Re: [PATCH] kdump, vmcoreinfo: Export sme_me_mask value to vmcoreinfo
Date: Fri Oct 26 2018 - 22:20:13 EST
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.