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authorStefan Berger <stefanb@linux.vnet.ibm.com>2016-04-18 20:26:15 +0300
committerJarkko Sakkinen <jarkko.sakkinen@linux.intel.com>2016-06-25 17:26:35 +0300
commit6f99612e250041a2402d3b1694bccb149cd424a4 (patch)
treec24d63342358211e4ea6000683d35c0709a83bca /include/uapi/linux/vtpm_proxy.h
parent2f9f53776dcd8ca3cc3d357d516ed76c3f038637 (diff)
downloadlinux-6f99612e250041a2402d3b1694bccb149cd424a4.tar.xz
tpm: Proxy driver for supporting multiple emulated TPMs
This patch implements a proxy driver for supporting multiple emulated TPMs in a system. The driver implements a device /dev/vtpmx that is used to created a client device pair /dev/tpmX (e.g., /dev/tpm10) and a server side that is accessed using a file descriptor returned by an ioctl. The device /dev/tpmX is the usual TPM device created by the core TPM driver. Applications or kernel subsystems can send TPM commands to it and the corresponding server-side file descriptor receives these commands and delivers them to an emulated TPM. The driver retrievs the TPM 1.2 durations and timeouts. Since this requires the startup of the TPM, we send a startup for TPM 1.2 as well as TPM 2. Signed-off-by: Stefan Berger <stefanb@linux.vnet.ibm.com> Reviewed-by: Jason Gunthorpe <jgunthorpe@obsidianresearch.com> CC: linux-kernel@vger.kernel.org CC: linux-doc@vger.kernel.org CC: linux-api@vger.kernel.org Reviewed-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com> Tested-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com> Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Diffstat (limited to 'include/uapi/linux/vtpm_proxy.h')
-rw-r--r--include/uapi/linux/vtpm_proxy.h36
1 files changed, 36 insertions, 0 deletions
diff --git a/include/uapi/linux/vtpm_proxy.h b/include/uapi/linux/vtpm_proxy.h
new file mode 100644
index 000000000000..41e8e2252a30
--- /dev/null
+++ b/include/uapi/linux/vtpm_proxy.h
@@ -0,0 +1,36 @@
+/*
+ * Definitions for the VTPM proxy driver
+ * Copyright (c) 2015, 2016, IBM Corporation
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ */
+
+#ifndef _UAPI_LINUX_VTPM_PROXY_H
+#define _UAPI_LINUX_VTPM_PROXY_H
+
+#include <linux/types.h>
+#include <linux/ioctl.h>
+
+/* ioctls */
+
+struct vtpm_proxy_new_dev {
+ __u32 flags; /* input */
+ __u32 tpm_num; /* output */
+ __u32 fd; /* output */
+ __u32 major; /* output */
+ __u32 minor; /* output */
+};
+
+/* above flags */
+#define VTPM_PROXY_FLAG_TPM2 1 /* emulator is TPM 2 */
+
+#define VTPM_PROXY_IOC_NEW_DEV _IOWR(0xa1, 0x00, struct vtpm_proxy_new_dev)
+
+#endif /* _UAPI_LINUX_VTPM_PROXY_H */