Merge remote branch 'amit/for-anthony' into staging

hw/qdev-properties.c

@@ -351,8 +351,13 @@ static int parse_chr(DeviceState *dev, Property *prop, const char *str)
     CharDriverState **ptr = qdev_get_prop_ptr(dev, prop);
 
     *ptr = qemu_chr_find(str);
-    if (*ptr == NULL)
+    if (*ptr == NULL) {
         return -ENOENT;
+    }
+    if ((*ptr)->assigned) {
+        return -EEXIST;
+    }
+    (*ptr)->assigned = 1;
     return 0;
 }
 

hw/virtio-console.c

@@ -11,6 +11,7 @@
  */
 
 #include "qemu-char.h"
+#include "qemu-error.h"
 #include "virtio-serial.h"
 
 typedef struct VirtConsole {
@@ -81,8 +82,11 @@ static int virtconsole_exitfn(VirtIOSerialPort *port)
     VirtConsole *vcon = DO_UPCAST(VirtConsole, port, port);
 
     if (vcon->chr) {
-        port->info->have_data = NULL;
-        qemu_chr_close(vcon->chr);
+	/*
+	 * Instead of closing the chardev, free it so it can be used
+	 * for other purposes.
+	 */
+	qemu_chr_add_handlers(vcon->chr, NULL, NULL, NULL, NULL);
     }
 
     return 0;
@@ -113,6 +117,14 @@ static int virtserialport_initfn(VirtIOSerialPort *port)
 {
     VirtConsole *vcon = DO_UPCAST(VirtConsole, port, port);
 
+    if (port->id == 0) {
+        /*
+         * Disallow a generic port at id 0, that's reserved for
+         * console ports.
+         */
+        error_report("Port number 0 on virtio-serial devices reserved for virtconsole devices for backward compatibility.");
+        return -1;
+    }
     return generic_port_init(vcon, port);
 }
 

hw/virtio-pci.c

@@ -18,6 +18,7 @@
 #include "virtio.h"
 #include "virtio-blk.h"
 #include "virtio-net.h"
+#include "virtio-serial.h"
 #include "pci.h"
 #include "qemu-error.h"
 #include "msix.h"
@@ -109,8 +110,7 @@ typedef struct {
 #ifdef CONFIG_LINUX
     V9fsConf fsconf;
 #endif
-    /* Max. number of ports we can have for a the virtio-serial device */
-    uint32_t max_virtserial_ports;
+    virtio_serial_conf serial;
     virtio_net_conf net;
     bool ioeventfd_disabled;
     bool ioeventfd_started;
@@ -770,12 +770,12 @@ static int virtio_serial_init_pci(PCIDevice *pci_dev)
         proxy->class_code != PCI_CLASS_OTHERS)          /* qemu-kvm  */
         proxy->class_code = PCI_CLASS_COMMUNICATION_OTHER;
 
-    vdev = virtio_serial_init(&pci_dev->qdev, proxy->max_virtserial_ports);
+    vdev = virtio_serial_init(&pci_dev->qdev, &proxy->serial);
     if (!vdev) {
         return -1;
     }
     vdev->nvectors = proxy->nvectors == DEV_NVECTORS_UNSPECIFIED
-                                        ? proxy->max_virtserial_ports + 1
+                                        ? proxy->serial.max_virtserial_ports + 1
                                         : proxy->nvectors;
     virtio_init_pci(proxy, vdev,
                     PCI_VENDOR_ID_REDHAT_QUMRANET,
@@ -789,6 +789,7 @@ static int virtio_serial_exit_pci(PCIDevice *pci_dev)
 {
     VirtIOPCIProxy *proxy = DO_UPCAST(VirtIOPCIProxy, pci_dev, pci_dev);
 
+    virtio_pci_stop_ioeventfd(proxy);
     virtio_serial_exit(proxy->vdev);
     return virtio_exit_pci(pci_dev);
 }
@@ -898,12 +899,14 @@ static PCIDeviceInfo virtio_info[] = {
         .init      = virtio_serial_init_pci,
         .exit      = virtio_serial_exit_pci,
         .qdev.props = (Property[]) {
+            DEFINE_PROP_BIT("ioeventfd", VirtIOPCIProxy, flags,
+                            VIRTIO_PCI_FLAG_USE_IOEVENTFD_BIT, true),
             DEFINE_PROP_UINT32("vectors", VirtIOPCIProxy, nvectors,
                                DEV_NVECTORS_UNSPECIFIED),
             DEFINE_PROP_HEX32("class", VirtIOPCIProxy, class_code, 0),
             DEFINE_VIRTIO_COMMON_FEATURES(VirtIOPCIProxy, host_features),
-            DEFINE_PROP_UINT32("max_ports", VirtIOPCIProxy, max_virtserial_ports,
-                               31),
+            DEFINE_PROP_UINT32("max_ports", VirtIOPCIProxy,
+                               serial.max_virtserial_ports, 31),
             DEFINE_PROP_END_OF_LIST(),
         },
         .qdev.reset = virtio_pci_reset,

hw/virtio-serial-bus.c

@@ -442,25 +442,19 @@ static void handle_output(VirtIODevice *vdev, VirtQueue *vq)
 {
     VirtIOSerial *vser;
     VirtIOSerialPort *port;
-    bool discard;
 
     vser = DO_UPCAST(VirtIOSerial, vdev, vdev);
     port = find_port_by_vq(vser, vq);
 
-    discard = false;
     if (!port || !port->host_connected || !port->info->have_data) {
-        discard = true;
-    }
-
-    if (discard) {
         discard_vq_data(vq, vdev);
         return;
     }
-    if (port->throttled) {
-        return;
-    }
 
+    if (!port->throttled) {
         do_flush_queued_data(port, vq, vdev);
+        return;
+    }
 }
 
 static void handle_input(VirtIODevice *vdev, VirtQueue *vq)
@@ -811,19 +805,19 @@ void virtio_serial_port_qdev_register(VirtIOSerialPortInfo *info)
     qdev_register(&info->qdev);
 }
 
-VirtIODevice *virtio_serial_init(DeviceState *dev, uint32_t max_nr_ports)
+VirtIODevice *virtio_serial_init(DeviceState *dev, virtio_serial_conf *conf)
 {
     VirtIOSerial *vser;
     VirtIODevice *vdev;
     uint32_t i, max_supported_ports;
 
-    if (!max_nr_ports)
+    if (!conf->max_virtserial_ports)
         return NULL;
 
     /* Each port takes 2 queues, and one pair is for the control queue */
     max_supported_ports = VIRTIO_PCI_QUEUE_MAX / 2 - 1;
 
-    if (max_nr_ports > max_supported_ports) {
+    if (conf->max_virtserial_ports > max_supported_ports) {
         error_report("maximum ports supported: %u", max_supported_ports);
         return NULL;
     }
@@ -839,9 +833,9 @@ VirtIODevice *virtio_serial_init(DeviceState *dev, uint32_t max_nr_ports)
     vser->bus->vser = vser;
     QTAILQ_INIT(&vser->ports);
 
-    vser->bus->max_nr_ports = max_nr_ports;
-    vser->ivqs = qemu_malloc(max_nr_ports * sizeof(VirtQueue *));
-    vser->ovqs = qemu_malloc(max_nr_ports * sizeof(VirtQueue *));
+    vser->bus->max_nr_ports = conf->max_virtserial_ports;
+    vser->ivqs = qemu_malloc(conf->max_virtserial_ports * sizeof(VirtQueue *));
+    vser->ovqs = qemu_malloc(conf->max_virtserial_ports * sizeof(VirtQueue *));
 
     /* Add a queue for host to guest transfers for port 0 (backward compat) */
     vser->ivqs[0] = virtio_add_queue(vdev, 128, handle_input);
@@ -866,8 +860,8 @@ VirtIODevice *virtio_serial_init(DeviceState *dev, uint32_t max_nr_ports)
         vser->ovqs[i] = virtio_add_queue(vdev, 128, handle_output);
     }
 
-    vser->config.max_nr_ports = max_nr_ports;
-    vser->ports_map = qemu_mallocz(((max_nr_ports + 31) / 32)
+    vser->config.max_nr_ports = conf->max_virtserial_ports;
+    vser->ports_map = qemu_mallocz(((conf->max_virtserial_ports + 31) / 32)
         * sizeof(vser->ports_map[0]));
     /*
      * Reserve location 0 for a console port for backward compat

hw/virtio-serial.h

@@ -45,6 +45,11 @@ struct virtio_console_control {
     uint16_t value;		/* Extra information for the key */
 };
 
+struct virtio_serial_conf {
+    /* Max. number of ports we can have for a virtio-serial device */
+    uint32_t max_virtserial_ports;
+};
+
 /* Some events for the internal messages (control packets) */
 #define VIRTIO_CONSOLE_DEVICE_READY	0
 #define VIRTIO_CONSOLE_PORT_ADD		1

hw/virtio.h

@@ -195,7 +195,8 @@ VirtIODevice *virtio_blk_init(DeviceState *dev, BlockConf *conf);
 struct virtio_net_conf;
 VirtIODevice *virtio_net_init(DeviceState *dev, NICConf *conf,
                               struct virtio_net_conf *net);
-VirtIODevice *virtio_serial_init(DeviceState *dev, uint32_t max_nr_ports);
+typedef struct virtio_serial_conf virtio_serial_conf;
+VirtIODevice *virtio_serial_init(DeviceState *dev, virtio_serial_conf *serial);
 VirtIODevice *virtio_balloon_init(DeviceState *dev);
 #ifdef CONFIG_LINUX
 VirtIODevice *virtio_9p_init(DeviceState *dev, V9fsConf *conf);

qemu-char.c

@@ -197,6 +197,10 @@ void qemu_chr_add_handlers(CharDriverState *s,
                            IOEventHandler *fd_event,
                            void *opaque)
 {
+    if (!opaque) {
+        /* chr driver being released. */
+        s->assigned = 0;
+    }
     s->chr_can_read = fd_can_read;
     s->chr_read = fd_read;
     s->chr_event = fd_event;

qemu-char.h

@@ -70,6 +70,7 @@ struct CharDriverState {
     char *label;
     char *filename;
     int opened;
+    int assigned; /* chardev assigned to a device */
     QTAILQ_ENTRY(CharDriverState) next;
 };