From: Marc Zyngier <maz@kernel.org>
To: kvmarm@lists.linux.dev, kvm@vger.kernel.org,
linux-arm-kernel@lists.infradead.org
Cc: 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 2/5] KVM: arm64: Force trap of GMID_EL1 when the guest doesn't have MTE
Date: Thu, 20 Nov 2025 13:31:59 +0000 [thread overview]
Message-ID: <20251120133202.2037803-3-maz@kernel.org> (raw)
In-Reply-To: <20251120133202.2037803-1-maz@kernel.org>
If our host has MTE, but the guest doesn't, make sure we set HCR_EL2.TID5
to force GMID_EL1 being trapped.
Signed-off-by: Marc Zyngier <maz@kernel.org>
---
arch/arm64/kvm/sys_regs.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/arch/arm64/kvm/sys_regs.c b/arch/arm64/kvm/sys_regs.c
index 84e6f04220589..40f32b017f107 100644
--- a/arch/arm64/kvm/sys_regs.c
+++ b/arch/arm64/kvm/sys_regs.c
@@ -5558,6 +5558,8 @@ static void vcpu_set_hcr(struct kvm_vcpu *vcpu)
if (kvm_has_mte(vcpu->kvm))
vcpu->arch.hcr_el2 |= HCR_ATA;
+ else if (id_aa64pfr1_mte(read_sanitised_ftr_reg(SYS_ID_AA64PFR1_EL1)))
+ vcpu->arch.hcr_el2 |= HCR_TID5;
/*
* In the absence of FGT, we cannot independently trap TLBI
--
2.47.3
next prev parent reply other threads:[~2025-11-20 13:32 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-11-20 13:31 [PATCH 0/5] KVM: arm64: Add support for FEAT_IDST Marc Zyngier
2025-11-20 13:31 ` [PATCH 1/5] KVM: arm64: Add routing/handling for GMID_EL1 Marc Zyngier
2025-11-20 13:31 ` Marc Zyngier [this message]
2025-11-20 14:34 ` [PATCH 2/5] KVM: arm64: Force trap of GMID_EL1 when the guest doesn't have MTE Joey Gouly
2025-11-20 14:51 ` Marc Zyngier
2025-11-20 13:32 ` [PATCH 3/5] KVM: arm64: Add a generic synchronous exception injection primitive Marc Zyngier
2025-11-20 13:32 ` [PATCH 4/5] KVM: arm64: Report optional ID register traps with a 0x18 syndrome Marc Zyngier
2025-11-24 10:41 ` Ben Horgan
2025-11-24 11:48 ` Marc Zyngier
2025-11-20 13:32 ` [PATCH 5/5] KVM: arm64: selftests: Add a test for FEAT_IDST Marc Zyngier
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