linux-kernel - Re: [PATCH 1/3] mm: HVO: introduce helper function to update and flush pgtable

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Date: Fri, 15 Dec 2023 14:16:54 +0800
From: Kefeng Wang <wangkefeng.wang@...wei.com>
To: Nanyong Sun <sunnanyong@...wei.com>, <catalin.marinas@....com>,
	<will@...nel.org>, <mike.kravetz@...cle.com>, <muchun.song@...ux.dev>,
	<akpm@...ux-foundation.org>, <anshuman.khandual@....com>
CC: <willy@...radead.org>, <linux-arm-kernel@...ts.infradead.org>,
	<linux-kernel@...r.kernel.org>, <linux-mm@...ck.org>
Subject: Re: [PATCH 1/3] mm: HVO: introduce helper function to update and
 flush pgtable



On 2023/12/14 15:39, Nanyong Sun wrote:
> Add pmd/pte update and tlb flush helper function to update page
> table. This refactoring patch is designed to facilitate each
> architecture to implement its own special logic in preparation
> for the arm64 architecture to follow the necessary break-before-make
> sequence when updating page tables.
> 
> Signed-off-by: Nanyong Sun <sunnanyong@...wei.com>
> ---
>   mm/hugetlb_vmemmap.c | 55 ++++++++++++++++++++++++++++++++++----------
>   1 file changed, 43 insertions(+), 12 deletions(-)
> 
> diff --git a/mm/hugetlb_vmemmap.c b/mm/hugetlb_vmemmap.c
> index 87818ee7f01d..49e8b351def3 100644
> --- a/mm/hugetlb_vmemmap.c
> +++ b/mm/hugetlb_vmemmap.c
> @@ -45,6 +45,37 @@ struct vmemmap_remap_walk {
>   	unsigned long		flags;
>   };
>   
> +#ifndef vmemmap_update_pmd
> +static inline void vmemmap_update_pmd(unsigned long start,
> +				      pmd_t *pmd, pte_t *pgtable)

pgtable ->  ptep

> +{
> +	pmd_populate_kernel(&init_mm, pmd, pgtable);
> +}
> +#endif
> +
> +#ifndef vmemmap_update_pte
> +static inline void vmemmap_update_pte(unsigned long addr,
> +				      pte_t *pte, pte_t entry)

pte   -> ptep
entry -> pte

> +{
> +	set_pte_at(&init_mm, addr, pte, entry);
> +}
> +#endif