297 lines
7.1 KiB
C
297 lines
7.1 KiB
C
/*-
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* Copyright (c) 2011 NetApp, Inc.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY NETAPP, INC ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL NETAPP, INC OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/linker_set.h>
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#include <sys/_iovec.h>
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#include <sys/mman.h>
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#include <x86/psl.h>
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#include <x86/segments.h>
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#include <machine/vmm.h>
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#include <machine/vmm_instruction_emul.h>
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#include <vmmapi.h>
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#include <stdio.h>
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#include <string.h>
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#include <assert.h>
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#include "bhyverun.h"
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#include "inout.h"
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SET_DECLARE(inout_port_set, struct inout_port);
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#define MAX_IOPORTS (1 << 16)
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#define VERIFY_IOPORT(port, size) \
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assert((port) >= 0 && (size) > 0 && ((port) + (size)) <= MAX_IOPORTS)
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static struct {
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const char *name;
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int flags;
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inout_func_t handler;
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void *arg;
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} inout_handlers[MAX_IOPORTS];
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static int
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default_inout(struct vmctx *ctx, int vcpu, int in, int port, int bytes,
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uint32_t *eax, void *arg)
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{
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if (in) {
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switch (bytes) {
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case 4:
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*eax = 0xffffffff;
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break;
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case 2:
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*eax = 0xffff;
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break;
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case 1:
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*eax = 0xff;
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break;
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}
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}
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return (0);
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}
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static void
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register_default_iohandler(int start, int size)
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{
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struct inout_port iop;
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VERIFY_IOPORT(start, size);
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bzero(&iop, sizeof(iop));
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iop.name = "default";
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iop.port = start;
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iop.size = size;
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iop.flags = IOPORT_F_INOUT | IOPORT_F_DEFAULT;
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iop.handler = default_inout;
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register_inout(&iop);
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}
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int
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emulate_inout(struct vmctx *ctx, int vcpu, struct vm_exit *vmexit, int strict)
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{
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int addrsize, bytes, flags, in, port, prot, rep;
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uint32_t val;
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inout_func_t handler;
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void *arg;
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int error, retval;
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enum vm_reg_name idxreg;
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uint64_t gla, index, iterations, count;
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struct vm_inout_str *vis;
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struct iovec iov[2];
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bytes = vmexit->u.inout.bytes;
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in = vmexit->u.inout.in;
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port = vmexit->u.inout.port;
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assert(port < MAX_IOPORTS);
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assert(bytes == 1 || bytes == 2 || bytes == 4);
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handler = inout_handlers[port].handler;
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if (strict && handler == default_inout)
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return (-1);
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flags = inout_handlers[port].flags;
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arg = inout_handlers[port].arg;
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if (in) {
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if (!(flags & IOPORT_F_IN))
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return (-1);
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} else {
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if (!(flags & IOPORT_F_OUT))
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return (-1);
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}
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retval = 0;
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if (vmexit->u.inout.string) {
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vis = &vmexit->u.inout_str;
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rep = vis->inout.rep;
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addrsize = vis->addrsize;
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prot = in ? PROT_WRITE : PROT_READ;
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assert(addrsize == 2 || addrsize == 4 || addrsize == 8);
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/* Index register */
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idxreg = in ? VM_REG_GUEST_RDI : VM_REG_GUEST_RSI;
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index = vis->index & vie_size2mask(addrsize);
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/* Count register */
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count = vis->count & vie_size2mask(addrsize);
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/* Limit number of back-to-back in/out emulations to 16 */
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iterations = MIN(count, 16);
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while (iterations > 0) {
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if (vie_calculate_gla(vis->paging.cpu_mode,
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vis->seg_name, &vis->seg_desc, index, bytes,
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addrsize, prot, &gla)) {
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error = vm_inject_exception2(ctx, vcpu,
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IDT_GP, 0);
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assert(error == 0);
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retval = INOUT_RESTART;
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break;
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}
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error = vm_gla2gpa(ctx, vcpu, &vis->paging, gla, bytes,
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prot, iov, nitems(iov));
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assert(error == 0 || error == 1 || error == -1);
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if (error) {
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retval = (error == 1) ? INOUT_RESTART :
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INOUT_ERROR;
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break;
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}
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if (vie_alignment_check(vis->paging.cpl, bytes,
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vis->cr0, vis->rflags, gla)) {
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error = vm_inject_exception2(ctx, vcpu,
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IDT_AC, 0);
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assert(error == 0);
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return (INOUT_RESTART);
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}
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val = 0;
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if (!in)
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vm_copyin(ctx, vcpu, iov, &val, bytes);
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retval = handler(ctx, vcpu, in, port, bytes, &val, arg);
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if (retval != 0)
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break;
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if (in)
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vm_copyout(ctx, vcpu, &val, iov, bytes);
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/* Update index */
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if (vis->rflags & PSL_D)
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index -= bytes;
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else
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index += bytes;
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count--;
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iterations--;
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}
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/* Update index register */
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error = vie_update_register(ctx, vcpu, idxreg, index, addrsize);
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assert(error == 0);
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/*
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* Update count register only if the instruction had a repeat
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* prefix.
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*/
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if (rep) {
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error = vie_update_register(ctx, vcpu, VM_REG_GUEST_RCX,
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count, addrsize);
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assert(error == 0);
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}
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/* Restart the instruction if more iterations remain */
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if (retval == INOUT_OK && count != 0)
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retval = INOUT_RESTART;
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} else {
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if (!in) {
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val = vmexit->u.inout.eax & vie_size2mask(bytes);
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}
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retval = handler(ctx, vcpu, in, port, bytes, &val, arg);
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if (retval == 0 && in) {
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vmexit->u.inout.eax &= ~vie_size2mask(bytes);
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vmexit->u.inout.eax |= val & vie_size2mask(bytes);
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}
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}
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return (retval);
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}
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void
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init_inout(void)
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{
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struct inout_port **iopp, *iop;
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/*
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* Set up the default handler for all ports
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*/
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register_default_iohandler(0, MAX_IOPORTS);
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/*
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* Overwrite with specified handlers
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*/
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SET_FOREACH(iopp, inout_port_set) {
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iop = *iopp;
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assert(iop->port < MAX_IOPORTS);
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inout_handlers[iop->port].name = iop->name;
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inout_handlers[iop->port].flags = iop->flags;
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inout_handlers[iop->port].handler = iop->handler;
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inout_handlers[iop->port].arg = NULL;
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}
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}
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int
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register_inout(struct inout_port *iop)
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{
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int i;
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VERIFY_IOPORT(iop->port, iop->size);
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/*
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* Verify that the new registration is not overwriting an already
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* allocated i/o range.
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*/
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if ((iop->flags & IOPORT_F_DEFAULT) == 0) {
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for (i = iop->port; i < iop->port + iop->size; i++) {
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if ((inout_handlers[i].flags & IOPORT_F_DEFAULT) == 0)
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return (-1);
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}
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}
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for (i = iop->port; i < iop->port + iop->size; i++) {
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inout_handlers[i].name = iop->name;
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inout_handlers[i].flags = iop->flags;
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inout_handlers[i].handler = iop->handler;
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inout_handlers[i].arg = iop->arg;
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}
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return (0);
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}
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int
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unregister_inout(struct inout_port *iop)
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{
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VERIFY_IOPORT(iop->port, iop->size);
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assert(inout_handlers[iop->port].name == iop->name);
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register_default_iohandler(iop->port, iop->size);
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return (0);
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}
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