void *pci_assign_dev_load_option_rom(PCIDevice *dev, struct Object *owner, int *size, unsigned int domain, unsigned int bus, unsigned int slot, unsigned int function) { char name[32], rom_file[64]; FILE *fp; uint8_t val; struct stat st; void *ptr = NULL; /* If loading ROM from file, pci handles it */ if (dev->romfile || !dev->rom_bar) { return NULL; } snprintf(rom_file, sizeof(rom_file), "/sys/bus/pci/devices/%04x:%02x:%02x.%01x/rom", domain, bus, slot, function); if (stat(rom_file, &st)) { return NULL; } if (access(rom_file, F_OK)) { error_report("pci-assign: Insufficient privileges for %s", rom_file); return NULL; } /* Write "1" to the ROM file to enable it */ fp = fopen(rom_file, "r+"); if (fp == NULL) { return NULL; } val = 1; if (fwrite(&val, 1, 1, fp) != 1) { goto close_rom; } fseek(fp, 0, SEEK_SET); snprintf(name, sizeof(name), "%s.rom", object_get_typename(owner)); memory_region_init_ram(&dev->rom, owner, name, st.st_size, &error_abort); vmstate_register_ram(&dev->rom, &dev->qdev); ptr = memory_region_get_ram_ptr(&dev->rom); memset(ptr, 0xff, st.st_size); if (!fread(ptr, 1, st.st_size, fp)) { error_report("pci-assign: Cannot read from host %s", rom_file); error_printf("Device option ROM contents are probably invalid " "(check dmesg).\nSkip option ROM probe with rombar=0, " "or load from file with romfile=\n"); goto close_rom; } pci_register_bar(dev, PCI_ROM_SLOT, 0, &dev->rom); dev->has_rom = true; *size = st.st_size; close_rom: /* Write "0" to disable ROM */ fseek(fp, 0, SEEK_SET); val = 0; if (!fwrite(&val, 1, 1, fp)) { DEBUG("%s\n", "Failed to disable pci-sysfs rom file"); } fclose(fp); return ptr; }