KVM or Qemu

Jamie Fargen <jfargen@xxxxxxxxx> · Mon, 12 Mar 2018 15:24:58 -0400

List-
I know this may be slightly off topic and if so tell me to hit up the emu-discuss mailing list, but does anyone know how to detect the difference between a guest that is being fully emulates using qemu and a guest that is running para-virtualized using KVM?

I have and when I inspect the CPUs I see the following....

# cat /proc/cpuinfo 
processor	: 0
vendor_id	: GenuineIntel
cpu family	: 6
model		: 13
model name	: QEMU Virtual CPU version 1.5.3
stepping	: 3
microcode	: 0x1
cpu MHz		: 1995.312
cache size	: 4096 KB
physical id	: 0
siblings	: 1
core id		: 0
cpu cores	: 1
apicid		: 0
initial apicid	: 0
fpu		: yes
fpu_exception	: yes
cpuid level	: 4
wp		: yes
flags		: fpu de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pse36 clflush mmx fxsr sse sse2 syscall nx lm rep_good nopl pni cx16 hypervisor lahf_lm abm
bogomips	: 3990.62
clflush size	: 64
cache_alignment	: 64
address sizes	: 46 bits physical, 48 bits virtual
power management:

# dmidecode 
# dmidecode 2.12-dmifs
SMBIOS 2.4 present.
10 structures occupying 326 bytes.
Table at 0x000F7190.

Handle 0x0000, DMI type 0, 24 bytes
BIOS Information
	Vendor: Seabios
	Version: 0.5.1
	Release Date: 01/01/2011
	Address: 0xE8000
	Runtime Size: 96 kB
	ROM Size: 64 kB
	Characteristics:
		BIOS characteristics not supported
		Targeted content distribution is supported
	BIOS Revision: 1.0

Handle 0x0100, DMI type 1, 27 bytes
System Information
	Manufacturer: Red Hat
	Product Name: KVM
	Version: RHEL 7.0.0 PC (i440FX + PIIX, 1996)
	Serial Number: Not Specified
	UUID: 1851A1FE-5ABB-42BD-B651-1A5931ADEE40
	Wake-up Type: Power Switch
	SKU Number: Not Specified
	Family: Red Hat Enterprise Linux

Handle 0x0300, DMI type 3, 20 bytes
Chassis Information
	Manufacturer: Bochs
	Type: Other
	Lock: Not Present
	Version: Not Specified
	Serial Number: Not Specified
	Asset Tag: Not Specified
	Boot-up State: Safe
	Power Supply State: Safe
	Thermal State: Safe
	Security Status: Unknown
	OEM Information: 0x00000000
	Height: Unspecified
	Number Of Power Cords: Unspecified

Handle 0x0401, DMI type 4, 32 bytes
Processor Information
	Socket Designation: CPU 1
	Type: Central Processor
	Family: Other
	Manufacturer: Bochs
	ID: D3 06 00 00 FD FB 8B 07
	Version: Not Specified
	Voltage: Unknown
	External Clock: Unknown
	Max Speed: 2000 MHz
	Current Speed: 2000 MHz
	Status: Populated, Enabled
	Upgrade: Other
	L1 Cache Handle: Not Provided
	L2 Cache Handle: Not Provided
	L3 Cache Handle: Not Provided

 Since it is report a Qemu cpu and Manufacturer Bochs I am suspecting that it is qemu fully emulated vs KVM para-virtualized.
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