From nobody Fri Dec 19 15:16:30 2025 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) (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 57011199EA1 for ; Mon, 26 Aug 2024 20:44:02 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=170.10.133.124 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1724705043; cv=none; b=QAaTmq4oaCRqN/namg4B1VAS4qH7aYJDpw0mvz/trtHYsaTDNneRSJPINBCSZ6QTLV9NLGC1+BiOq3PIm4XuNpO+Weha0G7HZyLZhXaZEOQMsqj+kxu3uGzMhuG3+ywRdmYfARQo5NplWwFb2syUcWV3vcGLD/JcO/uVbY9X3QY= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1724705043; c=relaxed/simple; bh=bqt9KW78i0VdjWfmtysLtEN3zBnedLCNShRvlblkAoU=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=iszhFdfJrp86GDQo6vnyLtbGxXimY988Lm6tzslYc6vJZi9CJ8OveIsUYRNT7dPKDFaM8m+SdY5HuI+ROktwjzOFf/iBROs/zBwgIaOgJPxdKd5fG8TlOPewloAzHfO/ZwviLMwQ0+E2ji0h1Lfz/a77aSHI1CNo2URxSO1BDUI= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=redhat.com; spf=pass smtp.mailfrom=redhat.com; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b=Ar+zbt5o; arc=none smtp.client-ip=170.10.133.124 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=redhat.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=redhat.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="Ar+zbt5o" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1724705041; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=2iIRbDNVyj1lHjlop0tZMw2JlHFFftRtxMxE0Q8z7r8=; b=Ar+zbt5oCah6Qf33SxCiUAvIabyqP86l1dGq0t/zeL1oUHWtfPc5NI/xI5MX6KdMHIXtK8 RXYscjgwNh4EXTAyPiwdnCqtZDP4KMT9lutKDJI/GABRFNGxoFjMHSbmLPKo/8dpFnlsyz Q787vIi9PCkC3nrbB5Watux6GGg2VbE= Received: from mail-oo1-f72.google.com (mail-oo1-f72.google.com [209.85.161.72]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-660-hsTtSPi_N_mF8Kg-yWxfIQ-1; Mon, 26 Aug 2024 16:43:59 -0400 X-MC-Unique: hsTtSPi_N_mF8Kg-yWxfIQ-1 Received: by mail-oo1-f72.google.com with SMTP id 006d021491bc7-5d5ba96af29so6521257eaf.0 for ; Mon, 26 Aug 2024 13:43:59 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1724705038; x=1725309838; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=2iIRbDNVyj1lHjlop0tZMw2JlHFFftRtxMxE0Q8z7r8=; b=UirOOojUR0qxhflKONyvS+1+O+bXOc9wSE1zHcPWBGFI3vRQsEGBR9jYnrpJ9kvwnk mTBzK5Ee7Na0qH7zYtJKk4qiirDDTmq4l3ikyamr+tbRgliWgxtVLgszc23Ntd6JIO2h gYw/uTpuDniJnTai4rN/o5IBnfz6baz9PwYAU3S55nVLeTCwT3idZpEZl+cp4d+n3PpG 2r1cml6WN42OJaD3pXJsUPW8KPnVpLPZwqqrugtaFznu6xe+IsatUtbiYpWJ/0LIIsdx tummxG46kAcHhxnqGfAhS4jJW5WglmM+OOrijUlhfnf9REx83RR8IYRDrgOaNHh9oOtq SxiQ== X-Gm-Message-State: AOJu0Yy/Vz80In756j3uWzuKQgVUWCEEeYHxUuCSWk5A0yteiYP/r6q/ +YNhAPvxXJKFTuv0141qykfl3cHG88uYAON8wNWTFILWHtQ4WltChNYn3yV0pcEqffPiCxj2dsY vaFBMLJTlsrauq6jDR2dSzpk2U2XBpT7oXVV1drhruPTuDSC7XcSgXzXyMYVQLShB2uLbUfjG1W AMRcHJFgPiqcRnTtqVTf3HSWIAn7XAA/fwZqWdgnIpmlI= X-Received: by 2002:a05:6358:52ca:b0:1b5:a032:9994 with SMTP id e5c5f4694b2df-1b5ebe5b1b3mr113537455d.0.1724705038510; Mon, 26 Aug 2024 13:43:58 -0700 (PDT) X-Google-Smtp-Source: AGHT+IHkrFRhmUpfOOmJ2YwtqClR5K8A29/GQ8sXabHeZ52sv0b77XENUJCQ9LJLwxTjS7HZUYg0sQ== X-Received: by 2002:a05:6358:52ca:b0:1b5:a032:9994 with SMTP id e5c5f4694b2df-1b5ebe5b1b3mr113532855d.0.1724705038035; Mon, 26 Aug 2024 13:43:58 -0700 (PDT) Received: from x1n.redhat.com (pool-99-254-121-117.cpe.net.cable.rogers.com. [99.254.121.117]) by smtp.gmail.com with ESMTPSA id af79cd13be357-7a67f3fd6c1sm491055185a.121.2024.08.26.13.43.56 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 26 Aug 2024 13:43:57 -0700 (PDT) From: Peter Xu To: linux-kernel@vger.kernel.org, linux-mm@kvack.org Cc: Gavin Shan , Catalin Marinas , x86@kernel.org, Ingo Molnar , Andrew Morton , Paolo Bonzini , Dave Hansen , Thomas Gleixner , Alistair Popple , kvm@vger.kernel.org, linux-arm-kernel@lists.infradead.org, Sean Christopherson , peterx@redhat.com, Oscar Salvador , Jason Gunthorpe , Borislav Petkov , Zi Yan , Axel Rasmussen , David Hildenbrand , Yan Zhao , Will Deacon , Kefeng Wang , Alex Williamson Subject: [PATCH v2 01/19] mm: Introduce ARCH_SUPPORTS_HUGE_PFNMAP and special bits to pmd/pud Date: Mon, 26 Aug 2024 16:43:35 -0400 Message-ID: <20240826204353.2228736-2-peterx@redhat.com> X-Mailer: git-send-email 2.45.0 In-Reply-To: <20240826204353.2228736-1-peterx@redhat.com> References: <20240826204353.2228736-1-peterx@redhat.com> 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" This patch introduces the option to introduce special pte bit into pmd/puds. Archs can start to define pmd_special / pud_special when supported by selecting the new option. Per-arch support will be added later. Before that, create fallbacks for these helpers so that they are always available. Signed-off-by: Peter Xu --- include/linux/mm.h | 24 ++++++++++++++++++++++++ mm/Kconfig | 13 +++++++++++++ 2 files changed, 37 insertions(+) diff --git a/include/linux/mm.h b/include/linux/mm.h index b0ff06d18c71..d900f15b7650 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -2643,6 +2643,30 @@ static inline pte_t pte_mkspecial(pte_t pte) } #endif =20 +#ifndef CONFIG_ARCH_SUPPORTS_PMD_PFNMAP +static inline bool pmd_special(pmd_t pmd) +{ + return false; +} + +static inline pmd_t pmd_mkspecial(pmd_t pmd) +{ + return pmd; +} +#endif /* CONFIG_ARCH_SUPPORTS_PMD_PFNMAP */ + +#ifndef CONFIG_ARCH_SUPPORTS_PUD_PFNMAP +static inline bool pud_special(pud_t pud) +{ + return false; +} + +static inline pud_t pud_mkspecial(pud_t pud) +{ + return pud; +} +#endif /* CONFIG_ARCH_SUPPORTS_PUD_PFNMAP */ + #ifndef CONFIG_ARCH_HAS_PTE_DEVMAP static inline int pte_devmap(pte_t pte) { diff --git a/mm/Kconfig b/mm/Kconfig index 8078a4b3c509..b23913d4e47e 100644 --- a/mm/Kconfig +++ b/mm/Kconfig @@ -875,6 +875,19 @@ endif # TRANSPARENT_HUGEPAGE config PGTABLE_HAS_HUGE_LEAVES def_bool TRANSPARENT_HUGEPAGE || HUGETLB_PAGE =20 +# TODO: Allow to be enabled without THP +config ARCH_SUPPORTS_HUGE_PFNMAP + def_bool n + depends on TRANSPARENT_HUGEPAGE + +config ARCH_SUPPORTS_PMD_PFNMAP + def_bool y + depends on ARCH_SUPPORTS_HUGE_PFNMAP && HAVE_ARCH_TRANSPARENT_HUGEPAGE + +config ARCH_SUPPORTS_PUD_PFNMAP + def_bool y + depends on ARCH_SUPPORTS_HUGE_PFNMAP && HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD + # # UP and nommu archs use km based percpu allocator # --=20 2.45.0