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From: Marc Zyngier <maz@kernel.org>
To: kvmarm@lists.linux.dev, linux-arm-kernel@lists.infradead.org,
	kvm@vger.kernel.org
Cc: Steffen Eiden <seiden@linux.ibm.com>,
	Joey Gouly <joey.gouly@arm.com>,
	Suzuki K Poulose <suzuki.poulose@arm.com>,
	Oliver Upton <oupton@kernel.org>,
	Zenghui Yu <yuzenghui@huawei.com>
Subject: [PATCH 1/3] KVM: arm64: Key CPTR_EL2.E0POE propagation on FEAT_S1POE
Date: Tue,  2 Jun 2026 16:54:27 +0100	[thread overview]
Message-ID: <20260602155430.2088142-2-maz@kernel.org> (raw)
In-Reply-To: <20260602155430.2088142-1-maz@kernel.org>

We propagate CPTR_EL2.E0POE from a L1 into the L0 configuration, but
we key this on the L1 guest supporting FEAT_S2POE. This is obviously
wrong, as this bit is solely concerned with Stage-1 translation.

Fix this by making the update depend on FEAT_S1POE.

Fixes: cd931bd6093cb ("KVM: arm64: nv: Add additional trap setup for CPTR_EL2")
Signed-off-by: Marc Zyngier <maz@kernel.org>
---
 arch/arm64/kvm/hyp/include/hyp/switch.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/arm64/kvm/hyp/include/hyp/switch.h b/arch/arm64/kvm/hyp/include/hyp/switch.h
index bf0eb5e434274..161bb2a3e1d90 100644
--- a/arch/arm64/kvm/hyp/include/hyp/switch.h
+++ b/arch/arm64/kvm/hyp/include/hyp/switch.h
@@ -141,7 +141,7 @@ static inline void __activate_cptr_traps_vhe(struct kvm_vcpu *vcpu)
 	if (!(SYS_FIELD_GET(CPACR_EL1, ZEN, cptr) & BIT(0)))
 		val &= ~CPACR_EL1_ZEN;
 
-	if (kvm_has_feat(vcpu->kvm, ID_AA64MMFR3_EL1, S2POE, IMP))
+	if (kvm_has_feat(vcpu->kvm, ID_AA64MMFR3_EL1, S1POE, IMP))
 		val |= cptr & CPACR_EL1_E0POE;
 
 	val |= cptr & CPTR_EL2_TCPAC;
-- 
2.47.3



  reply	other threads:[~2026-06-02 15:54 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2026-06-02 15:54 [PATCH 0/3] KVM: arm64: FEAT_{S1POE,ATS1A} support fixes Marc Zyngier
2026-06-02 15:54 ` Marc Zyngier [this message]
2026-06-02 15:54 ` [PATCH 2/3] KVM: arm64: Wire AT S1E1A in the system instruction handling table Marc Zyngier
2026-06-02 15:54 ` [PATCH 3/3] arm64: cpufeature: Expose ID_AA64ISAR2_EL1.ATS1A to KVM Marc Zyngier
2026-06-02 17:49 ` [PATCH 0/3] KVM: arm64: FEAT_{S1POE,ATS1A} support fixes Oliver Upton

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