linux-kernel - Re: [PATCH] arm64: gic: increase the number of IRQ descriptors

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Date:   Tue, 3 Jan 2023 20:35:06 -0600
From:   Shanker Donthineni <sdonthineni@...dia.com>
To:     Catalin Marinas <catalin.marinas@....com>,
        Marc Zyngier <maz@...nel.org>, Will Deacon <will@...nel.org>,
        James Morse <james.morse@....com>
Cc:     linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] arm64: gic: increase the number of IRQ descriptors

Hi,

On 1/3/23 19:22, Shanker Donthineni wrote:
> The default value of NR_IRQS is not sufficient to support GICv4.1
> features and ~64K LPIs. This parameter would be too small for certain
> server platforms where it has many IO devices and is capable of
> direct injection of vSGI and vLPI features.
> 
> Currently, maximum of 64 + 8192 (IRQ_BITMAP_BITS) IRQ descriptors
> are allowed. The vCPU creation fails after reaching count ~400 with
> kvm-arm.vgic_v4_enable=1.
> 
> This patch increases NR_IRQS to 1^19  to cover 64K LPIs and 262144
> vSGIs (16K vPEs x 16).

Sorry, created a patch from the wrong kernel branch.
Please review v2 patch.