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xen-devel
Re: [Xen-devel] [PATCH 02/12] early PV on HVM
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To: |
Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx> |
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Subject: |
Re: [Xen-devel] [PATCH 02/12] early PV on HVM |
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From: |
Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx> |
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Date: |
Tue, 8 Jun 2010 16:55:33 +0100 |
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Cc: |
"jeremy@xxxxxxxx" <jeremy@xxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx>, Stefano Stabellini <Stefano.Stabellini@xxxxxxxxxxxxx>, "Yaozu \(Eddie\) Dong" <eddie.dong@xxxxxxxxx>, "linux-kernel@xxxxxxxxxxxxxxx" <linux-kernel@xxxxxxxxxxxxxxx>, "ddutile@xxxxxxxxxx" <ddutile@xxxxxxxxxx>, "sheng@xxxxxxxxxxxxxxx" <sheng@xxxxxxxxxxxxxxx> |
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Tue, 08 Jun 2010 08:57:36 -0700 |
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<20100608134637.GA5998@xxxxxxxxxxxxxxxxxxx> |
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References: |
<1275570645-27189-1-git-send-email-stefano.stabellini@xxxxxxxxxxxxx> <1275570645-27189-2-git-send-email-stefano.stabellini@xxxxxxxxxxxxx> <20100604202008.GB17645@xxxxxxxxxxxxxxxxxxx> <alpine.DEB.2.00.1006071518050.3401@kaball-desktop> <20100608134637.GA5998@xxxxxxxxxxxxxxxxxxx> |
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Alpine 2.00 (DEB 1167 2008-08-23) |
On Tue, 8 Jun 2010, Konrad Rzeszutek Wilk wrote:
> > > > + HYPERVISOR_shared_info = (struct shared_info *)shared_info_page;
> > > > +
> > > > + /* Don't do the full vcpu_info placement stuff until we have a
> > > > + possible map and a non-dummy shared_info. */
> > >
> > > Might want to mention where the full vpcu placement is done.
> >
> > The comment is not accurate, we actually don't do any vcpu_info
> > placement on hvm because it is not very useful there.
> > Better just to remove the comment (I have done so in my tree).
> >
> > > > + per_cpu(xen_vcpu, 0) = &HYPERVISOR_shared_info->vcpu_info[0];
> > >
> So.. what is the purpose of the per_cpu(xen_vcpu, 0) then?
>
the vcpu info placement memory area is stored in per_cpu(xen_vcpu_info, cpu);
per_cpu(xen_vcpu, cpu) is just a pointer to that area if it is
available, otherwise it points to the vcpu_info struct in the shared
info page.
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