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

From: Brijesh Singh
Date: Mon Aug 22 2016 - 19:29:30 EST


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.singh@xxxxxxx>
---
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;
}