vmm_ioport.c

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    1 /*-
    2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
    3  *
    4  * Copyright (c) 2014 Tycho Nightingale <tycho.nightingale@pluribusnetworks.com>
    5  * All rights reserved.
    6  *
    7  * Redistribution and use in source and binary forms, with or without
    8  * modification, are permitted provided that the following conditions
    9  * are met:
   10  * 1. Redistributions of source code must retain the above copyright
   11  *    notice, this list of conditions and the following disclaimer.
   12  * 2. Redistributions in binary form must reproduce the above copyright
   13  *    notice, this list of conditions and the following disclaimer in the
   14  *    documentation and/or other materials provided with the distribution.
   15  *
   16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND
   17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   19  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   26  * SUCH DAMAGE.
   27  */
   28 
   29 #include <sys/cdefs.h>
   30 __FBSDID("$FreeBSD$");
   31 
   32 #include <sys/param.h>
   33 #include <sys/systm.h>
   34 
   35 #include <machine/vmm.h>
   36 #include <machine/vmm_instruction_emul.h>
   37 
   38 #include "vatpic.h"
   39 #include "vatpit.h"
   40 #include "vpmtmr.h"
   41 #include "vrtc.h"
   42 #include "vmm_ioport.h"
   43 #include "vmm_ktr.h"
   44 
   45 #define MAX_IOPORTS             1280
   46 
   47 ioport_handler_func_t ioport_handler[MAX_IOPORTS] = {
   48         [TIMER_MODE] = vatpit_handler,
   49         [TIMER_CNTR0] = vatpit_handler,
   50         [TIMER_CNTR1] = vatpit_handler,
   51         [TIMER_CNTR2] = vatpit_handler,
   52         [NMISC_PORT] = vatpit_nmisc_handler,
   53         [IO_ICU1] = vatpic_master_handler,
   54         [IO_ICU1 + ICU_IMR_OFFSET] = vatpic_master_handler,
   55         [IO_ICU2] = vatpic_slave_handler,
   56         [IO_ICU2 + ICU_IMR_OFFSET] = vatpic_slave_handler,
   57         [IO_ELCR1] = vatpic_elc_handler,
   58         [IO_ELCR2] = vatpic_elc_handler,
   59         [IO_PMTMR] = vpmtmr_handler,
   60         [IO_RTC] = vrtc_addr_handler,
   61         [IO_RTC + 1] = vrtc_data_handler,
   62 };
   63 
   64 #ifdef KTR
   65 static const char *
   66 inout_instruction(struct vm_exit *vmexit)
   67 {
   68         int index;
   69 
   70         static const char *iodesc[] = {
   71                 "outb", "outw", "outl",
   72                 "inb", "inw", "inl",
   73                 "outsb", "outsw", "outsd",
   74                 "insb", "insw", "insd",
   75         };
   76 
   77         switch (vmexit->u.inout.bytes) {
   78         case 1:
   79                 index = 0;
   80                 break;
   81         case 2:
   82                 index = 1;
   83                 break;
   84         default:
   85                 index = 2;
   86                 break;
   87         }
   88 
   89         if (vmexit->u.inout.in)
   90                 index += 3;
   91 
   92         if (vmexit->u.inout.string)
   93                 index += 6;
   94 
   95         KASSERT(index < nitems(iodesc), ("%s: invalid index %d",
   96             __func__, index));
   97 
   98         return (iodesc[index]);
   99 }
  100 #endif  /* KTR */
  101 
  102 static int
  103 emulate_inout_port(struct vcpu *vcpu, struct vm_exit *vmexit, bool *retu)
  104 {
  105         ioport_handler_func_t handler;
  106         uint32_t mask, val;
  107         int error;
  108 
  109         /*
  110          * If there is no handler for the I/O port then punt to userspace.
  111          */
  112         if (vmexit->u.inout.port >= MAX_IOPORTS ||
  113             (handler = ioport_handler[vmexit->u.inout.port]) == NULL) {
  114                 *retu = true;
  115                 return (0);
  116         }
  117 
  118         mask = vie_size2mask(vmexit->u.inout.bytes);
  119 
  120         if (!vmexit->u.inout.in) {
  121                 val = vmexit->u.inout.eax & mask;
  122         }
  123 
  124         error = (*handler)(vcpu_vm(vcpu), vmexit->u.inout.in,
  125             vmexit->u.inout.port, vmexit->u.inout.bytes, &val);
  126         if (error) {
  127                 /*
  128                  * The value returned by this function is also the return value
  129                  * of vm_run(). This needs to be a positive number otherwise it
  130                  * can be interpreted as a "pseudo-error" like ERESTART.
  131                  *
  132                  * Enforce this by mapping all errors to EIO.
  133                  */
  134                 return (EIO);
  135         }
  136 
  137         if (vmexit->u.inout.in) {
  138                 vmexit->u.inout.eax &= ~mask;
  139                 vmexit->u.inout.eax |= val & mask;
  140                 error = vm_set_register(vcpu, VM_REG_GUEST_RAX,
  141                     vmexit->u.inout.eax);
  142                 KASSERT(error == 0, ("emulate_ioport: error %d setting guest "
  143                     "rax register", error));
  144         }
  145         *retu = false;
  146         return (0);
  147 }
  148 
  149 static int
  150 emulate_inout_str(struct vcpu *vcpu, struct vm_exit *vmexit, bool *retu)
  151 {
  152         *retu = true;
  153         return (0);     /* Return to userspace to finish emulation */
  154 }
  155 
  156 int
  157 vm_handle_inout(struct vcpu *vcpu, struct vm_exit *vmexit, bool *retu)
  158 {
  159         int bytes __diagused, error;
  160 
  161         bytes = vmexit->u.inout.bytes;
  162         KASSERT(bytes == 1 || bytes == 2 || bytes == 4,
  163             ("vm_handle_inout: invalid operand size %d", bytes));
  164 
  165         if (vmexit->u.inout.string)
  166                 error = emulate_inout_str(vcpu, vmexit, retu);
  167         else
  168                 error = emulate_inout_port(vcpu, vmexit, retu);
  169 
  170         VCPU_CTR4(vcpu_vm(vcpu), vcpu_vcpuid(vcpu), "%s%s 0x%04x: %s",
  171             vmexit->u.inout.rep ? "rep " : "",
  172             inout_instruction(vmexit),
  173             vmexit->u.inout.port,
  174             error ? "error" : (*retu ? "userspace" : "handled"));
  175 
  176         return (error);
  177 }

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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