Re: [Qemu-devel] [PATCH v2 4/7] virtio-pci: Proxy for virtio-pmem

[Pankaj Gupta <pagupta@redhat.com>]

> 
> On Tue, Jul 02, 2019 at 01:55:19PM +0200, Cornelia Huck wrote:
> > On Wed, 19 Jun 2019 15:19:04 +0530
> > Pankaj Gupta <pagupta@redhat.com> wrote:
> > 
> > > We need a proxy device for virtio-pmem, and this device has to be the
> > > actual memory device so we can cleanly hotplug it.
> > > 
> > > Forward memory device class functions either to the actual device or use
> > > properties of the virtio-pmem device to implement these in the proxy.
> > > 
> > > virtio-pmem will only be compiled for selected, supported architectures
> > > (that can deal with virtio/pci devices being memory devices). An
> > > architecture that is prepared for that can simply enable
> > > CONFIG_VIRTIO_PMEM to make it work.
> > > 
> > > As not all architectures support memory devices (and CONFIG_VIRTIO_PMEM
> > > will be enabled per supported architecture), we have to move the PCI
> > > proxy
> > > to a separate file.
> > > 
> > > Signed-off-by: Pankaj Gupta <pagupta@redhat.com>
> > > [ split up patches, memory-device changes, move pci proxy]
> > > Signed-off-by: David Hildenbrand <david@redhat.com>
> > > ---
> > >  hw/virtio/Makefile.objs     |   1 +
> > >  hw/virtio/virtio-pmem-pci.c | 131
> > >  ++++++++++++++++++++++++++++++++++++++++++++
> > >  hw/virtio/virtio-pmem-pci.h |  34 ++++++++++++
> > >  include/hw/pci/pci.h        |   1 +
> > >  4 files changed, 167 insertions(+)
> > >  create mode 100644 hw/virtio/virtio-pmem-pci.c
> > >  create mode 100644 hw/virtio/virtio-pmem-pci.h
> > 
> > (...)
> > 
> > > +static const VirtioPCIDeviceTypeInfo virtio_pmem_pci_info = {
> > > +    .base_name             = TYPE_VIRTIO_PMEM_PCI,
> > > +    .generic_name          = "virtio-pmem-pci",
> > > +    .transitional_name     = "virtio-pmem-pci-transitional",
> > 
> > Do we even have a transitional device for this? I.e., do we have a
> > legacy version? I don't think that makes sense for new devices.
> 
> 
> I agree - I applied so pls send a patch on top.
> Or if you end up having to respin pls include this.

Sure. Thank you!

> 
> > > +    .non_transitional_name = "virtio-pmem-pci-non-transitional",
> 
> Neither do we need a non transitional name.

o.k

Best regards,
Pankaj
> 
> > > +    .instance_size = sizeof(VirtIOPMEMPCI),
> > > +    .instance_init = virtio_pmem_pci_instance_init,
> > > +    .class_init    = virtio_pmem_pci_class_init,
> > > +    .interfaces = (InterfaceInfo[]) {
> > > +        { TYPE_MEMORY_DEVICE },
> > > +        { }
> > > +    },
> > > +};
> > 
> > (...)
>