void acpi_build(PcGuestInfo *guest_info, AcpiBuildTables *tables) { GArray *table_offsets; unsigned facs, ssdt, dsdt, rsdt; AcpiCpuInfo cpu; AcpiPmInfo pm; AcpiMiscInfo misc; AcpiMcfgInfo mcfg; PcPciInfo pci; uint8_t *u; size_t aml_len = 0; acpi_get_cpu_info(&cpu); acpi_get_pm_info(&pm); acpi_get_dsdt(&misc); acpi_get_misc_info(&misc); acpi_get_pci_info(&pci); table_offsets = g_array_new(false, true /* clear */, sizeof(uint32_t)); ACPI_BUILD_DPRINTF(3, "init ACPI tables\n"); bios_linker_loader_alloc(tables->linker, ACPI_BUILD_TABLE_FILE, 64 /* Ensure FACS is aligned */, false /* high memory */); /* * FACS is pointed to by FADT. * We place it first since it's the only table that has alignment * requirements. */ facs = tables->table_data->len; build_facs(tables->table_data, tables->linker, guest_info); /* DSDT is pointed to by FADT */ dsdt = tables->table_data->len; build_dsdt(tables->table_data, tables->linker, &misc); /* Count the size of the DSDT and SSDT, we will need it for legacy * sizing of ACPI tables. */ aml_len += tables->table_data->len - dsdt; /* ACPI tables pointed to by RSDT */ acpi_add_table(table_offsets, tables->table_data); build_fadt(tables->table_data, tables->linker, &pm, facs, dsdt); ssdt = tables->table_data->len; acpi_add_table(table_offsets, tables->table_data); build_ssdt(tables->table_data, tables->linker, &cpu, &pm, &misc, &pci, guest_info); aml_len += tables->table_data->len - ssdt; acpi_add_table(table_offsets, tables->table_data); build_madt(tables->table_data, tables->linker, &cpu, guest_info); if (misc.has_hpet) { acpi_add_table(table_offsets, tables->table_data); build_hpet(tables->table_data, tables->linker); } if (guest_info->numa_nodes) { acpi_add_table(table_offsets, tables->table_data); build_srat(tables->table_data, tables->linker, &cpu, guest_info); } if (acpi_get_mcfg(&mcfg)) { acpi_add_table(table_offsets, tables->table_data); build_mcfg_q35(tables->table_data, tables->linker, &mcfg); } /* Add tables supplied by user (if any) */ for (u = acpi_table_first(); u; u = acpi_table_next(u)) { unsigned len = acpi_table_len(u); acpi_add_table(table_offsets, tables->table_data); g_array_append_vals(tables->table_data, u, len); } /* RSDT is pointed to by RSDP */ rsdt = tables->table_data->len; build_rsdt(tables->table_data, tables->linker, table_offsets); /* RSDP is in FSEG memory, so allocate it separately */ build_rsdp(tables->rsdp, tables->linker, rsdt); /* We'll expose it all to Guest so we want to reduce * chance of size changes. * RSDP is small so it's easy to keep it immutable, no need to * bother with alignment. * * We used to align the tables to 4k, but of course this would * too simple to be enough. 4k turned out to be too small an * alignment very soon, and in fact it is almost impossible to * keep the table size stable for all (max_cpus, max_memory_slots) * combinations. So the table size is always 64k for pc-i440fx-2.1 * and we give an error if the table grows beyond that limit. * * We still have the problem of migrating from "-M pc-i440fx-2.0". For * that, we exploit the fact that QEMU 2.1 generates _smaller_ tables * than 2.0 and we can always pad the smaller tables with zeros. We can * then use the exact size of the 2.0 tables. * * All this is for PIIX4, since QEMU 2.0 didn't support Q35 migration. */ if (guest_info->legacy_acpi_table_size) { /* Subtracting aml_len gives the size of fixed tables. Then add the * size of the PIIX4 DSDT/SSDT in QEMU 2.0. */ int legacy_aml_len = guest_info->legacy_acpi_table_size + ACPI_BUILD_LEGACY_CPU_AML_SIZE * max_cpus; int legacy_table_size = ROUND_UP(tables->table_data->len - aml_len + legacy_aml_len, ACPI_BUILD_ALIGN_SIZE); if (tables->table_data->len > legacy_table_size) { /* Should happen only with PCI bridges and -M pc-i440fx-2.0. */ error_report("Warning: migration to QEMU 2.0 may not work."); } g_array_set_size(tables->table_data, legacy_table_size); } else { if (tables->table_data->len > ACPI_BUILD_TABLE_SIZE) { /* As of QEMU 2.1, this fires with 160 VCPUs and 255 memory slots. */ error_report("ACPI tables are larger than 64k. Please remove"); error_report("CPUs, NUMA nodes, memory slots or PCI bridges."); exit(1); } g_array_set_size(tables->table_data, ACPI_BUILD_TABLE_SIZE); } acpi_align_size(tables->linker, ACPI_BUILD_ALIGN_SIZE); /* Cleanup memory that's no longer used. */ g_array_free(table_offsets, true); }