On 02/18/13 18:28, Laszlo Ersek wrote: > On 02/18/13 17:48, David Woodhouse wrote: >> On Mon, 2013-02-18 at 16:38 +0100, Paolo Bonzini wrote: >>> Indeed the difference between CPUs is puzzling. >> >> Very much so. So far I have established that it works OK here: >> >> cpu family : 6 >> model : 44 >> model name : Intel(R) Core(TM) i7 CPU X 980 @ 3.33GHz >> stepping : 2 >> microcode : 0x5 >> 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 >> pdpe1gb rdtscp lm constant_tsc arch_perfmon pebs bts rep_good nopl >> xtopology nonstop_tsc aperfmperf pni pclmulqdq dtes64 monitor ds_cpl vmx >> est tm2 ssse3 cx16 xtpr pdcm pcid sse4_1 sse4_2 popcnt aes lahf_lm arat >> dtherm tpr_shadow vnmi flexpriority ept vpid > >> ... but not here: >> >> cpu family : 6 >> model : 30 >> model name : Intel(R) Core(TM) i7 CPU 870 @ 2.93GHz >> stepping : 5 >> microcode : 0x5 >> 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 pni dtes64 monitor ds_cpl vmx smx est tm2 ssse3 >> cx16 xtpr pdcm sse4_1 sse4_2 popcnt lahf_lm ida dtherm tpr_shadow vnmi >> flexpriority ept vpid > > Maybe related to <https://patchwork.kernel.org/patch/26836/>?
http://git.kernel.org/?p=linux/kernel/git/torvalds/linux.git;a=commitdiff;h=3a624e2 http://git.kernel.org/?p=linux/kernel/git/torvalds/linux.git;a=commitdiff;h=046d871 Can you please compare the values of /sys/module/kvm_intel/parameters/unrestricted_guest between the working & non-working hosts? On my workstation, it says "N". Assuming it says "Y" on your "working" machines, what happens if you flip it to "N" (or load the kvm_intel module with the "unrestricted_guest=N" modparam)? Thanks! Laszlo
