cachepc-qemu

Fork of AMDESE/qemu with changes for cachepc side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-qemu
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tpm_ppi.c (1875B)

      1/*
      2 * tpm_ppi.c - TPM Physical Presence Interface
      3 *
      4 * Copyright (C) 2018 IBM Corporation
      5 *
      6 * Authors:
      7 *  Stefan Berger <stefanb@us.ibm.com>
      8 *
      9 * This work is licensed under the terms of the GNU GPL, version 2 or later.
     10 * See the COPYING file in the top-level directory.
     11 *
     12 */
     13
     14#include "qemu/osdep.h"
     15
     16#include "qapi/error.h"
     17#include "cpu.h"
     18#include "sysemu/memory_mapping.h"
     19#include "migration/vmstate.h"
     20#include "hw/acpi/tpm.h"
     21#include "tpm_ppi.h"
     22#include "trace.h"
     23
     24void tpm_ppi_reset(TPMPPI *tpmppi)
     25{
     26    if (tpmppi->buf[0x15a /* movv, docs/specs/tpm.rst */] & 0x1) {
     27        GuestPhysBlockList guest_phys_blocks;
     28        GuestPhysBlock *block;
     29
     30        guest_phys_blocks_init(&guest_phys_blocks);
     31        guest_phys_blocks_append(&guest_phys_blocks);
     32        QTAILQ_FOREACH(block, &guest_phys_blocks.head, next) {
     33            hwaddr mr_offs = block->host_addr -
     34                             (uint8_t *)memory_region_get_ram_ptr(block->mr);
     35
     36            trace_tpm_ppi_memset(block->host_addr,
     37                                 block->target_end - block->target_start);
     38            memset(block->host_addr, 0,
     39                   block->target_end - block->target_start);
     40            memory_region_set_dirty(block->mr, mr_offs,
     41                                    block->target_end - block->target_start);
     42        }
     43        guest_phys_blocks_free(&guest_phys_blocks);
     44    }
     45}
     46
     47void tpm_ppi_init(TPMPPI *tpmppi, struct MemoryRegion *m,
     48                  hwaddr addr, Object *obj)
     49{
     50    tpmppi->buf = qemu_memalign(qemu_real_host_page_size,
     51                                HOST_PAGE_ALIGN(TPM_PPI_ADDR_SIZE));
     52    memory_region_init_ram_device_ptr(&tpmppi->ram, obj, "tpm-ppi",
     53                                      TPM_PPI_ADDR_SIZE, tpmppi->buf);
     54    vmstate_register_ram(&tpmppi->ram, DEVICE(obj));
     55
     56    memory_region_add_subregion(m, addr, &tpmppi->ram);
     57}