virq: Bind a local event channel to VIRQ <irq> on specified 53 * vcpu. 54 * NOTES: 55 * 1. A virtual IRQ may be bound to at most one event channel per vcpu. 56 * 2. The allocated event channel is bound to the specified vcpu. The binding 57 * may not be changed. 58 */ 59#define EVTCHNOP_bind_virq 1 60struct evtchn_bind_virq { 61 /* IN parameters. */ 62 uint32_t virq; 63 uint32_t vcpu; 64 /* OUT parameters. */ 65 evtchn_port_t port; 66}; 67 68/* 69 * EVTCHNOP_bind_pirq: Bind a local event channel to PIRQ <irq>. 70 * NOTES: 71 * 1. A physical IRQ may be bound to at most one event channel per domain. 72 * 2. Only a sufficiently-privileged domain may bind to a physical IRQ. 73 */ 74#define EVTCHNOP_bind_pirq 2 75struct evtchn_bind_pirq { 76 /* IN parameters. */ 77 uint32_t pirq; 78#define BIND_PIRQ__WILL_SHARE 1 79 uint32_t flags; /* BIND_PIRQ__* */ 80 /* OUT parameters. */ 81 evtchn_port_t port; 82}; 83 84/* 85 * EVTCHNOP_bind_ipi: Bind a local event channel to receive events. 86 * NOTES: 87 * 1. The allocated event channel is bound to the specified vcpu. The binding 88 * may not be changed. 89 */ 90#define EVTCHNOP_bind_ipi 7 91struct evtchn_bind_ipi { 92 uint32_t vcpu; 93 /* OUT parameters. */ 94 evtchn_port_t port; 95}; 96 97/* 98 * EVTCHNOP_close: Close a local event channel <port>. If the channel is 99 * interdomain then the remote end is placed in the unbound state 100 * (EVTCHNSTAT_unbound), awaiting a new connection. 101 */ 102#define EVTCHNOP_close 3 103struct evtchn_close { 104 /* IN parameters. */ 105 evtchn_port_t port; 106}; 107 108/* 109 * EVTCHNOP_send: Send an event to the remote end of the channel whose local 110 * endpoint is <port>. 111 */ 112#define EVTCHNOP_send 4 113struct evtchn_send { 114 /* IN parameters. */ 115 evtchn_port_t port; 116}; 117 118/* 119 * EVTCHNOP_status: Get the current status of the communication channel which 120 * has an endpoint at <dom, port>. 121 * NOTES: 122 * 1. <dom> may be specified as DOMID_SELF. 123 * 2. Only a sufficiently-privileged domain may obtain the status of an event 124 * channel for which <dom> is not DOMID_SELF. 125 */ 126#define EVTCHNOP_status 5 127struct evtchn_status { 128 /* IN parameters */ 129 domid_t dom; 130 evtchn_port_t port; 131 /* OUT parameters */ 132#define EVTCHNSTAT_closed 0 /* Channel is not in use. */ 133#define EVTCHNSTAT_unbound 1 /* Channel is waiting interdom connection.*/ 134#define EVTCHNSTAT_interdomain 2 /* Channel is connected to remote domain. */ 135#define EVTCHNSTAT_pirq 3 /* Channel is bound to a phys IRQ line. */ 136#define EVTCHNSTAT_virq 4 /* Channel is bound to a virtual IRQ line */ 137#define EVTCHNSTAT_ipi 5 /* Channel is bound to a virtual IPI line */ 138 uint32_t status; 139 uint32_t vcpu; /* VCPU to which this channel is bound. */ 140 union { 141 struct { 142 domid_t dom; 143 } unbound; /* EVTCHNSTAT_unbound */ 144 struct { 145 domid_t dom; 146 evtchn_port_t port; 147 } interdomain; /* EVTCHNSTAT_interdomain */ 148 uint32_t pirq; /* EVTCHNSTAT_pirq */ 149 uint32_t virq; /* EVTCHNSTAT_virq */ 150 } u; 151}; 152 153/* 154 * EVTCHNOP_bind_vcpu: Specify which vcpu a channel should notify when an 155 * event is pending. 156 * NOTES: 157 * 1. IPI- and VIRQ-bound channels always notify the vcpu that initialised 158 * the binding. This binding cannot be changed. 159 * 2. All other channels notify vcpu0 by default. This default is set when 160 * the channel is allocated (a port that is freed and subsequently reused 161 * has its binding reset to vcpu0). 162 */ 163#define EVTCHNOP_bind_vcpu 8 164struct evtchn_bind_vcpu { 165 /* IN parameters. */ 166 evtchn_port_t port; 167 uint32_t vcpu; 168}; 169 170/* 171 * EVTCHNOP_unmask: Unmask the specified local event-channel port and deliver 172 * a notification to the appropriate VCPU if an event is pending. 173 */ 174#define EVTCHNOP_unmask 9 175struct evtchn_unmask { 176 /* IN parameters. */ 177 evtchn_port_t port; 178}; 179 180struct evtchn_op { 181 uint32_t cmd; /* EVTCHNOP_* */ 182 union { 183 struct evtchn_alloc_unbound alloc_unbound; 184 struct evtchn_bind_interdomain bind_interdomain; 185 struct evtchn_bind_virq bind_virq; 186 struct evtchn_bind_pirq bind_pirq; 187 struct evtchn_bind_ipi bind_ipi; 188 struct evtchn_close close; 189 struct evtchn_send send; 190 struct evtchn_status status; 191 struct evtchn_bind_vcpu bind_vcpu; 192 struct evtchn_unmask unmask; 193 } u; 194}; 195DEFINE_GUEST_HANDLE_STRUCT(evtchn_op); 196 197#endif /* __XEN_PUBLIC_EVENT_CHANNEL_H__ */ 198