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Re: [PATCH] Revert "intel_iommu: Fix irqchip / X2APIC configuration chec


From: Peter Xu
Subject: Re: [PATCH] Revert "intel_iommu: Fix irqchip / X2APIC configuration checks"
Date: Fri, 23 Sep 2022 21:27:08 -0400

On Fri, Sep 23, 2022 at 06:03:44PM -0400, Peter Xu wrote:
> On Fri, Sep 23, 2022 at 10:41:59AM +0200, Igor Mammedov wrote:
> > It's worth putting history excavation with explanation what is broken and 
> > why
> > compat stuff is being ignored in the patch.
> 
> Makes sense, I'll amend the commit message and repost.  Thanks,

There's actually one way to slightly remedy this single case, mostly for
any QEMU 7.1.0 user with -smp <=8 and the intel iommu (as 77250171bdc02 is
merged only in 7.1.0).

We can have one compact parameter x-eim-enable-kvm-x2apic, setting it "on"
by default, "off" for 7.1, and "on" for 7.0-.

I'm not very sure whether that'll worth it.  Any thoughts?

-- 
Peter Xu




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