Re: [libvirt] [PATCH for-4.0 v2] virtio: Provide version-specific variants of virtio PCI devices

diff --git a/hw/virtio/virtio-pci.h b/hw/virtio/virtio-pci.h index 813082b0d7..1d2a11504f 100644 --- a/hw/virtio/virtio-pci.h +++ b/hw/virtio/virtio-pci.h

+/** + * VirtioPCIDeviceTypeInfo: + * + * Template for virtio PCI device types. See virtio_pci_types_register() + * for details. + */ +typedef struct VirtioPCIDeviceTypeInfo { + /* Prefix for the class names */ + const char *name_prefix;

+ /* Parent type. If NULL, TYPE_VIRTIO_PCI is used */ + const char *parent; + /* If modern_only is true, only <name_prefix> type will be registered */ + bool modern_only; + + /* Same as TypeInfo fields: */ + size_t instance_size; + void (*instance_init)(Object *obj); + void (*class_init)(ObjectClass *klass, void *data); +} VirtioPCIDeviceTypeInfo; + +/* + * Register virtio-pci types. Each virtio-pci device type will be available + * in 3 flavors: + * - <prefix>-transitional: modern device supporting legacy drivers + * - Supports Conventional PCI buses only + * - <prefix>-non-transitional: modern-only + * - Supports Conventional PCI and PCI Express buses + * - <prefix>: virtio version configurable, legacy driver support + * automatically selected when device is plugged + * _ This was the only flavor supported until QEMU 3.1

+ * - Supports Conventional PCI and PCI Express buses + * + * All the types above will inherit from "<prefix>-base", so generic + * code can use "<prefix>-base" on type casts. + * + * We need a separate "<prefix>-base" type instead of making all types inherit + * from <prefix> for two reasons: + * 1) <prefix> will implement INTERFACE_PCIE_DEVICE, but + * <prefix>-transitional won't. + * 2) <prefix> will have the "disable-legacy" and "disable-modern" properties, + * <prefix>-transitional and <prefix>-non-transitional won't.

+ */ +void virtio_pci_types_register(const VirtioPCIDeviceTypeInfo *t); + #endif

diff --git a/hw/virtio/virtio-pci.c b/hw/virtio/virtio-pci.c index a954799267..0fa248d68c 100644 --- a/hw/virtio/virtio-pci.c +++ b/hw/virtio/virtio-pci.c

+static void virtio_pci_1_0_instance_init(Object *obj)

+{ + VirtIOPCIProxy *proxy = VIRTIO_PCI(obj); + + proxy->disable_legacy = ON_OFF_AUTO_ON; + proxy->disable_modern = false; +}