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

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Message-ID: <BYAPR21MB1688608129815E4F90B9CAA3D7DB9@BYAPR21MB1688.namprd21.prod.outlook.com>
Date:   Tue, 7 Feb 2023 19:48:06 +0000
From:   "Michael Kelley (LINUX)" <mikelley@...rosoft.com>
To:     Borislav Petkov <bp@...en8.de>
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Subject: RE: [PATCH v5 06/14] x86/ioremap: Support hypervisor specified range
 to map as encrypted

From: Borislav Petkov <bp@...en8.de> Sent: Tuesday, February 7, 2023 11:33 AM
> 
> On Tue, Feb 07, 2023 at 07:01:25PM +0000, Michael Kelley (LINUX) wrote:
> > Unless there are objections, I'll go with CC_ATTR_PARAVISOR_DEVICES,
> 
> What does "DEVICES" mean in this context?
> 
> You need to think about !virt people too who are already confused by the
> word "paravisor". :-)
> 

Maybe I misunderstood your previous comment about "Either 1".   We can
avoid "PARAVISOR" entirely by going with two attributes:

CC_ATTR_ACCESS_IOAPIC_ENCRYPTED
CC_ATTR_ACCESS_TPM_ENCRYPTED

These are much more specific, and relatively short, and having two allows
decoupling the handling of the IO-APIC and TPM.  Combining into the single

CC_ATTR_ACCESS_IOAPIC_AND_TPM_ENCRYPTED

also works but is longer.

Capturing the full meaning in the string names is probably impossible.
Referring to the comment for the definition will be required for a full
understanding.

Michael