Re: [Xen-devel] [PATCH 2/2] xen: add qemu device for each pvusb backend

[Gerd Hoffmann]

  Hi,

> > Hmm, I think the xen core needs better QOM support ...
> > 
> > struct XenDevice should have a DeviceState element, so it can be used as
> > device object directly instead of attaching a device object like
> > this ...
> 
> Hmm, interesting idea. The device object could even be added in
> Xen common code if the backend is indicating the need for it via a
> special flag/field. I'll have a try.

No, not optional.  Just turn *all* xen devices into QOM objects.

XenDevice should probably a subclass of the base device object
(DeviceState), and all Xen backends (block, net, fb, pvusb, ...)
should be subclasses of XenDevice.

The latter is probably how things are modeled already, just the QOM
object stuff is missing (register classes, macros to cast objects, ...)
because qdev (the QOM predecessor) didn't have that.

Once this is in place you can simply use DEVICE(xendevice) to get the
DeviceState pointer.

cheers,
  Gerd

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Re: [Xen-devel] [PATCH 2/2] xen: add qemu device for each pvusb backend

[Juergen Gross]

On 27/09/16 11:08, Gerd Hoffmann wrote:
>   Hi,
> 
>>  struct usbback_info {
>>  struct XenDevice xendev;  /* must be first */
>> +char id[24];
>> +struct USBBACKDevice *dev;
>>  USBBus   bus;
>>  void *urb_sring;
>>  void *conn_sring;
>> @@ -116,6 +124,10 @@ struct usbback_info {
>>  QEMUBH   *bh;
>>  };
>>  
>> +typedef struct USBBACKDevice {
>> +DeviceState qdev;
>> +} USBBACKDevice;
> 
> Hmm, I think the xen core needs better QOM support ...
> 
> struct XenDevice should have a DeviceState element, so it can be used as
> device object directly instead of attaching a device object like
> this ...

Hmm, interesting idea. The device object could even be added in
Xen common code if the backend is indicating the need for it via a
special flag/field. I'll have a try.


Juergen


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Re: [Xen-devel] [PATCH 2/2] xen: add qemu device for each pvusb backend

[Gerd Hoffmann]

  Hi,

>  struct usbback_info {
>  struct XenDevice xendev;  /* must be first */
> +char id[24];
> +struct USBBACKDevice *dev;
>  USBBus   bus;
>  void *urb_sring;
>  void *conn_sring;
> @@ -116,6 +124,10 @@ struct usbback_info {
>  QEMUBH   *bh;
>  };
>  
> +typedef struct USBBACKDevice {
> +DeviceState qdev;
> +} USBBACKDevice;

Hmm, I think the xen core needs better QOM support ...

struct XenDevice should have a DeviceState element, so it can be used as
device object directly instead of attaching a device object like
this ...

cheers,
  Gerd


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[Xen-devel] [PATCH 2/2] xen: add qemu device for each pvusb backend

[Juergen Gross]

In order to be able to specify to which pvusb controller a new pvusb
device should be added we need a qemu device for each pvusb controller
with an associated id.

Add such a device when a new controller is requested and attach the
usb bus of that controller to the new device. Any device connected to
that controller can now specify the bus and port directly via its
properties.

Signed-off-by: Juergen Gross 
---
 hw/usb/xen-usb.c | 81 +++-
 1 file changed, 68 insertions(+), 13 deletions(-)

diff --git a/hw/usb/xen-usb.c b/hw/usb/xen-usb.c
index 174d715..439d104 100644
--- a/hw/usb/xen-usb.c
+++ b/hw/usb/xen-usb.c
@@ -29,6 +29,7 @@
 #include "hw/usb.h"
 #include "hw/xen/xen_backend.h"
 #include "monitor/qdev.h"
+#include "qapi/error.h"
 #include "qapi/qmp/qbool.h"
 #include "qapi/qmp/qint.h"
 #include "qapi/qmp/qstring.h"
@@ -47,12 +48,16 @@
 struct timeval tv;  \
 \
 gettimeofday(, NULL);\
-xen_be_printf(xendev, lvl, "%8ld.%06ld xen-usb(%s):" fmt,   \
+xen_be_printf(xendev, 0, "%8ld.%06ld xen-usb(%s):" fmt,   \
   tv.tv_sec, tv.tv_usec, __func__, ##args); \
 }
 #define TR_BUS(xendev, fmt, args...) TR(xendev, 2, fmt, ##args)
 #define TR_REQ(xendev, fmt, args...) TR(xendev, 3, fmt, ##args)
 
+#define TYPE_USBBACK"xen-pvusb"
+#define USBBACK_DEVICE(obj) \
+ OBJECT_CHECK(USBBACKDevice, (obj), TYPE_USBBACK)
+
 #define USBBACK_MAXPORTSUSBIF_PIPE_PORT_MASK
 #define USB_DEV_ADDR_SIZE   (USBIF_PIPE_DEV_MASK + 1)
 
@@ -67,6 +72,7 @@ struct usbif_ctrlrequest {
 
 struct usbback_info;
 struct usbback_req;
+struct USBBACKDevice;
 
 struct usbback_stub {
 USBDevice *dev;
@@ -101,6 +107,8 @@ struct usbback_hotplug {
 
 struct usbback_info {
 struct XenDevice xendev;  /* must be first */
+char id[24];
+struct USBBACKDevice *dev;
 USBBus   bus;
 void *urb_sring;
 void *conn_sring;
@@ -116,6 +124,10 @@ struct usbback_info {
 QEMUBH   *bh;
 };
 
+typedef struct USBBACKDevice {
+DeviceState qdev;
+} USBBACKDevice;
+
 static struct usbback_req *usbback_get_req(struct usbback_info *usbif)
 {
 struct usbback_req *usbback_req;
@@ -712,15 +724,10 @@ static void usbback_portid_detach(struct usbback_info 
*usbif, unsigned port)
 
 static void usbback_portid_remove(struct usbback_info *usbif, unsigned port)
 {
-USBPort *p;
-
 if (!usbif->ports[port - 1].dev) {
 return;
 }
 
-p = &(usbif->ports[port - 1].port);
-snprintf(p->path, sizeof(p->path), "%d", 99);
-
 object_unparent(OBJECT(usbif->ports[port - 1].dev));
 usbif->ports[port - 1].dev = NULL;
 usbback_portid_detach(usbif, port);
@@ -733,10 +740,10 @@ static void usbback_portid_add(struct usbback_info 
*usbif, unsigned port,
 {
 unsigned speed;
 char *portname;
-USBPort *p;
 Error *local_err = NULL;
 QDict *qdict;
 QemuOpts *opts;
+char tmp[32];
 
 if (usbif->ports[port - 1].dev) {
 return;
@@ -749,11 +756,14 @@ static void usbback_portid_add(struct usbback_info 
*usbif, unsigned port,
 return;
 }
 portname++;
-p = &(usbif->ports[port - 1].port);
-snprintf(p->path, sizeof(p->path), "%s", portname);
 
 qdict = qdict_new();
 qdict_put(qdict, "driver", qstring_from_str("usb-host"));
+snprintf(tmp, sizeof(tmp), "%s.0", usbif->id);
+qdict_put(qdict, "bus", qstring_from_str(tmp));
+snprintf(tmp, sizeof(tmp), "%s-%u", usbif->id, port);
+qdict_put(qdict, "id", qstring_from_str(tmp));
+qdict_put(qdict, "port", qint_from_int(port));
 qdict_put(qdict, "hostbus", qint_from_int(atoi(busid)));
 qdict_put(qdict, "hostport", qstring_from_str(portname));
 opts = qemu_opts_from_qdict(qemu_find_opts("device"), qdict, _err);
@@ -765,7 +775,6 @@ static void usbback_portid_add(struct usbback_info *usbif, 
unsigned port,
 goto err;
 }
 QDECREF(qdict);
-snprintf(p->path, sizeof(p->path), "%d", port);
 speed = usbif->ports[port - 1].dev->speed;
 switch (speed) {
 case USB_SPEED_LOW:
@@ -799,7 +808,6 @@ static void usbback_portid_add(struct usbback_info *usbif, 
unsigned port,
 
 err:
 QDECREF(qdict);
-snprintf(p->path, sizeof(p->path), "%d", 99);
 xen_be_printf(>xendev, 0, "device %s could not be opened\n", busid);
 }
 
@@ -1009,16 +1017,36 @@ static void usbback_alloc(struct XenDevice *xendev)
 struct usbback_info *usbif;
 USBPort *p;
 unsigned int i, max_grants;
+Error *local_err = NULL;
+QDict *qdict;
+QemuOpts *opts;
 
 usbif = container_of(xendev, struct usbback_info, xendev);
 
-usb_bus_new(>bus, sizeof(usbif->bus), _usb_bus_ops, xen_sysdev);