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

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Date:   Sat, 27 Oct 2018 10:19:52 +0800
From:   lijiang <lijiang@...hat.com>
To:     Borislav Petkov <bp@...en8.de>
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

在 2018年10月27日 00:35, Borislav Petkov 写道:
> 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