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[Xen-devel] Re: [PATCH 1/3] xen: pvhvm: allow user to request no emulate

To: Stefano Stabellini <Stefano.Stabellini@xxxxxxxxxxxxx>
Subject: [Xen-devel] Re: [PATCH 1/3] xen: pvhvm: allow user to request no emulated device unplug
From: Ian Campbell <Ian.Campbell@xxxxxxxxxxxxx>
Date: Thu, 19 Aug 2010 11:50:07 +0100
Cc: Fitzhardinge <jeremy@xxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx>, Jeremy
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On Thu, 2010-08-19 at 11:37 +0100, Stefano Stabellini wrote:
> On Thu, 19 Aug 2010, Ian Campbell wrote:
> >     if (r && !(r == XEN_PLATFORM_ERR_MAGIC &&
> > +                   (xen_emul_unplug != -1) &&
> >                     (xen_emul_unplug & XEN_UNPLUG_IGNORE)))
> 
> I wouldn't add xen_emul_unplug != -1 because it should be clear that
> xen_emul_unplug & XEN_UNPLUG_IGNORE always implies xen_emul_unplug != -1.

That's not correct since -1 is all 1s. So you can get a false positive
for "xen_emul_unplug & XEN_UNPLUG_IGNORE" if xen_emul_unplug == -1.

Ian.



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