linux-kernel - Re: [PATCH v10 46/50] crypto: ccp: Add the SNP_{SET,GET}_EXT

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Date:   Mon, 16 Oct 2023 16:11:45 -0700
From:   Dionna Amalie Glaze <dionnaglaze@...gle.com>
To:     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,
        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,
        jarkko@...nel.org, ashish.kalra@....com, nikunj.dadhania@....com,
        pankaj.gupta@....com, liam.merwick@...cle.com,
        zhi.a.wang@...el.com, Brijesh Singh <brijesh.singh@....com>,
        Alexey Kardashevskiy <aik@....com>
Subject: Re: [PATCH v10 46/50] crypto: ccp: Add the SNP_{SET,GET}_EXT_CONFIG command

> +/**
> + * struct sev_data_snp_ext_config - system wide configuration value for SNP.
> + *
> + * @config_address: address of the struct sev_user_data_snp_config or 0 when
> + *             reported_tcb does not need to be updated.
> + * @certs_address: address of extended guest request certificate chain or
> + *              0 when previous certificate should be removed on SNP_SET_EXT_CONFIG.
> + * @certs_len: length of the certs
> + */
> +struct sev_user_data_ext_snp_config {
> +       __u64 config_address;           /* In */
> +       __u64 certs_address;            /* In */
> +       __u32 certs_len;                /* In */
> +} __packed;
> +

Can we add a generation number to this? Whenever user space sets the
certs blob it will invalidate the instance-specific certificates that
are settable in KVM.
The VMM will need to weave the instance-specific data with the new
certs installed at the machine level since we're not adding
interpretation of the cert blob to KVM.


-- 
-Dionna Glaze, PhD (she/her)