Re: [Qemu-devel] did the qemu can emulate the whole system with the processor that without support the "virtulization and kvm"?

[Li Zhijian]

On 12/21/18 19:40, tugouxp wrote:
> thank you.
>   
> i just want to confirm one thing,  that is whether the qemu can emulate a whole operation system just by analysis instructions by instructions manually  without the support of KVM.

IIUC，
"operation system" often means a software but QEMU usually emulates hardwares, 
including cpus, memory, NIC, etc.
Please know that QEMU born earlier than KVM, so QEMU can work well without KVM.

Thanks


> so from the answer you give to me, it is feasible, right?
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> thanks very much!
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> At 2018-12-21 17:01:02, "Alex Bennée" <address@hidden> wrote:
> > tugouxp <address@hidden> writes:
> >
> > > Hi alex:
> > >      now my host machine did not have the "/dev/kvm" nodes and no chance to 
> > > make it exists.
> > > so i want to know whether the "/dev/kvm" is  mandatory  for qemu to emulate the 
> > > whole system.
> > > so i can make the emulation without the support of kvm mechanism.
> > QEMU runs in two modes - full system emulation with TCG doesn't require
> > KVM although it is relatively slow. On systems where there guest
> > architecture is the same as the host architecture you can run with KMV
> > (or HAX/WHPX/HVF) accelerators at near native speeds.
> >
> > The reasons for not having a /dev/kvm can vary but you haven't said what
> > your host architecture is and what OS you are running so it's hard to
> > offer advice here.
> >
> > --
> > Alex Bennée
--
Best regards.
Li Zhijian (8528)