linux-kernel - Re: [PATCH v2 3/3] x86: Support huge vmalloc mappings

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Message-ID: <0b9dd629-6a2b-0bad-11e4-c49ea1abd223@csgroup.eu>
Date:   Sat, 15 Jan 2022 10:06:18 +0000
From:   Christophe Leroy <christophe.leroy@...roup.eu>
To:     Kefeng Wang <wangkefeng.wang@...wei.com>,
        Jonathan Corbet <corbet@....net>,
        Andrew Morton <akpm@...ux-foundation.org>,
        "linuxppc-dev@...ts.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>,
        "linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        "x86@...nel.org" <x86@...nel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>
CC:     Nicholas Piggin <npiggin@...il.com>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        "H. Peter Anvin" <hpa@...or.com>,
        Michael Ellerman <mpe@...erman.id.au>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Matthew Wilcox <willy@...radead.org>
Subject: Re: [PATCH v2 3/3] x86: Support huge vmalloc mappings



Le 27/12/2021 à 15:59, Kefeng Wang a écrit :
> This patch select HAVE_ARCH_HUGE_VMALLOC to let X86_64 and X86_PAE
> support huge vmalloc mappings.
> 
> Cc: Thomas Gleixner <tglx@...utronix.de>
> Cc: Ingo Molnar <mingo@...hat.com>
> Cc: Borislav Petkov <bp@...en8.de>
> Cc: Dave Hansen <dave.hansen@...ux.intel.com>
> Cc: "H. Peter Anvin" <hpa@...or.com>
> Signed-off-by: Kefeng Wang <wangkefeng.wang@...wei.com>
> ---
>   Documentation/admin-guide/kernel-parameters.txt | 4 ++--
>   arch/x86/Kconfig                                | 1 +
>   arch/x86/kernel/module.c                        | 4 ++--
>   3 files changed, 5 insertions(+), 4 deletions(-)
> 
> diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
> index e3f9fd7ec106..ffce6591ae64 100644
> --- a/Documentation/admin-guide/kernel-parameters.txt
> +++ b/Documentation/admin-guide/kernel-parameters.txt
> @@ -1639,7 +1639,7 @@
>   			precedence over memory_hotplug.memmap_on_memory.
>   
>   
> -	hugevmalloc=	[KNL,PPC,ARM64] Reguires CONFIG_HAVE_ARCH_HUGE_VMALLOC
> +	hugevmalloc=	[KNL,PPC,ARM64,X86] Reguires CONFIG_HAVE_ARCH_HUGE_VMALLOC
>   			Format: { on | off }
>   			Default set by CONFIG_HUGE_VMALLOC_DEFAULT_ENABLED.
>   
> @@ -3424,7 +3424,7 @@
>   
>   	nohugeiomap	[KNL,X86,PPC,ARM64] Disable kernel huge I/O mappings.
>   
> -	nohugevmalloc	[KNL,PPC,ARM64] Disable kernel huge vmalloc mappings.
> +	nohugevmalloc	[KNL,PPC,ARM64,X86] Disable kernel huge vmalloc mappings.
>   
>   	nosmt		[KNL,S390] Disable symmetric multithreading (SMT).
>   			Equivalent to smt=1.
> diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
> index ebe8fc76949a..f6bf6675bbe7 100644
> --- a/arch/x86/Kconfig
> +++ b/arch/x86/Kconfig
> @@ -157,6 +157,7 @@ config X86
>   	select HAVE_ACPI_APEI_NMI		if ACPI
>   	select HAVE_ALIGNED_STRUCT_PAGE		if SLUB
>   	select HAVE_ARCH_AUDITSYSCALL
> +	select HAVE_ARCH_HUGE_VMALLOC		if HAVE_ARCH_HUGE_VMAP
>   	select HAVE_ARCH_HUGE_VMAP		if X86_64 || X86_PAE
>   	select HAVE_ARCH_JUMP_LABEL
>   	select HAVE_ARCH_JUMP_LABEL_RELATIVE
> diff --git a/arch/x86/kernel/module.c b/arch/x86/kernel/module.c
> index 95fa745e310a..6bf5cb7d876a 100644
> --- a/arch/x86/kernel/module.c
> +++ b/arch/x86/kernel/module.c
> @@ -75,8 +75,8 @@ void *module_alloc(unsigned long size)
>   
>   	p = __vmalloc_node_range(size, MODULE_ALIGN,
>   				    MODULES_VADDR + get_module_load_offset(),
> -				    MODULES_END, gfp_mask,
> -				    PAGE_KERNEL, VM_DEFER_KMEMLEAK, NUMA_NO_NODE,
> +				    MODULES_END, gfp_mask, PAGE_KERNEL,
> +				    VM_DEFER_KMEMLEAK | VM_NO_HUGE_VMAP, NUMA_NO_NODE,

you should add a comment like powerpc (commit 8abddd968a30 
("powerpc/64s/radix: Enable huge vmalloc mappings")) to explain why this 
requires VM_NO_HUGE_VMAP

>   				    __builtin_return_address(0));
>   	if (p && (kasan_module_alloc(p, size, gfp_mask) < 0)) {
>   		vfree(p);