linux qemu 报错 Unable to reserve 0xfffff000 bytes of virtual address space at 0x1000 解决方法

错误现象

可能原因

解决过程

解决方法

错误现象

使用 qemu-i686 运行 i686平台文件报错

qemu-i686: Unable to reserve 0xfffff000 bytes of virtual address space at 0x1000 (Success) for use as guest address space (check yourvirtual memory ulimit setting, min_mmap_addr or reserve less using -R option)

过程如下：

[root@localhost src]# /usr/local/qemu/bin/qemu-i686 test
qemu-i686: Unable to reserve 0xfffff000 bytes of virtual address space at 0x1000 (Success) for use as guest address space (check yourvirtual memory ulimit setting, min_mmap_addr or reserve less using -R option)

可能原因

Linux的虚拟地址空间范围为0～4G，Linux内核将这4G字节的空间分为两部分，将最高的1G字节（从虚拟地址0xC0000000到0xFFFFFFFF）供内核使用，称为“内核空间”。而将较低的3G字节（从虚拟地址0x00000000到0xBFFFFFFF）供各个进程使用，称为“用户空间。

运行错误提示，使用的内存地址0xfffff000，不是用户空间内存地址，需要设置进程起始内存地址，具体原理可以参考《linux 进程地址空间内存分布简介》blog.csdn.net/whatday/article/details/122274743

解决过程

查看 qemu 帮助版本

[root@localhost src]# /usr/local/qemu/bin/qemu-i686 --help
usage: qemu-i386 [options] program [arguments...]
Linux CPU emulator (compiled for i386 emulation)Options and associated environment variables:Argument             Env-variable      Description
-h                                     print this help
-help
-g port              QEMU_GDB          wait gdb connection to 'port'
-L path              QEMU_LD_PREFIX    set the elf interpreter prefix to 'path'
-s size              QEMU_STACK_SIZE   set the stack size to 'size' bytes
-cpu model           QEMU_CPU          select CPU (-cpu help for list)
-E var=value         QEMU_SET_ENV      sets targets environment variable (see below)
-U var               QEMU_UNSET_ENV    unsets targets environment variable (see below)
-0 argv0             QEMU_ARGV0        forces target process argv[0] to be 'argv0'
-r uname             QEMU_UNAME        set qemu uname release string to 'uname'
-B address           QEMU_GUEST_BASE   set guest_base address to 'address'
-R size              QEMU_RESERVED_VA  reserve 'size' bytes for guest virtual address space
-d item[,...]        QEMU_LOG          enable logging of specified items (use '-d help' for a list of items)
-dfilter range[,...] QEMU_DFILTER      filter logging based on address range
-D logfile           QEMU_LOG_FILENAME write logs to 'logfile' (default stderr)
-p pagesize          QEMU_PAGESIZE     set the host page size to 'pagesize'
-singlestep          QEMU_SINGLESTEP   run in singlestep mode
-strace              QEMU_STRACE       log system calls
-seed                QEMU_RAND_SEED    Seed for pseudo-random number generator
-trace               QEMU_TRACE        [[enable=]<pattern>][,events=<file>][,file=<file>]
-plugin              QEMU_PLUGIN       [file=]<file>[,<argname>=<argvalue>]
-version             QEMU_VERSION      display version information and exitDefaults:
QEMU_LD_PREFIX  = /usr/gnemul/qemu-i386
QEMU_STACK_SIZE = 8388608 byteYou can use -E and -U options or the QEMU_SET_ENV and
QEMU_UNSET_ENV environment variables to set and unset
environment variables for the target process.
It is possible to provide several variables by separating them
by commas in getsubopt(3) style. Additionally it is possible to
provide the -E and -U options multiple times.
The following lines are equivalent:-E var1=val2 -E var2=val2 -U LD_PRELOAD -U LD_DEBUG-E var1=val2,var2=val2 -U LD_PRELOAD,LD_DEBUGQEMU_SET_ENV=var1=val2,var2=val2 QEMU_UNSET_ENV=LD_PRELOAD,LD_DEBUG
Note that if you provide several changes to a single variable
the last change will stay in effect.See <https://qemu.org/contribute/report-a-bug> for how to report bugs.
More information on the QEMU project at <https://qemu.org>.[root@localhost src]# /usr/local/qemu/bin/qemu-i686 -version
qemu-i386 version 6.2.0

发现选项 -B address

set guest_base address to 'address'

设置guest_base地址为“address”

这个选项比较适合

解决方法

[root@localhost src]# /usr/local/qemu/bin/qemu-i686 -B 0x10000000 test

成功运行