linux-kernel - Re: [PATCH RFC v7 40/64] KVM: SVM: Add KVM_SEV_SNP_LAUNCH

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Message-ID: <0a8727f0-d3fd-f842-e050-bbfbb72b5728@amd.com>
Date:   Wed, 11 Jan 2023 17:18:16 -0600
From:   "Kalra, Ashish" <ashish.kalra@....com>
To:     Sabin Rapan <sabrapan@...zon.com>,
        Michael Roth <michael.roth@....com>, kvm@...r.kernel.org
Cc:     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, jarkko@...nel.org, harald@...fian.com,
        Brijesh Singh <brijesh.singh@....com>
Subject: Re: [PATCH RFC v7 40/64] KVM: SVM: Add KVM_SEV_SNP_LAUNCH_FINISH
 command

On 1/11/2023 7:27 AM, Sabin Rapan wrote:
> 
> 
> On 14.12.2022 21:40, Michael Roth wrote:
>> +static int snp_launch_update_vmsa(struct kvm *kvm, struct kvm_sev_cmd *argp)
>> +{
>> +       struct kvm_sev_info *sev = &to_kvm_svm(kvm)->sev_info;
>> +       struct sev_data_snp_launch_update data = {};
>> +       int i, ret;
>> +
>> +       data.gctx_paddr = __psp_pa(sev->snp_context);
>> +       data.page_type = SNP_PAGE_TYPE_VMSA;
>> +
>> +       for (i = 0; i < kvm->created_vcpus; i++) {
> 
> Should be replaced with kvm_for_each_vcpu() as it was done for
> sev_launch_update_vmsa() in c36b16d29f3a ("KVM: SVM: Use online_vcpus,
> not created_vcpus, to iterate over vCPUs").
> Prevents accessing uninitialized data in struct vcpu_svm.

Yes, fixed this one.

Thanks,
Ashish