From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 82CA0D1D484 for ; Thu, 8 Jan 2026 17:32:50 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Content-Transfer-Encoding: MIME-Version:References:In-Reply-To:Message-ID:Date:Subject:Cc:To:From: Reply-To:Content-Type:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=FwftNRQeJjUI0ZbN3tMvhSxKTUiZnovd3LdICquhFY8=; b=qC75jvmq3LQs7zyhlMFye62bp8 QGzjdXKWKGjh9Fe/Yi2NJglmmDZeNMxIh0bfS8PdvTHgDh2trikQtdhAzlSUXiEaBmcXk3LLEDVaE f8V9E0OQcc2hkXfCNUVJH0RRvFnZVwlKvnLF5in0G3Rra3cI+sb3+TikavSus+nF+j0BYh0MiMEu5 n4z+NNbZzVadRM+UdKH8lCv9phBkALzHuKoCSYWvnJxwPYDzdeBv3SRzll6VaZacl6sxm/GRZi5CB DIS6Xh6tRsmjex6DRMJ25B4AFAYz8spaY2ogDIi4FClJFnkMwuhJ18B3LL7XclGN1LBpbpx9R9yFU jPW1RfQA==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98.2 #2 (Red Hat Linux)) id 1vdtsK-00000000PUD-4Aep; Thu, 08 Jan 2026 17:32:44 +0000 Received: from sea.source.kernel.org ([2600:3c0a:e001:78e:0:1991:8:25]) by bombadil.infradead.org with esmtps (Exim 4.98.2 #2 (Red Hat Linux)) id 1vdtsG-00000000PP4-1aIx for linux-arm-kernel@lists.infradead.org; Thu, 08 Jan 2026 17:32:42 +0000 Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by sea.source.kernel.org (Postfix) with ESMTP id C871944382; Thu, 8 Jan 2026 17:32:39 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 98A6DC19423; Thu, 8 Jan 2026 17:32:39 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1767893559; bh=Xj44DQdqV1S1FH+CaQ8UHzwqnVw9PNPNWxqnBoyEVeg=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=MVUsMFRYkph+uER7WXoXMczyseLyTDVw8fPZ9MRccIFRoQ23E2SfziK2peQDgNUv8 s7dyFi2m1SzJAE2nuk3pAVssSH/99yGWYZCn9OMcVCJtcXYWmXLO0jDlACSN9tHMK+ //iUYbgIDJsJJTl5hp7td1HvsH5McM/QL30I9tTiw2BdHmXuSIIH2XdHt9MQnRyvQs ACETvTRGZPeMPKrfT4YH7NSh3wX6NEaaYyLgapkldMlI9wZKmPuE44iOSoKHE2vdjU NRCi9LG7VFHIQNiZ20jvNrnJqVgZtMDIDiZ+8kp+4Z+MIk86uRnGXz/8rX2MYTb1Ro fRmTpTbp1L4og== 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 1vdtsD-00000000W9F-2zKy; Thu, 08 Jan 2026 17:32:37 +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 v4 6/9] KVM: arm64: Force trap of GMID_EL1 when the guest doesn't have MTE Date: Thu, 8 Jan 2026 17:32:30 +0000 Message-ID: <20260108173233.2911955-7-maz@kernel.org> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20260108173233.2911955-1-maz@kernel.org> References: <20260108173233.2911955-1-maz@kernel.org> 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 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260108_093240_435995_430B2FAE X-CRM114-Status: GOOD ( 10.79 ) 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 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 Reviewed-by: Yuan Yao 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 a2b14ca2a702b..3de206b494849 100644 --- a/arch/arm64/kvm/sys_regs.c +++ b/arch/arm64/kvm/sys_regs.c @@ -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 -- 2.47.3