From mboxrd@z Thu Jan 1 00:00:00 1970 From: Marc Zyngier Subject: Re: Status of live migration on ARMv7 Date: Tue, 14 Jun 2016 22:09:40 +0100 Message-ID: <20160614220940.171387d5@arm.com> References: <20160614202025.226dd45d@arm.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: Received: from localhost (localhost [127.0.0.1]) by mm01.cs.columbia.edu (Postfix) with ESMTP id EAB43499A1 for ; Tue, 14 Jun 2016 17:05:15 -0400 (EDT) Received: from mm01.cs.columbia.edu ([127.0.0.1]) by localhost (mm01.cs.columbia.edu [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id NW9AJNLlXG68 for ; Tue, 14 Jun 2016 17:05:14 -0400 (EDT) Received: from foss.arm.com (foss.arm.com [217.140.101.70]) by mm01.cs.columbia.edu (Postfix) with ESMTP id D7C46410EB for ; Tue, 14 Jun 2016 17:05:14 -0400 (EDT) In-Reply-To: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: kvmarm-bounces@lists.cs.columbia.edu Sender: kvmarm-bounces@lists.cs.columbia.edu To: ib10evp0@gmx.org Cc: kvmarm@lists.cs.columbia.edu List-Id: kvmarm@lists.cs.columbia.edu On Tue, 14 Jun 2016 22:52:41 +0200 wrote: > Hi Marc, > > > Everything that's needed for a typical ARMv7 is already in mainline, > > both for the kernel and qemu. And since the code is almost entirely > > shared with ARMv8, it is probably in the same state. If it not working, > > then it is a bug that should be addressed. > > > > > BTW: The Migration page [3] claims the migration feature is hardware > > > independent but it remains unclear if this expands to CPU > > > architectures and if this applies to live migration or only offline > > > migration. Some clarification in this regard would be nice to have. > > > > We do have support for live migration (migrating the VM whilst it is > > still running, tracking memory that gets dirtied). > > After reading this it's still not entirely clear to me if live migration using > your definition is also available for ARMv7 in the mainline kernel. Could you > confirm this with one sentence, please? Sorry for the inconvenience. I know it is available because I did review the code. Look for commits 7276030 KVM: arm/arm64: Enable Dirty Page logging for ARMv8 15a49a4 KVM: arm: page logging 2nd stage fault handling 53c810c KVM: arm: dirty logging write protect support c647355 KVM: arm: Add initial dirty page locking support as well as the generic infrastructure that precede them. M. -- Jazz is not dead. It just smells funny.