Re: [PATCH v2 3/8] riscv: mm: Refactor create_linear_mapping_range() for memory hot add

From: Oscar Salvador <osalvador@suse.de>
To: "Björn Töpel" <bjorn@kernel.org>
Cc: "Albert Ou" <aou@eecs.berkeley.edu>,
	"Alexandre Ghiti" <alexghiti@rivosinc.com>,
	"Chethan Seshadri" <Chethan.Seshadri@catalinasystems.io>,
	"David Hildenbrand" <david@redhat.com>,
	linux-kernel@vger.kernel.org,
	"Andrew Bresticker" <abrestic@rivosinc.com>,
	"Björn Töpel" <bjorn@rivosinc.com>,
	"Santosh Mamila" <santosh.mamila@catalinasystems.io>,
	linux-mm@kvack.org,
	"Sivakumar Munnangi" <siva.munnangi@catalinasystems.io>,
	"Palmer Dabbelt" <palmer@dabbelt.com>,
	"Paul Walmsley" <paul.walmsley@sifive.com>,
	linux-riscv@lists.infradead.org,
	virtualization@lists.linux-foundation.org,
	"Lorenzo Stoakes" <lstoakes@gmail.com>
Subject: Re: [PATCH v2 3/8] riscv: mm: Refactor create_linear_mapping_range() for memory hot add
Date: Tue, 14 May 2024 22:37:30 +0200	[thread overview]
Message-ID: <ZkPLimx-TSkufhjK@localhost.localdomain> (raw)
In-Reply-To: <20240514140446.538622-4-bjorn@kernel.org>

On Tue, May 14, 2024 at 04:04:41PM +0200, Björn Töpel wrote:
> From: Björn Töpel <bjorn@rivosinc.com>
> 
> Add a parameter to the direct map setup function, so it can be used in
> arch_add_memory() later.
> 
> Signed-off-by: Björn Töpel <bjorn@rivosinc.com>

Reviewed-by: Oscar Salvador <osalvador@suse.de>

> ---
>  arch/riscv/mm/init.c | 15 ++++++---------
>  1 file changed, 6 insertions(+), 9 deletions(-)
> 
> diff --git a/arch/riscv/mm/init.c b/arch/riscv/mm/init.c
> index c969427eab88..6f72b0b2b854 100644
> --- a/arch/riscv/mm/init.c
> +++ b/arch/riscv/mm/init.c
> @@ -1227,7 +1227,7 @@ asmlinkage void __init setup_vm(uintptr_t dtb_pa)
>  }
>  
>  static void __meminit create_linear_mapping_range(phys_addr_t start, phys_addr_t end,
> -						  uintptr_t fixed_map_size)
> +						  uintptr_t fixed_map_size, const pgprot_t *pgprot)
>  {
>  	phys_addr_t pa;
>  	uintptr_t va, map_size;
> @@ -1238,7 +1238,7 @@ static void __meminit create_linear_mapping_range(phys_addr_t start, phys_addr_t
>  					    best_map_size(pa, va, end - pa);
>  
>  		create_pgd_mapping(swapper_pg_dir, va, pa, map_size,
> -				   pgprot_from_va(va));
> +				   pgprot ? *pgprot : pgprot_from_va(va));
>  	}
>  }
>  
> @@ -1282,22 +1282,19 @@ static void __init create_linear_mapping_page_table(void)
>  		if (end >= __pa(PAGE_OFFSET) + memory_limit)
>  			end = __pa(PAGE_OFFSET) + memory_limit;
>  
> -		create_linear_mapping_range(start, end, 0);
> +		create_linear_mapping_range(start, end, 0, NULL);
>  	}
>  
>  #ifdef CONFIG_STRICT_KERNEL_RWX
> -	create_linear_mapping_range(ktext_start, ktext_start + ktext_size, 0);
> -	create_linear_mapping_range(krodata_start,
> -				    krodata_start + krodata_size, 0);
> +	create_linear_mapping_range(ktext_start, ktext_start + ktext_size, 0, NULL);
> +	create_linear_mapping_range(krodata_start, krodata_start + krodata_size, 0, NULL);
>  
>  	memblock_clear_nomap(ktext_start,  ktext_size);
>  	memblock_clear_nomap(krodata_start, krodata_size);
>  #endif
>  
>  #ifdef CONFIG_KFENCE
> -	create_linear_mapping_range(kfence_pool,
> -				    kfence_pool + KFENCE_POOL_SIZE,
> -				    PAGE_SIZE);
> +	create_linear_mapping_range(kfence_pool, kfence_pool + KFENCE_POOL_SIZE, PAGE_SIZE, NULL);
>  
>  	memblock_clear_nomap(kfence_pool, KFENCE_POOL_SIZE);
>  #endif
> -- 
> 2.40.1
> 

-- 
Oscar Salvador
SUSE Labs

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