new file mode 100644
@@ -0,0 +1,117 @@
+/*
+ * vtpmctrl.c -- Linux vTPM driver control program
+ *
+ * (c) Copyright IBM Corporation 2015.
+ *
+ * Author: Stefan Berger <stefanb@us.ibm.com>
+ *
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ * Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ *
+ * Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * Neither the names of the IBM Corporation nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+
+#include <linux/vtpm.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <sys/ioctl.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <errno.h>
+#include <string.h>
+
+int vtpmctrl_create(void)
+{
+ int fd, n, option, li, serverfd, nn;
+ struct vtpm_new_pair vtpm_new_pair = {
+ .flags = 0,
+ };
+ char tpmdev[16];
+ unsigned char buffer[4096];
+ const unsigned char response[] = {
+ 0x00, 0xc4, 0x00, 0x00, 0x00, 0x0a, 0x00, 0x00, 0x00, 0x00
+ };
+
+ fd = open("/dev/vtpmx", O_RDWR);
+ if (fd < 0) {
+ perror("Could not open /dev/vtpmx");
+ return 1;
+ }
+
+ n = ioctl(fd, VTPM_NEW_DEV, &vtpm_new_pair);
+ if (n != 0) {
+ perror("ioctl to create dev pair failed");
+ close(fd);
+ return 1;
+ }
+
+ snprintf(tpmdev, sizeof(tpmdev), "/dev/tpm%u",
+ vtpm_new_pair.tpm_dev_num);
+
+ serverfd = vtpm_new_pair.fd;
+
+ printf("Created TPM device %s; vTPM device has fd %d, "
+ "major/minor = %u/%u.\n",
+ tpmdev, serverfd, vtpm_new_pair.major, vtpm_new_pair.minor);
+
+ close(fd);
+
+ while (1) {
+ n = read(serverfd, buffer, sizeof(buffer));
+ if (n > 0) {
+ printf("Request with %d bytes:\n", n);
+ nn = 0;
+ while (nn < n) {
+ printf("0x%02x ", buffer[nn]);
+ nn++;
+ if (nn % 16 == 0)
+ printf("\n");
+ }
+ printf("\n");
+ n = write(serverfd, response, sizeof(response));
+ if (n < 0) {
+ printf("Error from writing the response: %s\n",
+ strerror(errno));
+ break;
+ } else {
+ printf("Sent response with %d bytes.\n", n);
+ }
+ } else {
+ break;
+ }
+ }
+
+ return 0;
+}
+
+int main(int argc, char *argv[])
+{
+ return vtpmctrl_create();
+}
This patch provides a program that is for testing purposes only. Build it using the following commands: make headers_install ARCH=x86_64 INSTALL_HDR_PATH=/usr gcc vtpmctrl.c -o vtpmctrl To use it: To create a device pair and have vtpmctrl listen for commands, display them and respond with TPM success messages do: #> ./vtpmctrl Created TPM device /dev/tpm0; vTPM device has fd 4, major/minor = 10/224. In another shell do #> exec 100<>/dev/tpm0 #> /bin/echo -en '\x00\xc1\x00\x00\x00\x0a\x00\x00\x00\x00' >&100 #> od -t x1 <&100 00000000 00 c4 00 00 00 0a 00 00 00 00 00000012 #> exec 100>&- Signed-off-by: Stefan Berger <stefanb@linux.vnet.ibm.com> --- vtpmctrl.c | 117 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 117 insertions(+) create mode 100644 vtpmctrl.c