How is QEMU different from a "real" processor and which is faster?

Question

linux

On VPS hosting, the new tariffs show QEMU instead of the "real" processor:

# cat /proc/cpuinfo
Tariff 1: Intel(R) Xeon(R) Silver 4214 CPU @ 2.20GHz
Tariff 2: QEMU Virtual CPU version 2.5+

In both cases - KVM.
Why is the processor shown as QEMU in the second case? I found a mention in various sources that this is processor emulation and that it works much slower. This is true?
In other sources, QEMU and KVM are essentially the same thing. But then it's strange why in the first case I see the name of the real processor, and not "Virtual CPU"

Answer 1

In kvm/libvirt, you can forward the processor in different ways, limiting its functionality or not. On performance, if it affects, it is usually not very strong. But it would always be good to clarify what exactly was thrown, using the processor flags in the same output for diagnostics. Well, no one canceled their own performance tests!

Answer 2

QEMU can both programmatically emulate a processor (including a different architecture where this is done) and run programs on a real processor. Other virtual machine managers such as WMWare and VirtualBox are only the second option.
What the hoster understands by his own words - only he knows.