vmm_ioport.c revision 266641
1/*- 2 * Copyright (c) 2014 Tycho Nightingale <tycho.nightingale@pluribusnetworks.com> 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 */ 26 27#include <sys/cdefs.h> 28__FBSDID("$FreeBSD: head/sys/amd64/vmm/vmm_ioport.c 266641 2014-05-25 00:57:24Z neel $"); 29 30#include <sys/param.h> 31#include <sys/types.h> 32#include <sys/queue.h> 33#include <sys/cpuset.h> 34#include <sys/systm.h> 35 36#include <vm/vm.h> 37 38#include <machine/vmm.h> 39#include <machine/vmm_instruction_emul.h> 40#include <x86/psl.h> 41 42#include "vatpic.h" 43#include "vatpit.h" 44#include "vmm_ioport.h" 45#include "vmm_ktr.h" 46 47#define MAX_IOPORTS 1280 48 49ioport_handler_func_t ioport_handler[MAX_IOPORTS] = { 50 [TIMER_MODE] = vatpit_handler, 51 [TIMER_CNTR0] = vatpit_handler, 52 [TIMER_CNTR1] = vatpit_handler, 53 [TIMER_CNTR2] = vatpit_handler, 54 [NMISC_PORT] = vatpit_nmisc_handler, 55 [IO_ICU1] = vatpic_master_handler, 56 [IO_ICU1 + ICU_IMR_OFFSET] = vatpic_master_handler, 57 [IO_ICU2] = vatpic_slave_handler, 58 [IO_ICU2 + ICU_IMR_OFFSET] = vatpic_slave_handler, 59 [IO_ELCR1] = vatpic_elc_handler, 60 [IO_ELCR2] = vatpic_elc_handler, 61}; 62 63#ifdef KTR 64static const char * 65inout_instruction(struct vm_exit *vmexit) 66{ 67 int index; 68 69 static const char *iodesc[] = { 70 "outb", "outw", "outl", 71 "inb", "inw", "inl", 72 "outsb", "outsw", "outsd" 73 "insb", "insw", "insd", 74 }; 75 76 switch (vmexit->u.inout.bytes) { 77 case 1: 78 index = 0; 79 break; 80 case 2: 81 index = 1; 82 break; 83 default: 84 index = 2; 85 break; 86 } 87 88 if (vmexit->u.inout.in) 89 index += 3; 90 91 if (vmexit->u.inout.string) 92 index += 6; 93 94 KASSERT(index < nitems(iodesc), ("%s: invalid index %d", 95 __func__, index)); 96 97 return (iodesc[index]); 98} 99#endif /* KTR */ 100 101static int 102emulate_inout_port(struct vm *vm, int vcpuid, struct vm_exit *vmexit, 103 bool *retu) 104{ 105 ioport_handler_func_t handler; 106 uint32_t mask, val; 107 int error; 108 109 error = 0; 110 *retu = true; 111 112 if (vmexit->u.inout.port >= MAX_IOPORTS) 113 goto done; 114 115 handler = ioport_handler[vmexit->u.inout.port]; 116 if (handler == NULL) 117 goto done; 118 119 mask = vie_size2mask(vmexit->u.inout.bytes); 120 121 if (!vmexit->u.inout.in) { 122 val = vmexit->u.inout.eax & mask; 123 } 124 125 error = (*handler)(vm, vcpuid, vmexit->u.inout.in, 126 vmexit->u.inout.port, vmexit->u.inout.bytes, &val); 127 128 if (!error) { 129 *retu = false; 130 if (vmexit->u.inout.in) { 131 vmexit->u.inout.eax &= ~mask; 132 vmexit->u.inout.eax |= val & mask; 133 error = vm_set_register(vm, vcpuid, 134 VM_REG_GUEST_RAX, vmexit->u.inout.eax); 135 KASSERT(error == 0, ("emulate_ioport: error %d " 136 "setting guest rax register", error)); 137 } 138 } 139done: 140 return (error); 141} 142 143static int 144emulate_inout_str(struct vm *vm, int vcpuid, struct vm_exit *vmexit, bool *retu) 145{ 146 struct vm_inout_str *vis; 147 int in; 148 149 vis = &vmexit->u.inout_str; 150 in = vis->inout.in; 151 152 /* 153 * ins/outs VM exit takes precedence over the following error 154 * conditions that would ordinarily be checked by the processor: 155 * 156 * - #GP(0) due to segment being unusable. 157 * - #GP(0) due to memory operand effective address outside the limit 158 * of the segment. 159 * - #AC(0) if alignment checking is enabled and an unaligned memory 160 * reference is made at CPL=3 161 */ 162 163 /* 164 * XXX 165 * inout string emulation only supported in 64-bit mode. 166 * 167 * The #GP(0) fault conditions described above don't apply in 168 * 64-bit mode. 169 */ 170 if (vis->paging.cpu_mode != CPU_MODE_64BIT) { 171 VCPU_CTR1(vm, vcpuid, "ins/outs not emulated in cpu mode %d", 172 vis->paging.cpu_mode); 173 return (EINVAL); 174 } 175 176 /* 177 * XXX insb/insw/insd instructions not emulated at this time. 178 */ 179 if (in) { 180 VCPU_CTR0(vm, vcpuid, "ins emulation not implemented"); 181 return (EINVAL); 182 } 183 184 *retu = true; 185 return (0); /* Return to userspace to finish emulation */ 186} 187 188int 189vm_handle_inout(struct vm *vm, int vcpuid, struct vm_exit *vmexit, bool *retu) 190{ 191 int bytes, error; 192 193 bytes = vmexit->u.inout.bytes; 194 KASSERT(bytes == 1 || bytes == 2 || bytes == 4, 195 ("vm_handle_inout: invalid operand size %d", bytes)); 196 197 if (vmexit->u.inout.string) 198 error = emulate_inout_str(vm, vcpuid, vmexit, retu); 199 else 200 error = emulate_inout_port(vm, vcpuid, vmexit, retu); 201 202 VCPU_CTR4(vm, vcpuid, "%s%s 0x%04x: %s", 203 vmexit->u.inout.rep ? "rep " : "", 204 inout_instruction(vmexit), 205 vmexit->u.inout.port, 206 error ? "error" : (*retu ? "userspace" : "handled")); 207 208 return (error); 209} 210