在 2022/5/12 14:56, Michael S. Tsirkin 写道:
On Thu, May 12, 2022 at 02:21:01PM +0800, Longpeng(Mike) wrote:
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.
Signed-off-by: Longpeng <longpe...@huawei.com>
Except, the IDs in the current header a broken. I just fixed them
and they will be hopefully OK in the next version.
Do you mean this patch ?
```
virtio: fix virtio transitional ids
This commit fixes the transitional PCI device ID.
Fixes: d61914ea6ada ("virtio: update virtio id table, add transitional ids")
Signed-off-by: Shunsuke Mie <m...@igel.co.jp>
Link: https://lore.kernel.org/r/20220510102723.87666-1-...@igel.co.jp
Signed-off-by: Michael S. Tsirkin <m...@redhat.com>
```
Luckily, we use PCI_DEVICE_ID_VIRTIO_xxx instead of VIRTIO_TRANS_ID_xxx
here.
---
hw/virtio/virtio-pci.c | 77 ++++++++++++++++++++++++++++++++++++++++++
hw/virtio/virtio-pci.h | 5 +++
2 files changed, 82 insertions(+)
diff --git a/hw/virtio/virtio-pci.c b/hw/virtio/virtio-pci.c
index 7cf1231c1c..fdfa205cee 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"
@@ -212,6 +213,79 @@ 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;
+
+#define VIRTIO_TRANS_DEV_ID_INFO(name, class) \
+ { \
+ .vdev_id = VIRTIO_ID_##name, \
+ .trans_devid = PCI_DEVICE_ID_VIRTIO_##name, \
+ .class_id = class, \
+ }
+
+#define VIRTIO_MODERN_DEV_ID_NFO(name, class) \
+ { \
+ .vdev_id = VIRTIO_ID_##name, \
+ .class_id = class, \
+ }
+
No, I think I liked the original approach in the RFC better, even though
it duplicates a tiny bit of code.
This trick does not save a lot of typing and obscures the ID
use in case it's wrong (as was the case just recently).
OK, will do in v6.
Thanks.
+static const VirtIOPCIIDInfo virtio_pci_id_info[] = {
+ /* Non-transitional devices */
+ VIRTIO_MODERN_DEV_ID_NFO(CRYPTO, PCI_CLASS_OTHERS),
+ VIRTIO_MODERN_DEV_ID_NFO(FS, PCI_CLASS_STORAGE_OTHER),
+ /* Transitional devices */
+ VIRTIO_TRANS_DEV_ID_INFO(NET, PCI_CLASS_NETWORK_ETHERNET),
+ VIRTIO_TRANS_DEV_ID_INFO(BLOCK, PCI_CLASS_STORAGE_SCSI),
+ VIRTIO_TRANS_DEV_ID_INFO(CONSOLE, PCI_CLASS_COMMUNICATION_OTHER),
+ VIRTIO_TRANS_DEV_ID_INFO(SCSI, PCI_CLASS_STORAGE_SCSI),
+ VIRTIO_TRANS_DEV_ID_INFO(9P, PCI_BASE_CLASS_NETWORK),
+ VIRTIO_TRANS_DEV_ID_INFO(BALLOON, PCI_CLASS_OTHERS),
+ VIRTIO_TRANS_DEV_ID_INFO(RNG, 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);
@@ -1675,6 +1749,9 @@ 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/hw/virtio/virtio-pci.h b/hw/virtio/virtio-pci.h
index 2446dcd9ae..f08665cd1b 100644
--- a/hw/virtio/virtio-pci.h
+++ b/hw/virtio/virtio-pci.h
@@ -146,6 +146,8 @@ 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;
@@ -158,6 +160,9 @@ struct VirtIOPCIProxy {
VirtioBusState bus;
};
+uint16_t virtio_pci_get_trans_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
.
