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Date: Thu, 10 Mar 2016 13:27:28 +0530 From: Amit Shah <amit.shah@...hat.com> To: "Li, Liang Z" <liang.z.li@...el.com> Cc: "quintela@...hat.com" <quintela@...hat.com>, "qemu-devel@...gnu.org" <qemu-devel@...gnu.org>, "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, "mst@...hat.com" <mst@...hat.com>, "akpm@...ux-foundation.org" <akpm@...ux-foundation.org>, "pbonzini@...hat.com" <pbonzini@...hat.com>, "rth@...ddle.net" <rth@...ddle.net>, "ehabkost@...hat.com" <ehabkost@...hat.com>, "linux-mm@...ck.org" <linux-mm@...ck.org>, "virtualization@...ts.linux-foundation.org" <virtualization@...ts.linux-foundation.org>, "kvm@...r.kernel.org" <kvm@...r.kernel.org>, "dgilbert@...hat.com" <dgilbert@...hat.com> Subject: Re: [RFC qemu 0/4] A PV solution for live migration optimization On (Thu) 10 Mar 2016 [07:44:19], Li, Liang Z wrote: > > Hi Amit, > > Could provide more information on how to use virtio-serial to exchange data? Thread , Wiki or code are all OK. > I have not find some useful information yet. See this commit in the Linux sources: 108fc82596e3b66b819df9d28c1ebbc9ab5de14c that adds a way to send guest trace data over to the host. I think that's the most relevant to your use-case. However, you'll have to add an in-kernel user of virtio-serial (like the virtio-console code -- the code that deals with tty and hvc currently). There's no other non-tty user right now, and this is the right kind of use-case to add one for! For many other (userspace) use-cases, see the qemu-guest-agent in the qemu sources. The API is documented in the wiki: http://www.linux-kvm.org/page/Virtio-serial_API and the feature pages have some information that may help as well: https://fedoraproject.org/wiki/Features/VirtioSerial There are some links in here too: http://log.amitshah.net/2010/09/communication-between-guests-and-hosts/ Hope this helps. Amit
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