linux-kernel - Re: [PATCH 0/2] Enable GICv5 Legacy CPUIF trapping & fix TDIR cap test

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Message-ID: <176952293346.2010102.7303410175644418702.b4-ty@kernel.org>
Date: Tue, 27 Jan 2026 14:09:03 +0000
From: Marc Zyngier <maz@...nel.org>
To: sascha.bischoff@...glemail.com,
	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>,
	Joey Gouly <Joey.Gouly@....com>,
	Suzuki Poulose <Suzuki.Poulose@....com>,
	yuzenghui@...wei.com,
	will@...nel.org,
	Oliver Upton <oupton@...nel.org>
Subject: Re: [PATCH 0/2] Enable GICv5 Legacy CPUIF trapping & fix TDIR cap test

On Mon, 08 Dec 2025 15:28:22 +0000, Sascha Bischoff wrote:
> These changes address two trapping-related issues when running legacy
> (i.e. GICv3) guests on GICv5 hosts.
> 
> The first change enables the vgic_v3_cpuif_trap static branch on GICv5
> hosts with legacy support, if trapping is required. The missing enable
> was caught as part of debugging why UNDEFs were being injected into
> guests when the ICH_HCR_EL2.TC bit was set - the expected bahaviour
> was that KVM should handle the trapped accesses, with the guest
> remaining blissfully unaware.
> 
> [...]

Applied to next, thanks!

[1/2] KVM: arm64: gic: Enable GICv3 CPUIF trapping on GICv5 hosts if required
      commit: da63758c1876d899031066a9d4b8050af767ceb8
[2/2] KVM: arm64: Correct test for ICH_HCR_EL2_TDIR cap for GICv5 hosts
      commit: 28e505d81766dcbe25c60d57ab9fc941cd3d38bf

Cheers,

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