From nobody Tue Nov 26 04:43:48 2024 Received: from mgamail.intel.com (mgamail.intel.com [198.175.65.12]) (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 16F09323D; Tue, 22 Oct 2024 00:17:36 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=198.175.65.12 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1729556258; cv=none; b=drYxmgLWhiAzjt8ISboZJBDES0Z0nw9y6+EZJDg1W3IKxRpdPLW780GnkQKeieOfFztM/UBIuD2tNpCCgFNZ9rI7qkzT7GWgfoIgEJQC/MANQG9hNvE/gZU+onZ0x1pj3AJgeT+bm63NWeVfDyizjxgzn25y8choM6xmSb0SNM4= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1729556258; c=relaxed/simple; bh=8foRClbi0ov1PrOIWtTzAzLs+dOjfgrS1ihOVOBOuKM=; h=From:To:Cc:Subject:Date:Message-Id:MIME-Version; b=QFSYl9XpwUhA7PMqu30tpX802c3ab2zoIK3iuAeoM+c94YebWppKvBckdkjrLFRTatXzt1OMnVyEpDNTUXMomKs6aK9jBV4n7bmtWn2RMIKRTUMx3h8Gp+DsfKxk0UoKYqkvVa0C+iMyOg7DPEaiKzNRvQumnLiQq5QnTZyU3fc= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=intel.com; spf=pass smtp.mailfrom=intel.com; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b=H9x6GQ5T; arc=none smtp.client-ip=198.175.65.12 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=intel.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=intel.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b="H9x6GQ5T" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1729556257; x=1761092257; h=from:to:cc:subject:date:message-id:mime-version: content-transfer-encoding; bh=8foRClbi0ov1PrOIWtTzAzLs+dOjfgrS1ihOVOBOuKM=; b=H9x6GQ5TKyypsNGi40PAlUvHuY9isUDPpcjR1YUfS89BtOftPaGO1AqD kaBxfWEQztzA6YfqzpFqFL/QIiYlSodf0Rvj5Z3sFxvEP+ljnZJqUC+zq Gt64srxithH8I2H2I/BrdfMkQ1FnpMBlaucnf2s1Lg33Nn17/O68R6ECv gu2lSgdgEHi7L95TdgSKDHg0rXvDX5aSmSonHnb/hLiGraKoby9xVfSGf ywgZ1vqb2T9YDQBqkeiOSsLRIqeVfyaUB4Tep36BWaHVmyIxqzYux6nWF kTacFlL/DXcahN8FdM64UllskuVGWCstDwhvQEbhWZxyejX6xS+iKRj18 w==; X-CSE-ConnectionGUID: Bs0WXJWdRAmO9ebABBMffQ== X-CSE-MsgGUID: cszAtTfxQGiTv56ktLxEmw== X-IronPort-AV: E=McAfee;i="6700,10204,11232"; a="40454332" X-IronPort-AV: E=Sophos;i="6.11,221,1725346800"; d="scan'208";a="40454332" Received: from orviesa002.jf.intel.com ([10.64.159.142]) by orvoesa104.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 21 Oct 2024 17:17:36 -0700 X-CSE-ConnectionGUID: TFyYhElHSGKAmhjR7QALnw== X-CSE-MsgGUID: n0VVFdrdRYWs1zDR7t2CCg== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.11,221,1725346800"; d="scan'208";a="110514238" Received: from rzhang1-mobl7.sh.intel.com ([10.238.6.124]) by orviesa002-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 21 Oct 2024 17:17:31 -0700 From: Zhang Rui To: rafael@kernel.org, lenb@kernel.org, tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, dave.hansen@linux.intel.com, x86@kernel.org Cc: rui.zhang@intel.com, linux-acpi@vger.kernel.org, linux-kernel@vger.kernel.org, jmattson@google.com Subject: [PATCH] x86/acpi: Fix LAPIC/x2APIC parsing order Date: Tue, 22 Oct 2024 08:17:12 +0800 Message-Id: <20241022001712.9218-1-rui.zhang@intel.com> X-Mailer: git-send-email 2.34.1 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" On some systems, the same CPU (with the same APIC ID) is assigned a different logical CPU id after commit ec9aedb2aa1a ("x86/acpi: Ignore invalid x2APIC entries"). This means that Linux enumerates the CPUs in a different order, which violates ACPI specification[1] that states: "OSPM should initialize processors in the order that they appear in the MADT" The problematic commit parses all LAPIC entries before any x2APIC entries, aiming to ignore x2APIC entries with APIC ID < 255 when valid LAPIC entries exist. However, it disrupts the CPU enumeration order on systems where x2APIC entries precede LAPIC entries in the MADT. Fix the problem by separately checking LAPIC entries before parsing any LAPIC or x2APIC entries. 1. https://uefi.org/specs/ACPI/6.5/05_ACPI_Software_Programming_Model.html#= madt-processor-local-apic-sapic-structure-entry-order Cc: stable@vger.kernel.org Reported-by: Jim Mattson Closes: https://lore.kernel.org/all/20241010213136.668672-1-jmattson@google= .com/ Fixes: ec9aedb2aa1a ("x86/acpi: Ignore invalid x2APIC entries") Signed-off-by: Zhang Rui Reviewed-by: Jim Mattson Tested-by: Jim Mattson --- arch/x86/kernel/acpi/boot.c | 50 +++++++++++++++++++++++++++++++++---- 1 file changed, 45 insertions(+), 5 deletions(-) diff --git a/arch/x86/kernel/acpi/boot.c b/arch/x86/kernel/acpi/boot.c index 4efecac49863..c70b86f1f295 100644 --- a/arch/x86/kernel/acpi/boot.c +++ b/arch/x86/kernel/acpi/boot.c @@ -226,6 +226,28 @@ acpi_parse_x2apic(union acpi_subtable_headers *header,= const unsigned long end) return 0; } =20 +static int __init +acpi_check_lapic(union acpi_subtable_headers *header, const unsigned long = end) +{ + struct acpi_madt_local_apic *processor =3D NULL; + + processor =3D (struct acpi_madt_local_apic *)header; + + if (BAD_MADT_ENTRY(processor, end)) + return -EINVAL; + + /* Ignore invalid ID */ + if (processor->id =3D=3D 0xff) + return 0; + + /* Ignore processors that can not be onlined */ + if (!acpi_is_processor_usable(processor->lapic_flags)) + return 0; + + has_lapic_cpus =3D true; + return 0; +} + static int __init acpi_parse_lapic(union acpi_subtable_headers * header, const unsigned long= end) { @@ -257,7 +279,6 @@ acpi_parse_lapic(union acpi_subtable_headers * header, = const unsigned long end) processor->processor_id, /* ACPI ID */ processor->lapic_flags & ACPI_MADT_ENABLED); =20 - has_lapic_cpus =3D true; return 0; } =20 @@ -1029,6 +1050,8 @@ static int __init early_acpi_parse_madt_lapic_addr_ov= r(void) static int __init acpi_parse_madt_lapic_entries(void) { int count, x2count =3D 0; + struct acpi_subtable_proc madt_proc[2]; + int ret; =20 if (!boot_cpu_has(X86_FEATURE_APIC)) return -ENODEV; @@ -1037,10 +1060,27 @@ static int __init acpi_parse_madt_lapic_entries(voi= d) acpi_parse_sapic, MAX_LOCAL_APIC); =20 if (!count) { - count =3D acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_APIC, - acpi_parse_lapic, MAX_LOCAL_APIC); - x2count =3D acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_X2APIC, - acpi_parse_x2apic, MAX_LOCAL_APIC); + /* Check if there are valid LAPIC entries */ + acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_APIC, acpi_check_lapic, MAX_L= OCAL_APIC); + + /* + * Enumerate the APIC IDs in the order that they appear in the + * MADT, no matter LAPIC entry or x2APIC entry is used. + */ + memset(madt_proc, 0, sizeof(madt_proc)); + madt_proc[0].id =3D ACPI_MADT_TYPE_LOCAL_APIC; + madt_proc[0].handler =3D acpi_parse_lapic; + madt_proc[1].id =3D ACPI_MADT_TYPE_LOCAL_X2APIC; + madt_proc[1].handler =3D acpi_parse_x2apic; + ret =3D acpi_table_parse_entries_array(ACPI_SIG_MADT, + sizeof(struct acpi_table_madt), + madt_proc, ARRAY_SIZE(madt_proc), MAX_LOCAL_APIC); + if (ret < 0) { + pr_err("Error parsing LAPIC/X2APIC entries\n"); + return ret; + } + count =3D madt_proc[0].count; + x2count =3D madt_proc[1].count; } if (!count && !x2count) { pr_err("No LAPIC entries present\n"); --=20 2.34.1