linux-kernel - Re: [PATCH v5 06/14] x86/ioremap: Support hypervisor specified range to map as encrypted

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Message-ID: <Y+JG9+zdSwZlz6FU@zn.tnic>
Date:   Tue, 7 Feb 2023 13:41:27 +0100
From:   Borislav Petkov <bp@...en8.de>
To:     "Michael Kelley (LINUX)" <mikelley@...rosoft.com>
Cc:     "hpa@...or.com" <hpa@...or.com>, KY Srinivasan <kys@...rosoft.com>,
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Subject: Re: [PATCH v5 06/14] x86/ioremap: Support hypervisor specified range
 to map as encrypted

On Thu, Feb 02, 2023 at 05:49:44AM +0000, Michael Kelley (LINUX) wrote:
> I could do:
> 1.  CC_ATTR_PARAVISOR_SPLIT_ADDRESS_SPACE, which is similar to
>     what I had for v1 & v2.   At the time, somebody commented that
>     this might be a bit too general.
> 2.  Keep CC_ATTR_ACCESS_IOAPIC_ENCRYPTED and add
>     CC_ATTR_ACCESS_TPM_ENCRYPTED, which would decouple them
> 3.  CC_ATTR_ACCESS_IOAPIC_AND_TPM_ENCRYPTED, which is very
>     narrow and specific.
> 
> I have weak preference for #1 above, but I could go with any of them.
> What's your preference?

Either 1. but a shorter name or something which works with the TDX side
too.

Or are there no similar TDX solutions planned where the guest runs
unmodified and under a paravisor?

> For v6 of the patch series, I've coded devm_ioremap_resource_enc() to call
> __devm_ioremap(), which then calls ioremap_encrypted().  I've updated the
> TPM driver to use cc_platform_has() with whatever attribute name we agree
> on to decide between devm_ioremap_resource_enc() and
> devm_ioremap_resource().
> 
> If this approach is OK with the TPM driver maintainers, I'm good with it.
> More robust handling of a mix of encrypted and decrypted devices can get
> sorted out later.

Makes sense to me...

Thx.

-- 
Regards/Gruss,
    Boris.

https://people.kernel.org/tglx/notes-about-netiquette