[Bug 215459] VM freezes starting with kernel 5.15

[bugzilla-daemon@bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=215459

--- Comment #10 from mlevitsk@redhat.com ---
On Mon, 2022-01-10 at 09:30 +0000, bugzilla-daemon@bugzilla.kernel.org wrote:
> https://bugzilla.kernel.org/show_bug.cgi?id=215459
> 
> --- Comment #9 from th3voic3@mailbox.org ---
> I've compiled the 5.16 kernel now and so far it's looking very good. APICv
> and
> tdp_mmu are both enabled. Also thanks to dynamic PREEMPT I no longer need to
> recompile to enable voluntary preemption to cut down my VMs boot time.
> 
Great to hear that.

I am just curious, with what PREEMPT setting, the boot is slow?
With full preemption? I also noticed that long ago, before I joined redhat,
back when I was just a VFIO fan, that booting with large amounts of ram
(32 back then I think), forced preemption and passed-through GPU makes
The VM hang for about like 1/2 of a minute before it shows the bios splash
screen.

Best regards,
        Maxim Levitsky

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