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https://serverfault.com/questions/222010/difference-between-xen-pv-xen-kvm-and-hvm
See XenParavirtOps wiki page for more information about Linux pvops Xen support. Xen Full virtualization (HVM) Fully virtualized aka HVM (Hardware Virtual Machine) guests require CPU virtualization extensions from the host CPU (Intel VT, AMD-V).
https://wiki.xen.org/wiki/Xen_Project_Software_Overview
Components in detail: The Xen Project Hypervisor is an exceptionally lean (<65KSLOC on Arm and <300KSLOC on x86) software layer that runs directly on the hardware and is responsible for managing CPU, memory, and interrupts. It is the first program running after the bootloader exits. The hypervisor itself has no knowledge of I/O functions such as networking and storage.
https://wiki.xenproject.org/wiki/Xen_Project_FAQ_Compatibility
As of Xen 4.3 Xen requires at least x86 64-bit for the hypervisor. Xen used to be supported on IA64 (Itanium) but that support was dropped as of Xen 4.2 and Linux v3.14. On x86 Xen Project requires a "P6" or newer processor (that's any Intel or AMD x86 CPU purchased in the last seven years).
https://xenbits.xen.org/docs/unstable/support-matrix.html
This table summarises the support status of Xen releases, and of individual features within each release. Important notes The matrix is extracted automatically from the formal support status documents in each Xen release. The full formal support status document is …
https://en.wikipedia.org/wiki/Xen
CPUs that support virtualization make it possible to run unmodified guests, including proprietary operating systems (such as Microsoft Windows). This is known as hardware-assisted virtualization, however in Xen this is known as hardware virtual machine (HVM).License: GNU GPL version 2
https://wiki.xenproject.org/wiki/Tuning_Xen_for_Performance
See this page for a more detailed example PV on HVM config file. vCPU Pinning for guests. You can dedicate a physical cpu to a particular virtual cpu or a set of virtual cpus. If you have enough physical cpus for all your guests, including dom0, you can make sure that the scheduler won't get in your way.
https://discussions.citrix.com/topic/381981-archlinux-hvm-domu-slow-disk-access-100-cpu-xenserver-7/
Oct 24, 2016 · CONFIG_XEN_ACPI=y CONFIG_XEN_SYMS=y CONFIG_XEN_HAVE_VPMU=y The reason I recognized this performance problem is that when I went to start up my Xen HVM Archlinux instance, it would take forever to boot. Looking at xentop I saw that the CPU for that domU was at 99.9%. Every time I do a dd, the CPU in xentop for that domU jumps and stays at 99.9%.
https://discussions.citrix.com/topic/399294-xenserver-76-crash-panic-on-cpu-30-xen-bug-at-dbuildxen-476xenincludeasmhvmvmxvmxh334/
Nov 16, 2018 · hello,Tobias. Unfortunately，three of our xenserver nodes crash again today. our customers complain about it,so we need your help! Memory Mapped I/O above 4 GB is set enable in our bios as you metioned which allow installing drivers in higher memory space.
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