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

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Message-ID: <Y+aVFxrE6a6b37XN@zn.tnic>
Date:   Fri, 10 Feb 2023 20:03:51 +0100
From:   Borislav Petkov <bp@...en8.de>
To:     Sean Christopherson <seanjc@...gle.com>
Cc:     "Michael Kelley (LINUX)" <mikelley@...rosoft.com>,
        Dave Hansen <dave.hansen@...el.com>,
        "hpa@...or.com" <hpa@...or.com>, KY Srinivasan <kys@...rosoft.com>,
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        Dexuan Cui <decui@...rosoft.com>,
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Subject: Re: [PATCH v5 06/14] x86/ioremap: Support hypervisor specified range
 to map as encrypted

On Fri, Feb 10, 2023 at 06:41:54PM +0000, Sean Christopherson wrote:
> Anyways, tying things back to the actual code being discussed, I vote against
> CC_ATTR_PARAVISOR.  Being able to trust device emulation is not unique to a
> paravisor.  A single flag also makes too many assumptions about what is trusted
> and thus should be accessed encrypted.

I'm not crazy about the alternative either: one flag per access type:
IO APIC, vTPM, and soon.

Soon this will become an unmaintainable zoo of different guest types
people want the kernel to support. I don't think I want that madness in
kernel proper.

-- 
Regards/Gruss,
    Boris.

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