int msix_init_exclusive_bar(PCIDevice *dev, unsigned short nentries, uint8_t bar_nr) { int ret; char *name; uint32_t bar_size = 4096; uint32_t bar_pba_offset = bar_size / 2; uint32_t bar_pba_size = (nentries / 8 + 1) * 8; /* * Migration compatibility dictates that this remains a 4k * BAR with the vector table in the lower half and PBA in * the upper half for nentries which is lower or equal to 128. * No need to care about using more than 65 entries for legacy * machine types who has at most 64 queues. */ if (nentries * PCI_MSIX_ENTRY_SIZE > bar_pba_offset) { bar_pba_offset = nentries * PCI_MSIX_ENTRY_SIZE; } if (bar_pba_offset + bar_pba_size > 4096) { bar_size = bar_pba_offset + bar_pba_size; } if (bar_size & (bar_size - 1)) { bar_size = 1 << qemu_fls(bar_size); } name = g_strdup_printf("%s-msix", dev->name); memory_region_init(&dev->msix_exclusive_bar, OBJECT(dev), name, bar_size); g_free(name); ret = msix_init(dev, nentries, &dev->msix_exclusive_bar, bar_nr, 0, &dev->msix_exclusive_bar, bar_nr, bar_pba_offset, 0); if (ret) { return ret; } pci_register_bar(dev, bar_nr, PCI_BASE_ADDRESS_SPACE_MEMORY, &dev->msix_exclusive_bar); return 0; }