linux-kernel - Re: [PATCH] x86/mm/cpa: Generalize __set_memory_enc

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Date:   Wed, 23 Feb 2022 15:54:24 +0300
From:   "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
To:     Borislav Petkov <bp@...en8.de>
Cc:     Brijesh Singh <brijesh.singh@....com>, x86@...nel.org,
        linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
        linux-coco@...ts.linux.dev, Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Joerg Roedel <jroedel@...e.de>,
        Tom Lendacky <thomas.lendacky@....com>,
        "H. Peter Anvin" <hpa@...or.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Sean Christopherson <seanjc@...gle.com>,
        Andy Lutomirski <luto@...nel.org>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Peter Gonda <pgonda@...gle.com>,
        Peter Zijlstra <peterz@...radead.org>,
        David Rientjes <rientjes@...gle.com>,
        Michael Roth <michael.roth@....com>,
        Andi Kleen <ak@...ux.intel.com>
Subject: Re: [PATCH] x86/mm/cpa: Generalize __set_memory_enc_pgtable()

On Wed, Feb 23, 2022 at 01:38:03PM +0100, Borislav Petkov wrote:
> On Wed, Feb 23, 2022 at 03:25:08PM +0300, Kirill A. Shutemov wrote:
> > So far it is only success or failure. I used int and -EIO as failure.
> > bool is enough, but I don't see a reason not to use int.
> 
> bool it is.
> 
> ---
> From 8855bca859d8768ac04bfcf5b4aeb9cf3c69295a Mon Sep 17 00:00:00 2001
> From: Brijesh Singh <brijesh.singh@....com>
> Date: Tue, 22 Feb 2022 22:35:28 -0600
> Subject: [PATCH] x86/mm/cpa: Generalize __set_memory_enc_pgtable()
> 
> The kernel provides infrastructure to set or clear the encryption mask
> from the pages for AMD SEV, but TDX requires few tweaks.
> 
> - TDX and SEV have different requirements to the cache and TLB
>   flushing.
> 
> - TDX has own routine to notify VMM about page encryption status change.
> 
> Modify __set_memory_enc_pgtable() and make it flexible enough to cover
> both AMD SEV and Intel TDX. The AMD-specific behavior is isolated in
> callback under x86_platform_cc. TDX will provide own version of the

"under x86_platform.guest"

> callbacks.
> 
>   [ bp: Beat into submission. ]
> 
> Signed-off-by: Brijesh Singh <brijesh.singh@....com>
> Signed-off-by: Borislav Petkov <bp@...e.de>
> Link: https://lore.kernel.org/r/20220223043528.2093214-1-brijesh.singh@amd.com

Otherwise, LGTM:

Acked-by: Kirill A. Shutemov <kirill.shutemov@...ux.intel.com>


-- 
 Kirill A. Shutemov