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

From: Andreas Färber
Subject: Re: [Qemu-devel] [PATCHv2] Fix virtio-console failure on unconnected pty
Date: Thu, 29 Dec 2011 14:39:22 +0100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:9.0) Gecko/20111220 Thunderbird/9.0

Am 29.12.2011 14:27, schrieb 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.

"attachment", while you're at it.


>> 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

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