linux-kernel - Re: [PATCH v7 4/5] x86/KASLR: Skip memory mirror handling if movable

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Date:   Wed, 17 Jan 2018 22:03:54 +0800
From:   Baoquan He <bhe@...hat.com>
To:     Chao Fan <fanc.fnst@...fujitsu.com>
Cc:     linux-kernel@...r.kernel.org, x86@...nel.org, hpa@...or.com,
        tglx@...utronix.de, mingo@...hat.com, keescook@...omium.org,
        yasu.isimatu@...il.com, indou.takao@...fujitsu.com,
        lcapitulino@...hat.com
Subject: Re: [PATCH v7 4/5] x86/KASLR: Skip memory mirror handling if
 movable_node specified

On 01/17/18 at 06:53pm, Chao Fan wrote:
> In kernel code, if movable_node specified, it will skip the mirror
> feature. So we should also skip mirror feature in KASLR.
> 
> Signed-off-by: Chao Fan <fanc.fnst@...fujitsu.com>
> ---
>  arch/x86/boot/compressed/kaslr.c | 7 +++++++
>  1 file changed, 7 insertions(+)
> 
> diff --git a/arch/x86/boot/compressed/kaslr.c b/arch/x86/boot/compressed/kaslr.c
> index dca846b522fc..84b9db26d026 100644
> --- a/arch/x86/boot/compressed/kaslr.c
> +++ b/arch/x86/boot/compressed/kaslr.c
> @@ -692,6 +692,7 @@ static bool
>  process_efi_entries(unsigned long minimum, unsigned long image_size)
>  {
>  	struct efi_info *e = &boot_params->efi_info;
> +	char *args = (char *)get_cmd_line_ptr();
>  	bool efi_mirror_found = false;
>  	struct mem_vector region;
>  	efi_memory_desc_t *md;
> @@ -725,6 +726,12 @@ process_efi_entries(unsigned long minimum, unsigned long image_size)
>  		}
>  	}
>  
> +#ifdef CONFIG_MEMORY_HOTPLUG
> +	/* Skip memory mirror if movabale_node or immovable_mem specified */
						  ~~~~~~~~~~~~~
						  ^^ need be removed?
> +	if (strstr(args, "movable_node"))
> +		efi_mirror_found = false;
> +#endif
> +
>  	for (i = 0; i < nr_desc; i++) {
>  		md = efi_early_memdesc_ptr(pmap, e->efi_memdesc_size, i);
>  
> -- 
> 2.14.3
> 
> 
>