[RFC PATCH v1 25/28] KVM: SVM: add KVM_SEV_GUEST_STATUS command

[Brijesh Singh]

The command is used to query the SEV guest status.

For more information see [1], section 6.10

[1] http://support.amd.com/TechDocs/55766_SEV-KM%20API_Spec.pdf

Signed-off-by: Brijesh Singh <brijesh.si...@amd.com>
---
 arch/x86/kvm/svm.c |   41 +++++++++++++++++++++++++++++++++++++++++
 1 file changed, 41 insertions(+)

diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
index 60cc0f7..63e7d15 100644
--- a/arch/x86/kvm/svm.c
+++ b/arch/x86/kvm/svm.c
@@ -5570,6 +5570,42 @@ err_1:
        return ret;
 }
 
+static int sev_guest_status(struct kvm *kvm,
+                           struct kvm_sev_guest_status __user *argp,
+                           int *psp_ret)
+{
+       int ret;
+       struct kvm_sev_guest_status params;
+       struct psp_data_guest_status *status;
+
+       if (!kvm_sev_guest())
+               return -ENOTTY;
+
+       if (copy_from_user(&params, argp, sizeof(*argp)))
+               return -EFAULT;
+
+       status = kzalloc(sizeof(*status), GFP_KERNEL);
+       if (!status)
+               return -ENOMEM;
+
+       status->hdr.buffer_len = sizeof(*status);
+       status->handle = kvm_sev_handle();
+       ret = psp_guest_status(status, psp_ret);
+       if (ret) {
+               printk(KERN_ERR "SEV: GUEST_STATUS ret=%d (%#010x)\n",
+                       ret, *psp_ret);
+               goto err_1;
+       }
+       params.policy = status->policy;
+       params.state = status->state;
+
+       if (copy_to_user(argp, &params, sizeof(*argp)))
+               ret = -EFAULT;
+err_1:
+       kfree(status);
+       return ret;
+}
+
 static int amd_sev_issue_cmd(struct kvm *kvm,
                             struct kvm_sev_issue_cmd __user *user_data)
 {
@@ -5595,6 +5631,11 @@ static int amd_sev_issue_cmd(struct kvm *kvm,
                                        &arg.ret_code);
                break;
        }
+       case KVM_SEV_GUEST_STATUS: {
+               r = sev_guest_status(kvm, (void *)arg.opaque,
+                                       &arg.ret_code);
+               break;
+       }
        default:
                break;
        }

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