linux-kernel - Re: [PATCH RFC v7 37/64] KVM: SVM: Add KVM_SNP

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Message-ID: <Y9Lv1HjD1FWdH9jg@kernel.org>
Date:   Thu, 26 Jan 2023 21:25:40 +0000
From:   Jarkko Sakkinen <jarkko@...nel.org>
To:     "Kalra, Ashish" <ashish.kalra@....com>
Cc:     Michael Roth <michael.roth@....com>, 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, wanpengli@...cent.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, bp@...en8.de,
        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, harald@...fian.com,
        Brijesh Singh <brijesh.singh@....com>,
        Pavan Kumar Paluri <papaluri@....com>
Subject: Re: [PATCH RFC v7 37/64] KVM: SVM: Add KVM_SNP_INIT command

On Mon, Jan 23, 2023 at 04:49:14PM -0600, Kalra, Ashish wrote:
> There was an early firmware issue on Genoa which supported only SNP_INIT or
> SEV_INIT, but this issue is resolved now.
> 
> Now, the main constraints are that SNP_INIT is always required before
> SEV_INIT in case we want to launch SNP guests. In other words, if only
> SEV_INIT is done on a platform which supports SNP we won't be able to launch
> SNP guests after that.
> 
> So once we have RMP table setup (in BIOS) we will always do an SNP_INIT and
> SEV_INIT will be ideally done only (on demand) when an SEV guest is
> launched.

OK, thanks for the clarification!

BR, Jarkko