Re: [PATCH v3 0/9] Parallel CPU bringup for x86_64

[Tom Lendacky]

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

> Thanks,
> Tom
>
> >