void *kqemu_vmalloc(size_t size) { static int phys_ram_fd = -1; static int phys_ram_size = 0; const char *tmpdir; char phys_ram_file[1024]; void *ptr; struct statfs stfs; if (phys_ram_fd < 0) { tmpdir = getenv("QEMU_TMPDIR"); if (!tmpdir) tmpdir = "/dev/shm"; if (statfs(tmpdir, &stfs) == 0) { int64_t free_space; int ram_mb; extern int ram_size; free_space = (int64_t)stfs.f_bavail * stfs.f_bsize; if ((ram_size + 8192 * 1024) >= free_space) { ram_mb = (ram_size / (1024 * 1024)); fprintf(stderr, "You do not have enough space in '%s' for the %d MB of QEMU virtual RAM.\n", tmpdir, ram_mb); if (strcmp(tmpdir, "/dev/shm") == 0) { fprintf(stderr, "To have more space available provided you have enough RAM and swap, do as root:\n" "umount /dev/shm\n" "mount -t tmpfs -o size=%dm none /dev/shm\n", ram_mb + 16); } else { fprintf(stderr, "Use the '-m' option of QEMU to diminish the amount of virtual RAM or use the\n" "QEMU_TMPDIR environment variable to set another directory where the QEMU\n" "temporary RAM file will be opened.\n"); } fprintf(stderr, "Or disable the accelerator module with -no-kqemu\n"); exit(1); } } snprintf(phys_ram_file, sizeof(phys_ram_file), "%s/qemuXXXXXX", tmpdir); if (mkstemp(phys_ram_file) < 0) { fprintf(stderr, "warning: could not create temporary file in '%s'.\n" "Use QEMU_TMPDIR to select a directory in a tmpfs filesystem.\n" "Using '/tmp' as fallback.\n", tmpdir); snprintf(phys_ram_file, sizeof(phys_ram_file), "%s/qemuXXXXXX", "/tmp"); if (mkstemp(phys_ram_file) < 0) { fprintf(stderr, "Could not create temporary memory file '%s'\n", phys_ram_file); exit(1); } } phys_ram_fd = open(phys_ram_file, O_CREAT | O_TRUNC | O_RDWR, 0600); if (phys_ram_fd < 0) { fprintf(stderr, "Could not open temporary memory file '%s'\n", phys_ram_file); exit(1); } unlink(phys_ram_file); } size = (size + 4095) & ~4095; ftruncate(phys_ram_fd, phys_ram_size + size); ptr = mmap(NULL, size, PROT_WRITE | PROT_READ, MAP_SHARED, phys_ram_fd, phys_ram_size); if (ptr == MAP_FAILED) { fprintf(stderr, "Could not map physical memory\n"); exit(1); } phys_ram_size += size; return ptr; }
void *kqemu_vmalloc(size_t size) { static int phys_ram_fd = -1; static int phys_ram_size = 0; const char *tmpdir; char phys_ram_file[1024]; void *ptr; struct statfs stfs; if (phys_ram_fd < 0) { tmpdir = getenv("QEMU_TMPDIR"); if (!tmpdir) tmpdir = "/dev/shm"; if (statfs(tmpdir, &stfs) == 0) { int64_t free_space; int ram_mb; extern int ram_size; free_space = (int64_t)stfs.f_bavail * stfs.f_bsize; if ((ram_size + 8192 * 1024) >= free_space) { ram_mb = (ram_size / (1024 * 1024)); fprintf(stderr, "You do not have enough space in '%s' for the %d MB of QEMU virtual RAM.\n", tmpdir, ram_mb); if (strcmp(tmpdir, "/dev/shm") == 0) { fprintf(stderr, "To have more space available provided you have enough RAM and swap, do as root:\n" "umount /dev/shm\n" "mount -t tmpfs -o size=%dm none /dev/shm\n", ram_mb + 16); } else { fprintf(stderr, "Use the '-m' option of QEMU to diminish the amount of virtual RAM or use the\n" "QEMU_TMPDIR environment variable to set another directory where the QEMU\n" "temporary RAM file will be opened.\n"); } fprintf(stderr, "Or disable the accelerator module with -no-kqemu\n"); exit(1); } } snprintf(phys_ram_file, sizeof(phys_ram_file), "%s/qemuXXXXXX", tmpdir); if (mkstemp(phys_ram_file) < 0) { fprintf(stderr, "warning: could not create temporary file in '%s'.\n" "Use QEMU_TMPDIR to select a directory in a tmpfs filesystem.\n" "Using '/tmp' as fallback.\n", tmpdir); snprintf(phys_ram_file, sizeof(phys_ram_file), "%s/qemuXXXXXX", "/tmp"); if (mkstemp(phys_ram_file) < 0) { fprintf(stderr, "Could not create temporary memory file '%s'\n", phys_ram_file); exit(1); } } phys_ram_fd = open(phys_ram_file, O_CREAT | O_TRUNC | O_RDWR, 0600); if (phys_ram_fd < 0) { fprintf(stderr, "Could not open temporary memory file '%s'\n", phys_ram_file); exit(1); } unlink(phys_ram_file); } size = (size + 4095) & ~4095; ftruncate(phys_ram_fd, phys_ram_size + size); ptr = mmap(NULL, size, PROT_WRITE | PROT_READ, MAP_SHARED, phys_ram_fd, phys_ram_size); if (ptr == MAP_FAILED) { fprintf(stderr, "Could not map physical memory\n"); exit(1); } phys_ram_size += size; return ptr; }