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From: Aneesh Kumar K.V <aneesh.kumar@kernel.org>
To: Steven Price <steven.price@arm.com>, kvm@vger.kernel.org,
	kvmarm@lists.linux.dev
Cc: Steven Price <steven.price@arm.com>,
	Catalin Marinas <catalin.marinas@arm.com>,
	Marc Zyngier <maz@kernel.org>, Will Deacon <will@kernel.org>,
	James Morse <james.morse@arm.com>,
	Oliver Upton <oliver.upton@linux.dev>,
	Suzuki K Poulose <suzuki.poulose@arm.com>,
	Zenghui Yu <yuzenghui@huawei.com>,
	linux-arm-kernel@lists.infradead.org,
	linux-kernel@vger.kernel.org, Joey Gouly <joey.gouly@arm.com>,
	Alexandru Elisei <alexandru.elisei@arm.com>,
	Christoffer Dall <christoffer.dall@arm.com>,
	Fuad Tabba <tabba@google.com>, linux-coco@lists.linux.dev,
	Ganapatrao Kulkarni <gankulkarni@os.amperecomputing.com>,
	Gavin Shan <gshan@redhat.com>,
	Shanker Donthineni <sdonthineni@nvidia.com>,
	Alper Gun <alpergun@google.com>,
	Emi Kisanuki <fj0570is@fujitsu.com>,
	Vishal Annapurve <vannapurve@google.com>, WeiLin.Chang@arm.com,
	Lorenzo.Pieralisi2@arm.com
Subject: Re: [PATCH v14 17/44] arm64: RMI: RTT tear down
In-Reply-To: <20260513131757.116630-18-steven.price@arm.com>
References: <20260513131757.116630-1-steven.price@arm.com>
 <20260513131757.116630-18-steven.price@arm.com>
Date: Tue, 19 May 2026 12:24:26 +0530
Message-ID: <yq5a1pf7ubx9.fsf@kernel.org>
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Steven Price <steven.price@arm.com> writes:
> +static void kvm_realm_uninit_stage2(struct kvm_s2_mmu *mmu)
> +{
> +	struct kvm *kvm = kvm_s2_mmu_to_kvm(mmu);
> +	struct realm *realm = &kvm->arch.realm;
> +
> +	if (kvm_realm_state(kvm) != REALM_STATE_ACTIVE)
> +		return;
> +
> +	write_lock(&kvm->mmu_lock);
> +	kvm_stage2_unmap_range(mmu, 0, BIT(realm->ia_bits - 1), true);
> +	write_unlock(&kvm->mmu_lock);
> +	kvm_realm_destroy_rtts(kvm);
> +}
> +

We also call kvm_stage2_unmap_range in kvm_destroy_realm()

void kvm_destroy_realm(struct kvm *kvm)
{
...
	write_lock(&kvm->mmu_lock);
	kvm_stage2_unmap_range(&kvm->arch.mmu, 0,
			       BIT(realm->ia_bits - 1), true);
	write_unlock(&kvm->mmu_lock);
        
-aneesh