Getting VIA Padlock hardware encryption to work inside kvm guest

Getting VIA Padlock hardware encryption to work inside kvm guest

[Manuel Andreu]

[-- Attachment #1: Type: text/plain, Size: 1126 bytes --]

Hi everyone,

i am trying to set up a virtualized server on Zotac Z-Box with VIAs Nano 
X2 processor.

I have set up a host system based upon the current debian wheezy testing 
with kernel 3.2.0-4-amd64 and qemu 1.1.2+dfsg-2 and have succeeded to 
create virtual guests for debian and windows.

Now i am trying to get the VIA Padlick hardware encryption working 
inside the guests.

As the page http://www.linux-kvm.org/page/Tuning_KVM suggest, i tried to 
enable the host cpu feature for the guests with "qemu -cpu host", but i 
get "Unable to find x86 CPU definition". With "qemu -cpu ?" i get a list 
of supported cpus, but host is not part of it. When i try "qemu -cpu 
qemu64,+ace,+ace_en" i get "CPU feature ace not found" and "CPU feature 
ace_en not found".

As the page https://patchwork.kernel.org/patch/702631/ suggests, support 
for the VIA Padlock CPUID and flags should already be there.

I do not understand why qemu has no definition for the "host" cpu, can 
anybody please help me with this problem or at least point me somewhere 
for more information?

Sincerely,
Manuel Andreu


[-- Attachment #2: S/MIME Kryptografische Unterschrift --]
[-- Type: application/pkcs7-signature, Size: 4450 bytes --]

Re: Getting VIA Padlock hardware encryption to work inside kvm guest

[Stefan Ahrens]

Hi Manuel,

i just switched from qemu-kvm 1.2.0 to qemu 1.3.0
and got the same issue.
You just have to set the parameter -enable-kvm to set -cpu host.

greets
Stefan Ahrens