1 /* 2 * Copyright © 2018, 2021 Oracle and/or its affiliates. 3 * 4 * This work is licensed under the terms of the GNU GPL, version 2 or later. 5 * See the COPYING file in the top-level directory. 6 * 7 */ 8 9 #include "qemu/osdep.h" 10 11 #include "qemu/compiler.h" 12 #include "qemu/int128.h" 13 #include "qemu/range.h" 14 #include "exec/memory.h" 15 #include "exec/cpu-common.h" 16 #include "exec/ram_addr.h" 17 #include "qapi/error.h" 18 #include "qemu/error-report.h" 19 #include "hw/remote/mpqemu-link.h" 20 #include "hw/remote/proxy-memory-listener.h" 21 22 /* 23 * TODO: get_fd_from_hostaddr(), proxy_mrs_can_merge() and 24 * proxy_memory_listener_commit() defined below perform tasks similar to the 25 * functions defined in vhost-user.c. These functions are good candidates 26 * for refactoring. 27 * 28 */ 29 30 static void proxy_memory_listener_reset(MemoryListener *listener) 31 { 32 ProxyMemoryListener *proxy_listener = container_of(listener, 33 ProxyMemoryListener, 34 listener); 35 int mrs; 36 37 for (mrs = 0; mrs < proxy_listener->n_mr_sections; mrs++) { 38 memory_region_unref(proxy_listener->mr_sections[mrs].mr); 39 } 40 41 g_free(proxy_listener->mr_sections); 42 proxy_listener->mr_sections = NULL; 43 proxy_listener->n_mr_sections = 0; 44 } 45 46 static int get_fd_from_hostaddr(uint64_t host, ram_addr_t *offset) 47 { 48 MemoryRegion *mr; 49 ram_addr_t off; 50 51 /** 52 * Assumes that the host address is a valid address as it's 53 * coming from the MemoryListener system. In the case host 54 * address is not valid, the following call would return 55 * the default subregion of "system_memory" region, and 56 * not NULL. So it's not possible to check for NULL here. 57 */ 58 mr = memory_region_from_host((void *)(uintptr_t)host, &off); 59 60 if (offset) { 61 *offset = off; 62 } 63 64 return memory_region_get_fd(mr); 65 } 66 67 static bool proxy_mrs_can_merge(uint64_t host, uint64_t prev_host, size_t size) 68 { 69 if (((prev_host + size) != host)) { 70 return false; 71 } 72 73 if (get_fd_from_hostaddr(host, NULL) != 74 get_fd_from_hostaddr(prev_host, NULL)) { 75 return false; 76 } 77 78 return true; 79 } 80 81 static bool try_merge(ProxyMemoryListener *proxy_listener, 82 MemoryRegionSection *section) 83 { 84 uint64_t mrs_size, mrs_gpa, mrs_page; 85 MemoryRegionSection *prev_sec; 86 bool merged = false; 87 uintptr_t mrs_host; 88 RAMBlock *mrs_rb; 89 90 if (!proxy_listener->n_mr_sections) { 91 return false; 92 } 93 94 mrs_rb = section->mr->ram_block; 95 mrs_page = (uint64_t)qemu_ram_pagesize(mrs_rb); 96 mrs_size = int128_get64(section->size); 97 mrs_gpa = section->offset_within_address_space; 98 mrs_host = (uintptr_t)memory_region_get_ram_ptr(section->mr) + 99 section->offset_within_region; 100 101 if (get_fd_from_hostaddr(mrs_host, NULL) < 0) { 102 return true; 103 } 104 105 mrs_host = mrs_host & ~(mrs_page - 1); 106 mrs_gpa = mrs_gpa & ~(mrs_page - 1); 107 mrs_size = ROUND_UP(mrs_size, mrs_page); 108 109 prev_sec = proxy_listener->mr_sections + 110 (proxy_listener->n_mr_sections - 1); 111 uint64_t prev_gpa_start = prev_sec->offset_within_address_space; 112 uint64_t prev_size = int128_get64(prev_sec->size); 113 uint64_t prev_gpa_end = range_get_last(prev_gpa_start, prev_size); 114 uint64_t prev_host_start = 115 (uintptr_t)memory_region_get_ram_ptr(prev_sec->mr) + 116 prev_sec->offset_within_region; 117 uint64_t prev_host_end = range_get_last(prev_host_start, prev_size); 118 119 if (mrs_gpa <= (prev_gpa_end + 1)) { 120 g_assert(mrs_gpa > prev_gpa_start); 121 122 if ((section->mr == prev_sec->mr) && 123 proxy_mrs_can_merge(mrs_host, prev_host_start, 124 (mrs_gpa - prev_gpa_start))) { 125 uint64_t max_end = MAX(prev_host_end, mrs_host + mrs_size); 126 merged = true; 127 prev_sec->offset_within_address_space = 128 MIN(prev_gpa_start, mrs_gpa); 129 prev_sec->offset_within_region = 130 MIN(prev_host_start, mrs_host) - 131 (uintptr_t)memory_region_get_ram_ptr(prev_sec->mr); 132 prev_sec->size = int128_make64(max_end - MIN(prev_host_start, 133 mrs_host)); 134 } 135 } 136 137 return merged; 138 } 139 140 static void proxy_memory_listener_region_addnop(MemoryListener *listener, 141 MemoryRegionSection *section) 142 { 143 ProxyMemoryListener *proxy_listener = container_of(listener, 144 ProxyMemoryListener, 145 listener); 146 147 if (!memory_region_is_ram(section->mr) || 148 memory_region_is_rom(section->mr)) { 149 return; 150 } 151 152 if (try_merge(proxy_listener, section)) { 153 return; 154 } 155 156 ++proxy_listener->n_mr_sections; 157 proxy_listener->mr_sections = g_renew(MemoryRegionSection, 158 proxy_listener->mr_sections, 159 proxy_listener->n_mr_sections); 160 proxy_listener->mr_sections[proxy_listener->n_mr_sections - 1] = *section; 161 proxy_listener->mr_sections[proxy_listener->n_mr_sections - 1].fv = NULL; 162 memory_region_ref(section->mr); 163 } 164 165 static void proxy_memory_listener_commit(MemoryListener *listener) 166 { 167 ProxyMemoryListener *proxy_listener = container_of(listener, 168 ProxyMemoryListener, 169 listener); 170 MPQemuMsg msg; 171 MemoryRegionSection *section; 172 ram_addr_t offset; 173 uintptr_t host_addr; 174 int region; 175 Error *local_err = NULL; 176 177 memset(&msg, 0, sizeof(MPQemuMsg)); 178 179 msg.cmd = MPQEMU_CMD_SYNC_SYSMEM; 180 msg.num_fds = proxy_listener->n_mr_sections; 181 msg.size = sizeof(SyncSysmemMsg); 182 if (msg.num_fds > REMOTE_MAX_FDS) { 183 error_report("Number of fds is more than %d", REMOTE_MAX_FDS); 184 return; 185 } 186 187 for (region = 0; region < proxy_listener->n_mr_sections; region++) { 188 section = &proxy_listener->mr_sections[region]; 189 msg.data.sync_sysmem.gpas[region] = 190 section->offset_within_address_space; 191 msg.data.sync_sysmem.sizes[region] = int128_get64(section->size); 192 host_addr = (uintptr_t)memory_region_get_ram_ptr(section->mr) + 193 section->offset_within_region; 194 msg.fds[region] = get_fd_from_hostaddr(host_addr, &offset); 195 msg.data.sync_sysmem.offsets[region] = offset; 196 } 197 if (!mpqemu_msg_send(&msg, proxy_listener->ioc, &local_err)) { 198 error_report_err(local_err); 199 } 200 } 201 202 void proxy_memory_listener_deconfigure(ProxyMemoryListener *proxy_listener) 203 { 204 memory_listener_unregister(&proxy_listener->listener); 205 206 proxy_memory_listener_reset(&proxy_listener->listener); 207 } 208 209 void proxy_memory_listener_configure(ProxyMemoryListener *proxy_listener, 210 QIOChannel *ioc) 211 { 212 proxy_listener->n_mr_sections = 0; 213 proxy_listener->mr_sections = NULL; 214 215 proxy_listener->ioc = ioc; 216 217 proxy_listener->listener.begin = proxy_memory_listener_reset; 218 proxy_listener->listener.commit = proxy_memory_listener_commit; 219 proxy_listener->listener.region_add = proxy_memory_listener_region_addnop; 220 proxy_listener->listener.region_nop = proxy_memory_listener_region_addnop; 221 proxy_listener->listener.priority = 10; 222 proxy_listener->listener.name = "proxy"; 223 224 memory_listener_register(&proxy_listener->listener, 225 &address_space_memory); 226 } 227