[libvirt] [RFC 0/5] Qemu: s390: Cpu Model Support

[Christian Borntraeger]

On 11/03/2016 02:37 PM, Jiri Denemark wrote:
> On Wed, Nov 02, 2016 at 16:34:30 -0400, Jason J. Herne wrote:
> ...
>> Patch #5 updates qemuBuildCpuModelArgStr's VIR_CPU_MODE_HOST_MODEL case. It
>> seems like all archs except PPC64 do not support host model mode.
> 
> x86 supports host-model too, but ppc64 (mis)used the host-model mode in
> a very specific way.
> 
>> Here is a list of outstanding things to do and some questions.
>>
>> 1. virsh domcapabilities --emulatorbin flag
>>
>> This works today if the command is passed --emulatorbin /usr/bin/qemu-kvm.
>> If no emulatorbin is given then Libvirt seems to choose
>> /usr/bin/qemu-system-s390x my system which does not have kvm enabled.
> 
> Does s390x still use the abandoned qemu-kvm name or is it just the
> stupid shell wrapper which calls the real binary with -machine
> accel=kvm? You say /usr/bin/qemu-system-s390x does not have kvm enabled,
> does it mean you cannot use kvm with this binary at all or you need to
> explicitly enable it with the -machine accel=kvm option?

Its the latter. qemu-system-s390x has tcg and kvm and requires accel=kvm to return
useful data