From: David Hildenbrand <david@redhat.com>
To: "Alex Bennée" <alex.bennee@linaro.org>
Cc: qemu-devel@nongnu.org,
Matthew Rosato <mjrosato@linux.vnet.ibm.com>,
thuth@redhat.com, Eduardo Habkost <ehabkost@redhat.com>,
cohuck@redhat.com,
Richard Henderson <richard.henderson@linaro.org>,
Alexander Graf <agraf@suse.de>,
Markus Armbruster <armbru@redhat.com>,
borntraeger@de.ibm.com, Igor Mammedov <imammedo@redhat.com>,
Paolo Bonzini <pbonzini@redhat.com>
Subject: Re: [Qemu-devel] [PATCH v5 11/22] s390x: allow only 1 CPU with TCG
Date: Wed, 13 Sep 2017 18:25:10 +0200 [thread overview]
Message-ID: <febf18fb-7437-0ce0-6669-1c7e964eea07@redhat.com> (raw)
In-Reply-To: <87lglia85d.fsf@linaro.org>
On 13.09.2017 18:13, Alex Bennée wrote:
>
> David Hildenbrand <david@redhat.com> writes:
>
>> Specifying more than 1 CPU (e.g. -smp 5) leads to SIGP errors (the
>> guest tries to bring these CPUs up but fails), because we don't support
>> multiple CPUs on s390x under TCG.
>>
>> Let's bail out if more than 1 is specified, so we don't raise people's
>> hope.
>
> Why does this restriction exist? Without MTTCG enabled -smp > 1 should
> be safe from any races.
Because the actual SIGP code (instruction to start/stop ... CPUs) is not
implemented yet.
--
Thanks,
David
next prev parent reply other threads:[~2017-09-13 16:25 UTC|newest]
Thread overview: 56+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-09-13 13:23 [Qemu-devel] [PATCH v5 00/22] s390x cleanups and CPU hotplug via device_add David Hildenbrand
2017-09-13 13:23 ` [Qemu-devel] [PATCH v5 01/22] exec, dump, i386, ppc, s390x: don't include exec/cpu-all.h explicitly David Hildenbrand
2017-09-13 13:23 ` [Qemu-devel] [PATCH v5 02/22] cpu: drop old comments describing members David Hildenbrand
2017-09-13 13:23 ` [Qemu-devel] [PATCH v5 03/22] s390x: get rid of s390-virtio.c David Hildenbrand
2017-09-13 16:34 ` David Hildenbrand
2017-09-13 16:54 ` Cornelia Huck
2017-09-13 13:23 ` [Qemu-devel] [PATCH v5 04/22] s390x: rename s390-virtio.h to s390-virtio-hcall.h David Hildenbrand
2017-09-13 13:24 ` [Qemu-devel] [PATCH v5 05/22] s390x: move s390_virtio_hypercall() " David Hildenbrand
2017-09-13 13:24 ` [Qemu-devel] [PATCH v5 06/22] s390x: move subsystem_reset() to s390-virtio-ccw.h David Hildenbrand
2017-09-13 13:24 ` [Qemu-devel] [PATCH v5 07/22] target/s390x: move some s390x typedefs to cpu-qom.h David Hildenbrand
2017-09-13 14:27 ` Thomas Huth
2017-09-13 14:44 ` David Hildenbrand
2017-09-13 15:04 ` Thomas Huth
2017-09-13 13:24 ` [Qemu-devel] [PATCH v5 08/22] s390x: move sclp_service_call() to sclp.h David Hildenbrand
2017-09-13 14:29 ` Thomas Huth
2017-09-13 14:42 ` David Hildenbrand
2017-09-13 15:21 ` Cornelia Huck
2017-09-13 15:23 ` David Hildenbrand
2017-09-13 13:24 ` [Qemu-devel] [PATCH v5 09/22] target/s390x: use trigger_pgm_exception() in s390_cpu_handle_mmu_fault() David Hildenbrand
2017-09-13 13:24 ` [Qemu-devel] [PATCH v5 10/22] target/s390x: use program_interrupt() in per_check_exception() David Hildenbrand
2017-09-13 13:24 ` [Qemu-devel] [PATCH v5 11/22] s390x: allow only 1 CPU with TCG David Hildenbrand
2017-09-13 14:06 ` Igor Mammedov
2017-09-13 16:13 ` Alex Bennée
2017-09-13 16:25 ` David Hildenbrand [this message]
2017-09-15 13:17 ` Alex Bennée
2017-09-15 13:36 ` David Hildenbrand
2017-09-13 13:24 ` [Qemu-devel] [PATCH v5 12/22] target/s390x: set cpu->id for linux user when realizing David Hildenbrand
2017-09-13 13:24 ` [Qemu-devel] [PATCH v5 13/22] target/s390x: use "core-id" for cpu number/address/id handling David Hildenbrand
2017-09-13 13:24 ` [Qemu-devel] [PATCH v5 14/22] target/s390x: rename next_cpu_id to next_core_id David Hildenbrand
2017-09-13 13:24 ` [Qemu-devel] [PATCH v5 15/22] s390x: print CPU definitions in sorted order David Hildenbrand
2017-09-13 13:24 ` [Qemu-devel] [PATCH v5 16/22] s390x: allow cpu hotplug via device_add David Hildenbrand
2017-09-28 6:01 ` Thomas Huth
2017-09-28 13:00 ` David Hildenbrand
2017-09-28 13:36 ` David Hildenbrand
2017-09-13 13:24 ` [Qemu-devel] [PATCH v5 17/22] s390x: CPU hot unplug via device_del cannot work for now David Hildenbrand
2017-09-13 15:45 ` Cornelia Huck
2017-09-13 13:24 ` [Qemu-devel] [PATCH v5 18/22] s390x: implement query-hotpluggable-cpus David Hildenbrand
2017-09-13 14:42 ` Igor Mammedov
2017-09-13 15:49 ` Cornelia Huck
2017-09-13 15:50 ` David Hildenbrand
2017-10-02 7:46 ` Markus Armbruster
2017-10-04 8:04 ` Cornelia Huck
2017-10-04 12:42 ` Markus Armbruster
2017-10-04 13:09 ` Cornelia Huck
2017-10-06 17:17 ` Markus Armbruster
2017-10-09 10:31 ` Marc-André Lureau
2017-09-13 13:24 ` [Qemu-devel] [PATCH v5 19/22] s390x: get rid of cpu_states and use possible_cpus instead David Hildenbrand
2017-09-13 14:45 ` Igor Mammedov
2017-09-13 13:24 ` [Qemu-devel] [PATCH v5 20/22] s390x: get rid of cpu_s390x_create() David Hildenbrand
2017-09-13 13:24 ` [Qemu-devel] [PATCH v5 21/22] s390x: generate sclp cpu information from possible_cpus David Hildenbrand
2017-09-13 13:24 ` [Qemu-devel] [PATCH v5 22/22] s390x: allow CPU hotplug in random core-id order David Hildenbrand
2017-09-13 14:46 ` Igor Mammedov
2017-09-13 16:58 ` [Qemu-devel] [PATCH v5 00/22] s390x cleanups and CPU hotplug via device_add Cornelia Huck
2017-10-02 7:47 ` Markus Armbruster
2017-10-04 8:05 ` Cornelia Huck
2017-10-20 15:45 ` David Hildenbrand
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