Messages in this thread | | | Date | Thu, 6 Feb 2014 19:45:34 -0500 | From | Jon <> | Subject | [PROBLEM] x86: result of verify_local_APIC() is ignored |
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In arch/x86/kernel/apic/apic.c there is a function called verify_local_APIC() that does some APIC checks. The part where it writes to the APIC ID register can cause CPU #15 to not come online under VMware ESXi on 32-bit kernels if the virtual hardware version is 8.
I noticed that Ingo actually removed this exact chunk of code from arch/i386/kernel/apic.c in 2.6.4, but since it was left in the x86_64 copy it came back when the two were merged. http://permalink.gmane.org/gmane.linux.kernel.commits.head/27538
The Intel architecture manuals seem to agree and notes that the recent Intel CPUs do not allow writing to the register which means that machines are actually failing this check... which doesn't matter becuase none of the callers are checking the return value of this function anyway.
-- Jon X(7): A program for managing terminal windows. See also screen(1).
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