From: Paul Brook <paul@codesourcery.com>
To: Amit Shah <amit.shah@redhat.com>
Cc: Juan Quintela <quintela@redhat.com>,
"Michael S. Tsirkin" <mst@redhat.com>,
qemu list <qemu-devel@nongnu.org>,
Gerd Hoffmann <kraxel@redhat.com>
Subject: [Qemu-devel] Re: [PATCH 0/8] (v2) chardev, virtio-console: flow control, error handling, fixes
Date: Wed, 7 Apr 2010 23:58:53 +0100 [thread overview]
Message-ID: <201004072358.53971.paul@codesourcery.com> (raw)
In-Reply-To: <1270674156-9345-1-git-send-email-amit.shah@redhat.com>
> Hello,
>
> This patchset introduces flow control to virtio-console and
> chardev-based virtio serial ports. This series is based on the
> previous series I sent on Mar 31st (00/17: v4: virtio-serial fixes,
> new abi for port discovery)
>
> The qemu chardevs can now return -EAGAIN when a non-blocking remote
> isn't ready to accept more data.
>
> Comments?
This is a major change in semantics. Are you sure all users handle this
correctly? My guess is that most of the devices don't.
EAGAIN isn't really a useful response unless you have some way of notifying
the device that it can send more data.
Paul
next prev parent reply other threads:[~2010-04-07 22:59 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-04-07 21:02 [Qemu-devel] [PATCH 0/8] (v2) chardev, virtio-console: flow control, error handling, fixes Amit Shah
2010-04-07 21:02 ` [Qemu-devel] [PATCH 1/8] virtio-serial: throttling: check for throttled status before sending any data Amit Shah
2010-04-07 21:02 ` [Qemu-devel] [PATCH 2/8] virtio-serial: Unthrottle ports once they're closed Amit Shah
2010-04-07 21:02 ` [Qemu-devel] [PATCH 3/8] virtio-serial: Discard unconsumed data before sending port close event Amit Shah
2010-04-07 21:02 ` [Qemu-devel] [PATCH 4/8] virtio-serial: Bus info message for showing port's throttled status Amit Shah
2010-04-07 21:02 ` [Qemu-devel] [PATCH 5/8] char: Let writers know how much data was written in case of errors Amit Shah
2010-04-07 21:02 ` [Qemu-devel] [PATCH 6/8] char: unix: For files that are nonblocking, report -EAGAIN to calling functions Amit Shah
2010-04-07 21:02 ` [Qemu-devel] [PATCH 7/8] virtio-console: Factor out common init between console and generic ports Amit Shah
2010-04-07 21:02 ` [Qemu-devel] [PATCH 8/8] virtio-console: Throttle virtio-serial-bus if we can't consume any more guest data Amit Shah
2010-04-07 22:58 ` Paul Brook [this message]
2010-04-12 7:51 ` [Qemu-devel] Re: [PATCH 0/8] (v2) chardev, virtio-console: flow control, error handling, fixes Gerd Hoffmann
2010-04-12 11:42 ` Paul Brook
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