Re: [Xen-devel] [PATCH for 4.5 v7 1/1] Add mmio_hole_size

[Wei Liu <wei.liu2@xxxxxxxxxx>]

On Tue, Oct 14, 2014 at 11:56:22AM -0400, Konrad Rzeszutek Wilk wrote:
> On Mon, Oct 13, 2014 at 08:51:19AM -0400, Don Slutz wrote:
> > If you add enough PCI devices then all mmio may not fit below 4G
> > which may not be the layout the user wanted. This allows you to
> > increase the below 4G address space that PCI devices can use and
> > therefore in more cases not have any mmio that is above 4G.
> > 
> > There are real PCI cards that do not support mmio over 4G, so if you
> > want to emulate them precisely, you may also need to increase the
> > space below 4G for them. There are drivers for these cards that also
> > do not work if they have their mmio space mapped above 4G.
> > 
> > This allows growing the MMIO hole to the size needed.
> > 
> > This may help with using pci passthru and HVM.
> > 
> > Signed-off-by: Don Slutz <dslutz@xxxxxxxxxxx>
> 
> 
> Wei, Ian, Stefano, Ian,
> 
> I am OK with this patch going in Xen 4.5 (as a release-manager)
> but it can't go anywhere unless there is an Ack/Review.
> 
> P.S.
> Also added Wei to the CC list.

I didn't follow this closely. ISTR there's disagreement on whether this
is the correct approach to fix this bug. Have we reached consent that we
should use this approach?

Wei.

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