[v2] riscv: Memory Hot(Un)Plug support

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

Posted by Björn Töpel 1 year, 9 months ago

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>
---
 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

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

Posted by Oscar Salvador 1 year, 9 months ago

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

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

Posted by Alexandre Ghiti 1 year, 9 months ago

On Tue, May 14, 2024 at 4:05 PM Björn Töpel <bjorn@kernel.org> 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>
> ---
>  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
>

You can add:

Reviewed-by: Alexandre Ghiti <alexghiti@rivosinc.com>

Thanks,

Alex

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

Posted by David Hildenbrand 1 year, 9 months ago

On 14.05.24 16:04, 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: David Hildenbrand <david@redhat.com>

-- 
Cheers,

David / dhildenb

[PATCH v2 1/8] riscv: mm: Pre-allocate vmemmap/direct map PGD entries
[PATCH v2 2/8] riscv: mm: Change attribute from __init to __meminit for page functions
[PATCH v2 3/8] riscv: mm: Refactor create_linear_mapping_range() for memory hot add
[PATCH v2 4/8] riscv: mm: Add memory hotplugging support
[PATCH v2 5/8] riscv: mm: Take memory hotplug read-lock during kernel page table dump
[PATCH v2 6/8] riscv: Enable memory hotplugging for RISC-V
[PATCH v2 7/8] virtio-mem: Enable virtio-mem for RISC-V
[PATCH v2 8/8] riscv: mm: Add support for ZONE_DEVICE