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| author | Jeremy Compostella <jeremy.compostella@intel.com> | 2023-09-01 16:17:51 -0700 |
|---|---|---|
| committer | Subrata Banik <subratabanik@google.com> | 2023-09-12 16:08:57 +0000 |
| commit | ba7a9eefcf4e571bc73d4be1141f676fc5547057 (patch) | |
| tree | 15c15536bac498a1229465ef3df85e34d817b26a /src/arch | |
| parent | 2a6a79c70657435880be7f00e48debdd559b91b5 (diff) | |
soc/intel/common: Fix invalid MADT entries creation
commit f8ac3dda02f22ebf857efb5b845db97f00598f7d ("soc/intel/common:
Order the CPUs based on their APIC IDs") sort algorithnm walks all the
`cpu_info' entries without discarding empty ones. Since `cpu_info' is
not initialized, the data that is used is undefined and it generally
results in the creation of invalid `Local x2APIC' entries in the
MADT ("APIC") ACPI table.
Depending on the X2APIC ID value the Linux kernel behavior
changes (cf. arch/x86/kernel/acpi/boot.c::acpi_register_lapic()):
1. If (int)ID >= MAX_LOCAL_APIC (32768), the Linux kernel discards the
entry with the "skipped apicid that is too big" INFO level
message.
2. If (int)ID < MAX_LOCAL_APIC (32768) (including negative) this data
is taken into account and it can lead to undesirable behavior such
as core being disabled as (cf. "native_cpu_up: bad cpu" ERROR
kernel message).
TEST=Verified the MADT does not contain any invalid entries on rex.
Change-Id: I19c7aa51f232bf48201bd6d28f108e9120a21f7e
Signed-off-by: Jeremy Compostella <jeremy.compostella@intel.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/77615
Reviewed-by: Bora Guvendik <bora.guvendik@intel.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Wonkyu Kim <wonkyu.kim@intel.com>
Diffstat (limited to 'src/arch')
| -rw-r--r-- | src/arch/x86/cpu.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/src/arch/x86/cpu.c b/src/arch/x86/cpu.c index cb616c96ca..f4c18c2643 100644 --- a/src/arch/x86/cpu.c +++ b/src/arch/x86/cpu.c @@ -302,7 +302,7 @@ void arch_bootstate_coreboot_exit(void) /* cpu_info() looks at address 0 at the base of %gs for a pointer to struct cpu_info */ static struct per_cpu_segment_data segment_data[CONFIG_MAX_CPUS]; -struct cpu_info cpu_infos[CONFIG_MAX_CPUS]; +struct cpu_info cpu_infos[CONFIG_MAX_CPUS] = {0}; enum cb_err set_cpu_info(unsigned int index, struct device *cpu) { |