linux-kernel - Re: [PATCH] kdump, vmcoreinfo: Export sme_me

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Message-ID: <20181026163554.GA26331@nazgul.tnic>
Date:   Fri, 26 Oct 2018 18:35:54 +0200
From:   Borislav Petkov <bp@...en8.de>
To:     lijiang <lijiang@...hat.com>
Cc:     linux-kernel@...r.kernel.org, kexec@...ts.infradead.org,
        tglx@...utronix.de, mingo@...hat.com, x86@...nel.org,
        bhe@...hat.com, dyoung@...hat.com
Subject: Re: [PATCH] kdump, vmcoreinfo: Export sme_me_mask value to vmcoreinfo

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.
--