Re: [Qemu-devel] Template for developing a Qemu device with PCIe and MSI-X

["Adnan Khaleel" <adnan@khaleel.us>]

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Isaku,

I'm having some difficulties building the sources, I get the following message

*akhaleel@yar95 qemu-q35 $ ./configure --help
: bad interpreter: No such file or directory

And I get a similar error while compiling seabios as well.

What shell are you using or am I missing something? I'm compiling from a typical bash shell and using gcc v4.4.0.

In vgabios, there is a requirement for bcc. Is that borland C compiler?

Thanks

Adnan
  _____  

From: Isaku Yamahata [mailto:yamahata@valinux.co.jp]
To: Adnan Khaleel [mailto:adnan@khaleel.us]
Cc: qemu-devel@nongnu.org
Sent: Wed, 18 Aug 2010 22:19:04 -0500
Subject: Re: [Qemu-devel] Template for developing a Qemu device with PCIe and MSI-X

On Wed, Aug 18, 2010 at 02:10:10PM -0500, Adnan Khaleel wrote:
  > Hello Qemu developers,
  >
  > I'm interested in developing a device model that plugs into Qemu that is based
  > on a PCIe interface and uses MSI-X. My goal is to ultimately attach a GPU
  > simulator to this PCIe interface and use the entire platfom (Qemu + GPU
  > simulator) for studying cpu, gpu interactions.
  > 
  > I'm not terribly familiar with the Qemu device model and I'm looking for some
  > assistance, perhaps a starting template for pcie and msi-x that would offer the
  > basic functionality that I could then build upon.
  > 
  > I have looked at the various devices that already modelled that are included
  > with Qemu (v0.12.5 at least) and I've noticed several a few pci devices, eg;
  > ne2k and cirrus-pci etc, however only one device truly seems to utilize both
  > the technologies that I'm interested in and that is the virtio-pci.c
  > 
  > I'm not sure what virtio-pci does so I'm not sure if that is a suitable
  > starting point for me.
  > 
  > Any help, suggestions etc would be extremely helpful and much appreciated.
  
  Qemu doesn't support pcie at the moment.
  Only partial patches have been merged, still more patches have to
  be merged for pcie to fully work. The following repo is available.
  
  git clone http://people.valinux.co.jp/~yamahata/qemu/q35/qemu
  git clone http://people.valinux.co.jp/~yamahata/qemu/q35/seabios
  git clone http://people.valinux.co.jp/~yamahata/qemu/q35/vgabios
  
  Note: patched seabios and vgabios are needed, you have to pass ACPI DSDT
  for q35.
  example:
  qemu-system-x86_64 -M pc_q35 -acpitable load_header,data=roms/seabios/src/q35-acpi-dsdt.aml
  
  This repo is for those who want to try/develop pcie support,
  not for upstream merge. So they include patches unsuitable for upstream.
  The repo includes pcie port switch emulator which utilize pcie and
  MSI(not MSI-X).
  
  The difference between PCI device and PCIe device is configuration
  space size.
  By setting PCIDeviceInfo::is_express = 1, you'll get 4K configuration
  space. Helper functions for pcie are found in qemu/hw/pcie.c
  For msi-x, see qemu/hw/msix.c.
  
  Thanks,
  -- 
  yamahata
    

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