static int pci_ivshmem_init(PCIDevice *dev) { IVShmemState *s = DO_UPCAST(IVShmemState, dev, dev); uint8_t *pci_conf; if (s->sizearg == NULL) s->ivshmem_size = 4 << 20; /* 4 MB default */ else { s->ivshmem_size = ivshmem_get_size(s); } register_savevm(&s->dev.qdev, "ivshmem", 0, 0, ivshmem_save, ivshmem_load, dev); /* IRQFD requires MSI */ if (ivshmem_has_feature(s, IVSHMEM_IOEVENTFD) && !ivshmem_has_feature(s, IVSHMEM_MSI)) { fprintf(stderr, "ivshmem: ioeventfd/irqfd requires MSI\n"); exit(1); } /* check that role is reasonable */ if (s->role) { if (strncmp(s->role, "peer", 5) == 0) { s->role_val = IVSHMEM_PEER; } else if (strncmp(s->role, "master", 7) == 0) { s->role_val = IVSHMEM_MASTER; } else { fprintf(stderr, "ivshmem: 'role' must be 'peer' or 'master'\n"); exit(1); } } else { s->role_val = IVSHMEM_MASTER; /* default */ } if (s->role_val == IVSHMEM_PEER) { register_device_unmigratable(&s->dev.qdev, "ivshmem", s); } pci_conf = s->dev.config; pci_config_set_vendor_id(pci_conf, PCI_VENDOR_ID_REDHAT_QUMRANET); pci_conf[0x02] = 0x10; pci_conf[0x03] = 0x11; pci_conf[PCI_COMMAND] = PCI_COMMAND_IO | PCI_COMMAND_MEMORY; pci_config_set_class(pci_conf, PCI_CLASS_MEMORY_RAM); pci_conf[PCI_HEADER_TYPE] = PCI_HEADER_TYPE_NORMAL; pci_config_set_interrupt_pin(pci_conf, 1); s->shm_pci_addr = 0; s->ivshmem_offset = 0; s->shm_fd = 0; s->ivshmem_mmio_io_addr = cpu_register_io_memory(ivshmem_mmio_read, ivshmem_mmio_write, s, DEVICE_NATIVE_ENDIAN); /* region for registers*/ pci_register_bar(&s->dev, 0, IVSHMEM_REG_BAR_SIZE, PCI_BASE_ADDRESS_SPACE_MEMORY, ivshmem_mmio_map); if ((s->server_chr != NULL) && (strncmp(s->server_chr->filename, "unix:", 5) == 0)) { /* if we get a UNIX socket as the parameter we will talk * to the ivshmem server to receive the memory region */ if (s->shmobj != NULL) { fprintf(stderr, "WARNING: do not specify both 'chardev' " "and 'shm' with ivshmem\n"); } IVSHMEM_DPRINTF("using shared memory server (socket = %s)\n", s->server_chr->filename); if (ivshmem_has_feature(s, IVSHMEM_MSI)) { ivshmem_setup_msi(s); } /* we allocate enough space for 16 guests and grow as needed */ s->nb_peers = 16; s->vm_id = -1; /* allocate/initialize space for interrupt handling */ s->peers = qemu_mallocz(s->nb_peers * sizeof(Peer)); pci_register_bar(&s->dev, 2, s->ivshmem_size, PCI_BASE_ADDRESS_SPACE_MEMORY, ivshmem_map); s->eventfd_chr = qemu_mallocz(s->vectors * sizeof(CharDriverState *)); qemu_chr_add_handlers(s->server_chr, ivshmem_can_receive, ivshmem_read, ivshmem_event, s); } else { /* just map the file immediately, we're not using a server */ int fd; if (s->shmobj == NULL) { fprintf(stderr, "Must specify 'chardev' or 'shm' to ivshmem\n"); } IVSHMEM_DPRINTF("using shm_open (shm object = %s)\n", s->shmobj); /* try opening with O_EXCL and if it succeeds zero the memory * by truncating to 0 */ if ((fd = shm_open(s->shmobj, O_CREAT|O_RDWR|O_EXCL, S_IRWXU|S_IRWXG|S_IRWXO)) > 0) { /* truncate file to length PCI device's memory */ if (ftruncate(fd, s->ivshmem_size) != 0) { fprintf(stderr, "ivshmem: could not truncate shared file\n"); } } else if ((fd = shm_open(s->shmobj, O_CREAT|O_RDWR, S_IRWXU|S_IRWXG|S_IRWXO)) < 0) { fprintf(stderr, "ivshmem: could not open shared file\n"); exit(-1); } if (check_shm_size(s, fd) == -1) { exit(-1); } create_shared_memory_BAR(s, fd); } return 0; }