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b=VmaDkONgwsP145+fq81o0/J9Qeig2H3wN+K1BJIBdKyMJl6W1/ptJf0z9ByMQZDRrBWsplCFET57lu6p+f6qAmKb6nxXDXmNP+klg72vqIicrC3sfuy/tfPLvPMF1k4k6MsuaByxqMTtv7X4idfZK5Pf8ul544sJKW9BHrVdkmY= Authentication-Results: dkim=none (message not signed) header.d=none;dmarc=none action=none header.from=amd.com; Received: from BL3PR12MB9049.namprd12.prod.outlook.com (2603:10b6:208:3b8::21) by CY5PR12MB6453.namprd12.prod.outlook.com (2603:10b6:930:37::11) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.8746.30; Mon, 19 May 2025 19:10:43 +0000 Received: from BL3PR12MB9049.namprd12.prod.outlook.com ([fe80::c170:6906:9ef3:ecef]) by BL3PR12MB9049.namprd12.prod.outlook.com ([fe80::c170:6906:9ef3:ecef%5]) with mapi id 15.20.8746.029; Mon, 19 May 2025 19:10:43 +0000 Message-ID: <96529b17-5a1d-498c-9bc3-229c8ed484b8@amd.com> Date: Mon, 19 May 2025 14:10:40 -0500 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v3] KVM: SEV: Disable SEV-SNP support on initialization failure To: "Gupta, Pankaj" , seanjc@google.com, pbonzini@redhat.com, tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, dave.hansen@linux.intel.com, thomas.lendacky@amd.com, shuah@kernel.org, prsampat@amd.com Cc: pgonda@google.com, nikunj@amd.com, michael.roth@amd.com, sraithal@amd.com, linux-kernel@vger.kernel.org, x86@kernel.org, kvm@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-coco@lists.linux.dev References: <20250512221634.12045-1-Ashish.Kalra@amd.com> <25fbb9a5-496a-4c70-bd54-2a285391fca5@amd.com> Content-Language: en-US From: "Kalra, Ashish" In-Reply-To: <25fbb9a5-496a-4c70-bd54-2a285391fca5@amd.com> Content-Type: text/plain; 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However, >> the KVM capability may continue to advertise support for it. >> >> The platform may have SNP enabled but if SNP_INIT fails then SNP is >> not supported by KVM. >> >> During KVM module initialization query the SNP platform status to obtain >> the SNP initialization state and use it as an additional condition to >> determine support for SEV-SNP. >> >> Co-developed-by: Sean Christopherson >> Signed-off-by: Sean Christopherson >> Co-developed-by: Pratik R. Sampat >> Signed-off-by: Pratik R. Sampat >> Reviewed-by: Tom Lendacky >> Signed-off-by: Ashish Kalra > > LGTM > > Reviewed-by: Pankaj Gupta > Can you please pull in this patch. Thanks, Ashish >> --- >>   arch/x86/kvm/svm/sev.c | 44 +++++++++++++++++++++++++++++++++--------- >>   1 file changed, 35 insertions(+), 9 deletions(-) >> >> diff --git a/arch/x86/kvm/svm/sev.c b/arch/x86/kvm/svm/sev.c >> index dea9480b9ff6..8c3b12e3de8c 100644 >> --- a/arch/x86/kvm/svm/sev.c >> +++ b/arch/x86/kvm/svm/sev.c >> @@ -2935,6 +2935,33 @@ void __init sev_set_cpu_caps(void) >>       } >>   } >>   +static bool is_sev_snp_initialized(void) >> +{ >> +    struct sev_user_data_snp_status *status; >> +    struct sev_data_snp_addr buf; >> +    bool initialized = false; >> +    int ret, error = 0; >> + >> +    status = snp_alloc_firmware_page(GFP_KERNEL | __GFP_ZERO); >> +    if (!status) >> +        return false; >> + >> +    buf.address = __psp_pa(status); >> +    ret = sev_do_cmd(SEV_CMD_SNP_PLATFORM_STATUS, &buf, &error); >> +    if (ret) { >> +        pr_err("SEV: SNP_PLATFORM_STATUS failed ret=%d, fw_error=%d (%#x)\n", >> +               ret, error, error); >> +        goto out; >> +    } >> + >> +    initialized = !!status->state; >> + >> +out: >> +    snp_free_firmware_page(status); >> + >> +    return initialized; >> +} >> + >>   void __init sev_hardware_setup(void) >>   { >>       unsigned int eax, ebx, ecx, edx, sev_asid_count, sev_es_asid_count; >> @@ -3039,6 +3066,14 @@ void __init sev_hardware_setup(void) >>       sev_snp_supported = sev_snp_enabled && cc_platform_has(CC_ATTR_HOST_SEV_SNP); >>     out: >> +    if (sev_enabled) { >> +        init_args.probe = true; >> +        if (sev_platform_init(&init_args)) >> +            sev_supported = sev_es_supported = sev_snp_supported = false; >> +        else if (sev_snp_supported) >> +            sev_snp_supported = is_sev_snp_initialized(); >> +    } >> + >>       if (boot_cpu_has(X86_FEATURE_SEV)) >>           pr_info("SEV %s (ASIDs %u - %u)\n", >>               sev_supported ? min_sev_asid <= max_sev_asid ? "enabled" : >> @@ -3065,15 +3100,6 @@ void __init sev_hardware_setup(void) >>       sev_supported_vmsa_features = 0; >>       if (sev_es_debug_swap_enabled) >>           sev_supported_vmsa_features |= SVM_SEV_FEAT_DEBUG_SWAP; >> - >> -    if (!sev_enabled) >> -        return; >> - >> -    /* >> -     * Do both SNP and SEV initialization at KVM module load. >> -     */ >> -    init_args.probe = true; >> -    sev_platform_init(&init_args); >>   } >>     void sev_hardware_unsetup(void) >