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 18 static 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 32 void 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 } 64