[libvirt-users] CPU model and missing AES-NI extension

[Dennis Jacobfeuerborn]

Hi,
today I tried to configure a guest using Virt-Manager and used the "copy
host cpu configuration" option which resultet in a "Sandy Bridge" model.
What I noticed is that for example the "aes" extension is not available
in the guest even though it is available on the host cpu.

This is what the host cpu looks like:

model name	: Intel(R) Xeon(R) CPU E5-2650 v3 @ 2.30GHz
flags		: fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov
pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx
pdpe1gb rdtscp lm constant_tsc arch_perfmon pebs bts rep_good nopl
xtopology nonstop_tsc aperfmperf eagerfpu pni pclmulqdq dtes64 monitor
ds_cpl vmx smx est tm2 ssse3 fma cx16 xtpr pdcm pcid dca sse4_1 sse4_2
x2apic movbe popcnt tsc_deadline_timer aes xsave avx f16c rdrand lahf_lm
abm ida arat epb xsaveopt pln pts dtherm tpr_shadow vnmi flexpriority
ept vpid fsgsbase tsc_adjust bmi1 avx2 smep bmi2 erms invpcid

And this is what I get in the guest:

model name	: Intel Xeon E312xx (Sandy Bridge)
flags		: fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov
pat pse36 clflush mmx fxsr sse sse2 ss syscall nx pdpe1gb lm
constant_tsc pni ssse3 cx16 sse4_1 sse4_2 popcnt lahf_lm abm

Is there a way to get closer to the hardware and get as many of the host
features in the guest as possible? I never intend to do anything like
live-migration with this guest so compatibility for that case is not a
concern.

Regards,
  Dennis