KVM: SVM: Add support for SEV GUEST_STATUS command

Web:        https://git.kernel.org/torvalds/c/255d9e75e2549a5bc85c3606f5a80e8a0ef4d170
Commit:     255d9e75e2549a5bc85c3606f5a80e8a0ef4d170
Parent:     5bdb0e2fa45eb007a1cc630c6b520a638e60c1f6
Refname:    refs/heads/master
Author:     Brijesh Singh <[email protected]>
AuthorDate: Mon Dec 4 10:57:37 2017 -0600
Committer:  Brijesh Singh <[email protected]>
CommitDate: Mon Dec 4 13:33:13 2017 -0600

    KVM: SVM: Add support for SEV GUEST_STATUS command
    
    The command is used for querying the SEV guest information.
    
    Cc: Thomas Gleixner <[email protected]>
    Cc: Ingo Molnar <[email protected]>
    Cc: "H. Peter Anvin" <[email protected]>
    Cc: Paolo Bonzini <[email protected]>
    Cc: "Radim Krčmář" <[email protected]>
    Cc: Joerg Roedel <[email protected]>
    Cc: Borislav Petkov <[email protected]>
    Cc: Tom Lendacky <[email protected]>
    Cc: [email protected]
    Cc: [email protected]
    Cc: [email protected]
    Signed-off-by: Brijesh Singh <[email protected]>
    Reviewed-by: Borislav Petkov <[email protected]>
---
 arch/x86/kvm/svm.c | 33 +++++++++++++++++++++++++++++++++
 1 file changed, 33 insertions(+)

diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
index 6a8d81311e9d..f5da2753790d 100644
--- a/arch/x86/kvm/svm.c
+++ b/arch/x86/kvm/svm.c
@@ -6133,6 +6133,36 @@ 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_info *sev = &kvm->arch.sev_info;
+	struct kvm_sev_guest_status params;
+	struct sev_data_guest_status *data;
+	int ret;
+
+	if (!sev_guest(kvm))
+		return -ENOTTY;
+
+	data = kzalloc(sizeof(*data), GFP_KERNEL);
+	if (!data)
+		return -ENOMEM;
+
+	data->handle = sev->handle;
+	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 __user *)(uintptr_t)argp->data, &params, sizeof(params)))
+		ret = -EFAULT;
+e_free:
+	kfree(data);
+	return ret;
+}
+
 static int svm_mem_enc_op(struct kvm *kvm, void __user *argp)
 {
 	struct kvm_sev_cmd sev_cmd;
@@ -6162,6 +6192,9 @@ static int svm_mem_enc_op(struct kvm *kvm, void __user *argp)
 	case KVM_SEV_LAUNCH_FINISH:
 		r = sev_launch_finish(kvm, &sev_cmd);
 		break;
+	case KVM_SEV_GUEST_STATUS:
+		r = sev_guest_status(kvm, &sev_cmd);
+		break;
 	default:
 		r = -EINVAL;
 		goto out;
--
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