[Qemu-stable] internal error: Unknown CPU model host

[Jason Gauthier]

Greetings,

  First thing first, I am new to this.  I acquired some older hardware
and want to run a VM platform on it.  The hardware does support
virtualization natively.

I'm using debian stretch, and all all the prerequisites required for a
successful guest installation.  I decided to try Windows 10 for my
very first one.

I created my first guest via command line with virsh as so:
virt-install --virt-type kvm  --name Windows10 \
--memory 8192 --vcpus 2 --os-variant win10  --autostart \
--cdrom 
/VMs/isos/Windows/SW_DVD9_Win_Pro_10_1709.1_64BIT_English_Pro_Ent_EDU_N_MLF_X21-67518.ISO
\
--disk path=/VMs/Windows10/C.qcow2,bus=virtio,cache=writeback \
--disk path=/VMs/isos/Windows/virtio-win.iso,device=cdrom \
--network bridge=br1,model=virtio \
--graphics vnc,password=xxxxxx,port=5900

Once The install started, it just stuck at the "Blue Windows 10"
window/logo thing indefinitely.
The cpu was set to 'Conroe' and through some searching, I made the
following edits.

  <model fallback='allow'>core2duo</model>
  <feature policy='require' name='nx'/>

This allowed the OS to install.  Now, I am trying to either revert
these changes, or use a "better" CPU.  So, I went back to Conroe, and
Windows just sits at the same Blue Logo.

So, I checked out my other CPU options:
qemu-system-x86_64 -cpu \?

x86              486
x86  Broadwell-noTSX  Intel Core Processor (Broadwell, no TSX)
x86        Broadwell  Intel Core Processor (Broadwell)
x86           Conroe  Intel Celeron_4x0 (Conroe/Merom Class Core 2)
x86    Haswell-noTSX  Intel Core Processor (Haswell, no TSX)
x86          Haswell  Intel Core Processor (Haswell)
x86        IvyBridge  Intel Xeon E3-12xx v2 (Ivy Bridge)
x86          Nehalem  Intel Core i7 9xx (Nehalem Class Core i7)
x86       Opteron_G1  AMD Opteron 240 (Gen 1 Class Opteron)
x86       Opteron_G2  AMD Opteron 22xx (Gen 2 Class Opteron)
x86       Opteron_G3  AMD Opteron 23xx (Gen 3 Class Opteron)
x86       Opteron_G4  AMD Opteron 62xx class CPU
x86       Opteron_G5  AMD Opteron 63xx class CPU
x86           Penryn  Intel Core 2 Duo P9xxx (Penryn Class Core 2)
x86      SandyBridge  Intel Xeon E312xx (Sandy Bridge)
x86   Skylake-Client  Intel Core Processor (Skylake)
x86         Westmere  Westmere E56xx/L56xx/X56xx (Nehalem-C)
x86           athlon  QEMU Virtual CPU version 2.5+
x86         core2duo  Intel(R) Core(TM)2 Duo CPU     T7700  @ 2.40GHz
x86          coreduo  Genuine Intel(R) CPU           T2600  @ 2.16GHz
x86            kvm32  Common 32-bit KVM processor
x86            kvm64  Common KVM processor
x86             n270  Intel(R) Atom(TM) CPU N270   @ 1.60GHz
x86          pentium
x86         pentium2
x86         pentium3
x86           phenom  AMD Phenom(tm) 9550 Quad-Core Processor
x86           qemu32  QEMU Virtual CPU version 2.5+
x86           qemu64  QEMU Virtual CPU version 2.5+
x86             host  KVM processor with all supported host features (only avail
able in KVM mode)

Well, I thought "host" looked pretty good. (And it is in KVM mode)

But when I set it to "host":
error: internal error: Unknown CPU model host

So, I'm trying to determine my best path here.  I would appreciate any
suggestions.

Thanks!

Jason