linux-kernel - RE: [RFC qemu 0/4] A PV solution for live migration optimization

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Message-ID: <F2CBF3009FA73547804AE4C663CAB28E0414A860@shsmsx102.ccr.corp.intel.com>
Date:	Thu, 10 Mar 2016 08:36:14 +0000
From:	"Li, Liang Z" <liang.z.li@...el.com>
To:	Amit Shah <amit.shah@...hat.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

> >  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

Thanks a lot !!

Liang