From: "Dr. David Alan Gilbert" <dgilbert@redhat.com>
To: Paolo Bonzini <pbonzini@redhat.com>
Cc: "Mark Mielke" <mark.mielke@gmail.com>,
"Daniel P. Berrangé" <berrange@redhat.com>,
qemu-devel@nongnu.org, christian.ehrhardt@canonical.com
Subject: Re: [Qemu-devel] Live migration from Qemu 2.12 hosts to Qemu 3.2 hosts, with VMX flag enabled in the guest?
Date: Fri, 18 Jan 2019 19:31:02 +0000 [thread overview]
Message-ID: <20190118193102.GJ2146@work-vm> (raw)
In-Reply-To: <19ec0017-bd05-a847-b211-ebbdb141ebf6@redhat.com>
* Paolo Bonzini (pbonzini@redhat.com) wrote:
> 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 migration
> > 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.
Still, it should have probably been machine-type tied; there's lots and
lots of broken things we've done in the past which we've kept
compatibility with on old machine types.
Dave
> Paolo
--
Dr. David Alan Gilbert / dgilbert@redhat.com / Manchester, UK
next prev parent reply other threads:[~2019-01-18 19:31 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-01-18 5:32 [Qemu-devel] Live migration from Qemu 2.12 hosts to Qemu 3.2 hosts, with VMX flag enabled in the guest? Mark Mielke
2019-01-18 6:18 ` Christian Ehrhardt
2019-01-22 7:20 ` Like Xu
2019-01-18 10:02 ` Dr. David Alan Gilbert
2019-01-18 10:11 ` Paolo Bonzini
2019-01-18 10:16 ` Dr. David Alan Gilbert
2019-01-18 10:21 ` Daniel P. Berrangé
2019-01-18 12:57 ` Paolo Bonzini
2019-01-18 13:41 ` Mark Mielke
2019-01-18 15:25 ` Paolo Bonzini
2019-01-18 19:31 ` Dr. David Alan Gilbert [this message]
2019-01-22 22:58 ` Mark Mielke
2019-01-18 13:44 ` Daniel P. Berrangé
2019-01-18 14:09 ` Mark Mielke
2019-01-18 14:48 ` Daniel P. Berrangé
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