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Re: [Qemu-devel] [qom/qom-cpu PATCH] i386: invtsc migration blocker is r

From: Eduardo Habkost
Subject: Re: [Qemu-devel] [qom/qom-cpu PATCH] i386: invtsc migration blocker is redudant
Date: Wed, 28 May 2014 22:10:22 -0300
User-agent: Mutt/1.5.21 (2010-09-15)

On Tue, May 27, 2014 at 10:51:28PM -0300, Marcelo Tosatti wrote:
> On Tue, May 27, 2014 at 12:55:01PM -0300, Eduardo Habkost wrote:
> > On Tue, May 27, 2014 at 11:39:20AM -0300, Marcelo Tosatti wrote:
> > > 
> > > Migration blocker is redudant: blocking savevm is sufficient.
> > > 
> > 
> > Removing the redundancy looks welcome, but at the same time the
> > migrate_add_blocker() call ensured we had a clearer error message (I
> > mean: if we did mention invtsc in the error message, which we still
> > don't, but should).
> Agree the error message should provide further information.
> For savevm its not possible, without further changes, to 
> improve error message.
> Do you want to maintain migration blocker to provide 
> the additional "blocked by invtsc feature of CPU device"
> or do you want to remove migration blocker and have
> "blocked by CPU device" ?

Having migration blocked by a CPU feature is something we never did
before and likely to surprise a few users. So I believe a clearer error
message mentioning invtsc is worth the extra code.


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