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Re: [Qemu-devel] did the qemu can emulate the whole system with the proc

From: Li Zhijian
Subject: Re: [Qemu-devel] did the qemu can emulate the whole system with the processor that without support the "virtulization and kvm"?
Date: Fri, 21 Dec 2018 22:03:31 +0800
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.2.1

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.

"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.


so from the answer you give to me, it is feasible, right?

thanks very much!

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)

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