[xen master] SUPPORT.md: Add scalability features

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[xen master] SUPPORT.md: Add scalability features

patchbot
commit bf87b7f7d91a25404216e0a0f3e628ce9bf1f82e
Author:     George Dunlap <[hidden email]>
AuthorDate: Wed Nov 22 19:19:01 2017 +0000
Commit:     George Dunlap <[hidden email]>
CommitDate: Thu Nov 23 17:36:33 2017 +0000

    SUPPORT.md: Add scalability features
   
    Superpage support and PVHVM.
   
    Signed-off-by: George Dunlap <[hidden email]>
    Acked-by: Jan Beulich <[hidden email]>
    Acked-by: Julien Grall <[hidden email]>
---
 SUPPORT.md | 29 +++++++++++++++++++++++++++++
 1 file changed, 29 insertions(+)

diff --git a/SUPPORT.md b/SUPPORT.md
index 5945ab4..1e925ec 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.
--
generated by git-patchbot for /home/xen/git/xen.git#master

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