Re: [Qemu-devel] q35 and ahci

[Jason Baron]

On Tue, Jul 03, 2012 at 08:52:50PM +0200, Alexander Graf wrote:
> On 03.07.2012, at 20:46, Jason Baron wrote:
> 
> > On Tue, Jul 03, 2012 at 08:41:29PM +0200, Alexander Graf wrote:
> >> On 03.07.2012, at 20:38, Jason Baron wrote:
> >> 
> >>> On Tue, Jul 03, 2012 at 08:25:52PM +0200, Alexander Graf wrote:
> >>>> On 03.07.2012, at 18:16, Jason Baron wrote:
> >>>> 
> >>>>> Hi,
> >>>>> 
> >>>>> Update on q35 testing with various os's.
> >>>>> 
> >>>>> Linux
> >>>>> -----
> >>>>> -RHEL6.3 installs + runs 
> >>>>> -Fedora 16 install + runs
> >>>>> -Fedora 17 - squashfs errors 
> >>>>> running on already installed f17 seems ok.
> >>>>> 
> >>>>> Windows
> >>>>> -------
> >>>>> -W7 - install error:
> >>>>> 
> >>>>> "A required cd/dvd device driver is missing. If you have a
> >>>>> driver floppy disk, CD, DVD, or USB flash drive, please insert it now.
> >>>>> "
> >>>>> 
> >>>>> Related to the new ahci controller, since if I go back to an
> >>>>> ide conroller it keeps going (albeit the install is *very* slow).
> >>>>> 
> >>>>> So I'm wondering if we need an ide compatibility mode? Or perhaps, there
> >>>>> are other ideas.
> >>>> 
> >>>> Does it work with AHCI and -M pc? It should. Last time I tried it did at 
> >>>> least :).
> >>>> 
> >>>> 
> >>>> Alex
> >>>> 
> >>>> 
> >>> 
> >>> Yes, adding the ahci controller to -M pc, I see a disk drive and the
> >>> controller show up in the device manager. I read in some of the ahci
> >>> commit messages that the cdrom device didn't show up. Did cdrom ever
> >>> work with ahci?
> >> 
> >> It did on Linux at least, yes. Does it work on Linux for you?
> >> 
> > 
> > I meant did a cdrom on the ahci controller configure on windows?
> > 
> > Yes, Linux seems to be happy with the drive and cdrom on the ahci. See
> > my above test results. (ich9-ahci is the default controller for q35).
> 
> Ah, good. I don't remember tbh. But I suppose since it doesn't work for you, 
> it's broken :). Do you have time to look into it?
> 

I have time to look at it (I'm trying to get q35 working on as many os's
as possible), but I'm far from an expert on ahci. So if you had some
time to look at it, that would be great. My q35 trees are at:

git://github.com/jibaron/q35-qemu.git
git://github.com/jibaron/q35-seabios.git

With a cmd line such as:

 /usr/local/bin/qemu-system-x86_64  -name "f16" -M pc_q35 -m 1G -smp 4
-hda ./f16.img --enable-kvm  -bios <path>/q35-seabios/out/bios.bin
-acpitable file=<path>/q35-seabios/out/q35-acpi-dsdt.aml  -monitor stdio

The error I run into is:

"A required cd/dvd device driver is missing. If you have a
driver floppy disk, CD, DVD, or USB flash drive, please insert it now.
"

> There are a bunch of debug #define's in the ide-core and ahci code that 
> should be able to point you to where it starts failing. It's probably easiest 
> to take it slow and find a way to only have the cdrom attached to ahci. 
> Otherwise the debug output will be full of disk stuff :).
> 

Thanks,

-Jason