Re: [PATCH v1 11/17] virtio-pci: Proxy for virtio-mem

[Pankaj Gupta]

> Let's add a proxy for virtio-mem, make it a memory device, and
> pass-through the properties.
>
> Cc: "Michael S. Tsirkin" <address@hidden>
> Cc: Marcel Apfelbaum <address@hidden>
> Cc: "Dr. David Alan Gilbert" <address@hidden>
> Cc: Igor Mammedov <address@hidden>
> Signed-off-by: David Hildenbrand <address@hidden>
> ---
>  hw/virtio/Makefile.objs    |   1 +
>  hw/virtio/virtio-mem-pci.c | 131 +++++++++++++++++++++++++++++++++++++
>  hw/virtio/virtio-mem-pci.h |  33 ++++++++++
>  include/hw/pci/pci.h       |   1 +
>  4 files changed, 166 insertions(+)
>  create mode 100644 hw/virtio/virtio-mem-pci.c
>  create mode 100644 hw/virtio/virtio-mem-pci.h
>
> diff --git a/hw/virtio/Makefile.objs b/hw/virtio/Makefile.objs
> index 7df70e977e..b9661f9c01 100644
> --- a/hw/virtio/Makefile.objs
> +++ b/hw/virtio/Makefile.objs
> @@ -19,6 +19,7 @@ obj-$(call 
> land,$(CONFIG_VHOST_USER_FS),$(CONFIG_VIRTIO_PCI)) += vhost-user-fs-p
>  obj-$(CONFIG_VIRTIO_IOMMU) += virtio-iommu.o
>  obj-$(CONFIG_VHOST_VSOCK) += vhost-vsock.o
>  obj-$(CONFIG_VIRTIO_MEM) += virtio-mem.o
> +common-obj-$(call land,$(CONFIG_VIRTIO_MEM),$(CONFIG_VIRTIO_PCI)) += 
> virtio-mem-pci.o
>
>  ifeq ($(CONFIG_VIRTIO_PCI),y)
>  obj-$(CONFIG_VHOST_VSOCK) += vhost-vsock-pci.o
> diff --git a/hw/virtio/virtio-mem-pci.c b/hw/virtio/virtio-mem-pci.c
> new file mode 100644
> index 0000000000..a47d21c81f
> --- /dev/null
> +++ b/hw/virtio/virtio-mem-pci.c
> @@ -0,0 +1,131 @@
> +/*
> + * Virtio MEM PCI device
> + *
> + * Copyright (C) 2020 Red Hat, Inc.
> + *
> + * Authors:
> + *  David Hildenbrand <address@hidden>
> + *
> + * This work is licensed under the terms of the GNU GPL, version 2.
> + * See the COPYING file in the top-level directory.
> + */
> +
> +#include "qemu/osdep.h"
> +
Don't think we need the blank line here.

> +#include "virtio-mem-pci.h"
> +#include "hw/mem/memory-device.h"
> +#include "qapi/error.h"
> +
> +static void virtio_mem_pci_realize(VirtIOPCIProxy *vpci_dev, Error **errp)
> +{
> +    VirtIOMEMPCI *mem_pci = VIRTIO_MEM_PCI(vpci_dev);
> +    DeviceState *vdev = DEVICE(&mem_pci->vdev);
> +
> +    qdev_set_parent_bus(vdev, BUS(&vpci_dev->bus));
> +    object_property_set_bool(OBJECT(vdev), true, "realized", errp);
> +}
> +
> +static void virtio_mem_pci_set_addr(MemoryDeviceState *md, uint64_t addr,
> +                                    Error **errp)
> +{
> +    object_property_set_uint(OBJECT(md), addr, VIRTIO_MEM_ADDR_PROP, errp);
> +}
> +
> +static uint64_t virtio_mem_pci_get_addr(const MemoryDeviceState *md)
> +{
> +    return object_property_get_uint(OBJECT(md), VIRTIO_MEM_ADDR_PROP,
> +                                    &error_abort);
> +}
> +
> +static MemoryRegion *virtio_mem_pci_get_memory_region(MemoryDeviceState *md,
> +                                                      Error **errp)
> +{
> +    VirtIOMEMPCI *pci_mem = VIRTIO_MEM_PCI(md);
> +    VirtIOMEM *vmem = VIRTIO_MEM(&pci_mem->vdev);
> +    VirtIOMEMClass *vmc = VIRTIO_MEM_GET_CLASS(vmem);
> +
> +    return vmc->get_memory_region(vmem, errp);
> +}
> +
> +static uint64_t virtio_mem_pci_get_plugged_size(const MemoryDeviceState *md,
> +                                                Error **errp)
> +{
> +    return object_property_get_uint(OBJECT(md), VIRTIO_MEM_SIZE_PROP,
> +                                    errp);
> +}
> +
> +static void virtio_mem_pci_fill_device_info(const MemoryDeviceState *md,
> +                                            MemoryDeviceInfo *info)
> +{
> +    VirtioMEMDeviceInfo *vi = g_new0(VirtioMEMDeviceInfo, 1);
> +    VirtIOMEMPCI *pci_mem = VIRTIO_MEM_PCI(md);
> +    VirtIOMEM *vmem = VIRTIO_MEM(&pci_mem->vdev);
> +    VirtIOMEMClass *vpc = VIRTIO_MEM_GET_CLASS(vmem);
> +    DeviceState *dev = DEVICE(md);
> +
> +    if (dev->id) {
> +        vi->has_id = true;
> +        vi->id = g_strdup(dev->id);
> +    }
> +
> +    /* let the real device handle everything else */
> +    vpc->fill_device_info(vmem, vi);
> +
> +    info->u.virtio_mem.data = vi;
> +    info->type = MEMORY_DEVICE_INFO_KIND_VIRTIO_MEM;
> +}
> +
> +static void virtio_mem_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);
> +    MemoryDeviceClass *mdc = MEMORY_DEVICE_CLASS(klass);
> +
> +    k->realize = virtio_mem_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_MEM;
> +    pcidev_k->revision = VIRTIO_PCI_ABI_VERSION;
> +    pcidev_k->class_id = PCI_CLASS_OTHERS;
> +
> +    mdc->get_addr = virtio_mem_pci_get_addr;
> +    mdc->set_addr = virtio_mem_pci_set_addr;
> +    mdc->get_plugged_size = virtio_mem_pci_get_plugged_size;
> +    mdc->get_memory_region = virtio_mem_pci_get_memory_region;
> +    mdc->fill_device_info = virtio_mem_pci_fill_device_info;
> +}
> +
> +static void virtio_mem_pci_instance_init(Object *obj)
> +{
> +    VirtIOMEMPCI *dev = VIRTIO_MEM_PCI(obj);
> +
> +    virtio_instance_init_common(obj, &dev->vdev, sizeof(dev->vdev),
> +                                TYPE_VIRTIO_MEM);
> +    object_property_add_alias(obj, VIRTIO_MEM_BLOCK_SIZE_PROP,
> +                              OBJECT(&dev->vdev),
> +                              VIRTIO_MEM_BLOCK_SIZE_PROP, &error_abort);
> +    object_property_add_alias(obj, VIRTIO_MEM_SIZE_PROP, OBJECT(&dev->vdev),
> +                              VIRTIO_MEM_SIZE_PROP, &error_abort);
> +    object_property_add_alias(obj, VIRTIO_MEM_REQUESTED_SIZE_PROP,
> +                              OBJECT(&dev->vdev),
> +                              VIRTIO_MEM_REQUESTED_SIZE_PROP, &error_abort);
> +}
> +
> +static const VirtioPCIDeviceTypeInfo virtio_mem_pci_info = {
> +    .base_name = TYPE_VIRTIO_MEM_PCI,
> +    .generic_name = "virtio-mem-pci",
> +    .instance_size = sizeof(VirtIOMEMPCI),
> +    .instance_init = virtio_mem_pci_instance_init,
> +    .class_init = virtio_mem_pci_class_init,
> +    .interfaces = (InterfaceInfo[]) {
> +        { TYPE_MEMORY_DEVICE },
> +        { }
> +    },
> +};
> +
> +static void virtio_mem_pci_register_types(void)
> +{
> +    virtio_pci_types_register(&virtio_mem_pci_info);
> +}
> +type_init(virtio_mem_pci_register_types)
> diff --git a/hw/virtio/virtio-mem-pci.h b/hw/virtio/virtio-mem-pci.h
> new file mode 100644
> index 0000000000..8820cd6628
> --- /dev/null
> +++ b/hw/virtio/virtio-mem-pci.h
> @@ -0,0 +1,33 @@
> +/*
> + * Virtio MEM PCI device
> + *
> + * Copyright (C) 2020 Red Hat, Inc.
> + *
> + * Authors:
> + *  David Hildenbrand <address@hidden>
> + *
> + * This work is licensed under the terms of the GNU GPL, version 2.
> + * See the COPYING file in the top-level directory.
> + */
> +
> +#ifndef QEMU_VIRTIO_MEM_PCI_H
> +#define QEMU_VIRTIO_MEM_PCI_H
> +
> +#include "hw/virtio/virtio-pci.h"
> +#include "hw/virtio/virtio-mem.h"
> +
> +typedef struct VirtIOMEMPCI VirtIOMEMPCI;
> +
> +/*
> + * virtio-mem-pci: This extends VirtioPCIProxy.
> + */
> +#define TYPE_VIRTIO_MEM_PCI "virtio-mem-pci-base"
> +#define VIRTIO_MEM_PCI(obj) \
> +        OBJECT_CHECK(VirtIOMEMPCI, (obj), TYPE_VIRTIO_MEM_PCI)
> +
> +struct VirtIOMEMPCI {
> +    VirtIOPCIProxy parent_obj;
> +    VirtIOMEM vdev;
> +};
> +
> +#endif /* QEMU_VIRTIO_MEM_PCI_H */
> diff --git a/include/hw/pci/pci.h b/include/hw/pci/pci.h
> index cfedf5a995..fec72d5a31 100644
> --- a/include/hw/pci/pci.h
> +++ b/include/hw/pci/pci.h
> @@ -87,6 +87,7 @@ extern bool pci_available;
>  #define PCI_DEVICE_ID_VIRTIO_VSOCK       0x1012
>  #define PCI_DEVICE_ID_VIRTIO_PMEM        0x1013
>  #define PCI_DEVICE_ID_VIRTIO_IOMMU       0x1014
> +#define PCI_DEVICE_ID_VIRTIO_MEM         0x1015
>
>  #define PCI_VENDOR_ID_REDHAT             0x1b36
>  #define PCI_DEVICE_ID_REDHAT_BRIDGE      0x0001
> --
> 2.25.3
Reviewed-by: Pankaj Gupta <address@hidden>