From nobody Tue Dec 2 02:30:41 2025 Received: from mail-wr1-f54.google.com (mail-wr1-f54.google.com [209.85.221.54]) (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 EFE8E393DC0 for ; Wed, 19 Nov 2025 15:45:51 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.221.54 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1763567155; cv=none; b=T/ehr72QiLamBJzPofGk5h/cWr6z7V9ZkMHcHhjnaTJh5Ileap6M4yIDm7sz2BG5a5AvRwH7ecO3rdOBBdINPm74f2BqvLTipgfRVCt2gn0gq4o9SAJcJwOo6m0PSBR6aek0KqmUqgC6vOH3W2e/q0mcgymk5gxxCP/CJsc6I2c= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1763567155; c=relaxed/simple; bh=P2BpXmRz69DL/Mo9gvHTNRnm0uC420IorTT0EImakDQ=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=S18k6XNgYM1aSnlFz7cpRPMgJavlczHqbxDe8kkrioRK8j7+P+hWzkm5U3U1VaZLw0bEy9Yv5walo2450XcbxUSxZlluNn8eikTQlWUJCM5oRtzg1cXtmS9vAlyol95PSxwteB6AzDj+dP8bdHB7WPjdDQAMBCRUjZaMpsNUk+U= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linaro.org; spf=pass smtp.mailfrom=linaro.org; dkim=pass (2048-bit key) header.d=linaro.org header.i=@linaro.org header.b=gvo8Ljd/; arc=none smtp.client-ip=209.85.221.54 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linaro.org Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linaro.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=linaro.org header.i=@linaro.org header.b="gvo8Ljd/" Received: by mail-wr1-f54.google.com with SMTP id ffacd0b85a97d-42b32a3e78bso5589477f8f.0 for ; Wed, 19 Nov 2025 07:45:51 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; t=1763567148; x=1764171948; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=l/EyDboeiBDU/UfklOwVUegNW3M8PrbX9Ov8/f+MrlA=; b=gvo8Ljd//s70Ad6SW76idmhN0fRup0Xow21Ym1r2UBYinVsb5JC3n8VBpMue/pLWkU htLFLuUG9II22JuzokqrUBl0FIowDCJB+lvn2qVtL1YvmFo7+wDaTYDGikVNNEn1YcH8 Iuhzb3XiCrFIuROQ3mOZhNdTianSbsO+8pjZSfDIvE4fFYqNI8gtbghZ+usPXOFIq8iq i7U4tprdGjDoAg5SYQnep+sFOZ250TUOuoTa24+ZPpIoZVtyds47wZSiGn/keBZApxa7 Pam02IHJfIOB0F9q/5d2km4Th7hREloIwrLIh/HTlXC2IOIcZEQ7v0o90NFN6ydDKPp6 rVHw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1763567148; x=1764171948; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-gg:x-gm-message-state:from :to:cc:subject:date:message-id:reply-to; bh=l/EyDboeiBDU/UfklOwVUegNW3M8PrbX9Ov8/f+MrlA=; b=xEn2+KTJt+n5TS/dN9yMGMhVU631R50G0hAMLzYDWwEp/jhZdL/EFYv9rjYH2vsUzV oDMiFZZaE//t7RMz5vVN/dbHOD4G5E3VMe5+kPiVSXfplWpasAKBFXKWr+RLGZSSzJ/9 EGVU34Tyo0Jff1x4ElKaHBm095/i9t5AKOIT3U0GGuIKEUBygy2ii57/tdm4FrGP7vIz u+2q63DwNvF5oFSxetL1b/nLicq4/s8nlkosx/GGGVCV8a/UGGgk/9J1QuJPdKARB/zG x4S5Csmz2tYTu00ZFrylYpUcjUIG76Y8pKPYNDpJqBEP+9OT5tPFZDCeAjt3KuH6zVeW X6dg== X-Forwarded-Encrypted: i=1; AJvYcCVrVE54p7nSlTXNE7SSLdCRAZOCib4WWnfENCaminjxUG3xsXttSsoHAUpSY281jq61POa82KMsZ/TwqmI=@vger.kernel.org X-Gm-Message-State: AOJu0YwFuN9rHeLFrP+68r5gkli+U5JM6cjSiWcyDk/MJkyAQqNF6Tv+ e/FGLFzuw5uQhncUtutm7Fu2y/6gfkFxSPP/LxSgb8CBd4r9uP2tJK7lmWCKmzGp3oM= X-Gm-Gg: ASbGncvw6TALqPskxLWWW4++iAMVtK/77VuDCRdb+j39wRyCnx4l8C/L1bZFZBVmDgM N1/bU5d0BLvOB4qKD0U5MVwyyQqjHx9e2rS35mWCseuhXBkhrB6CbZM7wd/8BCdYczf7LDEDv8v KRNCIyAUxOoc4sRwPs8BGjICEtTiiM3/mxNhdQFP7ZT4+r8BROJMpdWzHhp43eNyf2DalpqWbQj BOSEcTh5uDFCDVmIsntVmpuVcShdiUGdzUTsf8vc36ETacN3lzLaEO5mNb7EycLyTW8sSl1jrOy PswZPuonPB7h/3DjhTtOJF9m2Q1qpNkbld8jsJ55G27D34On4ex16JNFLFI30C7ekd6bB0A1vIJ L47LTHjW60CzRAbTPXwUwg0HBRQvsq6VEBqltW/xBNZbSKu4mvoGL+m0YApBXb3i06ii35TjK3/ WBHxN/fDrI2Vz0plaBDHA= X-Google-Smtp-Source: AGHT+IG3jCLeDmXIRQk0s6Z/im1uj+pkHlGcqCZtyflKDhFiJA87zd6Y92IL7f4uFHeiMPUMai5jbg== X-Received: by 2002:a05:6000:64a:b0:42b:396e:2817 with SMTP id ffacd0b85a97d-42b59378468mr19534486f8f.40.1763567148170; Wed, 19 Nov 2025 07:45:48 -0800 (PST) Received: from eugen-station.. ([82.76.24.202]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-42b53dea1c9sm38765632f8f.0.2025.11.19.07.45.46 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 19 Nov 2025 07:45:47 -0800 (PST) From: Eugen Hristev To: linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, tglx@linutronix.de, andersson@kernel.org, pmladek@suse.com, rdunlap@infradead.org, corbet@lwn.net, david@redhat.com, mhocko@suse.com Cc: tudor.ambarus@linaro.org, mukesh.ojha@oss.qualcomm.com, linux-arm-kernel@lists.infradead.org, linux-hardening@vger.kernel.org, jonechou@google.com, rostedt@goodmis.org, linux-doc@vger.kernel.org, devicetree@vger.kernel.org, linux-remoteproc@vger.kernel.org, linux-arch@vger.kernel.org, tony.luck@intel.com, kees@kernel.org, Eugen Hristev Subject: [PATCH 18/26] mm/memblock: Add MEMBLOCK_INSPECT flag Date: Wed, 19 Nov 2025 17:44:19 +0200 Message-ID: <20251119154427.1033475-19-eugen.hristev@linaro.org> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20251119154427.1033475-1-eugen.hristev@linaro.org> References: <20251119154427.1033475-1-eugen.hristev@linaro.org> 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 memblock flag indicates that a specific block is registered into an inspection table. The block can be marked for inspection using memblock_mark_inspect() and cleared with memblock_clear_inspect() Signed-off-by: Eugen Hristev --- include/linux/memblock.h | 7 +++++++ mm/memblock.c | 36 ++++++++++++++++++++++++++++++++++++ 2 files changed, 43 insertions(+) diff --git a/include/linux/memblock.h b/include/linux/memblock.h index 221118b5a16e..c3e55a4475cf 100644 --- a/include/linux/memblock.h +++ b/include/linux/memblock.h @@ -51,6 +51,10 @@ extern unsigned long long max_possible_pfn; * memory reservations yet, so we get scratch memory from the previous * kernel that we know is good to use. It is the only memory that * allocations may happen from in this phase. + * @MEMBLOCK_INSPECT: memory region is annotated in kernel memory inspecti= on + * table. This means a dedicated entry will be created for this region whi= ch + * will contain the memory's address and size. This allows kernel inspecto= rs + * to retrieve the memory. */ enum memblock_flags { MEMBLOCK_NONE =3D 0x0, /* No special request */ @@ -61,6 +65,7 @@ enum memblock_flags { MEMBLOCK_RSRV_NOINIT =3D 0x10, /* don't initialize struct pages */ MEMBLOCK_RSRV_KERN =3D 0x20, /* memory reserved for kernel use */ MEMBLOCK_KHO_SCRATCH =3D 0x40, /* scratch memory for kexec handover */ + MEMBLOCK_INSPECT =3D 0x80, /* memory selected for kernel inspection */ }; =20 /** @@ -149,6 +154,8 @@ unsigned long memblock_addrs_overlap(phys_addr_t base1,= phys_addr_t size1, bool memblock_overlaps_region(struct memblock_type *type, phys_addr_t base, phys_addr_t size); bool memblock_validate_numa_coverage(unsigned long threshold_bytes); +int memblock_mark_inspect(phys_addr_t base, phys_addr_t size); +int memblock_clear_inspect(phys_addr_t base, phys_addr_t size); int memblock_mark_hotplug(phys_addr_t base, phys_addr_t size); int memblock_clear_hotplug(phys_addr_t base, phys_addr_t size); int memblock_mark_mirror(phys_addr_t base, phys_addr_t size); diff --git a/mm/memblock.c b/mm/memblock.c index e23e16618e9b..a5df5ab286e5 100644 --- a/mm/memblock.c +++ b/mm/memblock.c @@ -17,6 +17,7 @@ #include #include #include +#include =20 #ifdef CONFIG_KEXEC_HANDOVER #include @@ -1016,6 +1017,40 @@ static int __init_memblock memblock_setclr_flag(stru= ct memblock_type *type, return 0; } =20 +/** + * memblock_mark_inspect - Mark inspectable memory with flag MEMBLOCK_INSP= ECT. + * @base: the base phys addr of the region + * @size: the size of the region + * + * Return: 0 on success, -errno on failure. + */ +int __init_memblock memblock_mark_inspect(phys_addr_t base, phys_addr_t si= ze) +{ + int ret; + + ret =3D memblock_setclr_flag(&memblock.memory, base, size, 1, MEMBLOCK_IN= SPECT); + if (ret) + return ret; + + meminspect_lock_register_pa(base, size); + + return 0; +} + +/** + * memblock_clear_inspect - Clear flag MEMBLOCK_INSPECT for a specified re= gion. + * @base: the base phys addr of the region + * @size: the size of the region + * + * Return: 0 on success, -errno on failure. + */ +int __init_memblock memblock_clear_inspect(phys_addr_t base, phys_addr_t s= ize) +{ + meminspect_lock_unregister_pa(base, size); + + return memblock_setclr_flag(&memblock.memory, base, size, 0, MEMBLOCK_INS= PECT); +} + /** * memblock_mark_hotplug - Mark hotpluggable memory with flag MEMBLOCK_HOT= PLUG. * @base: the base phys addr of the region @@ -2704,6 +2739,7 @@ static const char * const flagname[] =3D { [ilog2(MEMBLOCK_RSRV_NOINIT)] =3D "RSV_NIT", [ilog2(MEMBLOCK_RSRV_KERN)] =3D "RSV_KERN", [ilog2(MEMBLOCK_KHO_SCRATCH)] =3D "KHO_SCRATCH", + [ilog2(MEMBLOCK_INSPECT)] =3D "INSPECT", }; =20 static int memblock_debug_show(struct seq_file *m, void *private) --=20 2.43.0