linux-kernel - Re: [PATCH 2/2 v5] kdump,vmcoreinfo: Export the value of sme mask to vmcoreinfo

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Date:   Mon, 7 Jan 2019 17:42:55 +0800
From:   lijiang <lijiang@...hat.com>
To:     Baoquan He <bhe@...hat.com>
Cc:     linux-kernel@...r.kernel.org, kexec@...ts.infradead.org,
        tglx@...utronix.de, mingo@...hat.com, bp@...en8.de, x86@...nel.org,
        akpm@...ux-foundation.org, dyoung@...hat.com,
        linux-doc@...r.kernel.org, k-hagio@...jp.nec.com,
        anderson@...hat.com
Subject: Re: [PATCH 2/2 v5] kdump,vmcoreinfo: Export the value of sme mask to
 vmcoreinfo

在 2019年01月07日 10:29, Baoquan He 写道:
> On 01/07/19 at 09:47am, Lianbo Jiang wrote:
>> For AMD machine with SME feature, makedumpfile tools need to know
>> whether the crash kernel was encrypted or not. If SME is enabled
>               ^ crashed
>> in the first kernel, the crash kernel's page table(pgd/pud/pmd/pte)
>                            ^ crashed
>> contains the memory encryption mask, so need to remove the sme mask
>                                         "makedumpfile needs" or
>                                        in makedumpfile need to remove...

Thanks for your comment.

This will be modified in next post.

Regards,
Lianbo

>> to obtain the true physical address.
>>
>> Signed-off-by: Lianbo Jiang <lijiang@...hat.com>
>> ---
>>  arch/x86/kernel/machine_kexec_64.c | 3 +++
>>  1 file changed, 3 insertions(+)
>>
>> diff --git a/arch/x86/kernel/machine_kexec_64.c b/arch/x86/kernel/machine_kexec_64.c
>> index 4c8acdfdc5a7..bc4108096b18 100644
>> --- a/arch/x86/kernel/machine_kexec_64.c
>> +++ b/arch/x86/kernel/machine_kexec_64.c
>> @@ -352,10 +352,13 @@ void machine_kexec(struct kimage *image)
>>  
>>  void arch_crash_save_vmcoreinfo(void)
>>  {
>> +	u64 sme_mask = sme_me_mask;
>> +
>>  	VMCOREINFO_NUMBER(phys_base);
>>  	VMCOREINFO_SYMBOL(init_top_pgt);
>>  	vmcoreinfo_append_str("NUMBER(pgtable_l5_enabled)=%d\n",
>>  			pgtable_l5_enabled());
>> +	VMCOREINFO_NUMBER(sme_mask);
>>  
>>  #ifdef CONFIG_NUMA
>>  	VMCOREINFO_SYMBOL(node_data);
>> -- 
>> 2.17.1
>>