From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pf0-f200.google.com (mail-pf0-f200.google.com [209.85.192.200]) by kanga.kvack.org (Postfix) with ESMTP id 1988E6B03BE for ; Thu, 2 Mar 2017 10:18:56 -0500 (EST) Received: by mail-pf0-f200.google.com with SMTP id u62so84871599pfk.1 for ; Thu, 02 Mar 2017 07:18:56 -0800 (PST) Received: from NAM03-BY2-obe.outbound.protection.outlook.com (mail-by2nam03on0060.outbound.protection.outlook.com. [104.47.42.60]) by mx.google.com with ESMTPS id t5si7667595pgj.171.2017.03.02.07.18.55 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Thu, 02 Mar 2017 07:18:55 -0800 (PST) Subject: [RFC PATCH v2 31/32] kvm: svm: Add support for SEV LAUNCH_MEASURE command From: Brijesh Singh Date: Thu, 2 Mar 2017 10:18:40 -0500 Message-ID: <148846791999.2349.16796756305829956919.stgit@brijesh-build-machine> In-Reply-To: <148846752022.2349.13667498174822419498.stgit@brijesh-build-machine> References: <148846752022.2349.13667498174822419498.stgit@brijesh-build-machine> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org List-ID: To: simon.guinot@sequanux.org, linux-efi@vger.kernel.org, brijesh.singh@amd.com, kvm@vger.kernel.org, rkrcmar@redhat.com, matt@codeblueprint.co.uk, linux-pci@vger.kernel.org, linus.walleij@linaro.org, gary.hook@amd.com, linux-mm@kvack.org, paul.gortmaker@windriver.com, hpa@zytor.com, cl@linux.com, dan.j.williams@intel.com, aarcange@redhat.com, sfr@canb.auug.org.au, andriy.shevchenko@linux.intel.com, herbert@gondor.apana.org.au, bhe@redhat.com, xemul@parallels.com, joro@8bytes.org, x86@kernel.org, peterz@infradead.org, piotr.luc@intel.com, mingo@redhat.com, msalter@redhat.com, ross.zwisler@linux.intel.com, bp@suse.de, dyoung@redhat.com, thomas.lendacky@amd.com, jroedel@suse.de, keescook@chromium.org, arnd@arndb.de, toshi.kani@hpe.com, mathieu.desnoyers@efficios.com, luto@kernel.org, devel@linuxdriverproject.org, bhelgaas@google.com, tglx@linutronix.de, mchehab@kernel.org, iamjoonsoo.kim@lge.com, labbott@fedoraproject.org, tony.luck@intel.com, alexandre.bounine@idt.com, kuleshovmail@gmail.com, linux-kernel@vger.kernel.org, mcgrof@kernel.org, mst@redhat.com, linux-crypto@vger.kernel.org, tj@kernel.org, pbonzini@redhat.com, akpm@linux-foundation.org, davem@davemloft.net The command is used to retrieve the measurement of memory encrypted through the LAUNCH_UPDATE_DATA command. This measurement can be used for attestation purposes. Signed-off-by: Brijesh Singh --- arch/x86/kvm/svm.c | 52 ++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 52 insertions(+) diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c index 64899ed..13996d6 100644 --- a/arch/x86/kvm/svm.c +++ b/arch/x86/kvm/svm.c @@ -6141,6 +6141,54 @@ static int sev_dbg_encrypt(struct kvm *kvm, struct kvm_sev_cmd *argp) return ret; } +static int sev_launch_measure(struct kvm *kvm, struct kvm_sev_cmd *argp) +{ + int ret; + void *addr = NULL; + struct kvm_sev_launch_measure params; + struct sev_data_launch_measure *data; + + if (!sev_guest(kvm)) + return -ENOTTY; + + if (copy_from_user(¶ms, (void *)argp->data, + sizeof(struct kvm_sev_launch_measure))) + return -EFAULT; + + data = kzalloc(sizeof(*data), GFP_KERNEL); + if (!data) + return -ENOMEM; + + if (params.address && params.length) { + ret = -EFAULT; + addr = kzalloc(params.length, GFP_KERNEL); + if (!addr) + goto err_1; + data->address = __psp_pa(addr); + data->length = params.length; + } + + data->handle = sev_get_handle(kvm); + ret = sev_issue_cmd(kvm, SEV_CMD_LAUNCH_MEASURE, data, &argp->error); + + /* copy the measurement to userspace */ + if (addr && + copy_to_user((void *)params.address, addr, params.length)) { + ret = -EFAULT; + goto err_1; + } + + params.length = data->length; + if (copy_to_user((void *)argp->data, ¶ms, + sizeof(struct kvm_sev_launch_measure))) + ret = -EFAULT; + + kfree(addr); +err_1: + kfree(data); + return ret; +} + static int amd_memory_encryption_cmd(struct kvm *kvm, void __user *argp) { int r = -ENOTTY; @@ -6176,6 +6224,10 @@ static int amd_memory_encryption_cmd(struct kvm *kvm, void __user *argp) r = sev_dbg_encrypt(kvm, &sev_cmd); break; } + case KVM_SEV_LAUNCH_MEASURE: { + r = sev_launch_measure(kvm, &sev_cmd); + break; + } default: break; } -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org