From: Cornelia Huck <cohuck@redhat.com>
To: Pierre Morel <pmorel@linux.ibm.com>
Cc: Janosch Frank <frankja@linux.ibm.com>,
kvm@vger.kernel.org, linux-s390@vger.kernel.org,
david@redhat.com, thuth@redhat.com
Subject: Re: [kvm-unit-tests PATCH v6 07/10] s390x: css: msch, enable test
Date: Thu, 14 May 2020 14:08:08 +0200 [thread overview]
Message-ID: <20200514140808.269f6485.cohuck@redhat.com> (raw)
In-Reply-To: <abafd691-d9ab-33b2-c522-d37fecc3e881@linux.ibm.com>
On Tue, 28 Apr 2020 10:27:36 +0200
Pierre Morel <pmorel@linux.ibm.com> wrote:
> On 2020-04-27 15:11, Janosch Frank wrote:
> > On 4/24/20 12:45 PM, Pierre Morel wrote:
> >> This is NOT a routine to really enable the channel, no retry is done,
> >> in case of error, a report is made.
> >
> > Would we expect needing retries for the pong device?
>
> Yes it can be that we need to retry some instructions if we want them to
> succeed.
> This is the case for example if we develop a driver for an operating system.
> When working with firmware, sometime, things do not work at the first
> time. Mostly due to races in silicium, firmware or hypervisor or between
> them all.
>
> Since our purpose is to detect such problems we do not retry
> instructions but report the error.
>
> If we detect such problem we may in the future enhance the tests.
I think I've seen retries needed on z/VM in the past; do you know if
that still happens?
next prev parent reply other threads:[~2020-05-14 12:08 UTC|newest]
Thread overview: 41+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-04-24 10:45 [kvm-unit-tests PATCH v6 00/10] s390x: Testing the Channel Subsystem I/O Pierre Morel
2020-04-24 10:45 ` [kvm-unit-tests PATCH v6 01/10] s390x: saving regs for interrupts Pierre Morel
2020-04-27 8:59 ` David Hildenbrand
2020-04-27 10:50 ` Pierre Morel
2020-04-24 10:45 ` [kvm-unit-tests PATCH v6 02/10] s390x: Use PSW bits definitions in cstart Pierre Morel
2020-04-27 9:01 ` David Hildenbrand
2020-04-28 8:10 ` Pierre Morel
2020-04-24 10:45 ` [kvm-unit-tests PATCH v6 03/10] s390x: Move control register bit definitions and add AFP to them Pierre Morel
2020-04-24 10:45 ` [kvm-unit-tests PATCH v6 04/10] s390x: interrupt registration Pierre Morel
2020-05-14 11:58 ` Cornelia Huck
2020-05-15 6:57 ` Pierre Morel
2020-05-15 7:57 ` David Hildenbrand
2020-04-24 10:45 ` [kvm-unit-tests PATCH v6 05/10] s390x: Library resources for CSS tests Pierre Morel
2020-05-14 12:03 ` Cornelia Huck
2020-05-15 7:02 ` Pierre Morel
2020-05-15 7:11 ` Cornelia Huck
2020-05-15 7:14 ` Pierre Morel
2020-04-24 10:45 ` [kvm-unit-tests PATCH v6 06/10] s390x: css: stsch, enumeration test Pierre Morel
2020-04-27 13:06 ` Janosch Frank
2020-04-28 8:17 ` Pierre Morel
2020-05-14 12:05 ` Cornelia Huck
2020-05-15 7:05 ` Pierre Morel
2020-04-24 10:45 ` [kvm-unit-tests PATCH v6 07/10] s390x: css: msch, enable test Pierre Morel
2020-04-27 13:11 ` Janosch Frank
2020-04-28 8:27 ` Pierre Morel
2020-05-14 12:08 ` Cornelia Huck [this message]
2020-05-15 7:11 ` Pierre Morel
2020-05-15 8:25 ` Cornelia Huck
2020-05-15 8:53 ` Janosch Frank
2020-05-15 11:34 ` Pierre Morel
2020-04-24 10:45 ` [kvm-unit-tests PATCH v6 08/10] s390x: define wfi: wait for interrupt Pierre Morel
2020-04-27 12:59 ` Janosch Frank
2020-04-28 8:44 ` Pierre Morel
2020-04-28 9:20 ` Janosch Frank
2020-04-28 9:27 ` Pierre Morel
2020-04-24 10:45 ` [kvm-unit-tests PATCH v6 09/10] s390x: css: ssch/tsch with sense and interrupt Pierre Morel
2020-05-14 12:24 ` Cornelia Huck
2020-05-15 7:37 ` Pierre Morel
2020-04-24 10:45 ` [kvm-unit-tests PATCH v6 10/10] s390x: css: ping pong Pierre Morel
2020-04-27 13:14 ` Janosch Frank
2020-04-28 8:50 ` Pierre Morel
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