linux-kernel - Re: [PATCH] KVM: arm64: vgic-v3: Trap all if no in-kernel irqchip

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Message-ID: <e2d3e614-4e5e-7ad9-5cc6-867d85dca5c0@redhat.com>
Date: Mon, 27 Oct 2025 15:02:22 +0100 (CET)
From: Sebastian Ott <sebott@...hat.com>
To: Sascha Bischoff <Sascha.Bischoff@....com>
cc: "linux-arm-kernel@...ts.infradead.org" <linux-arm-kernel@...ts.infradead.org>, 
    "kvmarm@...ts.linux.dev" <kvmarm@...ts.linux.dev>, 
    "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, 
    "kvm@...r.kernel.org" <kvm@...r.kernel.org>, nd <nd@....com>, 
    "maz@...nel.org" <maz@...nel.org>, 
    "broonie@...nel.org" <broonie@...nel.org>, 
    "oliver.upton@...ux.dev" <oliver.upton@...ux.dev>, 
    Joey Gouly <Joey.Gouly@....com>, Suzuki Poulose <Suzuki.Poulose@....com>, 
    "yuzenghui@...wei.com" <yuzenghui@...wei.com>
Subject: Re: [PATCH] KVM: arm64: vgic-v3: Trap all if no in-kernel irqchip

On Tue, 21 Oct 2025, Sascha Bischoff wrote:

> If there is no in-kernel irqchip for a GICv3 host set all of the trap
> bits to block all accesses. This fixes the no-vgic-v3 selftest again.
>
> Fixes: 3193287ddffb ("KVM: arm64: gic-v3: Only set ICH_HCR traps for v2-on-v3 or v3 guests")
> Reported-by: Mark Brown <broonie@...nel.org>
> Closes: https://lore.kernel.org/all/23072856-6b8c-41e2-93d1-ea8a240a7079@sirena.org.uk
> Signed-off-by: Sascha Bischoff <sascha.bischoff@....com>

Reviewed-by: Sebastian Ott <sebott@...hat.com>