linux-kernel - Re: [PATCH RFC v9 07/51] x86/sev: Add the host SEV-SNP initialization support

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Message-ID: <20230621155912.GKZJMeUHzKCFchhE5v@fat_crate.local>
Date:   Wed, 21 Jun 2023 17:59:38 +0200
From:   Borislav Petkov <bp@...en8.de>
To:     Dave Hansen <dave.hansen@...el.com>,
        Michael Roth <michael.roth@....com>
Cc:     kvm@...r.kernel.org, linux-coco@...ts.linux.dev,
        linux-mm@...ck.org, linux-crypto@...r.kernel.org, x86@...nel.org,
        linux-kernel@...r.kernel.org, tglx@...utronix.de, mingo@...hat.com,
        jroedel@...e.de, thomas.lendacky@....com, hpa@...or.com,
        ardb@...nel.org, pbonzini@...hat.com, seanjc@...gle.com,
        vkuznets@...hat.com, jmattson@...gle.com, luto@...nel.org,
        dave.hansen@...ux.intel.com, slp@...hat.com, pgonda@...gle.com,
        peterz@...radead.org, srinivas.pandruvada@...ux.intel.com,
        rientjes@...gle.com, dovmurik@...ux.ibm.com, tobin@....com,
        vbabka@...e.cz, kirill@...temov.name, ak@...ux.intel.com,
        tony.luck@...el.com, marcorr@...gle.com,
        sathyanarayanan.kuppuswamy@...ux.intel.com, alpergun@...gle.com,
        dgilbert@...hat.com, jarkko@...nel.org, ashish.kalra@....com,
        nikunj.dadhania@....com, liam.merwick@...cle.com,
        zhi.a.wang@...el.com, Brijesh Singh <brijesh.singh@....com>
Subject: Re: [PATCH RFC v9 07/51] x86/sev: Add the host SEV-SNP
 initialization support

On Wed, Jun 21, 2023 at 07:31:34AM -0700, Dave Hansen wrote:
> Yep, there's the hardware side and then there are fun nuggets like using
> mem= and then doing a software-only hot-add later after boot.

Ah, right, Mike, I think we need to check whether mem= has any effect on
SNP.

> Also, if the hardware doesn't support any kind of hotplug, it would be
> great to point to the place in the spec where it says that.

I honestly don't know. But I can't recall ever hearing about hardware
memory hotplug so something worth to check too.

-- 
Regards/Gruss,
    Boris.

https://people.kernel.org/tglx/notes-about-netiquette