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Re: [Qemu-devel] [PATCH v2] virtio-pci: error out when both legacy and m
From: |
Greg Kurz |
Subject: |
Re: [Qemu-devel] [PATCH v2] virtio-pci: error out when both legacy and modern modes are disabled |
Date: |
Thu, 21 Jul 2016 19:02:39 +0200 |
On Thu, 21 Jul 2016 19:52:28 +0300
Marcel Apfelbaum <address@hidden> wrote:
> On 07/21/2016 06:52 PM, Greg Kurz wrote:
> > From: Greg Kurz <address@hidden>
> >
> > Without presuming if we got there because of a user mistake or some
> > more subtle bug in the tooling, it really does not make sense to
> > implement a non-functional device.
> >
> > Signed-off-by: Greg Kurz <address@hidden>
> > Signed-off-by: Greg Kurz <address@hidden>
> > ---
> > v2: - error out at realize time as suggested by Connie
> > - updated title and changelog
> > ---
> > hw/virtio/virtio-pci.c | 6 ++++++
> > 1 file changed, 6 insertions(+)
> >
> > diff --git a/hw/virtio/virtio-pci.c b/hw/virtio/virtio-pci.c
> > index f0677b73d860..8d707aac0c21 100644
> > --- a/hw/virtio/virtio-pci.c
> > +++ b/hw/virtio/virtio-pci.c
> > @@ -1838,6 +1838,12 @@ static void virtio_pci_dc_realize(DeviceState *qdev,
> > Error **errp)
> > VirtIOPCIProxy *proxy = VIRTIO_PCI(qdev);
> > PCIDevice *pci_dev = &proxy->pci_dev;
> >
> > + if (proxy->flags & VIRTIO_PCI_FLAG_DISABLE_LEGACY &&
> > + proxy->flags & VIRTIO_PCI_FLAG_DISABLE_MODERN) {
> > + error_setg(errp, "device is unserviceable when both legacy and
> > modern modes are disabled. At least one of the disable-modern or
> > disable-legacy properties should be set to false.");
> > + return;
> > + }
> > +
>
> Hi Greg,
>
> I agree with the patch, but other patch in the mailing list
> replaces the flags with standalone fields:
>
> https://lists.gnu.org/archive/html/qemu-devel/2016-07/msg04744.html
>
v3 will be using virtio_pci_legacy() and virtio_pci_modern().
> Also the error line may be too long and need to be truncated.
>
I'll rephrase the message. BTW is there a formal limit for the length
of error lines ? 80 chars ?
> Thanks,
> Marcel
>
> > if (!(proxy->flags & VIRTIO_PCI_FLAG_DISABLE_PCIE) &&
> > !(proxy->flags & VIRTIO_PCI_FLAG_DISABLE_MODERN)) {
> > pci_dev->cap_present |= QEMU_PCI_CAP_EXPRESS;
> >
> >
>