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Re: [Qemu-devel] [PATCH RFC V3 1/4] Use Aff1 with mpidr This is an impro


From: Pavel Fedin
Subject: Re: [Qemu-devel] [PATCH RFC V3 1/4] Use Aff1 with mpidr This is an improved and KVM-aware alternative to
Date: Mon, 08 Jun 2015 10:50:28 +0300

> I think it would be less confusing to store the entire MPIDR
> here, and then mask it out if there are places that only
> want the affinity bits.

 I thought about it when i developed this, but in my implementation affinity 
bits are assigned during CPU instantiation, while feature bits can be added 
later, during realize. I could tweak set_feature() to sync up MPIDR value but 
perhaps it isn't the best thing to do.
 Additionally, currently we support only ARM_FEATURE_V7MP, which is 32-bit 
only. I believe this would be a more complex modification which would touch 
more of 32-bit code.
 So would it be acceptable to leave mpidr handling as it is?

Kind regards,
Pavel Fedin
Expert Engineer
Samsung Electronics Research center Russia





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