Hi Mazen,
On 06/06/2013 08:47 AM, Mazen Ezzeddine wrote:
I am new to Gem5, please advise me about the following issues. Note
that I am running x86_64 GNU-Linux.
*
Suppose that we are running a guest VM, say ARM_Linux, emulated
using Gem5. Does the guest OS running inside the VM execute in
privileged or user mode.
gem5 itself will execute as a normal user-space application, while the
guest system (ARM Linux in your case) will run in a simulated privileged
mode. From the guest system's point of view, there should be no
difference between executing in gem5 and on real hardware.
There is currently some work to enable gem5 to use the KVM (hardware
virtualization) infrastructure in Linux to enable faster simulation,
which slightly changes this. However, that shouldn't affect what the
guest sees.
*
Using Gem5, can I execute *simultaneously* two different VMs (ex.
ARM_Linux and x86_Linux) on the same host platform. Note that I am
not concerned about performance of the VMs being executed.
It is currently not possible to simulate two CPUs of different ISAs
using the same gem5 binary. In practice, that means that you can't
simulate a heterogeneous system with shared memory (e.g., x86+ARM) or
even separate systems with different CPUs in the same simulator
instance. That's a limitation in the way gem5 is currently structured
and there is no easy fix.
//Andreas
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