[Qemu-devel] [RFC PATCH v1 06/10] KVM: SVM: Add KVM_SEV_RECEIVE_FINISH command

[Singh, Brijesh]

The command finalize the guest receiving process and make the SEV guest
ready for the execution.

Cc: Thomas Gleixner <address@hidden>
Cc: Ingo Molnar <address@hidden>
Cc: "H. Peter Anvin" <address@hidden>
Cc: Paolo Bonzini <address@hidden>
Cc: "Radim Krčmář" <address@hidden>
Cc: Joerg Roedel <address@hidden>
Cc: Borislav Petkov <address@hidden>
Cc: Tom Lendacky <address@hidden>
Cc: address@hidden
Cc: address@hidden
Cc: address@hidden
Signed-off-by: Brijesh Singh <address@hidden>
---
 .../virtual/kvm/amd-memory-encryption.rst     |  8 +++++++
 arch/x86/kvm/svm.c                            | 23 +++++++++++++++++++
 2 files changed, 31 insertions(+)

diff --git a/Documentation/virtual/kvm/amd-memory-encryption.rst 
b/Documentation/virtual/kvm/amd-memory-encryption.rst
index b9c3dc02f344..72c45f93abd7 100644
--- a/Documentation/virtual/kvm/amd-memory-encryption.rst
+++ b/Documentation/virtual/kvm/amd-memory-encryption.rst
@@ -346,6 +346,14 @@ Returns: 0 on success, -negative on error
                 __u32 trans_len;
         };
 
+15. KVM_SEV_RECEIVE_FINISH
+------------------------
+
+After completion of the migration flow, the KVM_SEV_RECEIVE_FINISH command can 
be
+issued by the hypervisor to make the guest ready for the execution.
+
+Returns: 0 on success, -negative on error
+
 References
 ==========
 
diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
index c81cac09c5af..74b57ab742ad 100644
--- a/arch/x86/kvm/svm.c
+++ b/arch/x86/kvm/svm.c
@@ -7350,6 +7350,26 @@ static int sev_receive_update_data(struct kvm *kvm, 
struct kvm_sev_cmd *argp)
        return ret;
 }
 
+static int sev_receive_finish(struct kvm *kvm, struct kvm_sev_cmd *argp)
+{
+       struct kvm_sev_info *sev = &to_kvm_svm(kvm)->sev_info;
+       struct sev_data_receive_finish *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_RECEIVE_FINISH, data, &argp->error);
+
+       kfree(data);
+       return ret;
+}
+
 static int svm_mem_enc_op(struct kvm *kvm, void __user *argp)
 {
        struct kvm_sev_cmd sev_cmd;
@@ -7406,6 +7426,9 @@ static int svm_mem_enc_op(struct kvm *kvm, void __user 
*argp)
        case KVM_SEV_RECEIVE_UPDATE_DATA:
                r = sev_receive_update_data(kvm, &sev_cmd);
                break;
+       case KVM_SEV_RECEIVE_FINISH:
+               r = sev_receive_finish(kvm, &sev_cmd);
+               break;
        default:
                r = -EINVAL;
                goto out;
-- 
2.17.1