![]() Static inline unsigned int cpuid_ecx(unsigned int op) This is how the function cpuid_ecx looks like Then it calls another function test_bit to check for the 5th bit in ecx. It calls a function cpuid_ecx() and assigns the output to a variable ecx. The above KVM code checks for VMX in the CPU. Return test_bit(5, &ecx) /* CPUID.1:ECX.VMX -> VT */ I am not sure for AMD because I started writing this article more than a year ago and left it to dust.īefore software attempt to use these features, it must check for their presence. A value of 1 indicates that the processor supports this technology. On Intel CPUs, the 5th bit of ECX registers denotes the CPU support for VMX. If a CPU supports these features, certain register in the CPU are set. This is not to be confused with the VMware terminology which stands for Virtual Machine Executable, a component of an ESX virtual machine that takes care of I/O, user interfaces, snapshot managers, and remote console.īoth VMX and SVM are CPU features but how does the CPU advertises these features? How does the OS query the presence of such features? (Intel) Processor support for virtualization is provided by a form of processor operation called VMX operation. VMX stands for Virtual Machine Extensions. SVM is the set of CPU instructions that provides the virtualization instruction. When AMD published their virtualization extension it was called SVM but later marketed as AMD-V. What do they stand for? What do they mean? Both denotes the virtualization extensions in their respective CPU’s.įine. My CPU is AMD, hence svm flag is present. ![]() To highlight the search pattern vmx and svm in a different color. I personally prefer grep -color -E ‘vmx|svm’ /proc/cpuinfo Wdt arat cpb hw_pstate npt lbrv svm_lock nrip_save pausefilter Svm extapic cr8_legacy abm sse4a misalignsse 3dnowprefetch ibs skinit Grep -E ‘vmx|svm’ /proc/cpuinfo to check for HW virtualization supportįlags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mcaĬmov pat pse36 clflush mmx fxsr sse sse2 ht syscall nx mmxextįxsr_opt pdpe1gb rdtscp lm constant_tsc rep_good nopl nonstop_tscĮxtd_apicid aperfmperf pni monitor ssse3 cx16 popcnt lahf_lm cmp_legacy If an svm flag appears then you have AMD support.Before installing a hypervisor or a 64bit Guest OS in a virtualized environment, many HOW-TOs and tutorials will ask us to run this command to check for hardware virtualization support in the CPU. To check if you have the CPU flags for AMD support, enter the following:įlags : 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 a vmx flag appears then you have Intel support. To check if you have the CPU flags for Intel support, enter the following:įlags : 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 ![]() 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. Microsoft Windows as an unmodified guest operating system with Intel Vanderpool or AMD's Pacifica technology. Linux and UNIX operating systems, including NetBSD, FreeBSD, and Solaris. Intel VT-x or AMD-V Pacifica and Vanderpool technology for full and paravirtualization.
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