linux-kernel - Re: [PATCH v8 12/40] x86/sev: Add helper for validating pages in early enc attribute changes

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Date:   Tue, 4 Jan 2022 09:33:24 -0600
From:   Brijesh Singh <brijesh.singh@....com>
To:     Borislav Petkov <bp@...en8.de>
Cc:     brijesh.singh@....com, x86@...nel.org,
        linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
        linux-efi@...r.kernel.org, platform-driver-x86@...r.kernel.org,
        linux-coco@...ts.linux.dev, linux-mm@...ck.org,
        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>, Ard Biesheuvel <ardb@...nel.org>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Sean Christopherson <seanjc@...gle.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Jim Mattson <jmattson@...gle.com>,
        Andy Lutomirski <luto@...nel.org>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Sergio Lopez <slp@...hat.com>, Peter Gonda <pgonda@...gle.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>,
        David Rientjes <rientjes@...gle.com>,
        Dov Murik <dovmurik@...ux.ibm.com>,
        Tobin Feldman-Fitzthum <tobin@....com>,
        Michael Roth <michael.roth@....com>,
        Vlastimil Babka <vbabka@...e.cz>,
        "Kirill A . Shutemov" <kirill@...temov.name>,
        Andi Kleen <ak@...ux.intel.com>,
        "Dr . David Alan Gilbert" <dgilbert@...hat.com>,
        tony.luck@...el.com, marcorr@...gle.com,
        sathyanarayanan.kuppuswamy@...ux.intel.com
Subject: Re: [PATCH v8 12/40] x86/sev: Add helper for validating pages in
 early enc attribute changes



On 12/23/21 5:50 AM, Borislav Petkov wrote:
>> While at it, add a helper snp_prep_memory() that can be used outside
>> the sev specific files to change the page state for a specified memory
> 
> "outside of the sev specific"? What is that trying to say?
> 
> /me goes and looks at the whole patchset...
> 
> Right, so that is used only in probe_roms(). So that should say:
> 
> "Add a helper ... which will be used in probe_roms(), in a later patch."
> 

Currently the helper is used for the probe_roms() only but it can be 
used by others in future. I will go ahead and spell out saying that it 
is for the probe_roms().


> 
> Yeah, looking at this again, I don't really like this multiplexing.
> Let's do this instead, diff ontop:
> 

thanks, I will apply your diff.