diff mbox series

FWTS still checks the _UID of GIC entries for cores with _STA set to 0, causing the test to fail

Message ID PSAPR06MB44396744597B313D3DC6CDA08E8BA@PSAPR06MB4439.apcprd06.prod.outlook.com
State Superseded
Headers show
Series FWTS still checks the _UID of GIC entries for cores with _STA set to 0, causing the test to fail | expand

Commit Message

Monty Zhao May 8, 2025, 9:45 a.m. UTC 
Hi,

BUG Link:Bug #2110175 “FWTS still checks the _UID of GIC entries for core...” : Bugs : fwts package : Ubuntu<https://bugs.launchpad.net/ubuntu/+source/fwts/+bug/2110175>
When certain CPU cores are disabled (i.e., their _STA value is changed from 0xF to 0x0), FWTS correctly skips these cores. However, it still checks whether the _UID in the MADT GIC entries matches the UID of the cores, which causes the test to FAIL.
log like this:
madt: GICC has no matching processor UID x.
This behavior is not compliant with the ACPI specification, as the correct way to indicate whether a GIC is used by the OS is through the Flags field in the MADT GICC entries, not the _STA value.
URL:https://uefi.org/htmlspecs/ACPI_Spec_6_4_html/05_ACPI_Software_Programming_Model/ACPI_Software_Programming_Model.html?highlight=madt#gicc-cpu-interface-flags
We've made a little modification to fix this:

Thanks,
Monty




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diff mbox series

Patch

diff --git a/src/acpi/madt/madt.c b/src/acpi/madt/madt.c
index 0b6d00ad..21e614a6 100644
--- a/src/acpi/madt/madt.c
+++ b/src/acpi/madt/madt.c
@@ -1083,7 +1083,8 @@  static int madt_gicc(fwts_framework *fw,
                            "MADT %s reserved field properly set to zero.",
                            madt_sub_names[hdr->type]);

-       madt_find_processor_uid(fw, gic->processor_uid, "GICC");
+       if((gic->flags & 1) != 0)
+               madt_find_processor_uid(fw, gic->processor_uid, "GICC");

        mask = 0xfffffffc;
        start = 2;