Editing X86 virtualization (section)

==== {{Anchor|AMD-V}}AMD virtualization (AMD-V) ====
[[File:AMD Phenom die equalized.png|thumb|[[AMD Phenom]] die]]

AMD developed its first generation virtualization extensions under the code name "Pacifica", and initially published them as AMD Secure Virtual Machine (SVM),<ref>{{cite web |url=http://www.mimuw.edu.pl/~vincent/lecture6/sources/amd-pacifica-specification.pdf |title=33047_SecureVirtualMachineManual_3-0.book |access-date=2010-05-02 |url-status=live |archive-url=https://web.archive.org/web/20120305061511/http://www.mimuw.edu.pl/~vincent/lecture6/sources/amd-pacifica-specification.pdf |archive-date=2012-03-05}}</ref> but later marketed them under the trademark ''AMD Virtualization'', abbreviated ''AMD-V''.

On May 23, 2006, AMD released the Athlon 64 ([[List of AMD Athlon 64 microprocessors#"Orleans" (F2 & F3, 90 nm)|"Orleans"]]), the Athlon 64 X2 ([[List of AMD Athlon 64 microprocessors#"Windsor" (F2 & F3, 90 nm)|"Windsor"]]) and the Athlon 64 FX ([[List of AMD Athlon 64 microprocessors#"Windsor" (F2, 90 nm)|"Windsor"]]) as the first AMD processors to support this technology.

AMD-V capability also features on the [[Athlon 64]] and [[Athlon 64 X2]] family of processors with revisions "F" or "G" on [[socket AM2]], [[AMD Turion#Turion 64 X2|Turion 64 X2]], and [[Opteron]] 2nd generation<ref>{{cite web |url=http://www.amd.com/us-en/Processors/ProductInformation/0,,30_118_8796_8806~111165,00.html#111166 |title=What are the main differences between Second-Generation AMD Opteron processors and first-generation AMD Opteron processors? |website=amd.com |access-date=2012-02-04 |url-status=dead |archive-url=https://web.archive.org/web/20090415210555/http://www.amd.com/us-en/Processors/ProductInformation/0%2C%2C30_118_8796_8806~111165%2C00.html#111166 |archive-date=April 15, 2009}}</ref> and third-generation,<ref>{{cite web |url=http://www.amd.com/us-en/Processors/ProductInformation/0,,30_118_8796_8806~119722,00.html#119726 |title=What virtualization enhancements do Quad-Core AMD Opteron processors feature? |website=amd.com |access-date=2012-02-04 |url-status=dead |archive-url=https://web.archive.org/web/20090416073603/http://www.amd.com/us-en/Processors/ProductInformation/0%2C%2C30_118_8796_8806~119722%2C00.html#119726 |archive-date=April 16, 2009}}</ref> [[AMD Phenom|Phenom]] and [[Phenom II]] processors. The [[AMD Accelerated Processing Unit|APU Fusion]] processors support AMD-V. AMD-V is not supported by any Socket 939 processors. The only [[Sempron]] processors which support it are APUs and [[List of AMD Sempron microprocessors#"Huron" (65&nbsp;nm, Low power)|Huron]], [[List of AMD Sempron microprocessors#"Regor" (Socket AM3, Dual-core, C3, 45 nm)|Regor]], [[List of AMD Sempron microprocessors#"Sargas" (Socket AM3, Single-core, C2 & C3, 45&nbsp;nm)|Sargas]] desktop CPUs.

AMD Opteron CPUs beginning with the Family 0x10 Barcelona line, and Phenom II CPUs, support a second generation hardware virtualization technology called [[Rapid Virtualization Indexing]] (formerly known as Nested Page Tables during its development), later adopted by Intel as [[Extended Page Table]]s (EPT).

As of 2019, all [[Zen (microarchitecture)|Zen]]-based AMD processors support AMD-V.

The [[CPU flag (x86)|CPU flag]] for AMD-V is "svm". This may be checked in [[Comparison of BSD operating systems|BSD derivatives]] via [[dmesg]] or [[sysctl]] and in [[Linux]] via <code>/proc/[[cpuinfo]]</code>.<ref name=cpuflag/> Instructions in AMD-V include VMRUN, VMLOAD, VMSAVE, CLGI, VMMCALL, INVLPGA, SKINIT, and STGI.

With some [[motherboard]]s, users must enable AMD SVM feature in the [[BIOS]] setup before applications can make use of it.<ref>{{Cite web |title=How to enable Intel VTx and AMD SVM? |website=Support |publisher=QNAP Systems, Inc. |url=https://www.qnap.com/en/how-to/faq/article/how-to-enable-intel-vtx-and-amd-svm|access-date=2020-12-23|archive-url=https://web.archive.org/web/20180307204640/https://www.qnap.com/en/how-to/faq/article/how-to-enable-intel-vtx-and-amd-svm |archive-date=2018-03-07 |url-status=dead}}</ref>