From: Nico Boehr <nrb@linux.ibm.com>
To: Eric Farman <farman@linux.ibm.com>,
Thomas Huth <thuth@redhat.com>,
Janosch Frank <frankja@linux.ibm.com>,
Claudio Imbrenda <imbrenda@linux.ibm.com>
Cc: David Hildenbrand <david@redhat.com>,
kvm@vger.kernel.org, linux-s390@vger.kernel.org
Subject: Re: [PATCH kvm-unit-tests v1 1/6] lib: s390x: smp: Retry SIGP SENSE on CC2
Date: Mon, 07 Mar 2022 12:50:10 +0100 [thread overview]
Message-ID: <77ac96f703c777b8b4a4c4785a3f35cac9eab9c4.camel@linux.ibm.com> (raw)
In-Reply-To: <20220303210425.1693486-2-farman@linux.ibm.com>
On Thu, 2022-03-03 at 22:04 +0100, Eric Farman wrote:
> The routine smp_cpu_stopped() issues a SIGP SENSE, and returns true
> if it received a CC1 (STATUS STORED) with the STOPPED or CHECK STOP
> bits enabled. Otherwise, it returns false.
>
> This is misleading, because a CC2 (BUSY) merely indicates that the
> order code could not be processed, not that the CPU is operating.
> It could be operating but in the process of being stopped.
>
> Convert the invocation of the SIGP SENSE to retry when a CC2 is
> received, so we get a more definitive answer.
>
> Signed-off-by: Eric Farman <farman@linux.ibm.com>
Reviewed-by: Nico Boehr <nrb@linux.ibm.com>
next prev parent reply other threads:[~2022-03-07 11:50 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-03-03 21:04 [PATCH kvm-unit-tests v1 0/6] s390x: SIGP fixes Eric Farman
2022-03-03 21:04 ` [PATCH kvm-unit-tests v1 1/6] lib: s390x: smp: Retry SIGP SENSE on CC2 Eric Farman
2022-03-07 11:50 ` Nico Boehr [this message]
2022-03-07 15:20 ` Claudio Imbrenda
2022-03-03 21:04 ` [PATCH kvm-unit-tests v1 2/6] s390x: smp: Test SIGP RESTART against stopped CPU Eric Farman
2022-03-04 10:43 ` Janosch Frank
2022-03-04 14:20 ` Eric Farman
2022-03-07 12:42 ` Nico Boehr
2022-03-07 15:22 ` Claudio Imbrenda
2022-03-03 21:04 ` [PATCH kvm-unit-tests v1 3/6] s390x: smp: Fix checks for SIGP STOP STORE STATUS Eric Farman
2022-03-04 10:40 ` Janosch Frank
2022-03-04 14:38 ` Eric Farman
2022-03-07 18:30 ` Eric Farman
2022-03-03 21:04 ` [PATCH kvm-unit-tests v1 4/6] s390x: smp: Create and use a non-waiting CPU stop Eric Farman
2022-03-07 13:31 ` Nico Boehr
2022-03-07 19:01 ` Eric Farman
2022-03-07 15:30 ` Claudio Imbrenda
2022-03-07 19:03 ` Eric Farman
2022-03-08 10:31 ` Claudio Imbrenda
2022-03-08 21:18 ` Eric Farman
2022-03-09 9:27 ` Claudio Imbrenda
2022-03-03 21:04 ` [PATCH kvm-unit-tests v1 5/6] s390x: smp: Create and use a non-waiting CPU restart Eric Farman
2022-03-07 15:31 ` Claudio Imbrenda
2022-03-03 21:04 ` [PATCH kvm-unit-tests v1 6/6] lib: s390x: smp: Convert remaining smp_sigp to _retry Eric Farman
2022-03-04 10:56 ` Janosch Frank
2022-03-04 14:15 ` Eric Farman
2022-03-07 14:42 ` Nico Boehr
2022-03-07 20:15 ` Eric Farman
2022-03-08 9:03 ` Janosch Frank
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