[PATCH RFC 16/19] vfio-user: pci reset

[Elena Ufimtseva <elena.ufimtseva@oracle.com>]

From: John G Johnson <john.g.johnson@oracle.com>

Send VFIO_USER_DEVICE_RESET to reset remote device.

Signed-off-by: Elena Ufimtseva <elena.ufimtseva@oracle.com>
Signed-off-by: John G Johnson <john.g.johnson@oracle.com>
Signed-off-by: Jagannathan Raman <jag.raman@oracle.com>
---
 hw/vfio/user.h |  1 +
 hw/vfio/pci.c  | 29 ++++++++++++++++++++++++++---
 hw/vfio/user.c | 12 ++++++++++++
 3 files changed, 39 insertions(+), 3 deletions(-)

diff --git a/hw/vfio/user.h b/hw/vfio/user.h
index afb85952da..95c2fb1707 100644
--- a/hw/vfio/user.h
+++ b/hw/vfio/user.h
@@ -254,4 +254,5 @@ void vfio_user_set_reqhandler(VFIODevice *vbasdev,
                                              VFIOUserFDs *fds),
                                              void *reqarg);
 int vfio_user_set_irqs(VFIODevice *vbasedev, struct vfio_irq_set *irq);
+void vfio_user_reset(VFIODevice *vbasedev);
 #endif /* VFIO_USER_H */
diff --git a/hw/vfio/pci.c b/hw/vfio/pci.c
index 52af5a1061..a6c28dac03 100644
--- a/hw/vfio/pci.c
+++ b/hw/vfio/pci.c
@@ -2212,8 +2212,9 @@ static void vfio_pci_pre_reset(VFIOPCIDevice *vdev)
 
 static void vfio_pci_post_reset(VFIOPCIDevice *vdev)
 {
+    VFIODevice *vbasedev = &vdev->vbasedev;
     Error *err = NULL;
-    int nr;
+    int ret, nr;
 
     vfio_intx_enable(vdev, &err);
     if (err) {
@@ -2221,11 +2222,18 @@ static void vfio_pci_post_reset(VFIOPCIDevice *vdev)
     }
 
     for (nr = 0; nr < PCI_NUM_REGIONS - 1; ++nr) {
-        off_t addr = vdev->config_offset + PCI_BASE_ADDRESS_0 + (4 * nr);
+        off_t addr = PCI_BASE_ADDRESS_0 + (4 * nr);
         uint32_t val = 0;
         uint32_t len = sizeof(val);
 
-        if (pwrite(vdev->vbasedev.fd, &val, len, addr) != len) {
+        if (vbasedev->proxy != NULL) {
+            ret = vfio_user_region_write(vbasedev, VFIO_PCI_CONFIG_REGION_INDEX,
+                                         addr, len, &val);
+        } else {
+            ret = pwrite(vdev->vbasedev.fd, &val, len,
+                         vdev->config_offset + addr);
+        }
+        if (ret != len) {
             error_report("%s(%s) reset bar %d failed: %m", __func__,
                          vdev->vbasedev.name, nr);
         }
@@ -3634,6 +3642,20 @@ static void vfio_user_instance_finalize(Object *obj)
     vfio_user_disconnect(vbasedev->proxy);
 }
 
+static void vfio_user_pci_reset(DeviceState *dev)
+{
+    VFIOPCIDevice *vdev = VFIO_PCI_BASE(dev);
+    VFIODevice *vbasedev = &vdev->vbasedev;
+
+    vfio_pci_pre_reset(vdev);
+
+    if (vbasedev->reset_works) {
+        vfio_user_reset(vbasedev);
+    }
+
+    vfio_pci_post_reset(vdev);
+}
+
 static Property vfio_user_pci_dev_properties[] = {
     DEFINE_PROP_STRING("socket", VFIOUserPCIDevice, sock_name),
     DEFINE_PROP_BOOL("secure-dma", VFIOUserPCIDevice, secure, false),
@@ -3645,6 +3667,7 @@ static void vfio_user_pci_dev_class_init(ObjectClass *klass, void *data)
     DeviceClass *dc = DEVICE_CLASS(klass);
     PCIDeviceClass *pdc = PCI_DEVICE_CLASS(klass);
 
+    dc->reset = vfio_user_pci_reset;
     device_class_set_props(dc, vfio_user_pci_dev_properties);
     dc->desc = "VFIO over socket PCI device assignment";
     pdc->realize = vfio_user_pci_realize;
diff --git a/hw/vfio/user.c b/hw/vfio/user.c
index 0fd7e01986..8917596a2f 100644
--- a/hw/vfio/user.c
+++ b/hw/vfio/user.c
@@ -905,3 +905,15 @@ int vfio_user_set_irqs(VFIODevice *vbasedev, struct vfio_irq_set *irq)
 
     return 0;
 }
+
+void vfio_user_reset(VFIODevice *vbasedev)
+{
+    vfio_user_hdr_t msg;
+
+    vfio_user_request_msg(&msg, VFIO_USER_DEVICE_RESET, sizeof(msg), 0);
+
+    vfio_user_send_recv(vbasedev->proxy, &msg, NULL, 0);
+    if (msg.flags & VFIO_USER_ERROR) {
+        error_printf("reset reply error %d\n", msg.error_reply);
+    }
+}
-- 
2.25.1