| 1 | /* |
| 2 | * QEMU Plugin API - System specific implementations |
| 3 | * |
| 4 | * This provides the APIs that have a specific system implementation |
| 5 | * or are only relevant to system-mode. |
| 6 | * |
| 7 | * Copyright (C) 2017, Emilio G. Cota <cota@braap.org> |
| 8 | * Copyright (C) 2019-2025, Linaro |
| 9 | * |
| 10 | * SPDX-License-Identifier: GPL-2.0-or-later |
| 11 | */ |
| 12 | |
| 13 | #include "qemu/osdep.h" |
| 14 | #include "qemu/main-loop.h" |
| 15 | #include "qapi/error.h" |
| 16 | #include "migration/blocker.h" |
| 17 | #include "hw/core/boards.h" |
| 18 | #include "qemu/plugin-memory.h" |
| 19 | #include "qemu/plugin.h" |
| 20 | |
| 21 | /* |
| 22 | * In system mode we cannot trace the binary being executed so the |
| 23 | * helpers all return NULL/0. |
| 24 | */ |
| 25 | const char *qemu_plugin_path_to_binary(void) |
| 26 | { |
| 27 | return NULL; |
| 28 | } |
| 29 | |
| 30 | uint64_t qemu_plugin_start_code(void) |
| 31 | { |
| 32 | return 0; |
| 33 | } |
| 34 | |
| 35 | uint64_t qemu_plugin_end_code(void) |
| 36 | { |
| 37 | return 0; |
| 38 | } |
| 39 | |
| 40 | uint64_t qemu_plugin_entry_code(void) |
| 41 | { |
| 42 | return 0; |
| 43 | } |
| 44 | |
| 45 | /* |
| 46 | * Virtual Memory queries |
| 47 | */ |
| 48 | |
| 49 | static __thread struct qemu_plugin_hwaddr hwaddr_info; |
| 50 | |
| 51 | struct qemu_plugin_hwaddr *qemu_plugin_get_hwaddr(qemu_plugin_meminfo_t info, |
| 52 | uint64_t vaddr) |
| 53 | { |
| 54 | CPUState *cpu = current_cpu; |
| 55 | unsigned int mmu_idx = get_mmuidx(info); |
| 56 | enum qemu_plugin_mem_rw rw = get_plugin_meminfo_rw(info); |
| 57 | hwaddr_info.is_store = (rw & QEMU_PLUGIN_MEM_W) != 0; |
| 58 | |
| 59 | assert(mmu_idx < NB_MMU_MODES); |
| 60 | |
| 61 | if (!tlb_plugin_lookup(cpu, vaddr, mmu_idx, |
| 62 | hwaddr_info.is_store, &hwaddr_info)) { |
| 63 | error_report("invalid use of qemu_plugin_get_hwaddr"); |
| 64 | return NULL; |
| 65 | } |
| 66 | |
| 67 | return &hwaddr_info; |
| 68 | } |
| 69 | |
| 70 | bool qemu_plugin_hwaddr_is_io(const struct qemu_plugin_hwaddr *haddr) |
| 71 | { |
| 72 | return haddr->is_io; |
| 73 | } |
| 74 | |
| 75 | uint64_t qemu_plugin_hwaddr_phys_addr(const struct qemu_plugin_hwaddr *haddr) |
| 76 | { |
| 77 | if (haddr) { |
| 78 | return haddr->phys_addr; |
| 79 | } |
| 80 | return 0; |
| 81 | } |
| 82 | |
| 83 | const char *qemu_plugin_hwaddr_device_name(const struct qemu_plugin_hwaddr *h) |
| 84 | { |
| 85 | if (h && h->is_io) { |
| 86 | MemoryRegion *mr = h->mr; |
| 87 | if (!mr->name) { |
| 88 | unsigned maddr = (uintptr_t)mr; |
| 89 | g_autofree char *temp = g_strdup_printf("anon%08x", maddr); |
| 90 | return g_intern_string(temp); |
| 91 | } else { |
| 92 | return g_intern_string(mr->name); |
| 93 | } |
| 94 | } else { |
| 95 | return g_intern_static_string("RAM"); |
| 96 | } |
| 97 | } |
| 98 | |
| 99 | /* |
| 100 | * Time control |
| 101 | */ |
| 102 | static bool has_control; |
| 103 | static Error *migration_blocker; |
| 104 | |
| 105 | const void *qemu_plugin_request_time_control(void) |
| 106 | { |
| 107 | if (!has_control) { |
| 108 | has_control = true; |
| 109 | error_setg(&migration_blocker, |
| 110 | "TCG plugin time control does not support migration"); |
| 111 | migrate_add_blocker(&migration_blocker, &error_fatal); |
| 112 | return &has_control; |
| 113 | } |
| 114 | return NULL; |
| 115 | } |
| 116 | |
| 117 | static void advance_virtual_time__async(CPUState *cpu, run_on_cpu_data data) |
| 118 | { |
| 119 | int64_t new_time = data.host_ulong; |
| 120 | qemu_clock_advance_virtual_time(new_time); |
| 121 | } |
| 122 | |
| 123 | void qemu_plugin_update_ns(const void *handle, int64_t new_time) |
| 124 | { |
| 125 | if (handle == &has_control) { |
| 126 | /* Need to execute out of cpu_exec, so bql can be locked. */ |
| 127 | async_run_on_cpu(current_cpu, |
| 128 | advance_virtual_time__async, |
| 129 | RUN_ON_CPU_HOST_ULONG(new_time)); |
| 130 | } |
| 131 | } |