linux-kernel - Re: [PATCH 19/26] x86/tdx: Make pages shared in ioremap()

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Date:   Wed, 29 Dec 2021 02:33:11 +0300
From:   "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
To:     Borislav Petkov <bp@...en8.de>
Cc:     "Kirill A. Shutemov" <kirill@...temov.name>,
        Dave Hansen <dave.hansen@...el.com>,
        Tom Lendacky <thomas.lendacky@....com>, tglx@...utronix.de,
        mingo@...hat.com, luto@...nel.org, peterz@...radead.org,
        sathyanarayanan.kuppuswamy@...ux.intel.com, aarcange@...hat.com,
        ak@...ux.intel.com, dan.j.williams@...el.com, david@...hat.com,
        hpa@...or.com, jgross@...e.com, jmattson@...gle.com,
        joro@...tes.org, jpoimboe@...hat.com, knsathya@...nel.org,
        pbonzini@...hat.com, sdeep@...are.com, seanjc@...gle.com,
        tony.luck@...el.com, vkuznets@...hat.com, wanpengli@...cent.com,
        x86@...nel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 19/26] x86/tdx: Make pages shared in ioremap()

On Tue, Dec 28, 2021 at 07:39:46PM +0100, Borislav Petkov wrote:
> But my point about removing the outer check is bull - you need the
> TDX/SEV checks too to figure out which mask to use.
> 
> So, reading Tom's latest email, having
> 
> 	cc_pgprot_encrypted(prot)
> 
> and
> 	cc_pgprot_decrypted(prot)
> 
> in cc_platform.c and which hide all that logic inside doesn't sound like
> a bad idea. And cc_platform.c already looks at sme_me_mask and we do
> that there for the early path so I guess that's probably halfway fine...

Okay, will go this path.

-- 
 Kirill A. Shutemov