linux-kernel - Re: [PATCH v7 3/5] x86/KASLR: Give a warning if movable_node specified without kaslr

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Message-ID: <20180118012001.GC24593@localhost.localdomain>
Date:   Thu, 18 Jan 2018 09:20:01 +0800
From:   Chao Fan <fanc.fnst@...fujitsu.com>
To:     Baoquan He <bhe@...hat.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 3/5] x86/KASLR: Give a warning if movable_node
 specified without kaslr_mem=

On Wed, Jan 17, 2018 at 10:02:48PM +0800, Baoquan He wrote:
>On 01/17/18 at 06:53pm, Chao Fan wrote:
>> Since only 'movable_node' specified without 'kaslr_mem=' may break
>> memory hotplug, so reconmmend users using 'kaslr_mem=' when
>> 'movable_node' specified..
>> 
>> Signed-off-by: Chao Fan <fanc.fnst@...fujitsu.com>
>> ---
>>  arch/x86/boot/compressed/kaslr.c | 10 ++++++++++
>>  1 file changed, 10 insertions(+)
>> 
>> diff --git a/arch/x86/boot/compressed/kaslr.c b/arch/x86/boot/compressed/kaslr.c
>> index b200a7ceafc1..dca846b522fc 100644
>> --- a/arch/x86/boot/compressed/kaslr.c
>> +++ b/arch/x86/boot/compressed/kaslr.c
>> @@ -282,6 +282,16 @@ static int handle_mem_filter(void)
>>  	    !strstr(args, "kaslr_mem="))
>>  		return 0;
>>  
>> +#ifdef CONFIG_MEMORY_HOTPLUG
>> +	/*
>> +	 * Check if "kaslr_mem=" specified when "movable_node" found. If not,
>> +	 * just give warrning. Otherwise memory hotplug could be
>> +	 * affected if kernel put on movable memory regions.
>> +	 */
>> +	if (strstr(args, "movable_node") && !strstr(args, "kaslr_mem="))
>> +		warn("kaslr_mem= should specified when using movable_node.\n");
>		      'kaslr_mem='     ^be

You have given me a large help for my poor English.

Thanks,
Chao Fan

>> +#endif
>> +
>>  	tmp_cmdline = malloc(len + 1);
>>  	if (!tmp_cmdline)
>>  		error("Failed to allocate space for tmp_cmdline");
>> -- 
>> 2.14.3
>> 
>> 
>> 
>
>