Saturday, April 17, 2010

Virtualization: OS support

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OS support

To run full virtualization guests on systems with Hardware-assisted Virtual Machine (HVM), Intel, or AMD platforms, you must check to ensure your CPUs have the capabilities needed to do so.

To check if you have the CPU flags for Intel support, enter the following:


grep vmx /proc/cpuinfo

The output displays:


flags : fpu tsc msr pae mce cx8 apic mtrr mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm syscall nx lm constant_tsc pni monitor ds_cpl vmx est tm2 cx16 xtpr lahf_lm

If a vmx flag appears then you have Intel support.


To check if you have the CPU flags for AMD support, enter the following:


grep svm /proc/cpuinfo

cat /proc/cpuinfo | grep svm

The output displays:


flags : fpu tsc msr pae mce cx8 apic mtrr mca cmov pat pse36 clflush dt acpi mmx fxsr sse sse2 ss ht tm syscall nx mmtext fxsr_opt rdtscp lm 3dnowext pni cx16 lahf_lm cmp_legacy svm cr8_legacy


If an svm flag appears then you have AMD support.


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