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Fri, 20 Mar 2020 19:13:09 +0000 Cc: brijesh.singh@amd.com Subject: Re: [PATCH] KVM: SVM: document KVM_MEM_ENCRYPT_OP, let userspace detect if SEV is available To: Paolo Bonzini , linux-kernel@vger.kernel.org, kvm@vger.kernel.org References: <20200320174245.5220-1-pbonzini@redhat.com> From: Brijesh Singh Message-ID: Date: Fri, 20 Mar 2020 14:14:19 -0500 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.14; rv:68.0) Gecko/20100101 Thunderbird/68.5.0 In-Reply-To: <20200320174245.5220-1-pbonzini@redhat.com> Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit Content-Language: en-US X-ClientProxiedBy: SN4PR0501CA0024.namprd05.prod.outlook.com (2603:10b6:803:40::37) To CY4PR12MB1926.namprd12.prod.outlook.com (2603:10b6:903:11b::11) MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 Received: from Brijeshs-MacBook-Pro.local (165.204.77.11) by SN4PR0501CA0024.namprd05.prod.outlook.com (2603:10b6:803:40::37) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.2835.12 via Frontend Transport; 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X-Microsoft-Antispam-Message-Info: 88ON0HfLkkNTVm61RWpiKni4qhDLtmPTuW5V6m1ikDYiKDmf+SE9j0j/xf08YTkSW41n905cvr1unnXRWl89HejSdF+rv4KS2FQNFO9o7KCX0LMLIZeADhOMmrxfLbfidv14QLdaV/H0owPu0ZCXnLBwalC5CeC08kYIM3Mv33HcS0TeMSSfCAwRhPnvQhUIgnXAkP9pIspjiKzb1L/0EEVhf7B2l5Xl/OhAg64T1djxZvCM+CiD8NEi57S4kYLnlojaeOdCHiOnCeT3Dm4ynLVWQSqrrTJj7lkFsFd4F75hnw1+jd3gT1agczFWQzzTB1i1WxBj5+b4iyuNvp7xWUekFg0cLskdi1JFdApST1rhDdXA+xIa5umsttMH1PVM4W2az1UQGOl8f9OczK8qWzu9gMY0J7SQXmOQ7ycKq3LHn9quGmBwlzart+owjY1X X-MS-Exchange-AntiSpam-MessageData: fGgF5qZof3t5ZFMqP6+yjgNNNbJ0DA2+iqw3pVUEIGW1S0Z8VB0Ky/BWMHPOv44Zj+aandLtwDLhlisW6hybT5ytUyQNqqi0TsQcWzqZ4CHgWEBOaYh61qtym+FZaAxntzywfSD6eIh28VUYpXTLkg== X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-Network-Message-Id: 7668df3a-f9ee-40d1-9e80-08d7cd02ba11 X-MS-Exchange-CrossTenant-OriginalArrivalTime: 20 Mar 2020 19:13:09.4718 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: eb3R7EMRrXnX9rPTNASL+ou24m5eH2TSTmtdxsxaz2xXi1YWV1Apwn1UpTzzsZEXDVJb/KUH9Vc2OriLO2zP4A== X-MS-Exchange-Transport-CrossTenantHeadersStamped: CY4PR12MB1525 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 3/20/20 12:42 PM, Paolo Bonzini wrote: > Userspace has no way to query if SEV has been disabled with the > sev module parameter of kvm-amd.ko. Actually it has one, but it > is a hack: do ioctl(KVM_MEM_ENCRYPT_OP, NULL) and check if it > returns EFAULT. Make it a little nicer by returning zero for > SEV enabled and NULL argument, and while at it document the > ioctl arguments. > > Cc: Brijesh Singh > Signed-off-by: Paolo Bonzini thanks Reviewed-by: Brijesh Singh