Hi David,
> > This patch adds virtio-pmem Qemu device.
> >
> > This device configures memory address range information with file
> > backend type. It acts like persistent memory device for KVM guest.
> > It presents the memory address range to virtio-pmem driver over
> > virtio channel and does the block flush whenever there is request
> > from guest to flush/sync. (Qemu part for backing file flush
> > is yet to be implemented).
> >
> > Current code is a RFC to support guest with persistent memory
> > range & DAX.
> >
> > Signed-off-by: Pankaj Gupta
> > ---
> > hw/virtio/Makefile.objs | 2 +-
> > hw/virtio/virtio-pci.c | 44 +
> > hw/virtio/virtio-pci.h | 14 +++
> > hw/virtio/virtio-pmem.c | 133
> >
> > include/hw/pci/pci.h| 1 +
> > include/hw/virtio/virtio-pmem.h | 43 +
> > include/standard-headers/linux/virtio_ids.h | 1 +
> > 7 files changed, 237 insertions(+), 1 deletion(-)
> > create mode 100644 hw/virtio/virtio-pmem.c
> > create mode 100644 include/hw/virtio/virtio-pmem.h
> >
> > diff --git a/hw/virtio/Makefile.objs b/hw/virtio/Makefile.objs
> > index 765d363c1f..bb5573d2ef 100644
> > --- a/hw/virtio/Makefile.objs
> > +++ b/hw/virtio/Makefile.objs
> > @@ -5,7 +5,7 @@ common-obj-y += virtio-bus.o
> > common-obj-y += virtio-mmio.o
> >
> > obj-y += virtio.o virtio-balloon.o
> > -obj-$(CONFIG_LINUX) += vhost.o vhost-backend.o vhost-user.o
> > +obj-$(CONFIG_LINUX) += vhost.o vhost-backend.o vhost-user.o virtio-pmem.o
> > obj-$(CONFIG_VHOST_VSOCK) += vhost-vsock.o
> > obj-y += virtio-crypto.o
> > obj-$(CONFIG_VIRTIO_PCI) += virtio-crypto-pci.o
> > diff --git a/hw/virtio/virtio-pci.c b/hw/virtio/virtio-pci.c
> > index c20537f31d..114ca05497 100644
> > --- a/hw/virtio/virtio-pci.c
> > +++ b/hw/virtio/virtio-pci.c
> > @@ -2491,6 +2491,49 @@ static const TypeInfo virtio_rng_pci_info = {
> > .class_init= virtio_rng_pci_class_init,
> > };
> >
> > +/* virtio-pmem-pci */
> > +
> > +static void virtio_pmem_pci_realize(VirtIOPCIProxy *vpci_dev, Error
> > **errp)
> > +{
> > +VirtIOPMEMPCI *vpmem = VIRTIO_PMEM_PCI(vpci_dev);
> > +DeviceState *vdev = DEVICE(&vpmem->vdev);
> > +
> > +qdev_set_parent_bus(vdev, BUS(&vpci_dev->bus));
> > +object_property_set_bool(OBJECT(vdev), true, "realized", errp);
> > +}
> > +
> > +static void virtio_pmem_pci_class_init(ObjectClass *klass, void *data)
> > +{
> > +DeviceClass *dc = DEVICE_CLASS(klass);
> > +VirtioPCIClass *k = VIRTIO_PCI_CLASS(klass);
> > +PCIDeviceClass *pcidev_k = PCI_DEVICE_CLASS(klass);
> > +k->realize = virtio_pmem_pci_realize;
> > +set_bit(DEVICE_CATEGORY_MISC, dc->categories);
> > +pcidev_k->vendor_id = PCI_VENDOR_ID_REDHAT_QUMRANET;
> > +pcidev_k->device_id = PCI_DEVICE_ID_VIRTIO_PMEM;
> > +pcidev_k->revision = VIRTIO_PCI_ABI_VERSION;
> > +pcidev_k->class_id = PCI_CLASS_OTHERS;
> > +}
> > +
> > +static void virtio_pmem_pci_instance_init(Object *obj)
> > +{
> > +VirtIOPMEMPCI *dev = VIRTIO_PMEM_PCI(obj);
> > +
> > +virtio_instance_init_common(obj, &dev->vdev, sizeof(dev->vdev),
> > +TYPE_VIRTIO_PMEM);
> > +object_property_add_alias(obj, "memdev", OBJECT(&dev->vdev), "memdev",
> > + &error_abort);
> > +}
> > +
> > +static const TypeInfo virtio_pmem_pci_info = {
> > +.name = TYPE_VIRTIO_PMEM_PCI,
> > +.parent= TYPE_VIRTIO_PCI,
> > +.instance_size = sizeof(VirtIOPMEMPCI),
> > +.instance_init = virtio_pmem_pci_instance_init,
> > +.class_init= virtio_pmem_pci_class_init,
> > +};
> > +
> > +
> > /* virtio-input-pci */
> >
> > static Property virtio_input_pci_properties[] = {
> > @@ -2683,6 +2726,7 @@ static void virtio_pci_register_types(void)
> > type_register_static(&virtio_balloon_pci_info);
> > type_register_static(&virtio_serial_pci_info);
> > type_register_static(&virtio_net_pci_info);
> > +type_register_static(&virtio_pmem_pci_info);
> > #ifdef CONFIG_VHOST_SCSI
> > type_register_static(&vhost_scsi_pci_info);
> > #endif
> > diff --git a/hw/virtio/virtio-pci.h b/hw/virtio/virtio-pci.h
> > index 813082b0d7..fe74fcad3f 100644
> > --- a/hw/virtio/virtio-pci.h
> > +++ b/hw/virtio/virtio-pci.h
> > @@ -19,6 +19,7 @@
> > #include "hw/virtio/virtio-blk.h"
> > #include "hw/virtio/virtio-net.h"
> > #include "hw/virtio/virtio-rng.h"
> > +#include "hw/virtio/virtio-pmem.h"
> > #include "hw/virtio/virtio-serial.h"
> > #include "hw/virtio/virtio-scsi.h"
> > #include "hw/virtio/virtio-balloon.h"
> > @@ -57,6 +58,7 @@ typedef struct VirtIOInputHostPCI VirtIOInputHostPCI;
> > typedef struct VirtIOGPUPCI VirtIOGPUPCI;
> > typedef struct VHostVSockPCI VHostVSockPCI;
> > typedef struct VirtIOCryptoPCI VirtIOCryptoPCI;
> > +typedef struct VirtIOPMEMPCI VirtIOPMEMPCI;
> >
