linux-kernel - Re: [PATCH] x86/mm/ptdump: display page encryption state

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Date:   Wed, 20 Apr 2022 07:30:01 -0700
From:   Dave Hansen <dave.hansen@...el.com>
To:     Mike Rapoport <rppt@...nel.org>
Cc:     Borislav Petkov <bp@...en8.de>, Andy Lutomirski <luto@...nel.org>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        "H. Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...hat.com>,
        Mike Rapoport <rppt@...ux.ibm.com>,
        Thomas Gleixner <tglx@...utronix.de>, x86@...nel.org,
        linux-kernel@...r.kernel.org,
        "Shutemov, Kirill" <kirill.shutemov@...el.com>,
        Kuppuswamy Sathyanarayanan 
        <sathyanarayanan.kuppuswamy@...ux.intel.com>
Subject: Re: [PATCH] x86/mm/ptdump: display page encryption state

On 4/20/22 00:17, Mike Rapoport wrote:
>> _PAGE_ENC is AMD-specific. Could we do this with a new generic "cc_"
>> function, maybe cc_is_enc()?
>>
>> Something like this would (I think) work for both SEV and TDX:
>>
>> bool cc_is_enc(u64 prot)
>> {
>> 	return cc_mkdec(prot) != prot;
>> }
> It works for SEV. I can repost with this and you'll confirm it works on
> TDX?

I don't have a TDX setup handy, but Kirill certainly does.  I'm sure
he'd be happy to give you a tested-by.