Re: [PATCH] x86: q35: require split irqchip for large CPU count

[David Woodhouse]

On Fri, 2022-03-11 at 09:39 -0500, Igor Mammedov wrote:
> if VM is started with:
> 
>    -enable-kvm -smp 256
> 
> without specifying 'split' irqchip, VM might eventually boot
> but no more than 255 CPUs will be operational and following
> error messages in guest could be observed:
>    ...
>    smpboot: native_cpu_up: bad cpu 256
>    ...
> It's a regression introduced by [1], which removed dependency
> on intremap=on that were implicitly requiring 'split' irqchip
> and forgot to check for 'split' irqchip.
> Instead of letting VM boot a broken VM, error out and tell
> user how to fix CLI.

Hm, wasn't that already fixed in the patches I posted in December?

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