linux-kernel - Re: [RFC v2 28/32] x86/tdx: Make pages shared in ioremap()

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Date:   Mon, 10 May 2021 15:30:44 -0700
From:   Dave Hansen <dave.hansen@...el.com>
To:     "Kuppuswamy, Sathyanarayanan" 
        <sathyanarayanan.kuppuswamy@...ux.intel.com>,
        Andi Kleen <ak@...ux.intel.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Andy Lutomirski <luto@...nel.org>,
        Dan Williams <dan.j.williams@...el.com>,
        Tony Luck <tony.luck@...el.com>
Cc:     Kirill Shutemov <kirill.shutemov@...ux.intel.com>,
        Kuppuswamy Sathyanarayanan <knsathya@...nel.org>,
        Raj Ashok <ashok.raj@...el.com>,
        Sean Christopherson <seanjc@...gle.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [RFC v2 28/32] x86/tdx: Make pages shared in ioremap()

On 5/10/21 3:23 PM, Kuppuswamy, Sathyanarayanan wrote:
>>>>
>>>> -    if (!sev_active())
>>>> +    if (!sev_active() && !is_tdx_guest())
>>>>           return 0;
>>> I think it's time to come up with a real name for all of the code that's
>>> under: (sev_active() || is_tdx_guest()).
>>>
>>> "encrypted" isn't it, for sure.
>>
>> I called it protected_guest() in some other patches.
> 
> If you are also fine with above mentioned function name, I can include it
> in this series. Since we have many use cases of above condition, it will
> be useful define it as helper function.

FWIW, I think sev_active() has a horrible name.  Shouldn't that be
"is_sev_guest()"?  "sev_active()" could be read as "I'm a SEV host" or
"I'm a SEV guest" and "SEV is active".

protected_guest() seems fine to cover both, despite the horrid SEV
naming.  It'll actually be nice to banish it from appearing in many of
its uses. :)