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Re: [Qemu-devel] [PATCH RFC 3/3] hw/pci-host: catch acesses to unassigne
From: |
Michael S. Tsirkin |
Subject: |
Re: [Qemu-devel] [PATCH RFC 3/3] hw/pci-host: catch acesses to unassigned pci addresses |
Date: |
Mon, 2 Sep 2013 19:17:13 +0300 |
On Mon, Sep 02, 2013 at 05:05:10PM +0100, Peter Maydell wrote:
> On 2 September 2013 17:00, Michael S. Tsirkin <address@hidden> wrote:
> > On Mon, Sep 02, 2013 at 04:53:50PM +0100, Peter Maydell wrote:
> >> at the moment what happens is that the pci controller
> >> creates the PCI memory and io memory regions (or cheats
> >> by reusing the system memory space[*]),
>
> >> [*] I'm pretty sure this is a bug in all platforms that do it.
>
> > Well as usual this cheat originated with PIIX.
> > AFAIK PIIX actually has a shared bus for memory and PCI
> > so this is not a bug there, I think.
>
> It will be when you introduce this "return -1 for unassigned
> addresses", though, since you only want that to happen
> for PCI accesses, not system memory accesses, right?
>
> thanks
> -- PMM
What happens with PIIX is that everything that is not
in system memory is PCI.
So there's no such thing as "unassigned system memory
address": all unassigned addresses are PCI addresses.
--
MST
- Re: [Qemu-devel] [PATCH RFC 1/3] memory: allow MemoryRegion's priority field to accept negative values, (continued)
- [Qemu-devel] [PATCH RFC 3/3] hw/pci-host: catch acesses to unassigned pci addresses, Marcel Apfelbaum, 2013/09/02
- Re: [Qemu-devel] [PATCH RFC 3/3] hw/pci-host: catch acesses to unassigned pci addresses, Peter Maydell, 2013/09/02
- Re: [Qemu-devel] [PATCH RFC 3/3] hw/pci-host: catch acesses to unassigned pci addresses, Marcel Apfelbaum, 2013/09/02
- Re: [Qemu-devel] [PATCH RFC 3/3] hw/pci-host: catch acesses to unassigned pci addresses, Andreas Färber, 2013/09/02
- Re: [Qemu-devel] [PATCH RFC 3/3] hw/pci-host: catch acesses to unassigned pci addresses, Peter Maydell, 2013/09/02
- Re: [Qemu-devel] [PATCH RFC 3/3] hw/pci-host: catch acesses to unassigned pci addresses, Michael S. Tsirkin, 2013/09/02
- Re: [Qemu-devel] [PATCH RFC 3/3] hw/pci-host: catch acesses to unassigned pci addresses, Peter Maydell, 2013/09/02
- Re: [Qemu-devel] [PATCH RFC 3/3] hw/pci-host: catch acesses to unassigned pci addresses,
Michael S. Tsirkin <=
- Re: [Qemu-devel] [PATCH RFC 3/3] hw/pci-host: catch acesses to unassigned pci addresses, Peter Maydell, 2013/09/02
- Re: [Qemu-devel] [PATCH RFC 3/3] hw/pci-host: catch acesses to unassigned pci addresses, Marcel Apfelbaum, 2013/09/02
- Re: [Qemu-devel] [PATCH RFC 3/3] hw/pci-host: catch acesses to unassigned pci addresses, Michael S. Tsirkin, 2013/09/02
Re: [Qemu-devel] [PATCH RFC 0/3] pci: complete master abort protocol, Peter Maydell, 2013/09/02