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| author | Paolo Bonzini | 2014-07-28 17:34:16 +0200 |
|---|---|---|
| committer | Michael S. Tsirkin | 2014-07-29 12:26:12 +0200 |
| commit | 18045fb9f457a0f0cba2bd113c748a2dcb4ed39e (patch) | |
| tree | 865890d54e44a6d7532474ac43141a69d676ba8c /hw/i386 | |
| parent | acpi-build: minor code cleanup (diff) | |
| download | qemu-18045fb9f457a0f0cba2bd113c748a2dcb4ed39e.tar.gz qemu-18045fb9f457a0f0cba2bd113c748a2dcb4ed39e.tar.xz qemu-18045fb9f457a0f0cba2bd113c748a2dcb4ed39e.zip | |
pc: future-proof migration-compatibility of ACPI tables
This patch avoids that similar changes break QEMU again in the future.
QEMU will now hard-code 64k as the maximum ACPI table size, which
(despite being an order of magnitude smaller than 640k) should be enough
for everyone.
Reviewed-by: Laszlo Ersek <lersek@redhat.com>
Tested-by: Igor Mammedov <imammedo@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Diffstat (limited to 'hw/i386')
| -rw-r--r-- | hw/i386/acpi-build.c | 10 |
1 files changed, 9 insertions, 1 deletions
diff --git a/hw/i386/acpi-build.c b/hw/i386/acpi-build.c index ec86f1b311..2178894f67 100644 --- a/hw/i386/acpi-build.c +++ b/hw/i386/acpi-build.c @@ -62,6 +62,8 @@ #define ACPI_BUILD_LEGACY_CPU_AML_SIZE 97 #define ACPI_BUILD_ALIGN_SIZE 0x1000 +#define ACPI_BUILD_TABLE_SIZE 0x10000 + typedef struct AcpiCpuInfo { DECLARE_BITMAP(found_cpus, ACPI_CPU_HOTPLUG_ID_LIMIT); } AcpiCpuInfo; @@ -1588,7 +1590,13 @@ void acpi_build(PcGuestInfo *guest_info, AcpiBuildTables *tables) } g_array_set_size(tables->table_data, legacy_table_size); } else { - acpi_align_size(tables->table_data, ACPI_BUILD_ALIGN_SIZE); + 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); |