Hi All:
My GEM5 V21.1.0.2 running on aarch64 server, but when I compile 
bitunion.test.opt, the compilation print will show "Info: KVM for null not 
supported on arm host."

    scons build/NULL/base/bitunion.test.opt -j120
scons: Reading SConscript files ...
Checking for linker -Wl,--as-needed support... (cached) yes
Warning: While checking protoc version: [Errno 2] No such file or directory: 
'protoc'
Warning: Protocol buffer compiler (protoc) not found.
         Please install protobuf-compiler for tracing support.
Checking for compiler -gz support... (cached) yes
Checking for linker -gz support... (cached) yes
Info: Using Python config: python3-config
Checking for C header file Python.h... (cached) yes
Checking for C library python3.8... (cached) yes
Checking for C library crypt... (cached) yes
Checking for C library pthread... (cached) yes
Checking for C library dl... (cached) yes
Checking for C library util... (cached) yes
Checking for C library m... (cached) yes
Checking Python version... (cached) 3.8.5
Checking for accept(0,0,0) in C++ library None... (cached) yes
Checking for zlibVersion() in C++ library z... (cached) yes
Checking for C header file valgrind/valgrind.h... (cached) no
Checking for clock_nanosleep(0,0,NULL,NULL) in C library None... (cached) yes
Checking for timer_create(CLOCK_MONOTONIC, NULL, NULL) in C library None... 
(cached) no
Checking for timer_create(CLOCK_MONOTONIC, NULL, NULL) in C library rt... 
(cached) yes
Checking for C library tcmalloc... (cached) yes
Checking for char temp; backtrace_symbols_fd((void *)&temp, 0, 0) in C library 
None... (cached) yes
Checking for C header file fenv.h... (cached) yes
Checking for C header file png.h... (cached) yes
Checking for C header file linux/kvm.h... (cached) yes
Checking for C header file linux/if_tun.h... (cached) yes
Checking for member exclude_host in struct perf_event_attr...(cached) yes
Checking for H5Fcreate("", 0, 0, 0) in C library hdf5... (cached) no
Warning: Couldn't find any HDF5 C++ libraries. Disabling HDF5 support.
Checking whether __i386__ is declared... (cached) no
Checking whether __x86_64__ is declared... (cached) no
Warning: Unrecognized architecture for systemc.
Building in /home/l00515693/KSim_LightESL/build/NULL
Variables file /home/l00515693/KSim_LightESL/build/variables/NULL not found,
  using defaults in /home/l00515693/KSim_LightESL/build_opts/NULL
Info: KVM for null not supported on arm host.
scons: done reading SConscript files.
scons: Building targets ...


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