Re: [PATCH] kdump, vmcoreinfo: Export sme_me_mask value to vmcoreinfo

[lijiang]

å 2018å10æ27æ 00:35, Borislav Petkov åé:
> On Fri, Oct 26, 2018 at 08:32:11PM +0800, lijiang wrote:
>> If SME is enabled in the first kernel, the crash kernel's page table(pgd/pud/pmd/pte)
>> contains the memory encryption mask, so i have to remove the sme mask to obtain the
>> true physical address when dump vmcore.
> 
> Sorry, I have no clue what makedumpfile does exactly so you'd have to
> be more detailed (or wait until I look at it :)). Which kernel accesses
> which kernel's pagetable?
> 
> /me goes and looks at the makedumpfile's manpage...
> 

So sorry that i should provide more detail about this.
Thanks a lot for spending time reading the manpage.

> Ok, it uses vmcoreinfo to exclude pages which would mean, it accesses
> the first kernel's pagetable and traverses it.
> 
> Am I close?
> 

Yes, your explanation is perfect.

Thanks.
Lianbo