Re: [Qemu-devel] [PATCH v8 5/7] libqos: Added test case for configuration changes in virtio-blk test

[Stefan Hajnoczi <stefanha@redhat.com>]

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On Mon, Sep 01, 2014 at 11:11:37PM +0200, Marc Marí wrote:
> El Mon, 1 Sep 2014 18:27:34 +0200
> Marc Marí <marc.mari.barcelo@gmail.com> escribió:
> > El Mon, 1 Sep 2014 18:09:09 +0200
> > Greg Kurz <gkurz@linux.vnet.ibm.com> escribió:
> > > On Mon,  1 Sep 2014 12:07:58 +0200
> > > Marc Marí <marc.mari.barcelo@gmail.com> wrote:
> > > > Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
> > > > Signed-off-by: Marc Marí <marc.mari.barcelo@gmail.com>
> > > > ---
> > > 
> > > Hi Marc,
> > > 
> > > I gave it a try for various host/target combinations involving ppc64
> > > and x86_64. Here is what I get:
> > > 
> > >         |   x86_64   |    ppc64    | TARGET
> > >         +------------+-------------+--------
> > > x86_64  |     OK     | assert  (1) |
> > > --------+------------+-------------+
> > > ppc64   | assert (2) | assert  (1) |
> > > --------+------------+-------------+
> > > ppc64le |     OK     | assert  (1) |
> > > --------+------------+-------------+
> > >   HOST  |
> > > 
> > > where OK means:
> > > 
> > > /virtio/blk/pci/basic: OK
> > > /virtio/blk/pci/indirect: OK
> > > /virtio/blk/pci/config: OK
> > > /virtio/blk/pci/msix: OK
> > > /virtio/blk/pci/idx: OK
> > > 
> > > and assert (1) is:
> > > 
> > > tests/virtio-blk-test.c:87:virtio_blk_init: assertion failed:
> > > (dev != NULL)
> > > 
> > > and assert (2) is:
> > > 
> > > tests/virtio-blk-test.c:171:pci_basic: assertion failed (status ==
> > > 0): (2 == 0)
> > > 
> > > I will investigate further but the first column in the array ^^
> > > seems to indicate that there's some endianness bug.
> > > 
> > > Cheers.
> > > 
> > > --
> > > Greg
> > 
> > Hi
> > 
> > I will also investigate. Just add that with assert (2), status
> > is 2, which means status is VIRTIO_BLK_S_UNSUPP, which means "request
> > unsupported by host". So, for some reason, ppc64 host does not support
> > a simple write request.
> > 
> > Thanks for your tests
> > Marc
> 
> Hi
> 
> The problem seems to be that it is not implemented. virtio-blk-test is
> now using pci-pc, that has the addresses 0xcf8 and 0xcfc hardcoded.
> These addresses are the key-value for PCI space, to search for devices,
> and I suppose it is specific to i386 and x86_64.
> 
> I also searched information to see how easy it is to add another
> architecture and I could not find much information on ppc64, and even
> less when mixing ppc64 and PCI.

That explains why the ppc64 target column is failing.

But x86 target on ppc64 host should still work.

Stefan

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