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Re: [Qemu-devel] [PATCH 3/5] x86: fill high bits of mtrr mask

From: Dr. David Alan Gilbert
Subject: Re: [Qemu-devel] [PATCH 3/5] x86: fill high bits of mtrr mask
Date: Fri, 17 Jun 2016 14:51:50 +0100
User-agent: Mutt/1.6.1 (2016-04-27)

* Paolo Bonzini (address@hidden) wrote:

> Note that the failure mode is pretty brutal since KVM reports an
> internal error right after restarting on the destination, and who knows
> what used to happen before the assertion was introduced.  All MSRs after
> MTRRs would be ignored by KVM!

I think we got lucky because the MTRRs were close to the last MSRs
in the list, there was only some MCG/MCE stuff after it which probably
wouldn't have been missed;  if the MTRR wasn't set I'm guessing someone
would have just had a behaviour that looked like dreadful performance
after migration perhaps?


> Migrating and checking the configuration complicates the code and,
> because it's only for a warning, doesn't save you from massaging the
> values to make things work.
> Paolo
Dr. David Alan Gilbert / address@hidden / Manchester, UK

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