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Re: [PATCH v3 5/5] pc-bios: s390x: Go into disabled wait when encounteri
From: |
Thomas Huth |
Subject: |
Re: [PATCH v3 5/5] pc-bios: s390x: Go into disabled wait when encountering a PGM exception |
Date: |
Tue, 1 Sep 2020 19:24:32 +0200 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.6.0 |
On 31/08/2020 17.09, Janosch Frank wrote:
> Let's setup a PGM PSW, so we won't load 0s when a program exception
> happens. Instead we'll load a disabled wait PSW.
>
> Signed-off-by: Janosch Frank <frankja@linux.ibm.com>
> Reviewed-by: Christian Borntraeger <borntraeger@de.ibm.com>
> ---
> pc-bios/s390-ccw/start.S | 3 +++
> 1 file changed, 3 insertions(+)
>
> diff --git a/pc-bios/s390-ccw/start.S b/pc-bios/s390-ccw/start.S
> index 939aac3a7c..775b45baeb 100644
> --- a/pc-bios/s390-ccw/start.S
> +++ b/pc-bios/s390-ccw/start.S
> @@ -44,6 +44,9 @@ done:
> larl %r2, external_new_psw
> stg %r1, 8(%r2)
> mvc 0x1b0(16),0(%r2)
> + /* set up a pgm exception disabled wait psw */
> + larl %r2, disabled_wait_psw
> + mvc 0x01d0(16), 0(%r2)
> j main /* And call C */
>
> memsetxc:
>
Sounds like a good idea.
Reviewed-by: Thomas Huth <thuth@redhat.com>
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