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KVM: arm64: Do not allow KVM_CAP_ARM_MTE for any guest in pKVM

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Supporting MTE in pKVM introduces significant complexity to the
hypervisor at EL2, even for non-protected VMs, since it would require
EL2 to handle tag management.

For now, do not allow KVM_CAP_ARM_MTE for any VM type in protected mode.

Signed-off-by: Fuad Tabba <tabba@google.com>
Link: https://patch.msgid.link/20251211104710.151771-7-tabba@google.com
Signed-off-by: Marc Zyngier <maz@kernel.org>
This commit is contained in:
Fuad Tabba 2025-12-11 10:47:06 +00:00 committed by Marc Zyngier
parent 43a21a0f0c
commit f4eee308c8
1 changed files with 2 additions and 0 deletions
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2
arch/arm64/include/asm/kvm_pkvm.h
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@ -44,6 +44,8 @@ static inline bool kvm_pkvm_ext_allowed(struct kvm *kvm, long ext)
case KVM_CAP_ARM_PTRAUTH_ADDRESS:
case KVM_CAP_ARM_PTRAUTH_GENERIC:
return true;
case KVM_CAP_ARM_MTE:
return false;
default:
return !kvm || !kvm_vm_is_protected(kvm);
}