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Fix extended topology enumeration leaf#7087
Merged
russell-islam merged 1 commit intocloud-hypervisor:mainfrom May 22, 2025
Merged
Fix extended topology enumeration leaf#7087russell-islam merged 1 commit intocloud-hypervisor:mainfrom
russell-islam merged 1 commit intocloud-hypervisor:mainfrom
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When booting a Linux guest in SMP configuration, the following kernel warning can be observed: [Firmware Bug]: CPUID leaf 0xb subleaf 1 APIC ID mismatch 1 != 0 The reason is that we announce the presence of the extended topology leaf, but fail to announce the x2apic ID in EDX. Signed-off-by: Thomas Prescher <thomas.prescher@cyberus-technology.de> On-behalf-of: SAP thomas.prescher@sap.com
phip1611
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May 21, 2025
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rbradford
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May 21, 2025
russell-islam
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May 21, 2025
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When booting a Linux guest in SMP configuration, the following kernel warning can be observed:
[Firmware Bug]: CPUID leaf 0xb subleaf 1 APIC ID mismatch 1 != 0The reason is that we announce the presence of the extended topology leaf, but fail to announce the x2apic ID in EDX.
I found this issue because I am currently working on x86_64 support for >255 vCPUs where this fix is absolutely needed in order to convince Linux to boot the additional processors above 255.