linux-kernel - Re: [PATCH] KVM: arm64: gic-v3: Only set ICH

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Message-ID: <176037441180.969330.798856280799815530.b4-ty@kernel.org>
Date: Mon, 13 Oct 2025 17:56:15 +0100
From: Marc Zyngier <maz@...nel.org>
To: linux-arm-kernel@...ts.infradead.org,
	kvmarm@...ts.linux.dev,
	linux-kernel@...r.kernel.org,
	kvm@...r.kernel.org,
	Sascha Bischoff <Sascha.Bischoff@....com>
Cc: nd <nd@....com>,
	oliver.upton@...ux.dev,
	Joey Gouly <Joey.Gouly@....com>,
	Suzuki Poulose <Suzuki.Poulose@....com>,
	yuzenghui@...wei.com
Subject: Re: [PATCH] KVM: arm64: gic-v3: Only set ICH_HCR traps for v2-on-v3 or v3 guests

On Tue, 07 Oct 2025 16:07:13 +0000, Sascha Bischoff wrote:
> The ICH_HCR_EL2 traps are used when running on GICv3 hardware, or when
> running a GICv3-based guest using FEAT_GCIE_LEGACY on GICv5
> hardware. When running a GICv2 guest on GICv3 hardware the traps are
> used to ensure that the guest never sees any part of GICv3 (only GICv2
> is visible to the guest), and when running a GICv3 guest they are used
> to trap in specific scenarios. They are not applicable for a
> GICv2-native guest, and won't be applicable for a(n upcoming) GICv5
> guest.
> 
> [...]

Applied to fixes, thanks!

[1/1] KVM: arm64: gic-v3: Only set ICH_HCR traps for v2-on-v3 or v3 guests
      commit: 3193287ddffbce29fd1a79d812f543c0fe4861d1

Cheers,

	M.
-- 
Without deviation from the norm, progress is not possible.