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Mon, 10 Nov 2025 05:45:32 -0800 (PST) Date: Mon, 10 Nov 2025 13:45:23 +0000 In-Reply-To: <20251110134525.3768197-1-tabba@google.com> Mime-Version: 1.0 References: <20251110134525.3768197-1-tabba@google.com> X-Mailer: git-send-email 2.51.2.1041.gc1ab5b90ca-goog Message-ID: <20251110134525.3768197-7-tabba@google.com> Subject: [PATCH v3 6/8] KVM: arm64: Do not allow KVM_CAP_ARM_MTE for any guest in pKVM From: Fuad Tabba To: kvmarm@lists.linux.dev, linux-arm-kernel@lists.infradead.org Cc: maz@kernel.org, oliver.upton@linux.dev, will@kernel.org, joey.gouly@arm.com, suzuki.poulose@arm.com, yuzenghui@huawei.com, catalin.marinas@arm.com, vladimir.murzin@arm.com, tabba@google.com Content-Type: text/plain; charset="UTF-8" X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20251110_054534_282071_C3FBF5BA X-CRM114-Status: GOOD ( 11.01 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org 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 all VM types in protected mode. Signed-off-by: Fuad Tabba --- arch/arm64/include/asm/kvm_pkvm.h | 3 +++ 1 file changed, 3 insertions(+) diff --git a/arch/arm64/include/asm/kvm_pkvm.h b/arch/arm64/include/asm/kvm_pkvm.h index 7195be508d99..ea5d2275d16d 100644 --- a/arch/arm64/include/asm/kvm_pkvm.h +++ b/arch/arm64/include/asm/kvm_pkvm.h @@ -44,6 +44,9 @@ 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: + /* Memory tagging is not supported at all in pKVM. */ + return false; default: return !kvm || !kvm_vm_is_protected(kvm); } -- 2.51.2.1041.gc1ab5b90ca-goog