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+++ This bug was initially created as a clone of Bug #1445834 +++

Based on LKML email, the processor has all the features in Opteron_G5 plus the following features:

cpu family	: 23
model		: 1
model name	: AMD Ryzen 7 1800X Eight-Core Processor
flags           :
mmxext fxsr_opt rdtscp movbe rdrand extapic cr8_legacy 3dnowprefetch fsgsbase 
bmi1 avx2 smep bmi2 rdseed adx smap clflushopt sha_ni xsaveopt xsavec xgetbv1
xsaves clzero topoext

The "topoext" feature needs extra support in QEMU.

"bpext" and "mwaitx" may need KVM support too.

host-model is broken on Ryzen.

(In reply to Paolo Bonzini from comment #2)
> host-model is broken on Ryzen.

This is more serious than simply lacking the CPU model definition. Is there a BZ for that with more details?

They used quite old versions of libvirt and QEMU, which resulted in Opteron_G3 plus a bunch of features instead of the newest Opteron_G5 +/- features. And QEMU was so old it didn't automatically increase CPUID level based on the extra features.

The set of disabled feature in the guest compared to Opteron_G5 is okay.  Thanks!

Verify this bug with comment 8, comment 9 and comment 10.