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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vmcoreinfo.c (3271B)

      1/*
      2 * Virtual Machine coreinfo device
      3 *
      4 * Copyright (C) 2017 Red Hat, Inc.
      5 *
      6 * Authors: Marc-André Lureau <marcandre.lureau@redhat.com>
      7 *
      8 * This work is licensed under the terms of the GNU GPL, version 2 or later.
      9 * See the COPYING file in the top-level directory.
     10 *
     11 */
     12
     13#include "qemu/osdep.h"
     14#include "qapi/error.h"
     15#include "qemu/module.h"
     16#include "sysemu/reset.h"
     17#include "hw/nvram/fw_cfg.h"
     18#include "migration/vmstate.h"
     19#include "hw/misc/vmcoreinfo.h"
     20
     21static void fw_cfg_vmci_write(void *dev, off_t offset, size_t len)
     22{
     23    VMCoreInfoState *s = VMCOREINFO(dev);
     24
     25    s->has_vmcoreinfo = offset == 0 && len == sizeof(s->vmcoreinfo)
     26        && s->vmcoreinfo.guest_format != FW_CFG_VMCOREINFO_FORMAT_NONE;
     27}
     28
     29static void vmcoreinfo_reset(void *dev)
     30{
     31    VMCoreInfoState *s = VMCOREINFO(dev);
     32
     33    s->has_vmcoreinfo = false;
     34    memset(&s->vmcoreinfo, 0, sizeof(s->vmcoreinfo));
     35    s->vmcoreinfo.host_format = cpu_to_le16(FW_CFG_VMCOREINFO_FORMAT_ELF);
     36}
     37
     38static void vmcoreinfo_realize(DeviceState *dev, Error **errp)
     39{
     40    VMCoreInfoState *s = VMCOREINFO(dev);
     41    FWCfgState *fw_cfg = fw_cfg_find();
     42    /* for gdb script dump-guest-memory.py */
     43    static VMCoreInfoState * volatile vmcoreinfo_state G_GNUC_UNUSED;
     44
     45    /* Given that this function is executing, there is at least one VMCOREINFO
     46     * device. Check if there are several.
     47     */
     48    if (!vmcoreinfo_find()) {
     49        error_setg(errp, "at most one %s device is permitted",
     50                   VMCOREINFO_DEVICE);
     51        return;
     52    }
     53
     54    if (!fw_cfg || !fw_cfg->dma_enabled) {
     55        error_setg(errp, "%s device requires fw_cfg with DMA",
     56                   VMCOREINFO_DEVICE);
     57        return;
     58    }
     59
     60    fw_cfg_add_file_callback(fw_cfg, FW_CFG_VMCOREINFO_FILENAME,
     61                             NULL, fw_cfg_vmci_write, s,
     62                             &s->vmcoreinfo, sizeof(s->vmcoreinfo), false);
     63
     64    /*
     65     * This device requires to register a global reset because it is
     66     * not plugged to a bus (which, as its QOM parent, would reset it).
     67     */
     68    qemu_register_reset(vmcoreinfo_reset, dev);
     69    vmcoreinfo_state = s;
     70}
     71
     72static const VMStateDescription vmstate_vmcoreinfo = {
     73    .name = "vmcoreinfo",
     74    .version_id = 1,
     75    .minimum_version_id = 1,
     76    .fields = (VMStateField[]) {
     77        VMSTATE_BOOL(has_vmcoreinfo, VMCoreInfoState),
     78        VMSTATE_UINT16(vmcoreinfo.host_format, VMCoreInfoState),
     79        VMSTATE_UINT16(vmcoreinfo.guest_format, VMCoreInfoState),
     80        VMSTATE_UINT32(vmcoreinfo.size, VMCoreInfoState),
     81        VMSTATE_UINT64(vmcoreinfo.paddr, VMCoreInfoState),
     82        VMSTATE_END_OF_LIST()
     83    },
     84};
     85
     86static void vmcoreinfo_device_class_init(ObjectClass *klass, void *data)
     87{
     88    DeviceClass *dc = DEVICE_CLASS(klass);
     89
     90    dc->vmsd = &vmstate_vmcoreinfo;
     91    dc->realize = vmcoreinfo_realize;
     92    dc->hotpluggable = false;
     93    set_bit(DEVICE_CATEGORY_MISC, dc->categories);
     94}
     95
     96static const TypeInfo vmcoreinfo_device_info = {
     97    .name          = VMCOREINFO_DEVICE,
     98    .parent        = TYPE_DEVICE,
     99    .instance_size = sizeof(VMCoreInfoState),
    100    .class_init    = vmcoreinfo_device_class_init,
    101};
    102
    103static void vmcoreinfo_register_types(void)
    104{
    105    type_register_static(&vmcoreinfo_device_info);
    106}
    107
    108type_init(vmcoreinfo_register_types)