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KVM: arm64: Force trap of GMID_EL1 when the guest doesn't have MTE

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If our host has MTE, but the guest doesn't, make sure we set HCR_EL2.TID5
to force GMID_EL1 being trapped. Such trap will be handled by the
FEAT_IDST handling.

Reviewed-by: Joey Gouly <joey.gouly@arm.com>
Reviewed-by: Yuan Yao <yaoyuan@linux.alibaba.com>
Link: https://patch.msgid.link/20260108173233.2911955-7-maz@kernel.org
Signed-off-by: Marc Zyngier <maz@kernel.org>
This commit is contained in:
Marc Zyngier 2026-01-08 17:32:30 +00:00
parent f07ef1bef6
commit 70a5ce4efc
1 changed files with 2 additions and 0 deletions
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2
arch/arm64/kvm/sys_regs.c
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@ -5576,6 +5576,8 @@ static void vcpu_set_hcr(struct kvm_vcpu *vcpu)
if (kvm_has_mte(vcpu->kvm))
vcpu->arch.hcr_el2 |= HCR_ATA;
else
vcpu->arch.hcr_el2 |= HCR_TID5;
/*
* In the absence of FGT, we cannot independently trap TLBI