Other CPU features that are key to virtualization are the Load AH from Flags (LAHF) and the Save AH to Flags (SAHF) commands and virtualization extensions. According to IDC, Intel led the worldwide server microprocessor unit share in 20. NX and XD bits ensure that the CPU refuses to run code in protected areas. One feature that Intel and AMD both provide is memory space isolation through no-execute (NX) and execute disable (XD) bits respectively, which protects VMs from malware. The choice of hypervisor - and its support for specific processors - might affect the choice of processor for virtualization. One of the best approaches to choosing the right CPU for virtualization lies in identifying the specific features you want to implement in your virtual environment. For example, Intel VT implementations include VT-x, VT-i, VT-d and VT-c, and AMD offers AMD-V and AMD-Vi. Processor types, such as those offered by Intel and AMD, and their specific uses are differentiated by acronyms that represent the command and instruction sets developed to perform virtualization-centric processor tasks. It's easier to assign and reallocate those resources when they are virtualized.įollowing are some considerations for choosing and configuring a CPU for virtualization. The same underlying processor resources exist whether you use physical or virtual machines the hypervisor abstracts each physical CPU into one vCPU that can be easily assigned to workloads. You can assign one or more virtual CPUs (vCPUs) to a VM, depending on how compute-intensive the workload is. Think about what you want to achieve with your virtual infrastructure and the types of workloads you run when choosing a CPU for virtualization.
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