From bf87b7f7d91a25404216e0a0f3e628ce9bf1f82e Mon Sep 17 00:00:00 2001 From: George Dunlap Date: Wed, 22 Nov 2017 19:19:01 +0000 Subject: [PATCH] SUPPORT.md: Add scalability features Superpage support and PVHVM. Signed-off-by: George Dunlap Acked-by: Jan Beulich Acked-by: Julien Grall --- SUPPORT.md | 29 +++++++++++++++++++++++++++++ 1 file changed, 29 insertions(+) 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. -- 2.30.2