[RFC Part2 PATCH v3 19/26] KVM: svm: Add support for SEV GUEST_STATUS command

[Brijesh Singh]

The command is used for querying the SEV guest status.

Signed-off-by: Brijesh Singh <brijesh.si...@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