Re: [Qemu-devel] [PATCH] virtio-pci: Add subsystem-vendor-id property

["Michael S. Tsirkin" <mst@redhat.com>]

On Tue, Dec 19, 2017 at 09:11:31PM -0800, Ben Warren wrote:
> Hi Michael,
> 
> > On Dec 19, 2017, at 8:27 PM, Michael S. Tsirkin <mst@redhat.com> wrote:
> > 
> > On Wed, Dec 13, 2017 at 12:26:44AM -0800, ben@skyportsystems.com wrote:
> >> From: Ben Warren <ben@skyportsystems.com>
> >> 
> >> Now that virtio-win guest drivers provided by non-Redhat vendors need to
> >> use a different Subsystem Vendor ID value, a way is needed to set this
> >> parameter on the host.  This works with all of the PCI-based devices,
> >> such as NetKVM, viostor, vioscsi, vioserial and balloon.
> >> 
> >> Signed-off-by: Ben Warren <ben@skyportsystems.com>
> > 
> > I applied a related patch by Ladi, pls take a look.
> > 
> If you’re talking about the one titled "virtio-pci: Don't force Subsystem Vendor ID = Vendor ID”, then this is complementary.  If it’s another one, I must have missed it.  The patch I’m aware of doesn’t provide any way of setting the subsystem vendor ID, which is needed.
> 
> BTW - would you prefer this to be contained to virtio-pci, or all of PCI, as another reviewer suggested.  Either is easy.

Let me respond to that one.

> >> ---
> >> hw/virtio/virtio-pci.c | 5 +++++
> >> hw/virtio/virtio-pci.h | 1 +
> >> 2 files changed, 6 insertions(+)
> >> 
> >> diff --git a/hw/virtio/virtio-pci.c b/hw/virtio/virtio-pci.c
> >> index e92837c..b5c86e3 100644
> >> --- a/hw/virtio/virtio-pci.c
> >> +++ b/hw/virtio/virtio-pci.c
> >> @@ -1757,6 +1757,9 @@ static void virtio_pci_realize(PCIDevice *pci_dev, Error **errp)
> >>     if (proxy->disable_legacy == ON_OFF_AUTO_AUTO) {
> >>         proxy->disable_legacy = pcie_port ? ON_OFF_AUTO_ON : ON_OFF_AUTO_OFF;
> >>     }
> >> +    /* Set the PCI Subsystem Vendor ID */
> >> +    k->parent_class.subsystem_vendor_id = proxy->subsystem_vendor_id;
> >> +    pci_set_word(pci_dev->config + PCI_SUBSYSTEM_VENDOR_ID, proxy->subsystem_vendor_id);
> >> 
> >>     if (!virtio_pci_modern(proxy) && !virtio_pci_legacy(proxy)) {
> >>         error_setg(errp, "device cannot work as neither modern nor legacy mode"
> >> @@ -1876,6 +1879,8 @@ static Property virtio_pci_properties[] = {
> >>                     VIRTIO_PCI_FLAG_INIT_LNKCTL_BIT, true),
> >>     DEFINE_PROP_BIT("x-pcie-pm-init", VirtIOPCIProxy, flags,
> >>                     VIRTIO_PCI_FLAG_INIT_PM_BIT, true),
> >> +    DEFINE_PROP_UINT16("subsystem-vendor-id", VirtIOPCIProxy,
> >> +                       subsystem_vendor_id, PCI_VENDOR_ID_REDHAT_QUMRANET),
> >>     DEFINE_PROP_END_OF_LIST(),
> >> };
> >> 
> >> diff --git a/hw/virtio/virtio-pci.h b/hw/virtio/virtio-pci.h
> >> index 12d3a90..8a897ea 100644
> >> --- a/hw/virtio/virtio-pci.h
> >> +++ b/hw/virtio/virtio-pci.h
> >> @@ -186,6 +186,7 @@ struct VirtIOPCIProxy {
> >>     VirtIOIRQFD *vector_irqfd;
> >>     int nvqs_with_notifiers;
> >>     VirtioBusState bus;
> >> +    uint16_t subsystem_vendor_id;
> >> };
> >> 
> >> static inline bool virtio_pci_modern(VirtIOPCIProxy *proxy)
> >> -- 
> >> 2.7.4
>