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Re: [Qemu-devel] [PATCH 2/4] q35: set split kernel irqchip as default

From: Paolo Bonzini
Subject: Re: [Qemu-devel] [PATCH 2/4] q35: set split kernel irqchip as default
Date: Wed, 19 Dec 2018 21:12:55 +0100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.3.1

On 19/12/18 09:50, Peter Xu wrote:
> Starting from QEMU 4.0, let's specify "split" as the default value for
> kernel-irqchip.
> So for QEMU>=4.0 we'll have: allowed=Y,required=N,split=Y
>    for QEMU<=3.1 we'll have: allowed=Y,required=N,split=N
>    (omitting all the "kernel_irqchip_" prefix)
> Note that this "split" is optional - we'll first try to enable split
> kernel irqchip, and we'll fall back to complete kernel irqchip if we
> found that the kernel capability is missing.

Please just fail completely and require a new kernel for the 4.0 machine
type.  There are subtle differences between kernel and QEMU irqchip, I
don't think we want to open that can of worms.


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