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From: Sasha Levin <levinsasha928@gmail.com>
To: Avi Kivity <avi@redhat.com>
Cc: kvm <kvm@vger.kernel.org>, Ingo Molnar <mingo@elte.hu>,
	Pekka Enberg <penberg@kernel.org>,
	Asias He <asias.hejun@gmail.com>,
	Prasad Joshi <prasadjoshi124@gmail.com>,
	Cyrill Gorcunov <gorcunov@gmail.com>
Subject: ioeventfd question
Date: Thu, 26 May 2011 22:03:40 +0300	[thread overview]
Message-ID: <1306436620.3065.43.camel@lappy> (raw)

Hi Avi,

I'm working on adding ioeventfd support into tools/kvm/.
Currently the implementation creates ioeventfd entries at the
'VIRTIO_PCI_QUEUE_NOTIFY' of each device and waits on all of them using
epoll().
The basics are working - when IO is triggered I receive a notification
using the event instead of an exit.

I couldn't find a way to retrieve the value written to the PIO port -
the guest memory at that location doesn't change, 'reading' the event
just returns 1 (as expected) and I couldn't find anything else which
might suggest what value was written to the PIO port.

This is an issue with devices which have multiple virtio-rings, such as
virtio-net.

-- 

Sasha.


             reply	other threads:[~2011-05-26 19:03 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2011-05-26 19:03 Sasha Levin [this message]
2011-05-27  8:30 ` ioeventfd question Avi Kivity
2011-05-27  8:39   ` Sasha Levin

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