I think this is a problem very much tied to the raw host cpu type and
the masking of that as core2duo for the guest. I just tried with a
current Trusty host with a current Vivid guest masked to core2duo:
host cpu:
processor : 7
vendor_id : GenuineIntel
cpu family : 6
model : 58
model name : Intel(R) Core(TM) i7-3770K CPU @ 3.50GHz
stepping : 9
microcode : 0x19
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov
pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx rdtscp lm
constant_tsc arch_perfmon pebs bts rep_good nopl xtopology nonstop_tsc
aperfmperf eagerfpu pni pclmulqdq dtes64 monitor ds_cpl vmx est tm2 ssse3 cx16
xtpr pdcm pcid sse4_1 sse4_2 popcnt tsc_deadline_timer aes xsave avx f16c
rdrand lahf_lm ida arat epb xsaveopt pln pts dtherm tpr_shadow vnmi
flexpriority ept vpid fsgsbase smep erms
libvirt setting:
<cpu mode='custom' match='exact'>
<model fallback='allow'>core2duo</model>
<vendor>Intel</vendor>
</cpu>
guest cpu:
processor : 0
vendor_id : GenuineIntel
cpu family : 6
model : 15
model name : Intel(R) Core(TM)2 Duo CPU T7700 @ 2.40GHz
stepping : 11
microcode : 0x1
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov
pat pse36 clflush mmx fxsr sse sse2 ss syscall nx lm constant_tsc rep_good nopl
pni vmx ssse3 cx16 x2apic hypervisor lahf_lm vnmi ept
There is some difference of what the guest sees on Scott's host compared to
mine:
--- cpuflags-smb 2015-03-17 10:38:33.477207501 +0100
+++ cpuflags-smoser 2015-03-17 10:38:59.741208228 +0100
@@ -23,6 +23,7 @@
ss
syscall
nx
+rdtscp
lm
constant_tsc
rep_good
@@ -31,8 +32,8 @@
vmx
ssse3
cx16
-x2apic
+sse4_1
+sse4_2
+popcnt
hypervisor
lahf_lm
-vnmi
-ept
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https://bugs.launchpad.net/bugs/1431473
Title:
kvm_intel (nested) module will not load [Input/output error]
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