Re: [Qemu-devel] [PATCH v4 2/2] hw/pci: fixed hotplug crash when using rombar=0 with devices having romfile

[Marcel Apfelbaum <marcel.a@redhat.com>]

On Mon, 2014-11-03 at 13:03 +0100, Markus Armbruster wrote:
> Marcel Apfelbaum <marcel.a@redhat.com> writes:
> 
> > Hot-plugging a device that has a romfile (either supplied by user
> > or built-in) using rombar=0 option is a user error,
> > do not allow the device to be hot-plugged.
> >
> > Reviewed-by: Eric Blake <eblake@redhat.com>
> > Signed-off-by: Marcel Apfelbaum <marcel.a@redhat.com>
> > ---
> >  hw/pci/pci.c | 9 +++++++++
> >  1 file changed, 9 insertions(+)
> >
> > diff --git a/hw/pci/pci.c b/hw/pci/pci.c
> > index 36226eb..371699c 100644
> > --- a/hw/pci/pci.c
> > +++ b/hw/pci/pci.c
> > @@ -1942,6 +1942,15 @@ static int pci_add_option_rom(PCIDevice *pdev, bool is_default_rom)
> >           * for 0.11 compatibility.
> >           */
> >          int class = pci_get_word(pdev->config + PCI_CLASS_DEVICE);
> > +
> > +        /*
> > +         * Hot-plugged devices can't use the option ROM
> > +         * if the rom bar is disabled.
> > +         */
> > +        if (DEVICE(pdev)->hotplugged) {
> > +            return -1;
> > +        }
> > +
> >          if (class == 0x0300) {
> >              rom_add_vga(pdev->romfile);
> >          } else {
> 
> Unlike the function's other unsuccessful returns, this one is silent.
> Intentional?
Yes, the first version included an error message, but was not accepted
as the reviewers preferred "silent drop" instead.
The main reason was that a proper error propagation mechanism
should be used.
At the time of the patch there was not such an option, but now there is.
I can add it on top of your series, preferably after is merged.

Thanks,
Marcel