RE: [PATCH net-next, 2/6] PCI: hv: Add a Hyper-V PCI mini driver for software backchannel interface

Haiyang Zhang
2019-08-16T19:50:20Z

> -----Original Message-----
> From: Vitaly Kuznetsov <vkuznets@redhat.com>
> Sent: Friday, August 16, 2019 12:16 PM
> To: Haiyang Zhang <haiyangz@microsoft.com>
> Cc: KY Srinivasan <kys@microsoft.com>; Stephen Hemminger
> <sthemmin@microsoft.com>; linux-kernel@vger.kernel.org;
> sashal@kernel.org; davem@davemloft.net; saeedm@mellanox.com;
> leon@kernel.org; eranbe@mellanox.com; lorenzo.pieralisi@arm.com;
> bhelgaas@google.com; linux-pci@vger.kernel.org; linux-
> hyperv@vger.kernel.org; netdev@vger.kernel.org
> Subject: RE: [PATCH net-next, 2/6] PCI: hv: Add a Hyper-V PCI mini driver for
> software backchannel interface
>
> Haiyang Zhang <haiyangz@microsoft.com> writes:
>
> >
> > The pci_hyperv can only be loaded on VMs on Hyper-V and Azure. Other
> > drivers like MLX5e will have symbolic dependency of pci_hyperv if they
> > use functions exported by pci_hyperv. This dependency will cause other
> > drivers fail to load on other platforms, like VMs on KVM. So we
> > created this mini driver, which can be loaded on any platforms to
> > provide the symbolic dependency.
>
> (/me wondering is there a nicer way around this, by using __weak or
> something like that...)
>
> In case this stub is the best solution I'd suggest to rename it to something like
> PCI_HYPERV_INTERFACE to make it clear it is not a separate driver (_MINI
> makes me think so).

Thanks! I will consider those options.