258 lines
6.9 KiB
C
258 lines
6.9 KiB
C
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/*-
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* BSD LICENSE
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*
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* Copyright(c) 2010-2014 Intel Corporation. All rights reserved.
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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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*
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* * 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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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* * Neither the name of Intel Corporation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <stdint.h>
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#include <dirent.h>
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#include <linux/vhost.h>
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#include <linux/virtio_net.h>
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#include <fuse/cuse_lowlevel.h>
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#include <stddef.h>
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#include <string.h>
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#include <stdlib.h>
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#include <sys/eventfd.h>
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#include <sys/mman.h>
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#include <sys/types.h>
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#include <unistd.h>
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#include <errno.h>
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#include <rte_log.h>
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#include "vhost-net.h"
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/* Line size for reading maps file. */
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static const uint32_t BUFSIZE = PATH_MAX;
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/* Size of prot char array in procmap. */
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#define PROT_SZ 5
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/* Number of elements in procmap struct. */
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#define PROCMAP_SZ 8
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/* Structure containing information gathered from maps file. */
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struct procmap {
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uint64_t va_start; /* Start virtual address in file. */
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uint64_t len; /* Size of file. */
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uint64_t pgoff; /* Not used. */
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uint32_t maj; /* Not used. */
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uint32_t min; /* Not used. */
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uint32_t ino; /* Not used. */
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char prot[PROT_SZ]; /* Not used. */
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char fname[PATH_MAX]; /* File name. */
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};
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/*
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* Locate the file containing QEMU's memory space and
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* map it to our address space.
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*/
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static int
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host_memory_map(struct virtio_net *dev, struct virtio_memory *mem,
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pid_t pid, uint64_t addr)
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{
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struct dirent *dptr = NULL;
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struct procmap procmap;
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DIR *dp = NULL;
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int fd;
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int i;
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char memfile[PATH_MAX];
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char mapfile[PATH_MAX];
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char procdir[PATH_MAX];
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char resolved_path[PATH_MAX];
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char *path = NULL;
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FILE *fmap;
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void *map;
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uint8_t found = 0;
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char line[BUFSIZE];
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char dlm[] = "- : ";
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char *str, *sp, *in[PROCMAP_SZ];
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char *end = NULL;
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/* Path where mem files are located. */
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snprintf(procdir, PATH_MAX, "/proc/%u/fd/", pid);
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/* Maps file used to locate mem file. */
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snprintf(mapfile, PATH_MAX, "/proc/%u/maps", pid);
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fmap = fopen(mapfile, "r");
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if (fmap == NULL) {
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RTE_LOG(ERR, VHOST_CONFIG,
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"(%"PRIu64") Failed to open maps file for pid %d\n",
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dev->device_fh, pid);
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return -1;
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}
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/* Read through maps file until we find out base_address. */
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while (fgets(line, BUFSIZE, fmap) != 0) {
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str = line;
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errno = 0;
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/* Split line into fields. */
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for (i = 0; i < PROCMAP_SZ; i++) {
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in[i] = strtok_r(str, &dlm[i], &sp);
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if ((in[i] == NULL) || (errno != 0)) {
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fclose(fmap);
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return -1;
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}
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str = NULL;
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}
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/* Convert/Copy each field as needed. */
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procmap.va_start = strtoull(in[0], &end, 16);
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if ((in[0] == '\0') || (end == NULL) || (*end != '\0') ||
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(errno != 0)) {
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fclose(fmap);
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return -1;
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}
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procmap.len = strtoull(in[1], &end, 16);
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if ((in[1] == '\0') || (end == NULL) || (*end != '\0') ||
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(errno != 0)) {
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fclose(fmap);
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return -1;
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}
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procmap.pgoff = strtoull(in[3], &end, 16);
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if ((in[3] == '\0') || (end == NULL) || (*end != '\0') ||
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(errno != 0)) {
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fclose(fmap);
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return -1;
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}
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procmap.maj = strtoul(in[4], &end, 16);
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if ((in[4] == '\0') || (end == NULL) || (*end != '\0') ||
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(errno != 0)) {
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fclose(fmap);
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return -1;
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}
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procmap.min = strtoul(in[5], &end, 16);
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if ((in[5] == '\0') || (end == NULL) || (*end != '\0') ||
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(errno != 0)) {
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fclose(fmap);
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return -1;
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}
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procmap.ino = strtoul(in[6], &end, 16);
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if ((in[6] == '\0') || (end == NULL) || (*end != '\0') ||
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(errno != 0)) {
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fclose(fmap);
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return -1;
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}
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memcpy(&procmap.prot, in[2], PROT_SZ);
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memcpy(&procmap.fname, in[7], PATH_MAX);
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if (procmap.va_start == addr) {
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procmap.len = procmap.len - procmap.va_start;
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found = 1;
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break;
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}
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}
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fclose(fmap);
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if (!found) {
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RTE_LOG(ERR, VHOST_CONFIG,
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"(%"PRIu64") Failed to find memory file in pid %d maps file\n",
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dev->device_fh, pid);
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return -1;
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}
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/* Find the guest memory file among the process fds. */
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dp = opendir(procdir);
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if (dp == NULL) {
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RTE_LOG(ERR, VHOST_CONFIG,
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"(%"PRIu64") Cannot open pid %d process directory\n",
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dev->device_fh, pid);
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return -1;
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}
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found = 0;
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/* Read the fd directory contents. */
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while (NULL != (dptr = readdir(dp))) {
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snprintf(memfile, PATH_MAX, "/proc/%u/fd/%s",
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pid, dptr->d_name);
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path = realpath(memfile, resolved_path);
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if ((path == NULL) && (strlen(resolved_path) == 0)) {
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RTE_LOG(ERR, VHOST_CONFIG,
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"(%"PRIu64") Failed to resolve fd directory\n",
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dev->device_fh);
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closedir(dp);
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return -1;
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}
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if (strncmp(resolved_path, procmap.fname,
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strnlen(procmap.fname, PATH_MAX)) == 0) {
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found = 1;
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break;
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}
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}
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closedir(dp);
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if (found == 0) {
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RTE_LOG(ERR, VHOST_CONFIG,
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"(%"PRIu64") Failed to find memory file for pid %d\n",
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dev->device_fh, pid);
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return -1;
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}
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/* Open the shared memory file and map the memory into this process. */
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fd = open(memfile, O_RDWR);
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if (fd == -1) {
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RTE_LOG(ERR, VHOST_CONFIG,
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"(%"PRIu64") Failed to open %s for pid %d\n",
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dev->device_fh, memfile, pid);
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return -1;
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}
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map = mmap(0, (size_t)procmap.len, PROT_READ|PROT_WRITE,
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MAP_POPULATE|MAP_SHARED, fd, 0);
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close(fd);
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if (map == MAP_FAILED) {
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RTE_LOG(ERR, VHOST_CONFIG,
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"(%"PRIu64") Error mapping the file %s for pid %d\n",
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dev->device_fh, memfile, pid);
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return -1;
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}
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/* Store the memory address and size in the device data structure */
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mem->mapped_address = (uint64_t)(uintptr_t)map;
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mem->mapped_size = procmap.len;
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LOG_DEBUG(VHOST_CONFIG,
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"(%"PRIu64") Mem File: %s->%s - Size: %llu - VA: %p\n",
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dev->device_fh,
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memfile, resolved_path,
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(unsigned long long)mem->mapped_size, map);
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return 0;
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}
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