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X-CSE-ConnectionGUID: a4ykBX6cT3i3VFaBT4T7QA== X-CSE-MsgGUID: lEFxdz+DSLaunaWrDTwADA== X-IronPort-AV: E=McAfee;i="6700,10204,11351"; a="63346299" X-IronPort-AV: E=Sophos;i="6.13,302,1732608000"; d="scan'208";a="63346299" Received: from fmviesa004.fm.intel.com ([10.60.135.144]) by orvoesa101.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 20 Feb 2025 10:02:54 -0800 X-CSE-ConnectionGUID: W9agr/+RTS6tJSBDtvX1pg== X-CSE-MsgGUID: VDrQa2UqS4KG472jDCWkCw== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.13,302,1732608000"; d="scan'208";a="120219174" Received: from puneetse-mobl.amr.corp.intel.com (HELO [10.125.110.82]) ([10.125.110.82]) by fmviesa004-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 20 Feb 2025 10:02:53 -0800 Message-ID: Date: Thu, 20 Feb 2025 10:02:54 -0800 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH] x86/vmemmap: Synchronize with global pgds if populating init_mm's pgd To: Gwan-gyeong Mun , linux-kernel@vger.kernel.org Cc: osalvador@suse.de, 42.hyeyoo@gmail.com, byungchul@sk.com, dave.hansen@linux.intel.com, luto@kernel.org, peterz@infradead.org, akpm@linux-foundation.org, stable@vger.kernel.org, linux-mm@kvack.org, max.byungchul.park@sk.com, max.byungchul.park@gmail.com References: <20250220064105.808339-1-gwan-gyeong.mun@intel.com> From: Dave Hansen Content-Language: en-US Autocrypt: addr=dave.hansen@intel.com; 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charset=UTF-8 Content-Transfer-Encoding: 7bit X-Rspam-User: X-Rspamd-Server: rspam08 X-Rspamd-Queue-Id: 948AD20014 X-Stat-Signature: 95ak146zeoszxk5ndcb7c3oyqhcy8ogt X-HE-Tag: 1740074575-231132 X-HE-Meta: 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 VSIZl5Ae C0SkEtGJDsj2bTq5lMc5NPcw35QA41+H4V2e8vFKyH6CIwm3Fkyi5ECNBI21SPwGI/YIQQn30BCQso/5Zfasy9t4XdOx5ATdbmMDun09OWEUpzIBJY2lBMtqw6lVtKXxJfZFZZgiVg56ofN+ucobZRgSIj4HiPk+YMq3q95N1UBBpApEVqRLzqaY1P0ZIvhPOdKwHB+s2JMv5SihpyNFttmCDDwq5gSRQdIsMlRGAnAGP1J4OSn+qnEyixyMd3HXjP9oa4M4eyPOR2xOFwJO6WRCV1cGPgy0UPc1JMs0E5LDwO/HKZY3pn3pRPIKuzcsDXM3R X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 2/19/25 22:41, Gwan-gyeong Mun wrote: > diff --git a/arch/x86/mm/init_64.c b/arch/x86/mm/init_64.c > index 01ea7c6df303..7935859bcc21 100644 > --- a/arch/x86/mm/init_64.c > +++ b/arch/x86/mm/init_64.c > @@ -1498,6 +1498,54 @@ static long __meminitdata addr_start, addr_end; > static void __meminitdata *p_start, *p_end; > static int __meminitdata node_start; > > +static void * __meminit vmemmap_alloc_block_zero(unsigned long size, int node) > +{ > + void *p = vmemmap_alloc_block(size, node); > + > + if (!p) > + return NULL; > + memset(p, 0, size); > + > + return p; > +} This is a pure copy and paste of the generic function. I assume this is because the mm/sparse-vmemmap.c is static. But this kind of copying is really unfortunate. ... > +pgd_t * __meminit vmemmap_pgd_populate(unsigned long addr, int node) > +{ > + pgd_t *pgd = pgd_offset_k(addr); > + > + if (pgd_none(*pgd)) { > + void *p = vmemmap_alloc_block_zero(PAGE_SIZE, node); > + > + if (!p) > + return NULL; > + > + pgd_populate(&init_mm, pgd, p); > + sync_global_pgds(addr, addr); > + } > + > + return pgd; > +} I'd _really_ like to find another way to do this. We really don't want to add copy-and-paste versions of generic functions that we now need to maintain on the x86 side. The _best_ way is probably to create some p*d_populate_kernel() helpers: void pgd_populate_kernel(unsigned long addr, pgd_t *pgd, p4d_t *p4d) { pgd_populate(&init_mm, pgd, p4d); arch_sync_global_pgds(addr, addr+something); } and move over most of the callers of: p*d_populate(&init_mm, ...); Because I suspect that'll fix your issue _and_ solve the generic class of issues where folks populate a kernel page table entry but forget to call sync_global_pgds().