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

[Adnan Khaleel]

I'm not sure what the problem was but I had checked out the code on a windows machine and then copied it over to a linux box. That was causing problems somehow.

I've managed to compile qemu and seabios but vgabios is taking forever to compile. The problem seems to be bcc. I've tried a simple helloworld program and even that seems to be taking forever to compile. Not sure if there is something wrong with my bcc install.

AK

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From: Isaku Yamahata [mailto:address@hidden
To: Adnan Khaleel [mailto:address@hidden
Cc: address@hidden
Sent: Fri, 20 Aug 2010 00:22:03 -0500
Subject: Re: [Qemu-devel] Template for developing a Qemu device with PCIe?and MSI-X

On Thu, Aug 19, 2010 at 01:32:42PM -0500, Adnan Khaleel wrote:
> Isaku,
>
> I'm having some difficulties building the sources, I get the following message
>
> *address@hidden 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.

I'm not sure. configure script isn't modified.
Can you compile normal qemu?
The first line of the script is #!/bin/sh. I suppose you have /bin/sh.


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

No. Most Linux destro has bcc package. Just you need to install it like
yum install bcc or something.

Thanks,


>
> Thanks
>
> Adnan
>
> ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
> From: Isaku Yamahata [mailto:address@hidden]
> To: Adnan Khaleel [mailto:address@hidden]
> Cc: address@hidden
> 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=""> > 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
>

--
yamahata