vmm_ioport.c

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    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: releng/11.0/sys/amd64/vmm/vmm_ioport.c 282287 2015-04-30 22:23:22Z neel $");
   29 
   30 #include <sys/param.h>
   31 #include <sys/systm.h>
   32 
   33 #include <machine/vmm.h>
   34 #include <machine/vmm_instruction_emul.h>
   35 
   36 #include "vatpic.h"
   37 #include "vatpit.h"
   38 #include "vpmtmr.h"
   39 #include "vrtc.h"
   40 #include "vmm_ioport.h"
   41 #include "vmm_ktr.h"
   42 
   43 #define MAX_IOPORTS             1280
   44 
   45 ioport_handler_func_t ioport_handler[MAX_IOPORTS] = {
   46         [TIMER_MODE] = vatpit_handler,
   47         [TIMER_CNTR0] = vatpit_handler,
   48         [TIMER_CNTR1] = vatpit_handler,
   49         [TIMER_CNTR2] = vatpit_handler,
   50         [NMISC_PORT] = vatpit_nmisc_handler,
   51         [IO_ICU1] = vatpic_master_handler,
   52         [IO_ICU1 + ICU_IMR_OFFSET] = vatpic_master_handler,
   53         [IO_ICU2] = vatpic_slave_handler,
   54         [IO_ICU2 + ICU_IMR_OFFSET] = vatpic_slave_handler,
   55         [IO_ELCR1] = vatpic_elc_handler,
   56         [IO_ELCR2] = vatpic_elc_handler,
   57         [IO_PMTMR] = vpmtmr_handler,
   58         [IO_RTC] = vrtc_addr_handler,
   59         [IO_RTC + 1] = vrtc_data_handler,
   60 };
   61 
   62 #ifdef KTR
   63 static const char *
   64 inout_instruction(struct vm_exit *vmexit)
   65 {
   66         int index;
   67 
   68         static const char *iodesc[] = {
   69                 "outb", "outw", "outl",
   70                 "inb", "inw", "inl",
   71                 "outsb", "outsw", "outsd",
   72                 "insb", "insw", "insd",
   73         };
   74 
   75         switch (vmexit->u.inout.bytes) {
   76         case 1:
   77                 index = 0;
   78                 break;
   79         case 2:
   80                 index = 1;
   81                 break;
   82         default:
   83                 index = 2;
   84                 break;
   85         }
   86 
   87         if (vmexit->u.inout.in)
   88                 index += 3;
   89 
   90         if (vmexit->u.inout.string)
   91                 index += 6;
   92 
   93         KASSERT(index < nitems(iodesc), ("%s: invalid index %d",
   94             __func__, index));
   95 
   96         return (iodesc[index]);
   97 }
   98 #endif  /* KTR */
   99 
  100 static int
  101 emulate_inout_port(struct vm *vm, int vcpuid, struct vm_exit *vmexit,
  102     bool *retu)
  103 {
  104         ioport_handler_func_t handler;
  105         uint32_t mask, val;
  106         int error;
  107 
  108         /*
  109          * If there is no handler for the I/O port then punt to userspace.
  110          */
  111         if (vmexit->u.inout.port >= MAX_IOPORTS ||
  112             (handler = ioport_handler[vmexit->u.inout.port]) == NULL) {
  113                 *retu = true;
  114                 return (0);
  115         }
  116 
  117         mask = vie_size2mask(vmexit->u.inout.bytes);
  118 
  119         if (!vmexit->u.inout.in) {
  120                 val = vmexit->u.inout.eax & mask;
  121         }
  122 
  123         error = (*handler)(vm, vcpuid, vmexit->u.inout.in,
  124             vmexit->u.inout.port, vmexit->u.inout.bytes, &val);
  125         if (error) {
  126                 /*
  127                  * The value returned by this function is also the return value
  128                  * of vm_run(). This needs to be a positive number otherwise it
  129                  * can be interpreted as a "pseudo-error" like ERESTART.
  130                  *
  131                  * Enforce this by mapping all errors to EIO.
  132                  */
  133                 return (EIO);
  134         }
  135 
  136         if (vmexit->u.inout.in) {
  137                 vmexit->u.inout.eax &= ~mask;
  138                 vmexit->u.inout.eax |= val & mask;
  139                 error = vm_set_register(vm, vcpuid, VM_REG_GUEST_RAX,
  140                     vmexit->u.inout.eax);
  141                 KASSERT(error == 0, ("emulate_ioport: error %d setting guest "
  142                     "rax register", error));
  143         }
  144         *retu = false;
  145         return (0);
  146 }
  147 
  148 static int
  149 emulate_inout_str(struct vm *vm, int vcpuid, struct vm_exit *vmexit, bool *retu)
  150 {
  151         *retu = true;
  152         return (0);     /* Return to userspace to finish emulation */
  153 }
  154 
  155 int
  156 vm_handle_inout(struct vm *vm, int vcpuid, struct vm_exit *vmexit, bool *retu)
  157 {
  158         int bytes, error;
  159 
  160         bytes = vmexit->u.inout.bytes;
  161         KASSERT(bytes == 1 || bytes == 2 || bytes == 4,
  162             ("vm_handle_inout: invalid operand size %d", bytes));
  163 
  164         if (vmexit->u.inout.string)
  165                 error = emulate_inout_str(vm, vcpuid, vmexit, retu);
  166         else
  167                 error = emulate_inout_port(vm, vcpuid, vmexit, retu);
  168 
  169         VCPU_CTR4(vm, vcpuid, "%s%s 0x%04x: %s",
  170             vmexit->u.inout.rep ? "rep " : "",
  171             inout_instruction(vmexit),
  172             vmexit->u.inout.port,
  173             error ? "error" : (*retu ? "userspace" : "handled"));
  174 
  175         return (error);
  176 }

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FreeBSD/Linux Kernel Cross Reference sys/amd64/vmm/vmm_ioport.c

FreeBSD/Linux Kernel Cross Reference
sys/amd64/vmm/vmm_ioport.c