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[Qemu-devel] Re: [PATCH 0/8] seabios: pci: multi pci bus support
From: |
Isaku Yamahata |
Subject: |
[Qemu-devel] Re: [PATCH 0/8] seabios: pci: multi pci bus support |
Date: |
Fri, 18 Jun 2010 11:02:02 +0900 |
User-agent: |
Mutt/1.5.19 (2009-01-05) |
On Thu, Jun 17, 2010 at 02:17:20PM +0300, Michael S. Tsirkin wrote:
> On Thu, Jun 17, 2010 at 08:03:08PM +0900, Isaku Yamahata wrote:
> > This patch set allows seabios to initialize multi pci bus and 64bit BAR.
> >
> > Currently seabios is able to initialize only pci root bus.
> > However multi pci bus support is wanted because
> > - more pci bus is wanted in qemu for many slots
> > - pci express support is commin in qemu which requires multi pci bus.
> > those patches on Qemu part are under way, though.
>
> Not that I object, but - does it really require multi bus? Why?
I should have explained about pci express a bit more.
Express defines root/upstream/upstream port. They are shown
to software as pci-to-pci bride.
Express slot to which express device is inserted is
under a root or downstream port. That means multi bus.
Native hot plug is implemented in root or downstream port.
Again that means multi bus.
I heard that some windows device driver checks pci-to-pci
bridge existence. Perhaps others may know this better.
--
yamahata
- [Qemu-devel] [PATCH 0/8] seabios: pci: multi pci bus support, Isaku Yamahata, 2010/06/17
- [Qemu-devel] [PATCH 7/8] seabios: pciinit: pci bridge bus initialization., Isaku Yamahata, 2010/06/17
- [Qemu-devel] [PATCH 2/8] seabios: pciinit: factor out pci bar region allocation logic., Isaku Yamahata, 2010/06/17
- [Qemu-devel] [PATCH 4/8] seabios: pciinit: make pci bar assigner preferchable memory aware., Isaku Yamahata, 2010/06/17
- [Qemu-devel] [PATCH 1/8] seabios: pci: introduce foreachpci_in_bus() helper macro., Isaku Yamahata, 2010/06/17
- [Qemu-devel] [PATCH 5/8] seabios: pciinit: factor out bar offset calculation., Isaku Yamahata, 2010/06/17
- [Qemu-devel] [PATCH 8/8] seabios: pciinit: initialize pci bridge filtering registers., Isaku Yamahata, 2010/06/17
- [Qemu-devel] [PATCH 6/8] seabios: pciinit: make bar offset calculation pci bridge aware., Isaku Yamahata, 2010/06/17
- [Qemu-devel] [PATCH 3/8] seabios: pciinit: make pci memory space assignment 64bit aware., Isaku Yamahata, 2010/06/17
- [Qemu-devel] Re: [PATCH 0/8] seabios: pci: multi pci bus support, Michael S. Tsirkin, 2010/06/17
- [Qemu-devel] Re: [PATCH 0/8] seabios: pci: multi pci bus support,
Isaku Yamahata <=