[PATCH v3 3/3] virtio-pci/hmp: implement device specific hmp interface

[Dongli Zhang <dongli.zhang@oracle.com>]

This patch is to implement the device specific interface to dump the
mapping between virtio queues and vectors.

(qemu) info msix -d /machine/peripheral/vscsi0
Msg L.Addr Msg U.Addr Msg Data   Vect Ctrl
0xfee00000 0x00000000 0x00004041 0x00000000
0xfee00000 0x00000000 0x00004051 0x00000000
0xfee00000 0x00000000 0x00004061 0x00000000
0xfee00000 0x00000000 0x00004071 0x00000000
0xfee01000 0x00000000 0x000040b1 0x00000000
0xfee02000 0x00000000 0x000040c1 0x00000000
0xfee03000 0x00000000 0x000040d1 0x00000000

MSI-X PBA
0 0 0 0 0 0 0

virtio pci vector info:
config: 0
queue 0: 1
queue 1: 2
queue 2: 3
queue 3: 4
queue 4: 5
queue 5: 6

Cc: Jason Wang <jasowang@redhat.com>
Cc: Joe Jin <joe.jin@oracle.com>
Suggested-by: Jason Wang <jasowang@redhat.com>
Signed-off-by: Dongli Zhang <dongli.zhang@oracle.com>
Acked-by: Jason Wang <jasowang@redhat.com>
---
 hw/virtio/virtio-pci.c     | 22 ++++++++++++++++++++++
 hw/virtio/virtio.c         | 10 ++++++++++
 include/hw/virtio/virtio.h |  2 ++
 3 files changed, 34 insertions(+)

diff --git a/hw/virtio/virtio-pci.c b/hw/virtio/virtio-pci.c
index 433060ac02..2971e8049c 100644
--- a/hw/virtio/virtio-pci.c
+++ b/hw/virtio/virtio-pci.c
@@ -38,6 +38,7 @@
 #include "hw/virtio/virtio-bus.h"
 #include "qapi/visitor.h"
 #include "sysemu/replay.h"
+#include "monitor/monitor.h"
 
 #define VIRTIO_PCI_REGION_SIZE(dev)     VIRTIO_PCI_CONFIG_OFF(msix_present(dev))
 
@@ -1587,6 +1588,26 @@ static void virtio_pci_modern_io_region_unmap(VirtIOPCIProxy *proxy,
                                 &region->mr);
 }
 
+static void virtio_pci_dc_msix_info(Monitor *mon, PCIDevice *dev,
+                                    Error **errp)
+{
+    DeviceState *qdev = DEVICE(dev);
+    VirtIOPCIProxy *proxy = to_virtio_pci_proxy_fast(qdev);
+    VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
+    int num = virtio_get_num_queues(vdev);
+    int i;
+
+    monitor_printf(mon, "virtio pci vector info:\n");
+
+    monitor_printf(mon, "config: %d\n", virtio_get_config_vector(vdev));
+
+    for (i = 0; i < num; i++)
+        monitor_printf(mon, "queue %d: %u\n",
+                       i, virtio_get_vector(vdev, i));
+
+    monitor_printf(mon, "\n");
+}
+
 static void virtio_pci_pre_plugged(DeviceState *d, Error **errp)
 {
     VirtIOPCIProxy *proxy = VIRTIO_PCI(d);
@@ -2004,6 +2025,7 @@ static void virtio_pci_class_init(ObjectClass *klass, void *data)
     k->vendor_id = PCI_VENDOR_ID_REDHAT_QUMRANET;
     k->revision = VIRTIO_PCI_ABI_VERSION;
     k->class_id = PCI_CLASS_OTHERS;
+    k->msix_info = virtio_pci_dc_msix_info;
     device_class_set_parent_realize(dc, virtio_pci_dc_realize,
                                     &vpciklass->parent_dc_realize);
     dc->reset = virtio_pci_reset;
diff --git a/hw/virtio/virtio.c b/hw/virtio/virtio.c
index 874377f37a..ea54939e98 100644
--- a/hw/virtio/virtio.c
+++ b/hw/virtio/virtio.c
@@ -2581,6 +2581,16 @@ void virtio_notify_config(VirtIODevice *vdev)
     virtio_notify_vector(vdev, vdev->config_vector);
 }
 
+uint16_t virtio_get_vector(VirtIODevice *vdev, int n)
+{
+    return vdev->vq[n].vector;
+}
+
+uint16_t virtio_get_config_vector(VirtIODevice *vdev)
+{
+    return vdev->config_vector;
+}
+
 static bool virtio_device_endian_needed(void *opaque)
 {
     VirtIODevice *vdev = opaque;
diff --git a/include/hw/virtio/virtio.h b/include/hw/virtio/virtio.h
index 8bab9cfb75..6746227f73 100644
--- a/include/hw/virtio/virtio.h
+++ b/include/hw/virtio/virtio.h
@@ -268,6 +268,8 @@ int virtio_set_status(VirtIODevice *vdev, uint8_t val);
 void virtio_reset(void *opaque);
 void virtio_update_irq(VirtIODevice *vdev);
 int virtio_set_features(VirtIODevice *vdev, uint64_t val);
+uint16_t virtio_get_vector(VirtIODevice *vdev, int n);
+uint16_t virtio_get_config_vector(VirtIODevice *vdev);
 
 /* Base devices.  */
 typedef struct VirtIOBlkConf VirtIOBlkConf;
-- 
2.17.1