Commit 5569e2e7 authored by Steve Rutherford's avatar Steve Rutherford Committed by Paolo Bonzini

KVM: SVM: Add support for KVM_SEV_SEND_CANCEL command

After completion of SEND_START, but before SEND_FINISH, the source VMM can
issue the SEND_CANCEL command to stop a migration. This is necessary so
that a cancelled migration can restart with a new target later.
Reviewed-by: default avatarNathan Tempelman <natet@google.com>
Reviewed-by: default avatarBrijesh Singh <brijesh.singh@amd.com>
Signed-off-by: default avatarSteve Rutherford <srutherford@google.com>
Message-Id: <20210412194408.2458827-1-srutherford@google.com>
Signed-off-by: default avatarPaolo Bonzini <pbonzini@redhat.com>
parent fddecf6a
......@@ -356,6 +356,15 @@ issued by the hypervisor to delete the encryption context.
Returns: 0 on success, -negative on error
14. KVM_SEV_SEND_CANCEL
------------------------
After completion of SEND_START, but before SEND_FINISH, the source VMM can issue the
SEND_CANCEL command to stop a migration. This is necessary so that a cancelled
migration can restart with a new target later.
Returns: 0 on success, -negative on error
References
==========
......
......@@ -1377,6 +1377,26 @@ static int sev_send_finish(struct kvm *kvm, struct kvm_sev_cmd *argp)
return ret;
}
static int sev_send_cancel(struct kvm *kvm, struct kvm_sev_cmd *argp)
{
struct kvm_sev_info *sev = &to_kvm_svm(kvm)->sev_info;
struct sev_data_send_cancel *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_SEND_CANCEL, data, &argp->error);
kfree(data);
return ret;
}
int svm_mem_enc_op(struct kvm *kvm, void __user *argp)
{
struct kvm_sev_cmd sev_cmd;
......@@ -1448,6 +1468,9 @@ int svm_mem_enc_op(struct kvm *kvm, void __user *argp)
case KVM_SEV_SEND_FINISH:
r = sev_send_finish(kvm, &sev_cmd);
break;
case KVM_SEV_SEND_CANCEL:
r = sev_send_cancel(kvm, &sev_cmd);
break;
default:
r = -EINVAL;
goto out;
......
......@@ -129,6 +129,7 @@ static int sev_cmd_buffer_len(int cmd)
case SEV_CMD_DOWNLOAD_FIRMWARE: return sizeof(struct sev_data_download_firmware);
case SEV_CMD_GET_ID: return sizeof(struct sev_data_get_id);
case SEV_CMD_ATTESTATION_REPORT: return sizeof(struct sev_data_attestation_report);
case SEV_CMD_SEND_CANCEL: return sizeof(struct sev_data_send_cancel);
default: return 0;
}
......
......@@ -73,6 +73,7 @@ enum sev_cmd {
SEV_CMD_SEND_UPDATE_DATA = 0x041,
SEV_CMD_SEND_UPDATE_VMSA = 0x042,
SEV_CMD_SEND_FINISH = 0x043,
SEV_CMD_SEND_CANCEL = 0x044,
/* Guest migration commands (incoming) */
SEV_CMD_RECEIVE_START = 0x050,
......@@ -392,6 +393,15 @@ struct sev_data_send_finish {
u32 handle; /* In */
} __packed;
/**
* struct sev_data_send_cancel - SEND_CANCEL command parameters
*
* @handle: handle of the VM to process
*/
struct sev_data_send_cancel {
u32 handle; /* In */
} __packed;
/**
* struct sev_data_receive_start - RECEIVE_START command parameters
*
......
......@@ -1674,6 +1674,8 @@ enum sev_cmd_id {
KVM_SEV_CERT_EXPORT,
/* Attestation report */
KVM_SEV_GET_ATTESTATION_REPORT,
/* Guest Migration Extension */
KVM_SEV_SEND_CANCEL,
KVM_SEV_NR_MAX,
};
......
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