From: David Gibson <david@gibson.dropbear.id.au>
To: Bharata B Rao <bharata@linux.vnet.ibm.com>
Cc: mjrosato@linux.vnet.ibm.com, mdroth@linux.vnet.ibm.com,
aik@ozlabs.ru, agraf@suse.de, qemu-devel@nongnu.org,
pbonzini@redhat.com, qemu-ppc@nongnu.org,
tyreld@linux.vnet.ibm.com, nfont@linux.vnet.ibm.com,
imammedo@redhat.com, afaerber@suse.de, ehabkost@redhat.com
Subject: Re: [Qemu-devel] [PATCH v7 01/13] machine: Don't allow CPU toplogies with partially filled cores
Date: Fri, 29 Jan 2016 14:52:30 +1100 [thread overview]
Message-ID: <20160129035230.GL23043@voom.redhat.com> (raw)
In-Reply-To: <1453960195-15181-2-git-send-email-bharata@linux.vnet.ibm.com>
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On Thu, Jan 28, 2016 at 11:19:43AM +0530, Bharata B Rao wrote:
> Prevent guests from booting with CPU topologies that have partially
> filled CPU cores or can result in partially filled CPU cores after
> CPU hotplug like
>
> -smp 15,sockets=1,cores=4,threads=4,maxcpus=16 or
> -smp 15,sockets=1,cores=4,threads=4,maxcpus=17.
>
> This is enforced by introducing MachineClass::validate_smp_config()
> that gets called from generic SMP parsing code. Machine type versions
> that want to enforce this can define this to the generic version
> provided.
>
> Only sPAPR and PC machine types starting from version 2.6 enforce this in
> this patch.
>
> Signed-off-by: Bharata B Rao <bharata@linux.vnet.ibm.com>
I've been kind of lost in the back and forth about
threads/cores/sockets.
What, in the end, is the rationale for allowing partially filled
sockets, but not partially filled cores?
--
David Gibson | I'll have my music baroque, and my code
david AT gibson.dropbear.id.au | minimalist, thank you. NOT _the_ _other_
| _way_ _around_!
http://www.ozlabs.org/~dgibson
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next prev parent reply other threads:[~2016-01-29 4:06 UTC|newest]
Thread overview: 37+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-01-28 5:49 [Qemu-devel] [PATCH v7 00/13] sPAPR CPU hotplug Bharata B Rao
2016-01-28 5:49 ` [Qemu-devel] [PATCH v7 01/13] machine: Don't allow CPU toplogies with partially filled cores Bharata B Rao
2016-01-28 19:04 ` Eduardo Habkost
2016-01-29 3:52 ` David Gibson [this message]
2016-01-29 14:24 ` Eduardo Habkost
2016-01-29 15:10 ` Igor Mammedov
2016-01-29 15:36 ` Eduardo Habkost
2016-01-29 16:52 ` Igor Mammedov
2016-01-29 17:24 ` Eduardo Habkost
2016-02-01 9:41 ` Igor Mammedov
2016-02-03 17:38 ` Eduardo Habkost
2016-02-04 9:38 ` Igor Mammedov
2016-01-28 5:49 ` [Qemu-devel] [PATCH v7 02/13] exec: Remove cpu from cpus list during cpu_exec_exit() Bharata B Rao
2016-01-28 19:19 ` Eduardo Habkost
2016-01-29 6:14 ` Bharata B Rao
2016-01-28 5:49 ` [Qemu-devel] [PATCH v7 03/13] exec: Do vmstate unregistration from cpu_exec_exit() Bharata B Rao
2016-01-28 5:49 ` [Qemu-devel] [PATCH v7 04/13] cpu: Don't realize CPU from cpu_generic_init() Bharata B Rao
2016-01-28 5:49 ` [Qemu-devel] [PATCH v7 05/13] cpu: Reclaim vCPU objects Bharata B Rao
2016-02-19 15:21 ` Thomas Huth
2016-01-28 5:49 ` [Qemu-devel] [PATCH v7 06/13] cpu: Add a sync version of cpu_remove() Bharata B Rao
2016-01-28 5:49 ` [Qemu-devel] [PATCH v7 07/13] xics, xics_kvm: Handle CPU unplug correctly Bharata B Rao
2016-01-28 5:49 ` [Qemu-devel] [PATCH v7 08/13] target-ppc: Introduce PowerPC specific CPU core device Bharata B Rao
2016-02-01 2:39 ` David Gibson
2016-01-28 5:49 ` [Qemu-devel] [PATCH v7 09/13] spapr: Enable CPU hotplug for pseries-2.6 and add CPU DRC DT entries Bharata B Rao
2016-01-28 5:49 ` [Qemu-devel] [PATCH v7 10/13] spapr: CPU hotplug support Bharata B Rao
2016-02-01 3:07 ` David Gibson
2016-01-28 5:49 ` [Qemu-devel] [PATCH v7 11/13] spapr: CPU hot unplug support Bharata B Rao
2016-02-01 3:13 ` David Gibson
2016-01-28 5:49 ` [Qemu-devel] [PATCH v7 12/13] qmp: Add query-ppc-cpu-cores command Bharata B Rao
2016-01-28 20:52 ` Eric Blake
2016-01-29 6:34 ` Bharata B Rao
2016-01-29 15:45 ` Igor Mammedov
2016-02-01 8:43 ` Bharata B Rao
2016-02-01 9:56 ` Igor Mammedov
2016-01-28 5:49 ` [Qemu-devel] [PATCH v7 13/13] hmp: Add "info ppc-cpu-cores" command Bharata B Rao
2016-01-28 21:56 ` Eric Blake
2016-01-29 6:49 ` Bharata B Rao
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