diff options
| -rw-r--r-- | hw/i386/acpi-build.c | 16 |
1 files changed, 14 insertions, 2 deletions
diff --git a/hw/i386/acpi-build.c b/hw/i386/acpi-build.c index f1054dd831..7597517b97 100644 --- a/hw/i386/acpi-build.c +++ b/hw/i386/acpi-build.c @@ -1055,9 +1055,21 @@ build_ssdt(GArray *table_data, GArray *linker, { GArray *package = build_alloc_array(); - uint8_t op = 0x13; /* VarPackageOp */ + uint8_t op; + + /* + * Note: The ability to create variable-sized packages was first introduced in ACPI 2.0. ACPI 1.0 only + * allowed fixed-size packages with up to 255 elements. + * Windows guests up to win2k8 fail when VarPackageOp is used. + */ + if (acpi_cpus <= 255) { + op = 0x12; /* PackageOp */ + build_append_byte(package, acpi_cpus); /* NumElements */ + } else { + op = 0x13; /* VarPackageOp */ + build_append_int(package, acpi_cpus); /* VarNumElements */ + } - build_append_int(package, acpi_cpus); /* VarNumElements */ for (i = 0; i < acpi_cpus; i++) { uint8_t b = test_bit(i, cpu->found_cpus) ? 0x01 : 0x00; build_append_byte(package, b); |