tpm: Move backend code under the 'backends/' directory

TPM subsytem is split into backends (see commit f4ede81eed2)
and frontends (see i.e. 3676bc69b35). Keep the emulated
hardware 'frontends' under hw/tpm/, but move the backends
in the backends/tpm/ directory.

Suggested-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Message-id: 20200612085444.8362-13-philmd@redhat.com
Signed-off-by: Stefan Berger <stefanb@linux.vnet.ibm.com>

1 files changed, 0 insertions, 405 deletions

diff --git a/hw/tpm/tpm_passthrough.c b/hw/tpm/tpm_passthrough.c
deleted file mode 100644
index 7403807ec4..0000000000
--- a/hw/tpm/tpm_passthrough.c
+++ /dev/null
@@ -1,405 +0,0 @@
-/*
- *  passthrough TPM driver
- *
- *  Copyright (c) 2010 - 2013 IBM Corporation
- *  Authors:
- *    Stefan Berger <stefanb@us.ibm.com>
- *
- *  Copyright (C) 2011 IAIK, Graz University of Technology
- *    Author: Andreas Niederl
- *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2 of the License, or (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library; if not, see <http://www.gnu.org/licenses/>
- */
-
-#include "qemu/osdep.h"
-#include "qemu-common.h"
-#include "qemu/error-report.h"
-#include "qemu/module.h"
-#include "qemu/sockets.h"
-#include "sysemu/tpm_backend.h"
-#include "sysemu/tpm_util.h"
-#include "tpm_int.h"
-#include "qapi/clone-visitor.h"
-#include "qapi/qapi-visit-tpm.h"
-#include "trace.h"
-
-#define TYPE_TPM_PASSTHROUGH "tpm-passthrough"
-#define TPM_PASSTHROUGH(obj) \
-    OBJECT_CHECK(TPMPassthruState, (obj), TYPE_TPM_PASSTHROUGH)
-
-/* data structures */
-struct TPMPassthruState {
-    TPMBackend parent;
-
-    TPMPassthroughOptions *options;
-    const char *tpm_dev;
-    int tpm_fd;
-    bool tpm_executing;
-    bool tpm_op_canceled;
-    int cancel_fd;
-
-    TPMVersion tpm_version;
-    size_t tpm_buffersize;
-};
-
-typedef struct TPMPassthruState TPMPassthruState;
-
-#define TPM_PASSTHROUGH_DEFAULT_DEVICE "/dev/tpm0"
-
-/* functions */
-
-static void tpm_passthrough_cancel_cmd(TPMBackend *tb);
-
-static int tpm_passthrough_unix_read(int fd, uint8_t *buf, uint32_t len)
-{
-    int ret;
- reread:
-    ret = read(fd, buf, len);
-    if (ret < 0) {
-        if (errno != EINTR && errno != EAGAIN) {
-            return -1;
-        }
-        goto reread;
-    }
-    return ret;
-}
-
-static void tpm_passthrough_unix_tx_bufs(TPMPassthruState *tpm_pt,
-                                         const uint8_t *in, uint32_t in_len,
-                                         uint8_t *out, uint32_t out_len,
-                                         bool *selftest_done, Error **errp)
-{
-    ssize_t ret;
-    bool is_selftest;
-
-    /* FIXME: protect shared variables or use other sync mechanism */
-    tpm_pt->tpm_op_canceled = false;
-    tpm_pt->tpm_executing = true;
-    *selftest_done = false;
-
-    is_selftest = tpm_util_is_selftest(in, in_len);
-
-    ret = qemu_write_full(tpm_pt->tpm_fd, in, in_len);
-    if (ret != in_len) {
-        if (!tpm_pt->tpm_op_canceled || errno != ECANCELED) {
-            error_setg_errno(errp, errno, "tpm_passthrough: error while "
-                             "transmitting data to TPM");
-        }
-        goto err_exit;
-    }
-
-    tpm_pt->tpm_executing = false;
-
-    ret = tpm_passthrough_unix_read(tpm_pt->tpm_fd, out, out_len);
-    if (ret < 0) {
-        if (!tpm_pt->tpm_op_canceled || errno != ECANCELED) {
-            error_setg_errno(errp, errno, "tpm_passthrough: error while "
-                             "reading data from TPM");
-        }
-    } else if (ret < sizeof(struct tpm_resp_hdr) ||
-               tpm_cmd_get_size(out) != ret) {
-        ret = -1;
-        error_setg_errno(errp, errno, "tpm_passthrough: received invalid "
-                     "response packet from TPM");
-    }
-
-    if (is_selftest && (ret >= sizeof(struct tpm_resp_hdr))) {
-        *selftest_done = tpm_cmd_get_errcode(out) == 0;
-    }
-
-err_exit:
-    if (ret < 0) {
-        tpm_util_write_fatal_error_response(out, out_len);
-    }
-
-    tpm_pt->tpm_executing = false;
-}
-
-static void tpm_passthrough_handle_request(TPMBackend *tb, TPMBackendCmd *cmd,
-                                           Error **errp)
-{
-    TPMPassthruState *tpm_pt = TPM_PASSTHROUGH(tb);
-
-    trace_tpm_passthrough_handle_request(cmd);
-
-    tpm_passthrough_unix_tx_bufs(tpm_pt, cmd->in, cmd->in_len,
-                                 cmd->out, cmd->out_len, &cmd->selftest_done,
-                                 errp);
-}
-
-static void tpm_passthrough_reset(TPMBackend *tb)
-{
-    trace_tpm_passthrough_reset();
-
-    tpm_passthrough_cancel_cmd(tb);
-}
-
-static bool tpm_passthrough_get_tpm_established_flag(TPMBackend *tb)
-{
-    return false;
-}
-
-static int tpm_passthrough_reset_tpm_established_flag(TPMBackend *tb,
-                                                      uint8_t locty)
-{
-    /* only a TPM 2.0 will support this */
-    return 0;
-}
-
-static void tpm_passthrough_cancel_cmd(TPMBackend *tb)
-{
-    TPMPassthruState *tpm_pt = TPM_PASSTHROUGH(tb);
-    int n;
-
-    /*
-     * As of Linux 3.7 the tpm_tis driver does not properly cancel
-     * commands on all TPM manufacturers' TPMs.
-     * Only cancel if we're busy so we don't cancel someone else's
-     * command, e.g., a command executed on the host.
-     */
-    if (tpm_pt->tpm_executing) {
-        if (tpm_pt->cancel_fd >= 0) {
-            tpm_pt->tpm_op_canceled = true;
-            n = write(tpm_pt->cancel_fd, "-", 1);
-            if (n != 1) {
-                error_report("Canceling TPM command failed: %s",
-                             strerror(errno));
-            }
-        } else {
-            error_report("Cannot cancel TPM command due to missing "
-                         "TPM sysfs cancel entry");
-        }
-    }
-}
-
-static TPMVersion tpm_passthrough_get_tpm_version(TPMBackend *tb)
-{
-    TPMPassthruState *tpm_pt = TPM_PASSTHROUGH(tb);
-
-    return tpm_pt->tpm_version;
-}
-
-static size_t tpm_passthrough_get_buffer_size(TPMBackend *tb)
-{
-    TPMPassthruState *tpm_pt = TPM_PASSTHROUGH(tb);
-    int ret;
-
-    ret = tpm_util_get_buffer_size(tpm_pt->tpm_fd, tpm_pt->tpm_version,
-                                   &tpm_pt->tpm_buffersize);
-    if (ret < 0) {
-        tpm_pt->tpm_buffersize = 4096;
-    }
-    return tpm_pt->tpm_buffersize;
-}
-
-/*
- * Unless path or file descriptor set has been provided by user,
- * determine the sysfs cancel file following kernel documentation
- * in Documentation/ABI/stable/sysfs-class-tpm.
- * From /dev/tpm0 create /sys/class/tpm/tpm0/device/cancel
- * before 4.0: /sys/class/misc/tpm0/device/cancel
- */
-static int tpm_passthrough_open_sysfs_cancel(TPMPassthruState *tpm_pt)
-{
-    int fd = -1;
-    char *dev;
-    char path[PATH_MAX];
-
-    if (tpm_pt->options->cancel_path) {
-        fd = qemu_open(tpm_pt->options->cancel_path, O_WRONLY);
-        if (fd < 0) {
-            error_report("tpm_passthrough: Could not open TPM cancel path: %s",
-                         strerror(errno));
-        }
-        return fd;
-    }
-
-    dev = strrchr(tpm_pt->tpm_dev, '/');
-    if (!dev) {
-        error_report("tpm_passthrough: Bad TPM device path %s",
-                     tpm_pt->tpm_dev);
-        return -1;
-    }
-
-    dev++;
-    if (snprintf(path, sizeof(path), "/sys/class/tpm/%s/device/cancel",
-                 dev) < sizeof(path)) {
-        fd = qemu_open(path, O_WRONLY);
-        if (fd < 0) {
-            if (snprintf(path, sizeof(path), "/sys/class/misc/%s/device/cancel",
-                         dev) < sizeof(path)) {
-                fd = qemu_open(path, O_WRONLY);
-            }
-        }
-    }
-
-    if (fd < 0) {
-        error_report("tpm_passthrough: Could not guess TPM cancel path");
-    } else {
-        tpm_pt->options->cancel_path = g_strdup(path);
-    }
-
-    return fd;
-}
-
-static int
-tpm_passthrough_handle_device_opts(TPMPassthruState *tpm_pt, QemuOpts *opts)
-{
-    const char *value;
-
-    value = qemu_opt_get(opts, "cancel-path");
-    if (value) {
-        tpm_pt->options->cancel_path = g_strdup(value);
-        tpm_pt->options->has_cancel_path = true;
-    }
-
-    value = qemu_opt_get(opts, "path");
-    if (value) {
-        tpm_pt->options->has_path = true;
-        tpm_pt->options->path = g_strdup(value);
-    }
-
-    tpm_pt->tpm_dev = value ? value : TPM_PASSTHROUGH_DEFAULT_DEVICE;
-    tpm_pt->tpm_fd = qemu_open(tpm_pt->tpm_dev, O_RDWR);
-    if (tpm_pt->tpm_fd < 0) {
-        error_report("Cannot access TPM device using '%s': %s",
-                     tpm_pt->tpm_dev, strerror(errno));
-        return -1;
-    }
-
-    if (tpm_util_test_tpmdev(tpm_pt->tpm_fd, &tpm_pt->tpm_version)) {
-        error_report("'%s' is not a TPM device.",
-                     tpm_pt->tpm_dev);
-        return -1;
-    }
-
-    tpm_pt->cancel_fd = tpm_passthrough_open_sysfs_cancel(tpm_pt);
-    if (tpm_pt->cancel_fd < 0) {
-        return -1;
-    }
-
-    return 0;
-}
-
-static TPMBackend *tpm_passthrough_create(QemuOpts *opts)
-{
-    Object *obj = object_new(TYPE_TPM_PASSTHROUGH);
-
-    if (tpm_passthrough_handle_device_opts(TPM_PASSTHROUGH(obj), opts)) {
-        object_unref(obj);
-        return NULL;
-    }
-
-    return TPM_BACKEND(obj);
-}
-
-static int tpm_passthrough_startup_tpm(TPMBackend *tb, size_t buffersize)
-{
-    TPMPassthruState *tpm_pt = TPM_PASSTHROUGH(tb);
-
-    if (buffersize && buffersize < tpm_pt->tpm_buffersize) {
-        error_report("Requested buffer size of %zu is smaller than host TPM's "
-                     "fixed buffer size of %zu",
-                     buffersize, tpm_pt->tpm_buffersize);
-        return -1;
-    }
-
-    return 0;
-}
-
-static TpmTypeOptions *tpm_passthrough_get_tpm_options(TPMBackend *tb)
-{
-    TpmTypeOptions *options = g_new0(TpmTypeOptions, 1);
-
-    options->type = TPM_TYPE_OPTIONS_KIND_PASSTHROUGH;
-    options->u.passthrough.data = QAPI_CLONE(TPMPassthroughOptions,
-                                             TPM_PASSTHROUGH(tb)->options);
-
-    return options;
-}
-
-static const QemuOptDesc tpm_passthrough_cmdline_opts[] = {
-    TPM_STANDARD_CMDLINE_OPTS,
-    {
-        .name = "cancel-path",
-        .type = QEMU_OPT_STRING,
-        .help = "Sysfs file entry for canceling TPM commands",
-    },
-    {
-        .name = "path",
-        .type = QEMU_OPT_STRING,
-        .help = "Path to TPM device on the host",
-    },
-    { /* end of list */ },
-};
-
-static void tpm_passthrough_inst_init(Object *obj)
-{
-    TPMPassthruState *tpm_pt = TPM_PASSTHROUGH(obj);
-
-    tpm_pt->options = g_new0(TPMPassthroughOptions, 1);
-    tpm_pt->tpm_fd = -1;
-    tpm_pt->cancel_fd = -1;
-}
-
-static void tpm_passthrough_inst_finalize(Object *obj)
-{
-    TPMPassthruState *tpm_pt = TPM_PASSTHROUGH(obj);
-
-    tpm_passthrough_cancel_cmd(TPM_BACKEND(obj));
-
-    if (tpm_pt->tpm_fd >= 0) {
-        qemu_close(tpm_pt->tpm_fd);
-    }
-    if (tpm_pt->cancel_fd >= 0) {
-        qemu_close(tpm_pt->cancel_fd);
-    }
-    qapi_free_TPMPassthroughOptions(tpm_pt->options);
-}
-
-static void tpm_passthrough_class_init(ObjectClass *klass, void *data)
-{
-    TPMBackendClass *tbc = TPM_BACKEND_CLASS(klass);
-
-    tbc->type = TPM_TYPE_PASSTHROUGH;
-    tbc->opts = tpm_passthrough_cmdline_opts;
-    tbc->desc = "Passthrough TPM backend driver";
-    tbc->create = tpm_passthrough_create;
-    tbc->startup_tpm = tpm_passthrough_startup_tpm;
-    tbc->reset = tpm_passthrough_reset;
-    tbc->cancel_cmd = tpm_passthrough_cancel_cmd;
-    tbc->get_tpm_established_flag = tpm_passthrough_get_tpm_established_flag;
-    tbc->reset_tpm_established_flag =
-        tpm_passthrough_reset_tpm_established_flag;
-    tbc->get_tpm_version = tpm_passthrough_get_tpm_version;
-    tbc->get_buffer_size = tpm_passthrough_get_buffer_size;
-    tbc->get_tpm_options = tpm_passthrough_get_tpm_options;
-    tbc->handle_request = tpm_passthrough_handle_request;
-}
-
-static const TypeInfo tpm_passthrough_info = {
-    .name = TYPE_TPM_PASSTHROUGH,
-    .parent = TYPE_TPM_BACKEND,
-    .instance_size = sizeof(TPMPassthruState),
-    .class_init = tpm_passthrough_class_init,
-    .instance_init = tpm_passthrough_inst_init,
-    .instance_finalize = tpm_passthrough_inst_finalize,
-};
-
-static void tpm_passthrough_register(void)
-{
-    type_register_static(&tpm_passthrough_info);
-}
-
-type_init(tpm_passthrough_register)