From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([209.51.188.92]:50711) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1gkW1h-0000RG-66 for qemu-devel@nongnu.org; Fri, 18 Jan 2019 10:25:46 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1gkW1g-0002DV-8Z for qemu-devel@nongnu.org; Fri, 18 Jan 2019 10:25:45 -0500 Received: from mx1.redhat.com ([209.132.183.28]:59788) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1gkW1f-0001o6-HS for qemu-devel@nongnu.org; Fri, 18 Jan 2019 10:25:43 -0500 References: <20190118100159.GA2483@work-vm> <8f0f7339-5f47-46d0-20a9-343badad4d0f@redhat.com> <20190118101633.GC2146@work-vm> <20190118102102.GH20660@redhat.com> <328f912c-e332-3bdc-d333-55c4af1a1fa1@redhat.com> From: Paolo Bonzini Message-ID: <19ec0017-bd05-a847-b211-ebbdb141ebf6@redhat.com> Date: Fri, 18 Jan 2019 16:25:27 +0100 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: quoted-printable Subject: Re: [Qemu-devel] Live migration from Qemu 2.12 hosts to Qemu 3.2 hosts, with VMX flag enabled in the guest? List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: Mark Mielke Cc: =?UTF-8?Q?Daniel_P=2e_Berrang=c3=a9?= , "Dr. David Alan Gilbert" , qemu-devel@nongnu.org, christian.ehrhardt@canonical.com On 18/01/19 14:41, Mark Mielke wrote: > It is useful to understand the risk. However, this is the same risk we > have been successfully living with for several years now, and it seems > abrupt to declare 3.1 and 3.2 as the Qemu version beyond which migratio= n > requires a whole cluster restart whether or not a L2 guest had been, or > will ever be started on any of the guests. Only if nested was enabled for the kvm_intel module. If you didn't enable it, you didn't see any change with 3.1. Nested was enabled for kvm_amd years ago. It was a mistake, but that's why we didn't add such a blocker for AMD. Paolo