netdev - Re: vhost question

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Date:	Thu, 22 Mar 2012 09:52:24 +0000
From:	Stefan Hajnoczi <stefanha@...il.com>
To:	Steve Glass <stevie.glass@...il.com>
Cc:	virtualization@...ts.linux-foundation.org, kvm@...r.kernel.org,
	netdev@...r.kernel.org
Subject: Re: vhost question

On Thu, Mar 22, 2012 at 1:48 AM, Steve Glass <stevie.glass@...il.com> wrote:
>
> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA1
>
>
> Just some further information concerning my earlier question
> concerning vhost and virtio.
>
> I'm using virtio to implement an emulated mac80211 device in the
> guest. A simple network simulation will be used to control delivery of
> frames between guests and for this I am using the vhost approach.
>
> A simple first-cut attempt at the tx and rx kick handlers are given
> below. When the guest transmits frames the vhost's TX kick handler is
> executed and copies the buffers onto a queue for the intended
> recipient(s). When the vhost's RX kick handler is run it copies the
> buffer from the queue and notifies the client that the buffers have
> been used.
>
> The problem is that if there are no frames in the queue when the guest
> rx kick handler runs then it has to exit and I have to arrange that it
> runs again. That's done in the current prototype by having the guests
> poll using a timer - which is ugly and inefficient. Can I get the
> vhost tx kick handler to wake the appropriate vhost rx kick handler?
> How can I achieve this?

Can you queue a tx->rx kick on the vhost work queue with vhost_work_queue()?

Stefan
--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html