static void pci_ivshmem_realize(PCIDevice *dev, Error **errp) { IVShmemState *s = IVSHMEM(dev); Error *err = NULL; uint8_t *pci_conf; uint8_t attr = PCI_BASE_ADDRESS_SPACE_MEMORY | PCI_BASE_ADDRESS_MEM_PREFETCH; if (!!s->server_chr + !!s->shmobj + !!s->hostmem != 1) { error_setg(errp, "You must specify either 'shm', 'chardev' or 'x-memdev'"); return; } if (s->hostmem) { MemoryRegion *mr; if (s->sizearg) { g_warning("size argument ignored with hostmem"); } mr = host_memory_backend_get_memory(s->hostmem, &error_abort); s->ivshmem_size = memory_region_size(mr); } else if (s->sizearg == NULL) { s->ivshmem_size = 4 << 20; /* 4 MB default */ } else { char *end; int64_t size = qemu_strtosz(s->sizearg, &end); if (size < 0 || *end != '\0' || !is_power_of_2(size)) { error_setg(errp, "Invalid size %s", s->sizearg); return; } s->ivshmem_size = size; } /* IRQFD requires MSI */ if (ivshmem_has_feature(s, IVSHMEM_IOEVENTFD) && !ivshmem_has_feature(s, IVSHMEM_MSI)) { error_setg(errp, "ioeventfd/irqfd requires MSI"); return; } /* 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 { error_setg(errp, "'role' must be 'peer' or 'master'"); return; } } else { s->role_val = IVSHMEM_MASTER; /* default */ } pci_conf = dev->config; pci_conf[PCI_COMMAND] = PCI_COMMAND_IO | PCI_COMMAND_MEMORY; /* * Note: we don't use INTx with IVSHMEM_MSI at all, so this is a * bald-faced lie then. But it's a backwards compatible lie. */ pci_config_set_interrupt_pin(pci_conf, 1); memory_region_init_io(&s->ivshmem_mmio, OBJECT(s), &ivshmem_mmio_ops, s, "ivshmem-mmio", IVSHMEM_REG_BAR_SIZE); /* region for registers*/ pci_register_bar(dev, 0, PCI_BASE_ADDRESS_SPACE_MEMORY, &s->ivshmem_mmio); memory_region_init(&s->bar, OBJECT(s), "ivshmem-bar2-container", s->ivshmem_size); if (s->ivshmem_64bit) { attr |= PCI_BASE_ADDRESS_MEM_TYPE_64; } if (s->hostmem != NULL) { MemoryRegion *mr; IVSHMEM_DPRINTF("using hostmem\n"); mr = host_memory_backend_get_memory(MEMORY_BACKEND(s->hostmem), &error_abort); vmstate_register_ram(mr, DEVICE(s)); memory_region_add_subregion(&s->bar, 0, mr); pci_register_bar(PCI_DEVICE(s), 2, attr, &s->bar); } else if (s->server_chr != NULL) { /* FIXME do not rely on what chr drivers put into filename */ if (strncmp(s->server_chr->filename, "unix:", 5)) { error_setg(errp, "chardev is not a unix client socket"); return; } /* if we get a UNIX socket as the parameter we will talk * to the ivshmem server to receive the memory region */ IVSHMEM_DPRINTF("using shared memory server (socket = %s)\n", s->server_chr->filename); if (ivshmem_setup_interrupts(s) < 0) { error_setg(errp, "failed to initialize interrupts"); return; } /* we allocate enough space for 16 peers and grow as needed */ resize_peers(s, 16); s->vm_id = -1; pci_register_bar(dev, 2, attr, &s->bar); qemu_chr_add_handlers(s->server_chr, ivshmem_can_receive, ivshmem_check_version, NULL, s); } else { /* just map the file immediately, we're not using a server */ int fd; 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) { error_report("could not truncate shared file"); } } else if ((fd = shm_open(s->shmobj, O_CREAT|O_RDWR, S_IRWXU|S_IRWXG|S_IRWXO)) < 0) { error_setg(errp, "could not open shared file"); return; } if (check_shm_size(s, fd, errp) == -1) { return; } create_shared_memory_BAR(s, fd, attr, &err); if (err) { error_propagate(errp, err); return; } } fifo8_create(&s->incoming_fifo, sizeof(int64_t)); if (s->role_val == IVSHMEM_PEER) { error_setg(&s->migration_blocker, "Migration is disabled when using feature 'peer mode' in device 'ivshmem'"); migrate_add_blocker(s->migration_blocker); } }