Re: [Qemu-devel] [PATCHv2] Fix virtio-console failure on unconnected pty

[Amit Shah]

On (Thu) 29 Dec 2011 [13:47:43], Christian Borntraeger wrote:
> From: Christian Borntraeger <address@hidden>
>     
> when I tried qemu with -virtio-console pty the guest hangs and attaching on 
> /dev/pts/<x> does
> not return anything if the attachement is too late.
> Turns out that the console is already throttled and the guest is heavily 
> spinning but get_buf
> never returns the buffer. There seems to be no way for the console to 
> unthrottle the port.

It doesn't really get throttled, since the throttling
enabling/disabling isn't yet done in QEMU.  What happens is that the
chardev buffer gets filled up and qemu_chr_fe_write() doesn't return
-- send_all() keeps spinning.

I'll adjust the commit log message and submit.

Thanks.

                Amit