[RFC PATCH v1 28/28] KVM: SVM: add command to query SEV API version

[Brijesh Singh]

Signed-off-by: Brijesh Singh <brijesh.singh@xxxxxxx>
---
 arch/x86/kvm/svm.c |   23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)

diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
index 4af195d..88b8f89 100644
--- a/arch/x86/kvm/svm.c
+++ b/arch/x86/kvm/svm.c
@@ -5779,6 +5779,25 @@ err_1:
 	return ret;
 }
 
+static int sev_api_version(int *psp_ret)
+{
+	int ret;
+	struct psp_data_status *status;
+
+	status = kzalloc(sizeof(*status), GFP_KERNEL);
+	if (!status)
+		return -ENOMEM;
+
+	ret = psp_platform_status(status, psp_ret);
+	if (ret)
+		goto err;
+
+	ret = (status->api_major << 8) | status->api_minor;
+err:
+	kfree(status);
+	return ret;
+}
+
 static int amd_sev_issue_cmd(struct kvm *kvm,
 			     struct kvm_sev_issue_cmd __user *user_data)
 {
@@ -5819,6 +5838,10 @@ static int amd_sev_issue_cmd(struct kvm *kvm,
 					&arg.ret_code);
 		break;
 	}
+	case KVM_SEV_API_VERSION: {
+		r = sev_api_version(&arg.ret_code);
+		break;
+	}
 	default:
 		break;
 	}