linux-kernel - Re: [GIT PULL] First batch of KVM changes for 4.1

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Message-ID: <55353058.2000008@redhat.com>
Date:	Mon, 20 Apr 2015 18:59:04 +0200
From:	Paolo Bonzini <pbonzini@...hat.com>
To:	Marcelo Tosatti <mtosatti@...hat.com>
CC:	Peter Zijlstra <peterz@...radead.org>,
	torvalds@...ux-foundation.org, linux-kernel@...r.kernel.org,
	gleb@...nel.org, kvm@...r.kernel.org,
	Ralf Baechle <ralf@...ux-mips.org>, luto@...nel.org
Subject: Re: [GIT PULL] First batch of KVM changes for 4.1

On 17/04/2015 22:18, Marcelo Tosatti wrote:
> The bug which this is fixing is very rare, have no memory of a report.
> 
> In fact, its even difficult to create a synthetic reproducer.

But then why was the task migration notifier even in Jeremy's original
code for Xen?  Was it supposed to work even on non-synchronized TSC?

If that's the case, then it could be reverted indeed; but then why did
you commit this patch to 4.1?  Did you think of something that would
cause the seqcount-like protocol to fail, and that turned out not to be
the case later?  I was only following the mailing list sparsely in March.

Paolo
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