system/physmem-qmp-cmds.c

/*
 * QMP commands to dump physical memory
 *
 * Copyright (c) 2003-2008 Fabrice Bellard
 * Copyright (c) Qualcomm Technologies, Inc. and/or its subsidiaries.
 *
 * SPDX-License-Identifier: GPL-2.0-or-later
 */

#include "qemu/osdep.h"
#include "qapi/error.h"
#include "qapi/qapi-commands-machine.h"
#include "qapi/qmp/qerror.h"
#include "hw/core/cpu.h"
#include "system/physmem.h"
#include "migration/misc.h"

void qmp_memsave(uint64_t addr, uint64_t size, const char *filename,
                 bool has_cpu, int64_t cpu_index, Error **errp)
{
    FILE *f;
    uint64_t l;
    CPUState *cpu;
    uint8_t buf[1024];
    uint64_t orig_addr = addr, orig_size = size;

    if (migration_guest_ram_loading()) {
        error_setg(errp, "Guest memory access not allowed during migration");
        return;
    }

    if (!has_cpu) {
        cpu_index = 0;
    }

    cpu = qemu_get_cpu(cpu_index);
    if (cpu == NULL) {
        error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "cpu-index",
                   "a CPU number");
        return;
    }

    f = fopen(filename, "wb");
    if (!f) {
        error_setg_file_open(errp, errno, filename);
        return;
    }

    while (size != 0) {
        l = sizeof(buf);
        if (l > size) {
            l = size;
        }
        if (cpu_memory_rw_debug(cpu, addr, buf, l, 0) != 0) {
            error_setg(errp, "Invalid addr 0x%016" PRIx64 "/size %" PRIu64
                             " specified", orig_addr, orig_size);
            goto exit;
        }
        if (fwrite(buf, 1, l, f) != l) {
            error_setg(errp, "writing memory to '%s' failed",
                       filename);
            goto exit;
        }
        addr += l;
        size -= l;
    }

exit:
    fclose(f);
}

void qmp_pmemsave(uint64_t addr, uint64_t size, const char *filename,
                  Error **errp)
{
    FILE *f;
    uint64_t l;
    uint8_t buf[1024];

    if (migration_guest_ram_loading()) {
        error_setg(errp, "Guest memory access not allowed during migration");
        return;
    }

    f = fopen(filename, "wb");
    if (!f) {
        error_setg_file_open(errp, errno, filename);
        return;
    }

    while (size != 0) {
        l = sizeof(buf);
        if (l > size) {
            l = size;
        }
        physical_memory_read(addr, buf, l);
        if (fwrite(buf, 1, l, f) != l) {
            error_setg(errp, "writing memory to '%s' failed",
                       filename);
            goto exit;
        }
        addr += l;
        size -= l;
    }

exit:
    fclose(f);
}