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References: <20230220183847.59159-1-michael.roth@amd.com> <20230220183847.59159-55-michael.roth@amd.com>
 <20230302020245.00006f57@gmail.com>
In-Reply-To: <20230302020245.00006f57@gmail.com>
From:   Dionna Amalie Glaze <dionnaglaze@google.com>
Date:   Wed, 1 Mar 2023 17:41:11 -0800
Message-ID: <CAAH4kHY6jm9PHjuGj18eyCC8H4oksuNkVL=igAh4P4BTsKs2xA@mail.gmail.com>
Subject: Re: [PATCH RFC v8 54/56] x86/sev: Add KVM commands for instance certs
To:     Zhi Wang <zhi.wang.linux@gmail.com>
Cc:     Michael Roth <michael.roth@amd.com>, kvm@vger.kernel.org,
        linux-coco@lists.linux.dev, linux-mm@kvack.org,
        linux-crypto@vger.kernel.org, x86@kernel.org,
        linux-kernel@vger.kernel.org, tglx@linutronix.de, mingo@redhat.com,
        jroedel@suse.de, thomas.lendacky@amd.com, hpa@zytor.com,
        ardb@kernel.org, pbonzini@redhat.com, seanjc@google.com,
        vkuznets@redhat.com, jmattson@google.com, luto@kernel.org,
        dave.hansen@linux.intel.com, slp@redhat.com, pgonda@google.com,
        peterz@infradead.org, srinivas.pandruvada@linux.intel.com,
        rientjes@google.com, dovmurik@linux.ibm.com, tobin@ibm.com,
        bp@alien8.de, vbabka@suse.cz, kirill@shutemov.name,
        ak@linux.intel.com, tony.luck@intel.com, marcorr@google.com,
        sathyanarayanan.kuppuswamy@linux.intel.com, alpergun@google.com,
        dgilbert@redhat.com, jarkko@kernel.org, ashish.kalra@amd.com,
        nikunj.dadhania@amd.com
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Precedence: bulk

> > @@ -2089,6 +2089,7 @@ static void *snp_context_create(struct kvm *kvm, struct kvm_sev_cmd *argp)
> >               goto e_free;
> >
> >       sev->snp_certs_data = certs_data;
> > +     sev->snp_certs_len = 0;
> >
> >       return context;
> >
>
> Better to move the fix to PATCH 45.
>

This part isn't a fix, but part of the implementation since
snp_certs_len is added in this patch here

> > diff --git a/arch/x86/kvm/svm/svm.h b/arch/x86/kvm/svm/svm.h
> > index 221b38d3c845..dced46559508 100644
> > --- a/arch/x86/kvm/svm/svm.h
> > +++ b/arch/x86/kvm/svm/svm.h
> > @@ -94,6 +94,7 @@ struct kvm_sev_info {
> >       u64 snp_init_flags;
> >       void *snp_context;      /* SNP guest context page */
> >       void *snp_certs_data;
> > +     unsigned int snp_certs_len; /* Size of instance override for certs */
> >       struct mutex guest_req_lock; /* Lock for guest request handling */
> >
> >       u64 sev_features;       /* Features set at VMSA creation */


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