From nobody Sun Feb 8 05:30:04 2026 Received: from mail-wr1-f41.google.com (mail-wr1-f41.google.com [209.85.221.41]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 117AC5B666 for ; Sat, 23 Mar 2024 23:26:26 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.221.41 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1711236388; cv=none; b=aGJ74SXz0AicVu5F5yuMzXvLmoE/BR6L5FcC7RoF40A1ahNDJ3tOwDXN0NcIq2DWBWkv8Vajuk1W/CC/yheowGYhA2iT47/MjeZ/Rt0jtWDUngkiv+Eb3CE2zv+Ypanr2IQ5Oy/6RXumSkK1gg6S/P8/hHGFKG187mmxEVKxgVg= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1711236388; c=relaxed/simple; bh=0FcTEAJ1gsfQH0FOE6VYrEMIelWTsI8PzMeOeA0BcWI=; h=From:To:Cc:Subject:Date:Message-Id; b=HCyzLHsst8bddA6btDA/68KX4hnaN7IiQ4exbvdZ2kTiHGpxR0oAP1J0xfEC10FrtPwRq33pkoUCdMAgLDWrTDFkMjWd1AH1BW1gTxyywGLSIKp2VTQsnodC3T+c+/9YyaAg+Paq6w9qcFbCoheWF+nHq0qEAyc45FzQKCyRkFc= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com; spf=pass smtp.mailfrom=gmail.com; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b=K3Q1CVjn; arc=none smtp.client-ip=209.85.221.41 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gmail.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="K3Q1CVjn" Received: by mail-wr1-f41.google.com with SMTP id ffacd0b85a97d-33e1878e357so1619096f8f.3 for ; Sat, 23 Mar 2024 16:26:26 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1711236385; x=1711841185; darn=vger.kernel.org; h=message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=0B8qywLY2tLet+rlAAUKMoLoXlaF6fUnntCxMPJdL8A=; b=K3Q1CVjnwSF/aA59p1C1oAkMkIAWlavUmHh6YEWkIUYdlCaie6xZynJMk5Cl/CqxOi PoVQZsyrKQemaVjd2v5eMOrvY8Qfi7Tq2+4pVWTiMt19VN7ImP+xoEMoZe7s3bv3lzju 5kAGdJJyBJpTMVrhunL9xVRPb3kRJOTl0AAgilnwT5whg9YWnCcCjnSArrDjJkRKuOhI Fz/35vs7QA5zENeqaj/aZMye/2bV3h61h1KQvvVaoYshxfq9teFog8/qa/gqIYvv3ULK atr3WHXNy6TJC0wjVCHPIpz3gf0cBlizNNgKAUPE522SmNSSAPGpp33cbm6gY2DOGzW0 BmFg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1711236385; x=1711841185; h=message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=0B8qywLY2tLet+rlAAUKMoLoXlaF6fUnntCxMPJdL8A=; b=AdBHGPjgUyMH63Cdur1Y85Vfga0gb90XlFEkftQ9bcmFjgfug+GFdJzk/l1WyjHSSH 1uD7J1OcvHuutj20gSjnYBfrI9tGC8qgitfWbA/+cSvUHHtac9vDHA/P+YY6m3caRer7 OiuMcqxPpVv0QyisHknSU8N5Gu2Phw0Q9qZxsl4lnzzxNSbKLo43bzwMuwtbAXdGq1we 6tUgKulNeFPhi6APmi8DTQ0VOzuhfi6qd7wSD1l5TwnhIQp5WiwWnlt5NZDjTbHfuYl6 MkQnF8px0rIV7j32LDK+UubRyvtQ5BUSwzMexaIkL/1/rtXrG8GF4+5xck1o+S9UrSQj 8Vyw== X-Forwarded-Encrypted: i=1; AJvYcCV8kUDb20OvknbKBYGyiU/oAdf8yvbjwzjWsSjW43zIXspvB1cnpxyTHB/FHc0K8QG4IeOuz4cEEuVS58V3QcljmIWed7CTRFKvxugP X-Gm-Message-State: AOJu0YzjoTFWwl9E65sKmlfcMt8MZsHHSKQzj2aSLwDNHPqIEUm0Tyq0 VF4JnQMN8FrTByuqlI43qF9epDz2IgEht92sRx/FSz/yIVq/IiI6foLM03+4kb8= X-Google-Smtp-Source: AGHT+IHytGJSI01knpRRl4ETirIQM17BjnITmp2pUl7IOWoODsCx/rYUJGEQLZoU9SUxKSNcfZMrtA== X-Received: by 2002:a5d:42c9:0:b0:33e:a0b1:e783 with SMTP id t9-20020a5d42c9000000b0033ea0b1e783mr2218639wrr.22.1711236385118; Sat, 23 Mar 2024 16:26:25 -0700 (PDT) Received: from localhost ([185.92.221.13]) by smtp.gmail.com with ESMTPSA id j26-20020aa7de9a000000b0056c08268768sm169534edv.10.2024.03.23.16.26.24 (version=TLS1_2 cipher=ECDHE-ECDSA-CHACHA20-POLY1305 bits=256/256); Sat, 23 Mar 2024 16:26:24 -0700 (PDT) From: Wei Yang To: tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, dave.hansen@linux.intel.com Cc: x86@kernel.org, linux-kernel@vger.kernel.org, Wei Yang , Vivek Goyal , "Kirill A . Shutemov" , Ingo Molnar , Steve Wahl , Borislav Petkov Subject: [PATCH] x86/head/64: level2_kernel_pgt's kernel area is built with _PAGE_PRESENT set Date: Sat, 23 Mar 2024 23:26:21 +0000 Message-Id: <20240323232621.10400-1-richard.weiyang@gmail.com> X-Mailer: git-send-email 2.11.0 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" The code is first introduced in 'commit 1ab60e0f72f7 ("[PATCH] x86-64: Relocatable Kernel Support")'. Then 'commit c88d71508e36b ("x86/boot/64: Rewrite startup_64() in C")', convert it to c. And 'commit 2aa85f246c181 ("x86/boot/64: Make level2_kernel_pgt pages invalid outside kernel area")' limit the range from _text to _end. Originally, it does the check because the loop iterate the whole level2_kernel_pgt, while currently it just fixup the kernel area. This area is built with _PAGE_PRESENT set. Signed-off-by: Wei Yang CC: Vivek Goyal CC: Kirill A. Shutemov CC: Ingo Molnar CC: Steve Wahl CC: Borislav Petkov --- arch/x86/kernel/head64.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) diff --git a/arch/x86/kernel/head64.c b/arch/x86/kernel/head64.c index 212e8e06aeba..75c69f8620d8 100644 --- a/arch/x86/kernel/head64.c +++ b/arch/x86/kernel/head64.c @@ -253,8 +253,7 @@ unsigned long __head __startup_64(unsigned long physadd= r, =20 /* fixup pages that are part of the kernel image */ for (; i <=3D pmd_index((unsigned long)_end); i++) - if (pmd[i] & _PAGE_PRESENT) - pmd[i] +=3D load_delta; + pmd[i] +=3D load_delta; =20 /* invalidate pages after the kernel image */ for (; i < PTRS_PER_PMD; i++) --=20 2.34.1