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KVM clients on my AMD Windsor CPU system no longer boot. Over on the ARCHLinux forum, they were talking about this commit acing out older CPUs: commit 2c82878b0cb38fd516fd612c67852a6bbf282003 Author: Paolo Bonzini pbonzini@redhat.com Date: Mon Mar 27 14:37:28 2017 +0200 KVM: VMX: require virtual NMI support

Virtual NMIs are only missing in Prescott and Yonah chips.  Both are obsolete
for virtualization usage---Yonah is 32-bit only even---so drop vNMI emulation.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

My CPUinfo is: processor : 1 vendor_id : AuthenticAMD cpu family : 15 model : 67 model name : AMD Athlon(tm) 64 X2 Dual Core Processor 6000+ stepping : 3 cpu MHz : 1000.000 cache size : 1024 KB physical id : 0 siblings : 2 core id : 1 cpu cores : 2 apicid : 1 initial apicid : 1 fpu : yes fpu_exception : yes cpuid level : 1 wp : yes flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 ht syscall nx mmxext fxsr_opt rdtscp lm 3dnowext 3dnow rep_good nopl cpuid extd_apicid pni cx16 lahf_lm cmp_legacy svm extapic cr8_legacy 3dnowprefetch vmmcall bugs : fxsave_leak sysret_ss_attrs null_seg swapgs_fence amd_e400 bogomips : 2009.12 TLB size : 1024 4K pages clflush size : 64 cache_alignment : 64 address sizes : 40 bits physical, 48 bits virtual power management: ts fid vid ttp tm stc