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

[Andy Lutomirski]

On Mon, Apr 20, 2015 at 9:59 AM, Paolo Bonzini <pbonzini@xxxxxxxxxx> wrote:
>
>
> 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.

I don't think anyone ever tried that hard to test this stuff.  There
was an infinte loop that Firefox was triggering as a KVM guest
somewhat reliably until a couple months ago in the same vdso code.  :(

--Andy
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/