From: Brijesh Singh <brijesh.singh@amd.com>
To: linux-kernel@vger.kernel.org, x86@kernel.org, kvm@vger.kernel.org
Cc: Thomas Gleixner <tglx@linutronix.de>, Borislav Petkov <bp@suse.de>,
        Joerg Roedel <joro@8bytes.org>, "Michael S . Tsirkin" <mst@redhat.com>,
        Paolo Bonzini <pbonzini@redhat.com>,
        =?UTF-8?q?=5C=22Radim=20Kr=C4=8Dm=C3=A1=C5=99=5C=22?= 
        <rkrcmar@redhat.com>,
        Tom Lendacky <thomas.lendacky@amd.com>,
        Brijesh Singh <brijesh.singh@amd.com>
Subject: [RFC Part2 PATCH v3 19/26] KVM: svm: Add support for SEV GUEST_STATUS command
Date: Mon, 24 Jul 2017 15:02:56 -0500
Message-Id: <20170724200303.12197-20-brijesh.singh@amd.com>
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The command is used for querying the SEV guest status.

Signed-off-by: Brijesh Singh <brijesh.singh@amd.com>
---
 arch/x86/kvm/svm.c | 38 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 38 insertions(+)

diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
index 7a77197..21f85e1 100644
--- a/arch/x86/kvm/svm.c
+++ b/arch/x86/kvm/svm.c
@@ -6024,6 +6024,40 @@ static int sev_launch_finish(struct kvm *kvm, struct kvm_sev_cmd *argp)
 	return ret;
 }
 
+static int sev_guest_status(struct kvm *kvm, struct kvm_sev_cmd *argp)
+{
+	struct kvm_sev_guest_status params;
+	struct sev_data_guest_status *data;
+	int ret;
+
+	if (!sev_guest(kvm))
+		return -ENOTTY;
+
+	if (copy_from_user(&params, (void *) argp->data,
+				sizeof(struct kvm_sev_guest_status)))
+		return -EFAULT;
+
+	data = kzalloc(sizeof(*data), GFP_KERNEL);
+	if (!data)
+		return -ENOMEM;
+
+	data->handle = sev_get_handle(kvm);
+	ret = sev_issue_cmd(kvm, SEV_CMD_GUEST_STATUS, data, &argp->error);
+	if (ret)
+		goto e_free;
+
+	params.policy = data->policy;
+	params.state = data->state;
+	params.handle = data->handle;
+
+	if (copy_to_user((void *) argp->data, &params,
+				sizeof(struct kvm_sev_guest_status)))
+		ret = -EFAULT;
+e_free:
+	kfree(data);
+	return ret;
+}
+
 static int svm_memory_encryption_op(struct kvm *kvm, void __user *argp)
 {
 	struct kvm_sev_cmd sev_cmd;
@@ -6055,6 +6089,10 @@ static int svm_memory_encryption_op(struct kvm *kvm, void __user *argp)
 		r = sev_launch_finish(kvm, &sev_cmd);
 		break;
 	}
+	case KVM_SEV_GUEST_STATUS: {
+		r = sev_guest_status(kvm, &sev_cmd);
+		break;
+	}
 	default:
 		break;
 	}
-- 
2.9.4