linux-kernel - Re: [PATCH] KVM: arm/arm64: vgic: Use a single IO device per redistributor

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Date:   Sun, 25 Aug 2019 11:04:35 +0100
From:   Marc Zyngier <marc.zyngier@....com>
To:     Eric Auger <eric.auger@...hat.com>
Cc:     eric.auger.pro@...il.com, linux-kernel@...r.kernel.org,
        kvm@...r.kernel.org, kvmarm@...ts.cs.columbia.edu,
        yuzenghui@...wei.com, zhang.zhanghailiang@...wei.com,
        wanghaibin.wang@...wei.com, james.morse@....com,
        qemu-arm@...gnu.org, julien.thierry.kdev@...il.com,
        suzuki.poulose@....com, peter.maydell@...aro.org,
        andre.przywara@....com
Subject: Re: [PATCH] KVM: arm/arm64: vgic: Use a single IO device per redistributor

On Fri, 23 Aug 2019 18:33:30 +0100,
Eric Auger <eric.auger@...hat.com> wrote:
> 
> At the moment we use 2 IO devices per GICv3 redistributor: one
> one for the RD_base frame and one for the SGI_base frame.
> 
> Instead we can use a single IO device per redistributor (the 2
> frames are contiguous). This saves slots on the KVM_MMIO_BUS
> which is currently limited to NR_IOBUS_DEVS (1000).
> 
> This change allows to instantiate up to 512 redistributors and may
> speed the guest boot with a large number of VCPUs.
> 
> Signed-off-by: Eric Auger <eric.auger@...hat.com>

Yup, that's exactly what I was hoping for. A very nice cleanup, and no
need to increase NR_IOBUS_DEVS for the foreseeable future.

I've applied this to -next.

Thanks,

	M.

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