From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (prime256v1) server-digest SHA256) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id A2717606A31A for ; Mon, 26 Oct 2026 08:23:19 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key, unprotected) header.d=lists.infradead.org header.i=@lists.infradead.org header.a=rsa-sha256 header.s=bombadil.20210309 header.b=pX3pJuhl; dkim=pass (2048-bit key, unprotected) header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=k20260515 header.b=D0mujMOQ 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-Unsubscribe-Post: List-Owner; bh=iaCdCVyt1C7egWZ6jI8Y0J3eVgASMFjDhFgq4khrhao=; b=pX3pJuhlIq8cV6 a6gA4wra8lsfFY/hV+gBAlZFVYv8sYZDGZWuTrkbzjoWNBx7EvmXCJ3NXhHiDriE5i1iS1UQAKi7P ru9tvB63N4LoFYFkNJbEuMlurBdjKsQfVifWg/U7O2IQPYj2hk0ibBBklObIMT+cKQt5/XrlCb1p5 JkCzi4GWVqxXfE3eYiiryrC9Nq2abF0lRzVbgrrmN49LsH2S/NQYxGJlbfXSrMvQrNSOjWLY4OqAX GFFM+/IRihCqlLw7FsrnMJWo/njeM4d+r8DS2/FYBZcdL1AYMY/1gg/OuCE6vZ/egomA6ZQuNC/wm DoT0Gys37tsMiK8BQ9bg==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.100.1 #2 (Red Hat Linux)) id 1xLFz7-00000001wVu-2vCP; Mon, 26 Oct 2026 08:23:13 +0000 Received: from sea.source.kernel.org ([172.234.252.31]) by bombadil.infradead.org with esmtps (Exim 4.100.1 #2 (Red Hat Linux)) id 1xLFz5-00000001wVd-3B7m for linux-arm-kernel@lists.infradead.org; Mon, 26 Oct 2026 08:23:11 +0000 Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) by sea.source.kernel.org (Postfix) with ESMTP id 3C27642DB1; Mon, 26 Oct 2026 08:23:11 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 1496A1F031E2; Mon, 26 Oct 2026 08:23:11 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1793002991; bh=iaCdCVyt1C7egWZ6jI8Y0J3eVgASMFjDhFgq4khrhao=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=D0mujMOQvxaakhh5DiXKDIQkG60Tnho4R78TJjGDJj/hVjKK6za+eim4Yz1RQ1306 N0bUuIm3HpxA3AkavvniuvVNgJHF3X5tgGL1/78fVzXU49yVURcdoM7Cm+5v7TtEY9 Ayx5V+3duCxEXAxyPhPeQaPN482cTXsRMPMsh0YkCDbi42/uTIjqf73r6cOdF+AzaN OAUdaTtO/5jdCOJdoDCuitb/5xTcCOjQ9aWojn9NYzhU87i4JDzbLLShWa9eyluGxS 9JRV5ZPzd/aWptPW9jrXPzqEMUSV12ALQDwwoja30ilmw8S/z+0saz0aX6aV8bZisW Pr0qEeUAhilGw== 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 1xLFz3-00000007A40-1Ich; Mon, 26 Oct 2026 08:23:09 +0000 From: Marc Zyngier To: kvmarm@lists.linux.dev, linux-arm-kernel@lists.infradead.org Cc: Steffen Eiden , Joey Gouly , Suzuki K Poulose , Oliver Upton , Zenghui Yu , Fuad Tabba , Catalin Marinas , Will Deacon , Mark Rutland Subject: [PATCH 2/2] KVM: arm64: Reenable MTE tag checking on exit from guest when running VHE Date: Mon, 26 Oct 2026 08:23:05 +0000 Message-ID: <20261026082305.2515705-3-maz@kernel.org> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20261026082305.2515705-1-maz@kernel.org> References: <20261026082305.2515705-1-maz@kernel.org> X-Archived-By: 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, linux-arm-kernel@lists.infradead.org, seiden@linux.ibm.com, joey.gouly@arm.com, suzuki.poulose@arm.com, oupton@kernel.org, yuzenghui@huawei.com, fuad.tabba@linux.dev, catalin.marinas@arm.com, will@kernel.org, mark.rutland@arm.com X-SA-Exim-Mail-From: maz@kernel.org X-SA-Exim-Scanned: No (on disco-boy.misterjones.org); SAEximRunCond expanded to false X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" X-Spam-Status: No, score=-19.2 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=ham autolearn_force=no version=4.0.1 X-Spam-Checker-Version: SpamAssassin 4.0.1 (2024-03-26) on aws-us-west-2-korg-listserv-alma10-1 Once we're back from running a guest, it is important to set TCO to zero so that MTE is functional again. Signed-off-by: Marc Zyngier --- arch/arm64/kvm/hyp/vhe/switch.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/arch/arm64/kvm/hyp/vhe/switch.c b/arch/arm64/kvm/hyp/vhe/switch.c index 4c965f9b1e1de..73c2dd61e6c69 100644 --- a/arch/arm64/kvm/hyp/vhe/switch.c +++ b/arch/arm64/kvm/hyp/vhe/switch.c @@ -193,6 +193,13 @@ static void __deactivate_traps(struct kvm_vcpu *vcpu) if (!arm64_kernel_unmapped_at_el0()) host_vectors = __this_cpu_read(this_cpu_vector); write_sysreg(host_vectors, vbar_el1); + + /* + * We're now able to take MTE exceptions, make sure the VBAR_EL2 is + * set to the correct value. + */ + if (mte_disable_tco_entry(current)) + isb(); } NOKPROBE_SYMBOL(__deactivate_traps); -- 2.47.3