On Thu, Mar 29, 2012 at 09:42:32AM +0000, Charles.Tsai-蔡清海-研究發展部 wrote:
> Alon,
>
> Forget my previous mail. When I dig into the vdservice, I found there was one
> bug to check the overlay I/O status after calling the VirtIO write function.
> After I fixed the bug, I can see more printing raw data inside the Qemu now.
> Although I still find some issues, hopefully I can fix it as I debug more
> codes in both spice client and spice server. Thank you for your time.
Great that you managed to progress. Can you send a patch for the
vdservice issue? Is it a bug in the original or just in the one you
modified for printer channel?
>
> -----Original Message-----
> From: Charles.Tsai-蔡清海-研究發展部
> Sent: Wednesday, March 28, 2012 6:07 PM
> To: 'Alon Levy'
> Cc: spice-devel@lists.freedesktop.org
> Subject: Read data out of the Virtqueue
>
> Alon,
>
> My printer driver can write the printing raw data into virtIO driver. But I
> cannot see the found the printing raw data in the spice server. For the
> vdagent, I found the following code segment which is a callback to read the
> data from the vdi_port. Do I need to add a similar code to read the data from
> the Virtio?
>
> In Qemu, I do see vmc_write is called when the printer driver writes the
> printing raw data into the virtIOdevice.
> Consequently, function "spicevmc_red_channel_send_item" should be called to
> send the payload to the spice client. But I did not see function
> "spicevmc_red_channel_send_item" is called either. It looks like the printing
> rawa data is still inside the VirtIO queue. What function I need to add so as
> to pull the data out of the VirtIO queue?
>
> =======================================================================================
> struct SpiceCharDeviceState vdagent_char_device_state = {
> .wakeup = &vdagent_char_device_wakeup, };
>
>
> void vdagent_char_device_wakeup(SpiceCharDeviceInstance *sin) {
> while (read_from_vdi_port());
> }
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