From: Longpeng <longpe...@huawei.com>
Add helpers to get the "Transitional PCI Device ID" and "class_id"
of the device specified by the "Virtio Device ID".
These helpers will be used to build the generic vDPA device later.
Acked-by: Jason Wang <jasow...@redhat.com>
Signed-off-by: Longpeng <longpe...@huawei.com>
---
hw/virtio/virtio-pci.c | 88 ++++++++++++++++++++++++++++++++++
include/hw/virtio/virtio-pci.h | 5 ++
2 files changed, 93 insertions(+)
diff --git a/hw/virtio/virtio-pci.c b/hw/virtio/virtio-pci.c
index a1c9dfa7bb..a602f670ca 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"
@@ -224,6 +225,90 @@ static int virtio_pci_load_queue(DeviceState *d, int n,
QEMUFile *f)
return 0;
}
+typedef struct VirtIOPCIIDInfo {
+ /* virtio id */
+ uint16_t vdev_id;
+ /* pci device id for the transitional device */
+ uint16_t trans_devid;
+ uint16_t class_id;
+} VirtIOPCIIDInfo;
+
+static const VirtIOPCIIDInfo virtio_pci_id_info[] = {
+ {
+ .vdev_id = VIRTIO_ID_CRYPTO,
+ .class_id = PCI_CLASS_OTHERS,
+ }, {
+ .vdev_id = VIRTIO_ID_FS,
+ .class_id = PCI_CLASS_STORAGE_OTHER,
+ }, {
+ .vdev_id = VIRTIO_ID_NET,
+ .trans_devid = PCI_DEVICE_ID_VIRTIO_NET,
+ .class_id = PCI_CLASS_NETWORK_ETHERNET,
+ }, {
+ .vdev_id = VIRTIO_ID_BLOCK,
+ .trans_devid = PCI_DEVICE_ID_VIRTIO_BLOCK,
+ .class_id = PCI_CLASS_STORAGE_SCSI,
+ }, {
+ .vdev_id = VIRTIO_ID_CONSOLE,
+ .trans_devid = PCI_DEVICE_ID_VIRTIO_CONSOLE,
+ .class_id = PCI_CLASS_COMMUNICATION_OTHER,
+ }, {
+ .vdev_id = VIRTIO_ID_SCSI,
+ .trans_devid = PCI_DEVICE_ID_VIRTIO_SCSI,
+ .class_id = PCI_CLASS_STORAGE_SCSI
+ }, {
+ .vdev_id = VIRTIO_ID_9P,
+ .trans_devid = PCI_DEVICE_ID_VIRTIO_9P,
+ .class_id = PCI_BASE_CLASS_NETWORK,
+ }, {
+ .vdev_id = VIRTIO_ID_BALLOON,
+ .trans_devid = PCI_DEVICE_ID_VIRTIO_BALLOON,
+ .class_id = PCI_CLASS_OTHERS,
+ }, {
+ .vdev_id = VIRTIO_ID_RNG,
+ .trans_devid = PCI_DEVICE_ID_VIRTIO_RNG,
+ .class_id = PCI_CLASS_OTHERS,
+ },
+};
+
+static const VirtIOPCIIDInfo *virtio_pci_get_id_info(uint16_t vdev_id)
+{
+ const VirtIOPCIIDInfo *info = NULL;
+ 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;
+ }
+ }
+
+ if (!info) {
+ /* The device id is invalid or not added to the id_info yet. */
+ error_report("Invalid virtio device(id %u)", vdev_id);
+ abort();
+ }
+
+ return info;
+}
+
+/*
+ * Get the Transitional Device ID for the specific device, return
+ * zero if the device is non-transitional.
+ */
+uint16_t virtio_pci_get_trans_devid(uint16_t device_id)
+{
+ return virtio_pci_get_id_info(device_id)->trans_devid;
+}
+
+/*
+ * Get the Class ID for the specific device.
+ */
+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);
@@ -1729,6 +1814,9 @@ 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->trans_devid) {
+ pci_config_set_device_id(config, proxy->trans_devid);
+ }
} else {
/* pure virtio-1.0 */
pci_set_word(config + PCI_VENDOR_ID,
diff --git a/include/hw/virtio/virtio-pci.h b/include/hw/virtio/virtio-pci.h
index 938799e8f6..24fba1604b 100644
--- a/include/hw/virtio/virtio-pci.h
+++ b/include/hw/virtio/virtio-pci.h
@@ -151,6 +151,8 @@ struct VirtIOPCIProxy {
bool disable_modern;
bool ignore_backend_features;
OnOffAuto disable_legacy;
+ /* Transitional device id */
+ uint16_t trans_devid;
uint32_t class_code;
uint32_t nvectors;
uint32_t dfselect;
@@ -184,6 +186,9 @@ static inline void virtio_pci_disable_modern(VirtIOPCIProxy
*proxy)
proxy->disable_modern = true;
}
+uint16_t virtio_pci_get_trans_devid(uint16_t device_id);
+uint16_t virtio_pci_get_class_id(uint16_t device_id);
+
/*
* virtio-input-pci: This extends VirtioPCIProxy.
*/
--
2.23.0
