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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yank_functions.c (1728B)

      1/*
      2 * migration yank functions
      3 *
      4 * Copyright (c) Lukas Straub <lukasstraub2@web.de>
      5 *
      6 * This work is licensed under the terms of the GNU GPL, version 2 or later.
      7 * See the COPYING file in the top-level directory.
      8 */
      9
     10#include "qemu/osdep.h"
     11#include "qapi/error.h"
     12#include "io/channel.h"
     13#include "yank_functions.h"
     14#include "qemu/yank.h"
     15#include "io/channel-socket.h"
     16#include "io/channel-tls.h"
     17#include "qemu-file.h"
     18
     19void migration_yank_iochannel(void *opaque)
     20{
     21    QIOChannel *ioc = QIO_CHANNEL(opaque);
     22
     23    qio_channel_shutdown(ioc, QIO_CHANNEL_SHUTDOWN_BOTH, NULL);
     24}
     25
     26/* Return whether yank is supported on this ioc */
     27static bool migration_ioc_yank_supported(QIOChannel *ioc)
     28{
     29    return object_dynamic_cast(OBJECT(ioc), TYPE_QIO_CHANNEL_SOCKET) ||
     30        object_dynamic_cast(OBJECT(ioc), TYPE_QIO_CHANNEL_TLS);
     31}
     32
     33void migration_ioc_register_yank(QIOChannel *ioc)
     34{
     35    if (migration_ioc_yank_supported(ioc)) {
     36        yank_register_function(MIGRATION_YANK_INSTANCE,
     37                               migration_yank_iochannel,
     38                               QIO_CHANNEL(ioc));
     39    }
     40}
     41
     42void migration_ioc_unregister_yank(QIOChannel *ioc)
     43{
     44    if (migration_ioc_yank_supported(ioc)) {
     45        yank_unregister_function(MIGRATION_YANK_INSTANCE,
     46                                 migration_yank_iochannel,
     47                                 QIO_CHANNEL(ioc));
     48    }
     49}
     50
     51void migration_ioc_unregister_yank_from_file(QEMUFile *file)
     52{
     53    QIOChannel *ioc = qemu_file_get_ioc(file);
     54
     55    if (ioc) {
     56        /*
     57         * For migration qemufiles, we'll always reach here.  Though we'll skip
     58         * calls from e.g. savevm/loadvm as they don't use yank.
     59         */
     60        migration_ioc_unregister_yank(ioc);
     61    }
     62}