The code that calculates the legacy ACPI table size for migration
compatibility uses max_cpus when calculating legacy_aml_len (the size of
the DSDT and SSDT tables). However, the SSDT grows according to APIC ID
limit, not max_cpus.
The bug is not triggered very often because of the 4k alignment on the
table size. But it can be triggered if you are unlucky enough to cross a
4k boundary.
Change the legacy_aml_len calculation to use apic_id_limit, to calculate
the right size.
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
*/
int legacy_aml_len =
pcmc->legacy_acpi_table_size +
- ACPI_BUILD_LEGACY_CPU_AML_SIZE * max_cpus;
+ ACPI_BUILD_LEGACY_CPU_AML_SIZE * pcms->apic_id_limit;
int legacy_table_size =
ROUND_UP(tables_blob->len - aml_len + legacy_aml_len,
ACPI_BUILD_ALIGN_SIZE);