Re: [Xen-devel] [PATCH] automation: document vsyscall=emulate for old glibc

["Durrant, Paul" <pdurrant@xxxxxxxxxxxx>]

> -----Original Message-----
> From: Xen-devel <xen-devel-bounces@xxxxxxxxxxxxxxxxxxxx> On Behalf Of Wei
> Liu
> Sent: 25 February 2020 12:11
> To: Xen Development List <xen-devel@xxxxxxxxxxxxxxxxxxxx>
> Cc: Doug Goldstein <cardoe@xxxxxxxxxx>; Wei Liu <wl@xxxxxxx>
> Subject: [Xen-devel] [PATCH] automation: document vsyscall=emulate for old
> glibc
> 
> Signed-off-by: Wei Liu <wl@xxxxxxx>
> ---
>  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.
> +

I can vouch that it is indeed necessary.

Reviewed-by: Paul Durrant <pdurrant@xxxxxxxxxx>

> 
>  Building a container
>  --------------------
> --
> 2.20.1
> 
> 
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