From mboxrd@z Thu Jan  1 00:00:00 1970
Received: from eggs.gnu.org ([2001:4830:134:3::10]:55165)
	by lists.gnu.org with esmtp (Exim 4.71)
	(envelope-from <marc.zyngier@arm.com>) id 1Z2HGb-00007m-U2
	for qemu-devel@nongnu.org; Tue, 09 Jun 2015 07:00:26 -0400
Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71)
	(envelope-from <marc.zyngier@arm.com>) id 1Z2HGW-0007w6-BR
	for qemu-devel@nongnu.org; Tue, 09 Jun 2015 07:00:25 -0400
Received: from foss.arm.com ([217.140.101.70]:41360)
	by eggs.gnu.org with esmtp (Exim 4.71)
	(envelope-from <marc.zyngier@arm.com>) id 1Z2HGW-0007uj-57
	for qemu-devel@nongnu.org; Tue, 09 Jun 2015 07:00:20 -0400
Message-ID: <5576C559.2000902@arm.com>
Date: Tue, 09 Jun 2015 11:52:09 +0100
From: Marc Zyngier <marc.zyngier@arm.com>
MIME-Version: 1.0
References: <CAFEAcA-AY7rqcWmd13mpBuBWugbqwjzMdWfWt2N2rV0=7LT3KA@mail.gmail.com>
In-Reply-To: <CAFEAcA-AY7rqcWmd13mpBuBWugbqwjzMdWfWt2N2rV0=7LT3KA@mail.gmail.com>
Content-Type: text/plain; charset=windows-1252
Content-Transfer-Encoding: 7bit
Subject: Re: [Qemu-devel] should KVM or userspace be the one which decides
 what MIPIDR/affinity values to assign to vcpus?
List-Id: <qemu-devel.nongnu.org>
List-Unsubscribe: <https://lists.nongnu.org/mailman/options/qemu-devel>,
	<mailto:qemu-devel-request@nongnu.org?subject=unsubscribe>
List-Archive: <http://lists.nongnu.org/archive/html/qemu-devel>
List-Post: <mailto:qemu-devel@nongnu.org>
List-Help: <mailto:qemu-devel-request@nongnu.org?subject=help>
List-Subscribe: <https://lists.nongnu.org/mailman/listinfo/qemu-devel>,
	<mailto:qemu-devel-request@nongnu.org?subject=subscribe>
To: Peter Maydell <peter.maydell@linaro.org>, Igor Mammedov <imammedo@redhat.com>
Cc: Shlomo Pongratz <shlomo.pongratz@huawei.com>, Shlomo Pongratz <shlomopongratz@gmail.com>, Pavel Fedin <p.fedin@samsung.com>, QEMU Developers <qemu-devel@nongnu.org>, Shannon Zhao <shannon.zhao@linaro.org>, Ashok Kumar <ashoks@broadcom.com>, "kvmarm@lists.cs.columbia.edu" <kvmarm@lists.cs.columbia.edu>

On 08/06/15 11:52, Peter Maydell wrote:
> On 8 June 2015 at 11:32, Igor Mammedov <imammedo@redhat.com> wrote:
>> On Thu, 4 Jun 2015 18:17:39 +0100
>> Peter Maydell <peter.maydell@linaro.org> wrote:
>>> On 4 June 2015 at 17:40, Shlomo Pongratz <shlomopongratz@gmail.com> wrote:
>>>  In order for it to work correctly we must use MPIDR values in
>>>  the device tree which match the MPIDR values the kernel has picked
>>>  for the vcpus, so ask KVM what those values are.
> 
>> Could we set QEMU's generated mpidr in kernel instead of pulling it from kernel,
>> like we do with APIC ID in x86 and fix kernel not to reset it its own value
>> (i.e. untie mpidr from vcpuid)?
>>
>> Then later we could move setting mpidr from kvm_arch_init_vcpu() into
>> board code which should be setting it, since it knows/defines what topology it has.
> 
> This is a question better asked on the kvmarm list (which I have cc'd),
> because that is where the kernel folks hang out...

Care to provide some context? Why is this required?

Thanks,

	M.
-- 
Jazz is not dead. It just smells funny...