From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 8257A337BA3; Thu, 4 Dec 2025 09:48:37 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1764841717; cv=none; b=DtahqzzMcM9EBcnaNVyXqvrynIHddtFGq7SrMs98C46fXPTzydOFo12ZaVUozx9bm4omekFLDOzXlDmLfv0M6VJqycSwndnVxOMzMhrXRNODv//tFXz794pWAuuCQfOn5naPPWoiNjteBiwZny31W/lG1PdzGnCIO7afACVUX18= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1764841717; c=relaxed/simple; bh=ZNBR/fm3XY6TFtf3KXZjf2qzVbXXjNo0ipwm39p6iv0=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=iKzo26juVswWgKujB5pFhHEeKfgvPUQxxNJANIQ9aDuXETt+Y2DYBCCYoa6MMAD0FPr31qBI0xpjddwxdY+2SCvxDqPqYdUScKM51ORUNr410T7SNN9LK4KWnQHJCPhVCuRQXSJM0I+wqJ/PkMFnUZmaJnm3zSC1OtzXUcRl0UU= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=dRsmK5nK; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="dRsmK5nK" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 5C0A0C113D0; Thu, 4 Dec 2025 09:48:37 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1764841717; bh=ZNBR/fm3XY6TFtf3KXZjf2qzVbXXjNo0ipwm39p6iv0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=dRsmK5nKo5kGkySQEKujBf2koyzXM5RMpczZkILyUJjWp9moVcP/Vc9V3yTua9wWV SFbG6HfFqmGCfjfvcdxFOL+UlISZHUSQ4PaIORmHydPSLh5NBzvtPmIlBdXG6mZO0t nTYagwyuiI6F6gk88X56CnJ0yPEVtev5dI0dIyjec4V2iyjN8tTZLyBZeNAiGKLR4J Xzc6OIzTK9dJGbCx96TGxjlmr3H1VT2uDMdqlS/qCcqA06vrEjiDJ2UoIsZw+uidVn UEq0aCR6RbTfhSEe84RGLXAUpZiWVUtXrO8kVfig3k/+urQVgXLcTIxO3A8IyyoYit ofWC0XKgvjZPw== Received: from sofa.misterjones.org ([185.219.108.64] helo=valley-girl.lan) by disco-boy.misterjones.org with esmtpsa (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.98.2) (envelope-from ) id 1vR5wx-0000000AP90-2661; Thu, 04 Dec 2025 09:48:35 +0000 From: Marc Zyngier To: kvmarm@lists.linux.dev, kvm@vger.kernel.org, linux-arm-kernel@lists.infradead.org Cc: Joey Gouly , Suzuki K Poulose , Oliver Upton , Zenghui Yu , Ben Horgan , Yao Yuan Subject: [PATCH v3 6/9] KVM: arm64: Force trap of GMID_EL1 when the guest doesn't have MTE Date: Thu, 4 Dec 2025 09:48:03 +0000 Message-ID: <20251204094806.3846619-7-maz@kernel.org> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20251204094806.3846619-1-maz@kernel.org> References: <20251204094806.3846619-1-maz@kernel.org> Precedence: bulk X-Mailing-List: kvm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-SA-Exim-Connect-IP: 185.219.108.64 X-SA-Exim-Rcpt-To: kvmarm@lists.linux.dev, kvm@vger.kernel.org, linux-arm-kernel@lists.infradead.org, joey.gouly@arm.com, suzuki.poulose@arm.com, oupton@kernel.org, yuzenghui@huawei.com, ben.horgan@arm.com, yaoyuan@linux.alibaba.com X-SA-Exim-Mail-From: maz@kernel.org X-SA-Exim-Scanned: No (on disco-boy.misterjones.org); SAEximRunCond expanded to false 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 Signed-off-by: Marc Zyngier --- 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 ae1e72df1ed45..2e94c423594eb 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 + vcpu->arch.hcr_el2 |= HCR_TID5; /* * In the absence of FGT, we cannot independently trap TLBI -- 2.47.3