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

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Date:   Thu, 18 Jan 2018 09:13:57 +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 4/5] x86/KASLR: Skip memory mirror handling if
 movable_node specified

On Wed, Jan 17, 2018 at 10:03:54PM +0800, Baoquan He wrote:
>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?

Yes, sorry for the mistake, I change the old versions and miss some
points. Will change that.

Thanks,
Chao Fan

>> +	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
>> 
>> 
>> 
>
>