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[Qemu-devel] should KVM or userspace be the one which decides what MIPID


From: Peter Maydell
Subject: [Qemu-devel] should KVM or userspace be the one which decides what MIPIDR/affinity values to assign to vcpus?
Date: Mon, 8 Jun 2015 11:52:50 +0100

On 8 June 2015 at 11:32, Igor Mammedov <address@hidden> wrote:
> On Thu, 4 Jun 2015 18:17:39 +0100
> Peter Maydell <address@hidden> wrote:
>> On 4 June 2015 at 17:40, Shlomo Pongratz <address@hidden> 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...

-- PMM



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