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SubjectRe: [PATCH v3 0/9] Parallel CPU bringup for x86_64
On 12/20/21 3:47 PM, Tom Lendacky wrote:
> On 12/20/21 3:29 PM, David Woodhouse wrote:
>> On Mon, 2021-12-20 at 12:54 -0600, Tom Lendacky wrote:
>>> Took the tree back to commit df9726cb7178 and then applied this change.
>>> I'm unable to trigger any kind of failure with this change.
>> Hm... I fired up an EC2 m6a.48xlarge instance (192 CPUs) to play with.
>> I can reproduce your triple-fault on SMP bringup, but only with kexec.
>> And I basically can't get *anything* to kexec without that triple-
>> fault. Not a clean 5.16-rc2, not the Fedora stock 5.14.10 kernel.
>> If I *boot* instead of kexec, I have not yet seen the problem at all.
>> This is using Legacy BIOS not UEFI.
> Let me try with a legacy BIOS and see if I can repro. Might not be until
> tomorrow, though, since I had to let someone borrow the machine.

I still encounter the issue using a legacy BIOS (SeaBIOS).


> Thanks,
> Tom

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