[xen master] SUPPORT.md: Add secondary memory management features

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[xen master] SUPPORT.md: Add secondary memory management features

commit 9d9ebd792ee3c07affa0e7b2b3ad57e37893c490
Author:     George Dunlap <[hidden email]>
AuthorDate: Wed Nov 22 19:19:04 2017 +0000
Commit:     George Dunlap <[hidden email]>
CommitDate: Mon Nov 27 16:48:44 2017 +0000

    SUPPORT.md: Add secondary memory management features
    Signed-off-by: George Dunlap <[hidden email]>
    Acked-by: Jan Beulich <[hidden email]>
 SUPPORT.md | 37 +++++++++++++++++++++++++++++++++++++
 1 file changed, 37 insertions(+)

diff --git a/SUPPORT.md b/SUPPORT.md
index d748fff..93629f6 100644
--- a/SUPPORT.md
+++ b/SUPPORT.md
@@ -204,6 +204,43 @@ Export hypervisor coverage data suitable for analysis by gcov or lcov.
 Allows a guest to add or remove memory after boot-time.
 This is typically done by a guest kernel agent known as a "balloon driver".
+### Populate-on-demand memory
+    Status, x86 HVM: Supported
+This is a mechanism that allows normal operating systems with only a balloon driver
+to boot with memory < maxmem.
+### Memory Sharing
+    Status, x86 HVM: Expermental
+Allow sharing of identical pages between guests
+### Memory Paging
+    Status, x86 HVM: Experimenal
+Allow pages belonging to guests to be paged to disk
+### Transcendent Memory
+    Status: Experimental
+Transcendent Memory (tmem) allows the creation of hypervisor memory pools
+which guests can use to store memory
+rather than caching in its own memory or swapping to disk.
+Having these in the hypervisor
+can allow more efficient aggregate use of memory across VMs.
+### Alternative p2m
+    Status, x86 HVM: Tech Preview
+    Status, ARM: Tech Preview
+Allows external monitoring of hypervisor memory
+by maintaining multiple physical to machine (p2m) memory mappings.
 ## Resource Management
 ### CPU Pools
generated by git-patchbot for /home/xen/git/xen.git#master

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