qemu

FORK: QEMU emulator
git clone https://git.neptards.moe/neptards/qemu.git
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memory.c (1734B)

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