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 65A2A606A33D for ; Fri, 13 Nov 2026 14:50:57 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.a=rsa-sha256 header.s=bombadil.20210309 header.b=CPy3l3VA; dkim=pass (1024-bit key) header.d=arm.com header.i=@arm.com header.a=rsa-sha256 header.s=foss header.b=WW3kvaeG 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=1sqIuqvMzVFwYcFFuvB/apl5px1GCvknNh/xIFDj1SY=; b=CPy3l3VAU/KSX6 Tnv9xCdpZoFDZzzdFdRBoqDyRAxxv2eUsXWOeG+dkTSdq4TnPCme8h7i9RZGoa7KYLWkwdfu8rKyd HaPk3DVJXM6S2JBwt49Y/h0pWfdcFXXIgmlKX4GCcbRnSmwSlC0ah7aMvIehm+dOj0l2ClEfbcIKr E+aDzMyLBnpFjdanzXTUi5wIpYi/McPpMNBkq8bCNST81F42Pie5W5MbEc/K+hi74wz1im2EIGlgi ZC3R/DanVf9ZIQ37zs9C/kaM0nlYfASuQ1zjDUYqbvQeTQ5qt1osJeVUH299vBir908gSBmd1kc8x Hg8zmi3bstN5PsVgOKjg==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.100.1 #2 (Red Hat Linux)) id 1xRsc7-0000000DEAt-1GlG; Fri, 13 Nov 2026 14:50:51 +0000 Received: from foss.arm.com ([217.140.110.172]) by bombadil.infradead.org with esmtp (Exim 4.100.1 #2 (Red Hat Linux)) id 1xRsc0-0000000DE5G-1DN4 for linux-arm-kernel@lists.infradead.org; Fri, 13 Nov 2026 14:50:45 +0000 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 6493C152B; Fri, 13 Nov 2026 06:50:38 -0800 (PST) Received: from e144440.cambridge.arm.com (e144440.arm.com [10.2.199.104]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 1E4B73F673; Fri, 13 Nov 2026 06:50:39 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=arm.com; s=foss; t=1794581441; bh=9SQUwLMIpYjcJX0oV2YKzFqBcvrlXidnGf8kMaWOSRA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=WW3kvaeG9n4NBPABbem1UbMv99+oSVaMw1U5+oBv4pPoupwTYXe4OMAfkgLFyHtVN GMCpq55Y+7ITdds5C+fDgP25eWxbVe0cI9jU1dh8LTjbZjt+rTmIJpiWLr5UvLYq/K FA1QCBM924D3Nf9NnWkqCzQD1gQPXaZba0GJw8zU= From: Ryan Roberts To: Catalin Marinas , Will Deacon , Mark Rutland , Linu Cherian Cc: Ryan Roberts , linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, stable@vger.kernel.org Subject: [PATCH v1 2/6] arm64: cpufeature: Remove Cortex-X4 from the BBML3 allow list Date: Fri, 13 Nov 2026 14:50:16 +0000 Message-ID: <20261113145022.2592454-3-ryan.roberts@arm.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20261113145022.2592454-1-ryan.roberts@arm.com> References: <20261113145022.2592454-1-ryan.roberts@arm.com> X-Archived-By: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20261113_065044_389823_B34D1F19 X-CRM114-Status: GOOD ( 10.93 ) X-Spam-Score: -4.4 (----) 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=-18.9 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 Cortex-X4 erratum 3043263 can cause a load or store to livelock when mapping size changes without break-before-make or when contiguous hints are programmed inconsistently. The erratum was previously reported as fixed in r0p3. On that basis, commit 5aa4b625762e ("arm64: Add BBM Level 2 cpu feature") added Cortex-X4 from r0p3. The updated Cortex-X4 SDEN v13, dated 18 June 2026, lists r0p0, r0p1, r0p2 and r0p3 as affected and the erratum as open. Remove the entry so Cortex-X4 observes break-before-make, and record the workaround in the silicon errata registry. Cc: stable@vger.kernel.org Link: https://support.arm.com/documentation/109148/13-0/?lang=en Signed-off-by: Ryan Roberts --- Documentation/arch/arm64/silicon-errata.rst | 2 ++ arch/arm64/kernel/cpufeature.c | 1 - 2 files changed, 2 insertions(+), 1 deletion(-) diff --git a/Documentation/arch/arm64/silicon-errata.rst b/Documentation/arch/arm64/silicon-errata.rst index 9ad965d3e1ea..9d6d13045a55 100644 --- a/Documentation/arch/arm64/silicon-errata.rst +++ b/Documentation/arch/arm64/silicon-errata.rst @@ -201,6 +201,8 @@ stable kernels. +----------------+-----------------+-----------------+-----------------------------+ | ARM | Cortex-X3 | #4193786 | ARM64_ERRATUM_4118414 | +----------------+-----------------+-----------------+-----------------------------+ +| ARM | Cortex-X4 | #3043263 | N/A | ++----------------+-----------------+-----------------+-----------------------------+ | ARM | Cortex-X4 | #3194386 | ARM64_ERRATUM_3194386 | +----------------+-----------------+-----------------+-----------------------------+ | ARM | Cortex-X4 | #4118414 | ARM64_ERRATUM_4118414 | diff --git a/arch/arm64/kernel/cpufeature.c b/arch/arm64/kernel/cpufeature.c index b15619690f42..8819652a67ed 100644 --- a/arch/arm64/kernel/cpufeature.c +++ b/arch/arm64/kernel/cpufeature.c @@ -2011,7 +2011,6 @@ bool cpu_supports_bbml3(void) { /* CPUs that support BBML3 but dont advertise through ID_AA64MMFR2_EL1 */ static const struct midr_range supports_bbml3_list[] = { - MIDR_REV_RANGE(MIDR_CORTEX_X4, 0, 3, 0xf), MIDR_ALL_VERSIONS(MIDR_NVIDIA_OLYMPUS), MIDR_ALL_VERSIONS(MIDR_NVIDIA_RIGEL), MIDR_ALL_VERSIONS(MIDR_AMPERE1), -- 2.43.0