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Date: Thu, 19 Nov 2015 22:43:04 +0200
From: "Michael S. Tsirkin" <mst@redhat.com>
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Subject: Re: [Qemu-devel] [PULL 08/15] i440fx: print an error message if
 user tries to enable iommu
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To: Bandan Das <bsd@redhat.com>
Cc: Peter Maydell <peter.maydell@linaro.org>, Markus Armbruster <armbru@redhat.com>, qemu-devel@nongnu.org

On Thu, Nov 19, 2015 at 03:38:03PM -0500, Bandan Das wrote:
> "Michael S. Tsirkin" <mst@redhat.com> writes:
> 
> > From: Bandan Das <bsd@redhat.com>
> >
> > There's no indication of any sort that i440fx doesn't support
> > "iommu=on"
> 
> Oh, Markus quite didn't like this approach because this is
> true for all other machines too. Anyway, I will keep in
> mind to take care of this when I post a generic patch. 

Do you think I should revert this one then?

> > Reviewed-by: Eric Blake <eblake@redhat.com>
> > Signed-off-by: Bandan Das <bsd@redhat.com>
> > Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
> > Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
> > Reviewed-by: Eric Blake <eblake@redhat.com>
> > Signed-off-by: Bandan Das <bsd@redhat.com>
> > ---
> >  hw/pci-host/piix.c | 5 +++++
> >  1 file changed, 5 insertions(+)
> >
> > diff --git a/hw/pci-host/piix.c b/hw/pci-host/piix.c
> > index 7b2fbf9..715208b 100644
> > --- a/hw/pci-host/piix.c
> > +++ b/hw/pci-host/piix.c
> > @@ -34,6 +34,7 @@
> >  #include "sysemu/sysemu.h"
> >  #include "hw/i386/ioapic.h"
> >  #include "qapi/visitor.h"
> > +#include "qemu/error-report.h"
> >  
> >  /*
> >   * I440FX chipset data sheet.
> > @@ -301,6 +302,10 @@ static void i440fx_pcihost_realize(DeviceState *dev, Error **errp)
> >  static void i440fx_realize(PCIDevice *dev, Error **errp)
> >  {
> >      dev->config[I440FX_SMRAM] = 0x02;
> > +
> > +    if (object_property_get_bool(qdev_get_machine(), "iommu", NULL)) {
> > +        error_report("warning: i440fx doesn't support emulated iommu");
> > +    }
> >  }
> >  
> >  PCIBus *i440fx_init(const char *host_type, const char *pci_type,