-/*
- * Locate the file containing QEMU's memory space and map it to our address space.
- */
-static int
-host_memory_map(struct virtio_net *dev, struct virtio_memory *mem,
- pid_t pid, uint64_t addr)
-{
- struct dirent *dptr = NULL;
- struct procmap procmap;
- DIR *dp = NULL;
- int fd;
- int i;
- char memfile[PATH_MAX];
- char mapfile[PATH_MAX];
- char procdir[PATH_MAX];
- char resolved_path[PATH_MAX];
- FILE *fmap;
- void *map;
- uint8_t found = 0;
- char line[BUFSIZE];
- char dlm[] = "- : ";
- char *str, *sp, *in[PROCMAP_SZ];
- char *end = NULL;
-
- /* Path where mem files are located. */
- snprintf(procdir, PATH_MAX, "/proc/%u/fd/", pid);
- /* Maps file used to locate mem file. */
- snprintf(mapfile, PATH_MAX, "/proc/%u/maps", pid);
-
- fmap = fopen(mapfile, "r");
- if (fmap == NULL) {
- RTE_LOG(ERR, VHOST_CONFIG,
- "(%"PRIu64") Failed to open maps file for pid %d\n",
- dev->device_fh, pid);
- return -1;
- }
-
- /* Read through maps file until we find out base_address. */
- while (fgets(line, BUFSIZE, fmap) != 0) {
- str = line;
- errno = 0;
- /* Split line in to fields. */
- for (i = 0; i < PROCMAP_SZ; i++) {
- in[i] = strtok_r(str, &dlm[i], &sp);
- if ((in[i] == NULL) || (errno != 0)) {
- fclose(fmap);
- return -1;
- }
- str = NULL;
- }
-
- /* Convert/Copy each field as needed. */
- procmap.va_start = strtoull(in[0], &end, 16);
- if ((in[0] == '\0') || (end == NULL) || (*end != '\0') || (errno != 0)) {
- fclose(fmap);
- return -1;
- }
-
- procmap.len = strtoull(in[1], &end, 16);
- if ((in[1] == '\0') || (end == NULL) || (*end != '\0') || (errno != 0)) {
- fclose(fmap);
- return -1;
- }
-
- procmap.pgoff = strtoull(in[3], &end, 16);
- if ((in[3] == '\0') || (end == NULL) || (*end != '\0') || (errno != 0)) {
- fclose(fmap);
- return -1;
- }
-
- procmap.maj = strtoul(in[4], &end, 16);
- if ((in[4] == '\0') || (end == NULL) || (*end != '\0') || (errno != 0)) {
- fclose(fmap);
- return -1;
- }
-
- procmap.min = strtoul(in[5], &end, 16);
- if ((in[5] == '\0') || (end == NULL) || (*end != '\0') || (errno != 0)) {
- fclose(fmap);
- return -1;
- }
-
- procmap.ino = strtoul(in[6], &end, 16);
- if ((in[6] == '\0') || (end == NULL) || (*end != '\0') || (errno != 0)) {
- fclose(fmap);
- return -1;
- }
-
- memcpy(&procmap.prot, in[2], PROT_SZ);
- memcpy(&procmap.fname, in[7], PATH_MAX);
-
- if (procmap.va_start == addr) {
- procmap.len = procmap.len - procmap.va_start;
- found = 1;
- break;
- }
- }
- fclose(fmap);
-
- if (!found) {
- RTE_LOG(ERR, VHOST_CONFIG, "(%"PRIu64") Failed to find memory file in pid %d maps file\n", dev->device_fh, pid);
- return -1;
- }
-
- /* Find the guest memory file among the process fds. */
- dp = opendir(procdir);
- if (dp == NULL) {
- RTE_LOG(ERR, VHOST_CONFIG, "(%"PRIu64") Cannot open pid %d process directory\n", dev->device_fh, pid);
- return -1;
-
- }
-
- found = 0;
-
- /* Read the fd directory contents. */
- while (NULL != (dptr = readdir(dp))) {
- snprintf(memfile, PATH_MAX, "/proc/%u/fd/%s",
- pid, dptr->d_name);
- realpath(memfile, resolved_path);
- if (resolved_path == NULL) {
- RTE_LOG(ERR, VHOST_CONFIG, "(%"PRIu64") Failed to resolve fd directory\n", dev->device_fh);
- closedir(dp);
- return -1;
- }
- if (strncmp(resolved_path, procmap.fname,
- strnlen(procmap.fname, PATH_MAX)) == 0) {
- found = 1;
- break;
- }
- }
-
- closedir(dp);
-
- if (found == 0) {
- RTE_LOG(ERR, VHOST_CONFIG, "(%"PRIu64") Failed to find memory file for pid %d\n", dev->device_fh, pid);
- return -1;
- }
- /* Open the shared memory file and map the memory into this process. */
- fd = open(memfile, O_RDWR);
-
- if (fd == -1) {
- RTE_LOG(ERR, VHOST_CONFIG, "(%"PRIu64") Failed to open %s for pid %d\n", dev->device_fh, memfile, pid);
- return -1;
- }
-
- map = mmap(0, (size_t)procmap.len, PROT_READ|PROT_WRITE ,
- MAP_POPULATE|MAP_SHARED, fd, 0);
- close(fd);
-
- if (map == MAP_FAILED) {
- RTE_LOG(ERR, VHOST_CONFIG, "(%"PRIu64") Error mapping the file %s for pid %d\n", dev->device_fh, memfile, pid);
- return -1;
- }
-
- /* Store the memory address and size in the device data structure */
- mem->mapped_address = (uint64_t)(uintptr_t)map;
- mem->mapped_size = procmap.len;
-
- LOG_DEBUG(VHOST_CONFIG, "(%"PRIu64") Mem File: %s->%s - Size: %llu - VA: %p\n", dev->device_fh,
- memfile, resolved_path, (long long unsigned)mem->mapped_size, map);
-
- return 0;
-}