Merge remote-tracking branch 'remotes/stefanberger/tags/pull-tpm-2017-12-15-1' into staging

Merge tpm 2017/12/15 v1

# gpg: Signature made Fri 15 Dec 2017 04:44:15 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-2017-12-15-1: (32 commits)
  tpm: tpm_passthrough: Fail startup if FE buffer size < BE buffer size
  tpm: tpm_emulator: get and set buffer size of device
  tpm: tpm_passthrough: Read the buffer size from the host device
  tpm: pull tpm_util_request() out of tpm_util_test()
  tpm: Move getting TPM buffer size to backends
  tpm: remove tpm_register_model()
  tpm-tis: use DEFINE_PROP_TPMBE
  qdev: add DEFINE_PROP_TPMBE
  tpm-tis: check that at most one TPM device exists
  tpm-tis: remove redundant 'tpm_tis:' in error messages
  tpm-emulator: add a FIXME comment about blocking cancel
  acpi: change TPM TIS data conditions
  tpm: add tpm_cmd_get_size() to tpm_util
  tpm: add TPM interface to lookup TPM version
  tpm: lookup the the TPM interface instead of TIS device
  tpm: rename qemu_find_tpm() -> qemu_find_tpm_be()
  tpm-tis: simplify header inclusion
  tpm-passthrough: workaround a possible race
  tpm-passthrough: simplify create()
  tpm-passthrough: make it safer to destroy after creation
  ...

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

1 files changed, 84 insertions, 14 deletions

diff --git a/hw/tpm/tpm_emulator.c b/hw/tpm/tpm_emulator.c
index e1a68104d6..3ae8bf6c5a 100644
--- a/hw/tpm/tpm_emulator.c
+++ b/hw/tpm/tpm_emulator.c
@@ -186,7 +186,6 @@ static int tpm_emulator_set_locality(TPMEmulator *tpm_emu, uint8_t locty_number,
 static void tpm_emulator_handle_request(TPMBackend *tb, TPMBackendCmd *cmd)
 {
     TPMEmulator *tpm_emu = TPM_EMULATOR(tb);
-    TPMIfClass *tic = TPM_IF_GET_CLASS(tb->tpm_state);
     Error *err = NULL;
 
     DPRINTF("processing TPM command");
@@ -201,7 +200,6 @@ static void tpm_emulator_handle_request(TPMBackend *tb, TPMBackendCmd *cmd)
         goto error;
     }
 
-    tic->request_completed(TPM_IF(tb->tpm_state));
     return;
 
 error:
@@ -234,13 +232,14 @@ static int tpm_emulator_check_caps(TPMEmulator *tpm_emu)
     switch (tpm_emu->tpm_version) {
     case TPM_VERSION_1_2:
         caps = PTM_CAP_INIT | PTM_CAP_SHUTDOWN | PTM_CAP_GET_TPMESTABLISHED |
-               PTM_CAP_SET_LOCALITY | PTM_CAP_SET_DATAFD;
+               PTM_CAP_SET_LOCALITY | PTM_CAP_SET_DATAFD | PTM_CAP_STOP |
+               PTM_CAP_SET_BUFFERSIZE;
         tpm = "1.2";
         break;
     case TPM_VERSION_2_0:
         caps = PTM_CAP_INIT | PTM_CAP_SHUTDOWN | PTM_CAP_GET_TPMESTABLISHED |
                PTM_CAP_SET_LOCALITY | PTM_CAP_RESET_TPMESTABLISHED |
-               PTM_CAP_SET_DATAFD;
+               PTM_CAP_SET_DATAFD | PTM_CAP_STOP | PTM_CAP_SET_BUFFERSIZE;
         tpm = "2";
         break;
     case TPM_VERSION_UNSPEC:
@@ -257,12 +256,76 @@ static int tpm_emulator_check_caps(TPMEmulator *tpm_emu)
     return 0;
 }
 
-static int tpm_emulator_startup_tpm(TPMBackend *tb)
+static int tpm_emulator_stop_tpm(TPMBackend *tb)
+{
+    TPMEmulator *tpm_emu = TPM_EMULATOR(tb);
+    ptm_res res;
+
+    if (tpm_emulator_ctrlcmd(tpm_emu, CMD_STOP, &res, 0, sizeof(res)) < 0) {
+        error_report("tpm-emulator: Could not stop TPM: %s",
+                     strerror(errno));
+        return -1;
+    }
+
+    res = be32_to_cpu(res);
+    if (res) {
+        error_report("tpm-emulator: TPM result for CMD_STOP: 0x%x", res);
+        return -1;
+    }
+
+    return 0;
+}
+
+static int tpm_emulator_set_buffer_size(TPMBackend *tb,
+                                        size_t wanted_size,
+                                        size_t *actual_size)
+{
+    TPMEmulator *tpm_emu = TPM_EMULATOR(tb);
+    ptm_setbuffersize psbs;
+
+    if (tpm_emulator_stop_tpm(tb) < 0) {
+        return -1;
+    }
+
+    psbs.u.req.buffersize = cpu_to_be32(wanted_size);
+
+    if (tpm_emulator_ctrlcmd(tpm_emu, CMD_SET_BUFFERSIZE, &psbs,
+                             sizeof(psbs.u.req), sizeof(psbs.u.resp)) < 0) {
+        error_report("tpm-emulator: Could not set buffer size: %s",
+                     strerror(errno));
+        return -1;
+    }
+
+    psbs.u.resp.tpm_result = be32_to_cpu(psbs.u.resp.tpm_result);
+    if (psbs.u.resp.tpm_result != 0) {
+        error_report("tpm-emulator: TPM result for set buffer size : 0x%x",
+                     psbs.u.resp.tpm_result);
+        return -1;
+    }
+
+    if (actual_size) {
+        *actual_size = be32_to_cpu(psbs.u.resp.buffersize);
+    }
+
+    DPRINTF("buffer size: %u, min: %u, max: %u\n",
+            be32_to_cpu(psbs.u.resp.buffersize),
+            be32_to_cpu(psbs.u.resp.minsize),
+            be32_to_cpu(psbs.u.resp.maxsize));
+
+    return 0;
+}
+
+static int tpm_emulator_startup_tpm(TPMBackend *tb, size_t buffersize)
 {
     TPMEmulator *tpm_emu = TPM_EMULATOR(tb);
     ptm_init init;
     ptm_res res;
 
+    if (buffersize != 0 &&
+        tpm_emulator_set_buffer_size(tb, buffersize, NULL) < 0) {
+        goto err_exit;
+    }
+
     DPRINTF("%s", __func__);
     if (tpm_emulator_ctrlcmd(tpm_emu, CMD_INIT, &init, sizeof(init),
                              sizeof(init)) < 0) {
@@ -340,6 +403,7 @@ static void tpm_emulator_cancel_cmd(TPMBackend *tb)
         return;
     }
 
+    /* FIXME: make the function non-blocking, or it may block a VCPU */
     if (tpm_emulator_ctrlcmd(tpm_emu, CMD_CANCEL_TPM_CMD, &res, 0,
                              sizeof(res)) < 0) {
         error_report("tpm-emulator: Could not cancel command: %s",
@@ -357,6 +421,17 @@ static TPMVersion tpm_emulator_get_tpm_version(TPMBackend *tb)
     return tpm_emu->tpm_version;
 }
 
+static size_t tpm_emulator_get_buffer_size(TPMBackend *tb)
+{
+    size_t actual_size;
+
+    if (tpm_emulator_set_buffer_size(tb, 0, &actual_size) < 0) {
+        return 4096;
+    }
+
+    return actual_size;
+}
+
 static int tpm_emulator_block_migration(TPMEmulator *tpm_emu)
 {
     Error *err = NULL;
@@ -465,22 +540,16 @@ err:
     return -1;
 }
 
-static TPMBackend *tpm_emulator_create(QemuOpts *opts, const char *id)
+static TPMBackend *tpm_emulator_create(QemuOpts *opts)
 {
     TPMBackend *tb = TPM_BACKEND(object_new(TYPE_TPM_EMULATOR));
 
-    tb->id = g_strdup(id);
-
     if (tpm_emulator_handle_device_opts(TPM_EMULATOR(tb), opts)) {
-        goto err_exit;
+        object_unref(OBJECT(tb));
+        return NULL;
     }
 
     return tb;
-
-err_exit:
-    object_unref(OBJECT(tb));
-
-    return NULL;
 }
 
 static TpmTypeOptions *tpm_emulator_get_tpm_options(TPMBackend *tb)
@@ -563,6 +632,7 @@ static void tpm_emulator_class_init(ObjectClass *klass, void *data)
     tbc->get_tpm_established_flag = tpm_emulator_get_tpm_established_flag;
     tbc->reset_tpm_established_flag = tpm_emulator_reset_tpm_established_flag;
     tbc->get_tpm_version = tpm_emulator_get_tpm_version;
+    tbc->get_buffer_size = tpm_emulator_get_buffer_size;
     tbc->get_tpm_options = tpm_emulator_get_tpm_options;
 
     tbc->handle_request = tpm_emulator_handle_request;