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Merge tpm 2017/11/15 v1 

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Merge remote-tracking branch 'remotes/stefanberger/tags/pull-tpm-2017-11-15-1' into staging

Merge tpm 2017/11/15 v1

# gpg: Signature made Wed 15 Nov 2017 11:51:47 GMT
# gpg:                using RSA key 0x75AD65802A0B4211
# gpg: Good signature from "Stefan Berger <stefanb@linux.vnet.ibm.com>"
# gpg: WARNING: This key is not certified with a trusted signature!
# gpg:          There is no indication that the signature belongs to the owner.
# Primary key fingerprint: B818 B9CA DF90 89C2 D5CE  C66B 75AD 6580 2A0B 4211

* remotes/stefanberger/tags/pull-tpm-2017-11-15-1:
  tpm_tis: Return 0 for every register in case of failure mode
  tpm_tis: Return TPM_VERSION_UNSPEC in case of BE failure
  tpm-emulator: protect concurrent ctrl_chr access
  specs: Extend TPM spec with TPM emulator description

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Peter Maydell 2017-11-16 11:34:24 +00:00
parent 1fa0f627d0 6cd65969da
commit 8048082f7a
3 changed files with 112 additions and 17 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

79
docs/specs/tpm.txt
View File

@ -121,3 +121,82 @@ crw-------. 1 root root 10, 224 Jul 11 10:11 /dev/tpm0
PCR-00: 35 4E 3B CE 23 9F 38 59 ...
...
PCR-23: 00 00 00 00 00 00 00 00 ...
== The QEMU TPM emulator device ==
The TPM emulator device uses an external TPM emulator called 'swtpm' for
sending TPM commands to and receiving responses from. The swtpm program
must have been started before trying to access it through the TPM emulator
with QEMU.
The TPM emulator implements a command channel for transferring TPM commands
and responses as well as a control channel over which control commands can
be sent. The specification for the control channel can be found here:
https://github.com/stefanberger/swtpm/blob/master/man/man3/swtpm_ioctls.pod
The control channel serves the purpose of resetting, initializing, and
migrating the TPM state, among other things.
The swtpm program behaves like a hardware TPM and therefore needs to be
initialized by the firmware running inside the QEMU virtual machine.
One necessary step for initializing the device is to send the TPM_Startup
command to it. SeaBIOS, for example, has been instrumented to initialize
a TPM 1.2 or TPM 2 device using this command.
QEMU files related to the TPM emulator device:
- hw/tpm/tpm_emulator.c
- hw/tpm/tpm_util.c
- hw/tpm/tpm_util.h
The following commands start the swtpm with a UnixIO control channel over
a socket interface. They do not need to be run as root.
mkdir /tmp/mytpm1
swtpm socket --tpmstate dir=/tmp/mytpm1 \
--ctrl type=unixio,path=/tmp/mytpm1/swtpm-sock \
--log level=20
Command line to start QEMU with the TPM emulator device communicating with
the swtpm:
qemu-system-x86_64 -display sdl -enable-kvm \
-m 1024 -boot d -bios bios-256k.bin -boot menu=on \
-chardev socket,id=chrtpm,path=/tmp/mytpm1/swtpm-sock \
-tpmdev emulator,id=tpm0,chardev=chrtpm \
-device tpm-tis,tpmdev=tpm0 test.img
In case SeaBIOS is used as firmware, it should show the TPM menu item
after entering the menu with 'ESC'.
Select boot device:
1. DVD/CD [ata1-0: QEMU DVD-ROM ATAPI-4 DVD/CD]
[...]
5. Legacy option rom
t. TPM Configuration
The following commands should result in similar output inside the VM with a
Linux kernel that either has the TPM TIS driver built-in or available as a
module:
#> dmesg | grep -i tpm
[ 0.711310] tpm_tis 00:06: 1.2 TPM (device=id 0x1, rev-id 1)
#> dmesg | grep TCPA
[ 0.000000] ACPI: TCPA 0x0000000003FFD191C 000032 (v02 BOCHS \
BXPCTCPA 0000001 BXPC 00000001)
#> ls -l /dev/tpm*
crw-------. 1 root root 10, 224 Jul 11 10:11 /dev/tpm0
#> find /sys/devices/ | grep pcrs$ | xargs cat
PCR-00: 35 4E 3B CE 23 9F 38 59 ...
...
PCR-23: 00 00 00 00 00 00 00 00 ...

44
hw/tpm/tpm_emulator.c
View File

@ -71,15 +71,21 @@ typedef struct TPMEmulator {
ptm_cap caps; /* capabilities of the TPM */
uint8_t cur_locty_number; /* last set locality */
Error *migration_blocker;
QemuMutex mutex;
} TPMEmulator;
static int tpm_emulator_ctrlcmd(CharBackend *dev, unsigned long cmd, void *msg,
static int tpm_emulator_ctrlcmd(TPMEmulator *tpm, unsigned long cmd, void *msg,
size_t msg_len_in, size_t msg_len_out)
{
CharBackend *dev = &tpm->ctrl_chr;
uint32_t cmd_no = cpu_to_be32(cmd);
ssize_t n = sizeof(uint32_t) + msg_len_in;
uint8_t *buf = NULL;
int ret = -1;
qemu_mutex_lock(&tpm->mutex);
buf = g_alloca(n);
memcpy(buf, &cmd_no, sizeof(cmd_no));
@ -87,17 +93,21 @@ static int tpm_emulator_ctrlcmd(CharBackend *dev, unsigned long cmd, void *msg,
n = qemu_chr_fe_write_all(dev, buf, n);
if (n <= 0) {
return -1;
goto end;
}
if (msg_len_out != 0) {
n = qemu_chr_fe_read_all(dev, msg, msg_len_out);
if (n <= 0) {
return -1;
goto end;
}
}
return 0;
ret = 0;
end:
qemu_mutex_unlock(&tpm->mutex);
return ret;
}
static int tpm_emulator_unix_tx_bufs(TPMEmulator *tpm_emu,
@ -154,7 +164,7 @@ static int tpm_emulator_set_locality(TPMEmulator *tpm_emu, uint8_t locty_number,
DPRINTF("setting locality : 0x%x", locty_number);
loc.u.req.loc = locty_number;
if (tpm_emulator_ctrlcmd(&tpm_emu->ctrl_chr, CMD_SET_LOCALITY, &loc,
if (tpm_emulator_ctrlcmd(tpm_emu, CMD_SET_LOCALITY, &loc,
sizeof(loc), sizeof(loc)) < 0) {
error_setg(errp, "tpm-emulator: could not set locality : %s",
strerror(errno));
@ -202,8 +212,8 @@ error:
static int tpm_emulator_probe_caps(TPMEmulator *tpm_emu)
{
DPRINTF("%s", __func__);
if (tpm_emulator_ctrlcmd(&tpm_emu->ctrl_chr, CMD_GET_CAPABILITY,
&tpm_emu->caps, 0, sizeof(tpm_emu->caps)) < 0) {
if (tpm_emulator_ctrlcmd(tpm_emu, CMD_GET_CAPABILITY,
&tpm_emu->caps, 0, sizeof(tpm_emu->caps)) < 0) {
error_report("tpm-emulator: probing failed : %s", strerror(errno));
return -1;
}
@ -254,8 +264,8 @@ static int tpm_emulator_startup_tpm(TPMBackend *tb)
ptm_res res;
DPRINTF("%s", __func__);
if (tpm_emulator_ctrlcmd(&tpm_emu->ctrl_chr, CMD_INIT, &init, sizeof(init),
sizeof(init)) < 0) {
if (tpm_emulator_ctrlcmd(tpm_emu, CMD_INIT, &init, sizeof(init),
sizeof(init)) < 0) {
error_report("tpm-emulator: could not send INIT: %s",
strerror(errno));
goto err_exit;
@ -278,7 +288,7 @@ static bool tpm_emulator_get_tpm_established_flag(TPMBackend *tb)
ptm_est est;
DPRINTF("%s", __func__);
if (tpm_emulator_ctrlcmd(&tpm_emu->ctrl_chr, CMD_GET_TPMESTABLISHED, &est,
if (tpm_emulator_ctrlcmd(tpm_emu, CMD_GET_TPMESTABLISHED, &est,
0, sizeof(est)) < 0) {
error_report("tpm-emulator: Could not get the TPM established flag: %s",
strerror(errno));
@ -302,7 +312,7 @@ static int tpm_emulator_reset_tpm_established_flag(TPMBackend *tb,
}
reset_est.u.req.loc = tpm_emu->cur_locty_number;
if (tpm_emulator_ctrlcmd(&tpm_emu->ctrl_chr, CMD_RESET_TPMESTABLISHED,
if (tpm_emulator_ctrlcmd(tpm_emu, CMD_RESET_TPMESTABLISHED,
&reset_est, sizeof(reset_est),
sizeof(reset_est)) < 0) {
error_report("tpm-emulator: Could not reset the establishment bit: %s",
@ -330,7 +340,7 @@ static void tpm_emulator_cancel_cmd(TPMBackend *tb)
return;
}
if (tpm_emulator_ctrlcmd(&tpm_emu->ctrl_chr, CMD_CANCEL_TPM_CMD, &res, 0,
if (tpm_emulator_ctrlcmd(tpm_emu, CMD_CANCEL_TPM_CMD, &res, 0,
sizeof(res)) < 0) {
error_report("tpm-emulator: Could not cancel command: %s",
strerror(errno));
@ -378,8 +388,8 @@ static int tpm_emulator_prepare_data_fd(TPMEmulator *tpm_emu)
qemu_chr_fe_set_msgfds(&tpm_emu->ctrl_chr, fds + 1, 1);
if (tpm_emulator_ctrlcmd(&tpm_emu->ctrl_chr, CMD_SET_DATAFD, &res, 0,
sizeof(res)) || res != 0) {
if (tpm_emulator_ctrlcmd(tpm_emu, CMD_SET_DATAFD, &res, 0,
sizeof(res)) < 0 || res != 0) {
error_report("tpm-emulator: Failed to send CMD_SET_DATAFD: %s",
strerror(errno));
goto err_exit;
@ -501,6 +511,7 @@ static void tpm_emulator_inst_init(Object *obj)
DPRINTF("%s", __func__);
tpm_emu->options = g_new0(TPMEmulatorOptions, 1);
tpm_emu->cur_locty_number = ~0;
qemu_mutex_init(&tpm_emu->mutex);
}
/*
@ -510,8 +521,7 @@ static void tpm_emulator_shutdown(TPMEmulator *tpm_emu)
{
ptm_res res;
if (tpm_emulator_ctrlcmd(&tpm_emu->ctrl_chr, CMD_SHUTDOWN, &res, 0,
sizeof(res)) < 0) {
if (tpm_emulator_ctrlcmd(tpm_emu, CMD_SHUTDOWN, &res, 0, sizeof(res)) < 0) {
error_report("tpm-emulator: Could not cleanly shutdown the TPM: %s",
strerror(errno));
} else if (res != 0) {
@ -536,6 +546,8 @@ static void tpm_emulator_inst_finalize(Object *obj)
migrate_del_blocker(tpm_emu->migration_blocker);
error_free(tpm_emu->migration_blocker);
}
qemu_mutex_destroy(&tpm_emu->mutex);
}
static void tpm_emulator_class_init(ObjectClass *klass, void *data)

6
hw/tpm/tpm_tis.c
View File

@ -545,7 +545,7 @@ static uint64_t tpm_tis_mmio_read(void *opaque, hwaddr addr,
uint8_t v;
if (tpm_backend_had_startup_error(s->be_driver)) {
return val;
return 0;
}
switch (offset) {
@ -1008,6 +1008,10 @@ TPMVersion tpm_tis_get_tpm_version(Object *obj)
{
TPMState *s = TPM(obj);
if (tpm_backend_had_startup_error(s->be_driver)) {
return TPM_VERSION_UNSPEC;
}
return tpm_backend_get_tpm_version(s->be_driver);
}