From: Wei Liu <wl@xen.org>
Date: Tue, 25 Feb 2020 12:10:48 +0000 (+0000)
Subject: automation: document vsyscall=emulate for old glibc
X-Git-Tag: archive/raspbian/4.14.0+80-gd101b417b7-1+rpi1^2~63^2~584
X-Git-Url: https://dgit.raspbian.org/?a=commitdiff_plain;h=3e295eee884f57cd2e257ba70322d81fe39975de;p=xen.git

automation: document vsyscall=emulate for old glibc

Signed-off-by: Wei Liu <wl@xen.org>
Reviewed-by: Paul Durrant <pdurrant@amazon.com>
Acked-by: Doug Goldstein <cardoe@cardoe.com>
---

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
 --------------------