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Re: [Qemu-devel] [PATCH v4 for-2.3 13/25] hw/acpi: remove from root bus
From: |
Michael S. Tsirkin |
Subject: |
Re: [Qemu-devel] [PATCH v4 for-2.3 13/25] hw/acpi: remove from root bus 0 the crs resources used by other busses. |
Date: |
Mon, 9 Mar 2015 09:44:24 +0100 |
On Sun, Mar 08, 2015 at 02:46:28PM -0400, Kevin O'Connor wrote:
> On Sun, Mar 08, 2015 at 07:34:34PM +0100, Michael S. Tsirkin wrote:
> > On Sun, Mar 08, 2015 at 12:13:40PM -0400, Kevin O'Connor wrote:
> > > If I read this correctly, it looks like a machine with two root buses
> > > and 20 devices, each with one memory range and one io range, would end
> > > up with 40 CRS ranges (ie, a CRS range for every resource).
> >
> > I think that's only if you stick multiple devices directly behind the
> > bridge. Looks like with a single pci bridge behind root, there will
> > only be 2 ranges.
>
> Yeah, that makes sense, so doesn't seem to be a problem.
>
> > Maybe try to enforce this sane topology?
> >
> > > It also
> > > looks like this furthers the requirement that the guest firmware
> > > assign the PCI resources prior to QEMU being able to generate the ACPI
> > > tables.
> >
> > That seems unavoidable unless we want to assign ranges from
> > hardware/management.
> > Which I think would be a mistake: management doesn't really know,
> > or care.
>
> I understand. I think what would help me is if we could document
> somewhere that the firmware has to assign PCI resources before
> querying the bios tables and that it is the *only* pre-requisite for
> querying them. Looking now, though, I don't see any fw_cfg
> documentation in the repo, so I'm not sure where that could be added.
>
> Thanks,
> -Kevin
Sigh. Might make a GSoC project?
--
MST
- [Qemu-devel] [PATCH v4 for-2.3 12/25] hw/acpi: add _CRS method for extra root busses, (continued)
- [Qemu-devel] [PATCH v4 for-2.3 12/25] hw/acpi: add _CRS method for extra root busses, Marcel Apfelbaum, 2015/03/08
- [Qemu-devel] [PATCH v4 for-2.3 13/25] hw/acpi: remove from root bus 0 the crs resources used by other busses., Marcel Apfelbaum, 2015/03/08
- Re: [Qemu-devel] [PATCH v4 for-2.3 13/25] hw/acpi: remove from root bus 0 the crs resources used by other busses., Michael S. Tsirkin, 2015/03/08
- Re: [Qemu-devel] [PATCH v4 for-2.3 13/25] hw/acpi: remove from root bus 0 the crs resources used by other busses., Kevin O'Connor, 2015/03/08
- Re: [Qemu-devel] [PATCH v4 for-2.3 13/25] hw/acpi: remove from root bus 0 the crs resources used by other busses.,
Michael S. Tsirkin <=
- Re: [Qemu-devel] [PATCH v4 for-2.3 13/25] hw/acpi: remove from root bus 0 the crs resources used by other busses., Stefan Hajnoczi, 2015/03/10
[Qemu-devel] [PATCH v4 for-2.3 15/25] hw/pci: made pci_bus_is_root a PCIBusClass method, Marcel Apfelbaum, 2015/03/08
[Qemu-devel] [PATCH v4 for-2.3 16/25] hw/pci: made pci_bus_num a PCIBusClass method, Marcel Apfelbaum, 2015/03/08
[Qemu-devel] [PATCH v4 for-2.3 14/25] hw/pci: move pci bus related code to separate files, Marcel Apfelbaum, 2015/03/08
[Qemu-devel] [PATCH v4 for-2.3 18/25] hw/pci: removed 'rootbus nr is 0' assumption from qmp_pci_query, Marcel Apfelbaum, 2015/03/08
[Qemu-devel] [PATCH v4 for-2.3 17/25] hw/pci: introduce TYPE_PCI_MAIN_HOST_BRIDGE interface, Marcel Apfelbaum, 2015/03/08
[Qemu-devel] [PATCH v4 for-2.3 19/25] hw/pci: implement iteration over multiple host bridges, Marcel Apfelbaum, 2015/03/08
[Qemu-devel] [PATCH v4 for-2.3 20/25] hw/pci: introduce PCI Expander Bridge (PXB), Marcel Apfelbaum, 2015/03/08
[Qemu-devel] [PATCH v4 for-2.3 22/25] hw/pci: piix - suport multiple host bridges, Marcel Apfelbaum, 2015/03/08
[Qemu-devel] [PATCH v4 for-2.3 24/25] hw/pci_bus: add support for NUMA nodes, Marcel Apfelbaum, 2015/03/08