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https://github.com/freebsd/freebsd-src
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bhyve: add emulation for CRB register of TPM devices
Trap accesses to the CRB MMIO range and emulate them properly. Reviewed by: markj MFC after: 1 week Sponsored by: Beckhoff Automation GmbH & Co. KG Differential Revision: https://reviews.freebsd.org/D40459
This commit is contained in:
parent
e758ed2dd5
commit
28dc1aa733
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@ -141,7 +141,8 @@ tpm_device_create(struct tpm_device **const new_dev, struct vmctx *const vm_ctx,
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}
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if (dev->intf->init) {
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error = dev->intf->init(&dev->intf_sc, dev->emul, dev->emul_sc);
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error = dev->intf->init(&dev->intf_sc, dev->emul, dev->emul_sc,
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dev->acpi_dev);
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if (error)
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goto err_out;
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}
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@ -9,6 +9,7 @@
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#include <vmmapi.h>
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#include "acpi_device.h"
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#include "config.h"
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#include "tpm_device.h"
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#include "tpm_emul.h"
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@ -31,7 +32,8 @@
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struct tpm_intf {
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const char *name;
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int (*init)(void **sc, struct tpm_emul *emul, void *emul_sc);
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int (*init)(void **sc, struct tpm_emul *emul, void *emul_sc,
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struct acpi_device *acpi_dev);
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void (*deinit)(void *sc);
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int (*build_acpi_table)(void *sc, struct vmctx *vm_ctx);
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};
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@ -253,7 +253,173 @@ tpm_crb_thread(void *const arg)
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}
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static int
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tpm_crb_init(void **sc, struct tpm_emul *emul, void *emul_sc)
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tpm_crb_mmiocpy(void *const dst, void *const src, const int size)
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{
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if (!(size == 1 || size == 2 || size == 4 || size == 8))
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return (EINVAL);
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memcpy(dst, src, size);
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return (0);
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}
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static int
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tpm_crb_mem_handler(struct vcpu *vcpu __unused, const int dir,
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const uint64_t addr, const int size, uint64_t *const val, void *const arg1,
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const long arg2 __unused)
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{
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struct tpm_crb *crb;
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uint8_t *ptr;
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uint64_t off, shift;
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int error = 0;
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if ((addr & (size - 1)) != 0) {
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warnx("%s: unaligned %s access @ %16lx [size = %x]", __func__,
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(dir == MEM_F_READ) ? "read" : "write", addr, size);
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return (EINVAL);
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}
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crb = arg1;
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off = addr - TPM_CRB_ADDRESS;
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if (off > TPM_CRB_REGS_SIZE || off + size >= TPM_CRB_REGS_SIZE) {
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return (EINVAL);
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}
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shift = 8 * (off & 3);
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ptr = (uint8_t *)&crb->regs + off;
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if (dir == MEM_F_READ) {
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error = tpm_crb_mmiocpy(val, ptr, size);
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if (error)
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goto err_out;
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} else {
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switch (off & ~0x3) {
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case offsetof(struct tpm_crb_regs, loc_ctrl): {
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union tpm_crb_reg_loc_ctrl loc_ctrl;
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if ((size_t)size > sizeof(loc_ctrl))
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goto err_out;
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*val = *val << shift;
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tpm_crb_mmiocpy(&loc_ctrl, val, size);
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if (loc_ctrl.relinquish) {
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crb->regs.loc_sts.granted = false;
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crb->regs.loc_state.loc_assigned = false;
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} else if (loc_ctrl.request_access) {
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crb->regs.loc_sts.granted = true;
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crb->regs.loc_state.loc_assigned = true;
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}
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break;
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}
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case offsetof(struct tpm_crb_regs, ctrl_req): {
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union tpm_crb_reg_ctrl_req req;
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if ((size_t)size > sizeof(req))
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goto err_out;
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*val = *val << shift;
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tpm_crb_mmiocpy(&req, val, size);
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if (req.cmd_ready && !req.go_idle) {
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crb->regs.ctrl_sts.tpm_idle = false;
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} else if (!req.cmd_ready && req.go_idle) {
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crb->regs.ctrl_sts.tpm_idle = true;
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}
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break;
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}
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case offsetof(struct tpm_crb_regs, ctrl_cancel): {
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/* TODO: cancel the tpm command */
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warnx(
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"%s: cancelling a TPM command is not implemented yet",
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__func__);
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break;
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}
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case offsetof(struct tpm_crb_regs, ctrl_start): {
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union tpm_crb_reg_ctrl_start start;
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if ((size_t)size > sizeof(start))
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goto err_out;
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*val = *val << shift;
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pthread_mutex_lock(&crb->mutex);
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tpm_crb_mmiocpy(&start, val, size);
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if (!start.start || crb->regs.ctrl_start.start)
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break;
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crb->regs.ctrl_start.start = true;
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pthread_cond_signal(&crb->cond);
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pthread_mutex_unlock(&crb->mutex);
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break;
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}
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case offsetof(struct tpm_crb_regs, cmd_size):
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case offsetof(struct tpm_crb_regs, cmd_addr_lo):
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case offsetof(struct tpm_crb_regs, cmd_addr_hi):
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case offsetof(struct tpm_crb_regs, rsp_size):
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case offsetof(struct tpm_crb_regs,
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rsp_addr) ... offsetof(struct tpm_crb_regs, rsp_addr) +
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4:
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case offsetof(struct tpm_crb_regs,
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data_buffer) ... offsetof(struct tpm_crb_regs, data_buffer) +
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TPM_CRB_DATA_BUFFER_SIZE / 4:
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/*
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* Those fields are used to execute a TPM command. The
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* crb_thread will access them. For that reason, we have
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* to acquire the crb mutex in order to write them.
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*/
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pthread_mutex_lock(&crb->mutex);
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error = tpm_crb_mmiocpy(ptr, val, size);
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pthread_mutex_unlock(&crb->mutex);
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if (error)
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goto err_out;
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break;
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default:
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/*
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* The other fields are either readonly or we do not
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* support writing them.
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*/
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error = EINVAL;
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goto err_out;
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}
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}
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return (0);
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err_out:
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warnx("%s: invalid %s @ %16lx [size = %d]", __func__,
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dir == MEM_F_READ ? "read" : "write", addr, size);
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return (error);
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}
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static int
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tpm_crb_modify_mmio_registration(const bool registration, void *const arg1)
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{
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struct mem_range crb_mmio = {
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.name = "crb-mmio",
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.base = TPM_CRB_ADDRESS,
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.size = TPM_CRB_LOCALITIES_MAX * TPM_CRB_CONTROL_AREA_SIZE,
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.flags = MEM_F_RW,
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.arg1 = arg1,
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.handler = tpm_crb_mem_handler,
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};
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if (registration)
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return (register_mem(&crb_mmio));
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else
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return (unregister_mem(&crb_mmio));
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}
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static int
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tpm_crb_init(void **sc, struct tpm_emul *emul, void *emul_sc,
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struct acpi_device *acpi_dev)
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{
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struct tpm_crb *crb = NULL;
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int error;
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goto err_out;
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}
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error = acpi_device_add_res_fixed_memory32(acpi_dev, false,
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TPM_CRB_ADDRESS, TPM_CRB_CONTROL_AREA_SIZE);
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if (error) {
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warnx("%s: failed to add acpi resources\n", __func__);
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goto err_out;
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}
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error = tpm_crb_modify_mmio_registration(true, crb);
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if (error) {
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warnx("%s: failed to register crb mmio", __func__);
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goto err_out;
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}
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error = pthread_mutex_init(&crb->mutex, NULL);
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if (error) {
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warnc(error, "%s: failed to init mutex", __func__);
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@ -338,6 +517,7 @@ static void
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tpm_crb_deinit(void *sc)
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{
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struct tpm_crb *crb;
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int error;
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if (sc == NULL) {
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return;
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@ -352,6 +532,9 @@ tpm_crb_deinit(void *sc)
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pthread_cond_destroy(&crb->cond);
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pthread_mutex_destroy(&crb->mutex);
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error = tpm_crb_modify_mmio_registration(false, NULL);
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assert(error == 0);
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free(crb);
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}
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