linux-kernel - Re: [PATCH 1/5 V5] Add a function(ioremap_encrypted) for kdump when AMD sme enabled

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Message-ID: <20180709092901.GA22182@nazgul.tnic>
Date:   Mon, 9 Jul 2018 11:29:01 +0200
From:   Borislav Petkov <bp@...en8.de>
To:     lijiang <lijiang@...hat.com>
Cc:     linux-kernel@...r.kernel.org, mingo@...hat.com, tglx@...utronix.de,
        hpa@...or.com, ebiederm@...ssion.com, joro@...tes.org,
        thomas.lendacky@....com, dyoung@...hat.com,
        kexec@...ts.infradead.org, iommu@...ts.linux-foundation.org,
        bhe@...hat.com
Subject: Re: [PATCH 1/5 V5] Add a function(ioremap_encrypted) for kdump when
 AMD sme enabled

On Mon, Jul 09, 2018 at 02:28:11PM +0800, lijiang wrote:
> Last week, I had tried many ways to do this work, but it looks
> like that the ways of deducing address is not suitable to another
> scenarios, such as mapping some devices mmio space, which are
> unencrypted, and the device mmio space is outside kdump kernel like
> the old memory, but the old memory is encrypted, we can't find the
> general rules to decide when to encrypt or not.

If we can't find the "general rules" how is the caller supposed to know
how to access the memory?

-- 
Regards/Gruss,
    Boris.

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