linux-kernel - Re: [PATCH v9 0/8] Parallel CPU bringup for x86

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Date:   Mon, 20 Feb 2023 17:40:05 +0100
From:   Oleksandr Natalenko <oleksandr@...alenko.name>
To:     tglx@...utronix.de, kim.phillips@....com,
        Usama Arif <usama.arif@...edance.com>,
        David Woodhouse <dwmw2@...radead.org>
Cc:     arjan@...ux.intel.com, mingo@...hat.com, bp@...en8.de,
        dave.hansen@...ux.intel.com, hpa@...or.com, x86@...nel.org,
        pbonzini@...hat.com, paulmck@...nel.org,
        linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
        rcu@...r.kernel.org, mimoja@...oja.de, hewenliang4@...wei.com,
        thomas.lendacky@....com, seanjc@...gle.com, pmenzel@...gen.mpg.de,
        fam.zheng@...edance.com, punit.agrawal@...edance.com,
        simon.evans@...edance.com, liangma@...ngbit.com
Subject: Re: [PATCH v9 0/8] Parallel CPU bringup for x86_64

Hello.

Thank you for your reply.

On pondělí 20. února 2023 17:20:13 CET David Woodhouse wrote:
> On Mon, 2023-02-20 at 17:08 +0100, Oleksandr Natalenko wrote:
> > 
> > I've applied this to the v6.2 kernel, and suspend/resume broke on my
> > Ryzen 5950X desktop. The machine suspends just fine, but on resume
> > the screen stays blank, and there's no visible disk I/O.
> > 
> > Reverting the series brings suspend/resume back to working state.
> 
> Hm, thanks. What if you add 'no_parallel_bringup' on the command line?

If the `no_parallel_bringup` param is added, the suspend/resume works.

> Is that using X2APIC?

Probably?

```
$ dmesg | grep -i x2apic
[    0.632740] x2apic: IRQ remapping doesn't support X2APIC mode
```

> If so, what about 'nox2apic' on the command line?

If `no_parallel_bringup` is removed and `nox2apic` is added, then the `x2apic: …` stuff disappears from dmesg, but suspend/resume remains broken.

-- 
Oleksandr Natalenko (post-factum)