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

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On Thu, Nov 03, 2016 at 14:39:39 +0100, Christian Borntraeger wrote:
> 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

Good, so it's the same as with x86. This issue should be fixed by "qemu:
Add support for unavailable-features" series.

Jirka

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