[Xen-changelog] [xen staging] automation: document vsyscall=emulate for old glibc

[patchbot@xxxxxxx]

commit 3e295eee884f57cd2e257ba70322d81fe39975de
Author:     Wei Liu <wl@xxxxxxx>
AuthorDate: Tue Feb 25 12:10:48 2020 +0000
Commit:     Wei Liu <wl@xxxxxxx>
CommitDate: Wed Mar 4 10:14:16 2020 +0000

    automation: document vsyscall=emulate for old glibc
    
    Signed-off-by: Wei Liu <wl@xxxxxxx>
    Reviewed-by: Paul Durrant <pdurrant@xxxxxxxxxx>
    Acked-by: Doug Goldstein <cardoe@xxxxxxxxxx>
---
 automation/build/README.md | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/automation/build/README.md b/automation/build/README.md
index 476f82cf45..8cda2b65a5 100644
--- a/automation/build/README.md
+++ b/automation/build/README.md
@@ -58,6 +58,16 @@ understands.
 - XEN_CONFIG_EXPERT: If this is defined in your shell it will be
   automatically passed through to the container.
 
+If your docker host has Linux kernel > 4.11, and you want to use containers
+that run old glibc (for example, CentOS 6 or SLES11SP4), you may need to add
+
+```
+vsyscall=emulate
+```
+
+to the host kernel command line. That enables a legacy interface that is used
+by old glibc.
+
 
 Building a container
 --------------------
--
generated by git-patchbot for /home/xen/git/xen.git#staging

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