ACPI_SIG_IVRS
{ACPI_SIG_IVRS, "I/O Virtualization Reporting Structure"},
{ACPI_SIG_IVRS, NULL, AcpiDmDumpIvrs, DtCompileIvrs, TemplateIvrs},
status = AcpiGetTable(ACPI_SIG_IVRS, 1, (ACPI_TABLE_HEADER **)&ivrs);
status = AcpiGetTable(ACPI_SIG_IVRS, 1, (ACPI_TABLE_HEADER **)&ivrs);