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Re: [Qemu-ppc] [Qemu-devel] [PATCH 0/1] pci: allow 0 address for PCI IO/

From: Michael S. Tsirkin
Subject: Re: [Qemu-ppc] [Qemu-devel] [PATCH 0/1] pci: allow 0 address for PCI IO/MEM regions
Date: Tue, 13 Jan 2015 18:17:56 +0200

On Tue, Jan 13, 2015 at 05:54:46PM +0200, Michael S. Tsirkin wrote:
> I think we already do this for PC:
>       commit 83d08f2673504a299194dcac1657a13754b5932a
>       Author: Michael S. Tsirkin <address@hidden>
>       Date:   Tue Oct 29 13:57:34 2013 +0100
>           pc: map PCI address space as catchall region for not mapped 
> addresses
> but we need to find and fix all other targets.

BTW this is very easy to test.
Add an unused device (like ivshmem) enable BAR, and set it to 0.
System should survive, as opposed to hanging.

But the big question is whether this is the right
thing to do for each platform.
For PIIX whatever is not system memory, is PCI.
But other boxes might have a different view of the matter.


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