> -----Original Message-----
> From: Jason Wang [mailto:jasow...@redhat.com]
> Sent: Wednesday, January 5, 2022 12:38 PM
> To: Longpeng (Mike, Cloud Infrastructure Service Product Dept.)
> <longpe...@huawei.com>
> Cc: Stefan Hajnoczi <stefa...@redhat.com>; mst <m...@redhat.com>; Stefano
> Garzarella <sgarz...@redhat.com>; Cornelia Huck <coh...@redhat.com>; pbonzini
> <pbonz...@redhat.com>; Gonglei (Arei) <arei.gong...@huawei.com>; Yechuan
> <yech...@huawei.com>; Huangzhichao <huangzhic...@huawei.com>; qemu-devel
> <qemu-devel@nongnu.org>
> Subject: Re: [RFC 01/10] virtio: get class_id and pci device id by the virtio
> id
>
> On Wed, Jan 5, 2022 at 8:59 AM Longpeng(Mike) <longpe...@huawei.com> wrote:
> >
> > From: Longpeng <longpe...@huawei.com>
> >
> > Add helpers to get the "Transitional PCI Device ID" and "class_id" of the
> > deivce which is specificed by the "Virtio Device ID".
> >
> > These helpers will be used to build the generic vDPA device later.
> >
> > Signed-off-by: Longpeng <longpe...@huawei.com>
> > ---
> > hw/virtio/virtio-pci.c | 93 ++++++++++++++++++++++++++++++++++++++++++
> > hw/virtio/virtio-pci.h | 4 ++
> > 2 files changed, 97 insertions(+)
> >
> > diff --git a/hw/virtio/virtio-pci.c b/hw/virtio/virtio-pci.c
> > index 750aa47ec1..843085c4ea 100644
> > --- a/hw/virtio/virtio-pci.c
> > +++ b/hw/virtio/virtio-pci.c
> > @@ -19,6 +19,7 @@
> >
> > #include "exec/memop.h"
> > #include "standard-headers/linux/virtio_pci.h"
> > +#include "standard-headers/linux/virtio_ids.h"
> > #include "hw/boards.h"
> > #include "hw/virtio/virtio.h"
> > #include "migration/qemu-file-types.h"
> > @@ -213,6 +214,95 @@ static int virtio_pci_load_queue(DeviceState *d, int n,
> QEMUFile *f)
> > return 0;
> > }
> >
> > +typedef struct VirtIOPCIIDInfo {
> > + uint16_t vdev_id; /* virtio id */
> > + uint16_t pdev_id; /* pci device id */
> > + uint16_t class_id;
> > +} VirtIOPCIIDInfo;
> > +
> > +static const VirtIOPCIIDInfo virtio_pci_id_info[] = {
> > + {
>
> Any way to get rid of this array? E.g using the algorithm that is used
> by the kernel virtio driver.
>
For device id, we can use the algorithm if we no need to support
Transitional id. But how to get the class id ?
> Thanks
>
> > + .vdev_id = VIRTIO_ID_NET,
> > + .pdev_id = PCI_DEVICE_ID_VIRTIO_NET,
> > + .class_id = PCI_CLASS_NETWORK_ETHERNET,
> > + },
> > + {
> > + .vdev_id = VIRTIO_ID_BLOCK,
> > + .pdev_id = PCI_DEVICE_ID_VIRTIO_BLOCK,
> > + .class_id = PCI_CLASS_STORAGE_SCSI,
> > + },
> > + {
> > + .vdev_id = VIRTIO_ID_CONSOLE,
> > + .pdev_id = PCI_DEVICE_ID_VIRTIO_CONSOLE,
> > + .class_id = PCI_CLASS_COMMUNICATION_OTHER,
> > + },
> > + {
> > + .vdev_id = VIRTIO_ID_SCSI,
> > + .pdev_id = PCI_DEVICE_ID_VIRTIO_SCSI,
> > + .class_id = PCI_CLASS_STORAGE_SCSI,
> > + },
> > + {
> > + .vdev_id = VIRTIO_ID_9P,
> > + .pdev_id = PCI_DEVICE_ID_VIRTIO_9P,
> > + .class_id = PCI_BASE_CLASS_NETWORK,
> > + },
> > + {
> > + .vdev_id = VIRTIO_ID_VSOCK,
> > + .pdev_id = PCI_DEVICE_ID_VIRTIO_VSOCK,
> > + .class_id = PCI_CLASS_COMMUNICATION_OTHER,
> > + },
> > + {
> > + .vdev_id = VIRTIO_ID_IOMMU,
> > + .pdev_id = PCI_DEVICE_ID_VIRTIO_IOMMU,
> > + .class_id = PCI_CLASS_OTHERS,
> > + },
> > + {
> > + .vdev_id = VIRTIO_ID_MEM,
> > + .pdev_id = PCI_DEVICE_ID_VIRTIO_MEM,
> > + .class_id = PCI_CLASS_OTHERS,
> > + },
> > + {
> > + .vdev_id = VIRTIO_ID_PMEM,
> > + .pdev_id = PCI_DEVICE_ID_VIRTIO_PMEM,
> > + .class_id = PCI_CLASS_OTHERS,
> > + },
> > + {
> > + .vdev_id = VIRTIO_ID_RNG,
> > + .pdev_id = PCI_DEVICE_ID_VIRTIO_RNG,
> > + .class_id = PCI_CLASS_OTHERS,
> > + },
> > + {
> > + .vdev_id = VIRTIO_ID_BALLOON,
> > + .pdev_id = PCI_DEVICE_ID_VIRTIO_BALLOON,
> > + .class_id = PCI_CLASS_OTHERS,
> > + },
> > +};
> > +
> > +static VirtIOPCIIDInfo virtio_pci_get_id_info(uint16_t vdev_id)
> > +{
> > + VirtIOPCIIDInfo info = {};
> > + int i;
> > +
> > + for (i = 0; i < ARRAY_SIZE(virtio_pci_id_info); i++) {
> > + if (virtio_pci_id_info[i].vdev_id == vdev_id) {
> > + info = virtio_pci_id_info[i];
> > + break;
> > + }
> > + }
> > +
> > + return info;
> > +}
> > +
> > +uint16_t virtio_pci_get_pci_devid(uint16_t device_id)
> > +{
> > + return virtio_pci_get_id_info(device_id).pdev_id;
> > +}
> > +
> > +uint16_t virtio_pci_get_class_id(uint16_t device_id)
> > +{
> > + return virtio_pci_get_id_info(device_id).class_id;
> > +}
> > +
> > static bool virtio_pci_ioeventfd_enabled(DeviceState *d)
> > {
> > VirtIOPCIProxy *proxy = to_virtio_pci_proxy(d);
> > @@ -1674,6 +1764,9 @@ static void virtio_pci_device_plugged(DeviceState *d,
> Error **errp)
> > * is set to PCI_SUBVENDOR_ID_REDHAT_QUMRANET by default.
> > */
> > pci_set_word(config + PCI_SUBSYSTEM_ID,
> virtio_bus_get_vdev_id(bus));
> > + if (proxy->pdev_id) {
> > + pci_config_set_device_id(config, proxy->pdev_id);
> > + }
> > } else {
> > /* pure virtio-1.0 */
> > pci_set_word(config + PCI_VENDOR_ID,
> > diff --git a/hw/virtio/virtio-pci.h b/hw/virtio/virtio-pci.h
> > index 2446dcd9ae..06aa59436e 100644
> > --- a/hw/virtio/virtio-pci.h
> > +++ b/hw/virtio/virtio-pci.h
> > @@ -146,6 +146,7 @@ struct VirtIOPCIProxy {
> > bool disable_modern;
> > bool ignore_backend_features;
> > OnOffAuto disable_legacy;
> > + uint16_t pdev_id;
> > uint32_t class_code;
> > uint32_t nvectors;
> > uint32_t dfselect;
> > @@ -158,6 +159,9 @@ struct VirtIOPCIProxy {
> > VirtioBusState bus;
> > };
> >
> > +uint16_t virtio_pci_get_pci_devid(uint16_t device_id);
> > +uint16_t virtio_pci_get_class_id(uint16_t device_id);
> > +
> > static inline bool virtio_pci_modern(VirtIOPCIProxy *proxy)
> > {
> > return !proxy->disable_modern;
> > --
> > 2.23.0
> >
