linux-kernel - Re: [RFC PATCH v2 3/4] x86/boot/KASLR: Walk srat tables to filter immovable memory

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Date:   Mon, 16 Jul 2018 13:44:47 +0200
From:   Ingo Molnar <mingo@...nel.org>
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, bhe@...hat.com,
        keescook@...omium.org, yasu.isimatu@...il.com,
        indou.takao@...fujitsu.com, lcapitulino@...hat.com,
        caoj.fnst@...fujitsu.com, douly.fnst@...fujitsu.com
Subject: Re: [RFC PATCH v2 3/4] x86/boot/KASLR: Walk srat tables to filter
 immovable memory


* Chao Fan <fanc.fnst@...fujitsu.com> wrote:

> If 'CONFIG_MEMORY_HOTREMOVE' specified, walk the acpi srat memory
> tables, store the immovable memory regions, so that kaslr can get
> the information abouth where can be selected or not.
> If 'CONFIG_MEMORY_HOTREMOVE' not specified, go on the old code.
> 
> Signed-off-by: Chao Fan <fanc.fnst@...fujitsu.com>
> ---
>  arch/x86/boot/compressed/kaslr.c | 55 ++++++++++++++++++++++++++++++++
>  1 file changed, 55 insertions(+)
> 
> diff --git a/arch/x86/boot/compressed/kaslr.c b/arch/x86/boot/compressed/kaslr.c
> index 531c9876f573..0ec5aab915db 100644
> --- a/arch/x86/boot/compressed/kaslr.c
> +++ b/arch/x86/boot/compressed/kaslr.c
> @@ -31,6 +31,7 @@
>  
>  #include "misc.h"
>  #include "error.h"
> +#include "acpitb.h"
>  #include "../string.h"
>  
>  #include <generated/compile.h>
> @@ -104,6 +105,14 @@ static bool memmap_too_large;
>  /* Store memory limit specified by "mem=nn[KMG]" or "memmap=nn[KMG]" */
>  unsigned long long mem_limit = ULLONG_MAX;
>  
> +#ifdef CONFIG_MEMORY_HOTREMOVE
> +/* Store the movable memory */
> +struct mem_vector immovable_mem[MAX_NUMNODES*2];
> +
> +/* Store the num of movable mem regions */
> +static int num_immovable_mem;
> +#endif

So comment says 'movable', but variables are named 'immovable'??

Thanks,

	Ingo