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 CE35C2DB7B6; Thu, 8 Jan 2026 17:32:39 +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=1767893559; cv=none; b=sLLw2Ennlkw8uTYzY6uKV3aGgtFHLSWOwlyTZg3dNwCrZy7dRphcWnN/csv49GU2GdB30Fade/ZwHV6JNWHP4nXOm509A+73fj737kq0snb40a5ZvjasxYQM0K/PsWjttqtRNwRZxdgUM2qtzZARCHSORyEgzyxK+MNpy7kOsWM= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1767893559; c=relaxed/simple; bh=Xj44DQdqV1S1FH+CaQ8UHzwqnVw9PNPNWxqnBoyEVeg=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=C/+gHb+yOV6tlT9Q1erUXc30szxhLU2rdDwsVroRDeV8zM0NmL2hpdBcFKLyXIS8Ptgsu503sDvSDZC4BBQ9hY/MqxRhuZgV4qpFr2UmrRttdgtSW6e/G2ENf11VdZs51ejEnIqrg3+20eBPeAnmHEg7SzjdUVAjFqd0TrK78AU= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=MVUsMFRY; 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="MVUsMFRY" 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> Precedence: bulk X-Mailing-List: kvmarm@lists.linux.dev 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 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