From: George Dunlap Date: Wed, 22 Nov 2017 19:19:01 +0000 (+0000) Subject: SUPPORT.md: Add scalability features X-Git-Tag: archive/raspbian/4.11.1-1+rpi1~1^2~66^2~1016 X-Git-Url: https://dgit.raspbian.org/?a=commitdiff_plain;h=bf87b7f7d91a25404216e0a0f3e628ce9bf1f82e;p=xen.git SUPPORT.md: Add scalability features Superpage support and PVHVM. Signed-off-by: George Dunlap Acked-by: Jan Beulich Acked-by: Julien Grall --- diff --git a/SUPPORT.md b/SUPPORT.md index 5945ab4926..1e925ec539 100644 --- a/SUPPORT.md +++ b/SUPPORT.md @@ -158,6 +158,35 @@ on embedded platforms. Enables NUMA aware scheduling in Xen +## Scalability + +### Super page support + + Status, x86 HVM/PVH, HAP: Supported + Status, x86 HVM/PVH, Shadow, 2MiB: Supported + Status, ARM: Supported + +NB that this refers to the ability of guests +to have higher-level page table entries point directly to memory, +improving TLB performance. +On ARM, and on x86 in HAP mode, +the guest has whatever support is enabled by the hardware. +On x86 in shadow mode, only 2MiB (L2) superpages are available; +furthermore, they do not have the performance characteristics +of hardware superpages. + +Also note is feature independent +of the ARM "page granularity" feature (see below). + +### x86/PVHVM + + Status: Supported + +This is a useful label for a set of hypervisor features +which add paravirtualized functionality to HVM guests +for improved performance and scalability. +This includes exposing event channels to HVM guests. + # Format and definitions This file contains prose, and machine-readable fragments.