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

Borislav Petkov bp at alien8.de
Fri Oct 26 09:35:54 PDT 2018


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...

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

Am I close?

-- 
Regards/Gruss,
    Boris.

ECO tip #101: Trim your mails when you reply.
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