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

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Message-ID: <20180717010132.GA6816@localhost.localdomain>
Date:   Tue, 17 Jul 2018 09:01:33 +0800
From:   Chao Fan <fanc.fnst@...fujitsu.com>
To:     Ingo Molnar <mingo@...nel.org>
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

On Mon, Jul 16, 2018 at 01:44:47PM +0200, Ingo Molnar wrote:
>
>* 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'??

Sorry for the typo, will change it immidiately.

Thanks,
Chao Fan

>
>Thanks,
>
>	Ingo
>
>