1de7b4b805
Mainly focus on files that use BSD 2-Clause license, however the tool I was using misidentified many licenses so this was mostly a manual - error prone - task. The Software Package Data Exchange (SPDX) group provides a specification to make it easier for automated tools to detect and summarize well known opensource licenses. We are gradually adopting the specification, noting that the tags are considered only advisory and do not, in any way, superceed or replace the license texts. No functional change intended.
300 lines
7.2 KiB
C
300 lines
7.2 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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*
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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 eax, val;
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inout_func_t handler;
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void *arg;
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int error, fault, 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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assert(retval == 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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vm_inject_gp(ctx, vcpu);
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break;
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}
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error = vm_copy_setup(ctx, vcpu, &vis->paging, gla,
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bytes, prot, iov, nitems(iov), &fault);
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if (error) {
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retval = -1; /* Unrecoverable error */
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break;
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} else if (fault) {
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retval = 0; /* Resume guest to handle fault */
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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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vm_inject_ac(ctx, vcpu, 0);
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break;
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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 == 0 && count != 0) {
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error = vm_restart_instruction(ctx, vcpu);
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assert(error == 0);
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}
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} else {
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eax = vmexit->u.inout.eax;
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val = eax & vie_size2mask(bytes);
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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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eax &= ~vie_size2mask(bytes);
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eax |= val & vie_size2mask(bytes);
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error = vm_set_register(ctx, vcpu, VM_REG_GUEST_RAX,
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eax);
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assert(error == 0);
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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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