Jagannathan Raman | c746b74 | 2021-01-29 11:46:18 -0500 | [diff] [blame] | 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" |
Jagannathan Raman | c746b74 | 2021-01-29 11:46:18 -0500 | [diff] [blame] | 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" |
Jagannathan Raman | c746b74 | 2021-01-29 11:46:18 -0500 | [diff] [blame] | 16 | #include "exec/ram_addr.h" |
Jagannathan Raman | c746b74 | 2021-01-29 11:46:18 -0500 | [diff] [blame] | 17 | #include "qapi/error.h" |
Philippe Mathieu-Daudé | 83bb745 | 2022-02-07 09:27:49 +0100 | [diff] [blame] | 18 | #include "qemu/error-report.h" |
Jagannathan Raman | c746b74 | 2021-01-29 11:46:18 -0500 | [diff] [blame] | 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; |
Peter Xu | 142518b | 2021-08-16 21:35:52 -0400 | [diff] [blame] | 222 | proxy_listener->listener.name = "proxy"; |
Jagannathan Raman | c746b74 | 2021-01-29 11:46:18 -0500 | [diff] [blame] | 223 | |
| 224 | memory_listener_register(&proxy_listener->listener, |
| 225 | &address_space_memory); |
| 226 | } |