cachepc-qemu

Fork of AMDESE/qemu with changes for cachepc side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-qemu
Log | Files | Refs | Submodules | LICENSE | sfeed.txt

memory.c (1759B)

      1/*
      2 * Memory manager for remote device
      3 *
      4 * Copyright © 2018, 2021 Oracle and/or its affiliates.
      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
     11#include "qemu/osdep.h"
     12#include "qemu-common.h"
     13
     14#include "hw/remote/memory.h"
     15#include "exec/ram_addr.h"
     16#include "qapi/error.h"
     17
     18static void remote_sysmem_reset(void)
     19{
     20    MemoryRegion *sysmem, *subregion, *next;
     21
     22    sysmem = get_system_memory();
     23
     24    QTAILQ_FOREACH_SAFE(subregion, &sysmem->subregions, subregions_link, next) {
     25        if (subregion->ram) {
     26            memory_region_del_subregion(sysmem, subregion);
     27            object_unparent(OBJECT(subregion));
     28        }
     29    }
     30}
     31
     32void remote_sysmem_reconfig(MPQemuMsg *msg, Error **errp)
     33{
     34    ERRP_GUARD();
     35    SyncSysmemMsg *sysmem_info = &msg->data.sync_sysmem;
     36    MemoryRegion *sysmem, *subregion;
     37    static unsigned int suffix;
     38    int region;
     39
     40    sysmem = get_system_memory();
     41
     42    remote_sysmem_reset();
     43
     44    for (region = 0; region < msg->num_fds; region++, suffix++) {
     45        g_autofree char *name = g_strdup_printf("remote-mem-%u", suffix);
     46        subregion = g_new(MemoryRegion, 1);
     47        memory_region_init_ram_from_fd(subregion, NULL,
     48                                       name, sysmem_info->sizes[region],
     49                                       RAM_SHARED, msg->fds[region],
     50                                       sysmem_info->offsets[region],
     51                                       errp);
     52
     53        if (*errp) {
     54            g_free(subregion);
     55            remote_sysmem_reset();
     56            return;
     57        }
     58
     59        memory_region_add_subregion(sysmem, sysmem_info->gpas[region],
     60                                    subregion);
     61
     62    }
     63}