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acpi-build: tweak acpi migration limits

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- Tweak error message for legacy machine type:
  Basically if table size exceeds the limits we set all
  bets are off for migration: e.g. it can start failing even
  within given qemu minor version simply because of a bugfix.
- Increase table size to 128k.
- Make sure we notice it long before we start getting close to the
  128k limit: warn at 64k.
- Don't fail if we exceed the limit: most people don't care about
  migration, even less people care about cross version miration.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Michael S. Tsirkin 2014-07-28 23:07:11 +02:00
parent 18045fb9f4
commit 868270f23d
1 changed files with 9 additions and 7 deletions
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16
hw/i386/acpi-build.c
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@ -62,7 +62,7 @@
#define ACPI_BUILD_LEGACY_CPU_AML_SIZE 97
#define ACPI_BUILD_ALIGN_SIZE 0x1000
#define ACPI_BUILD_TABLE_SIZE 0x10000
#define ACPI_BUILD_TABLE_SIZE 0x20000
typedef struct AcpiCpuInfo {
DECLARE_BITMAP(found_cpus, ACPI_CPU_HOTPLUG_ID_LIMIT);
@ -1586,17 +1586,19 @@ void acpi_build(PcGuestInfo *guest_info, AcpiBuildTables *tables)
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.");
error_report("Warning: migration may not work.");
}
g_array_set_size(tables->table_data, legacy_table_size);
} else {
if (tables->table_data->len > ACPI_BUILD_TABLE_SIZE) {
/* Make sure we have a buffer in case we need to resize the tables. */
if (tables->table_data->len > ACPI_BUILD_TABLE_SIZE / 2) {
/* 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);
error_report("Warning: ACPI tables are larger than 64k.");
error_report("Warning: migration may not work.");
error_report("Warning: please remove CPUs, NUMA nodes, "
"memory slots or PCI bridges.");
}
g_array_set_size(tables->table_data, ACPI_BUILD_TABLE_SIZE);
acpi_align_size(tables->table_data, ACPI_BUILD_TABLE_SIZE);
}
acpi_align_size(tables->linker, ACPI_BUILD_ALIGN_SIZE);