From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-9.2 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING,SPF_HELO_NONE, SPF_PASS autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id EEBA7C47095 for ; Wed, 9 Jun 2021 09:15:06 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id D22546120F for ; Wed, 9 Jun 2021 09:15:06 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233848AbhFIJRA (ORCPT ); Wed, 9 Jun 2021 05:17:00 -0400 Received: from mail.kernel.org ([198.145.29.99]:55110 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231219AbhFIJQ7 (ORCPT ); Wed, 9 Jun 2021 05:16:59 -0400 Received: by mail.kernel.org (Postfix) with ESMTPS id 412E7610E6 for ; Wed, 9 Jun 2021 09:15:05 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1623230105; bh=Ap3nCwgJEg8YK6V5nXxzEi4ebCHoe4dYVyikyDZoxe8=; h=From:To:Subject:Date:In-Reply-To:References:From; b=Wy5jcxrPP151w4EnRESfEt/h8FASHuLTtsp/FLaCG/WYVbDkljWWU2Yvx5PwS87M4 cnvUScTUhDO3N5mWXNQ61oFNrlK3vskCC85ATRYSc/I9EwP7Mq+ZdGUvoDhNj0n2RR zdXdtpSUyCCRYHHQdV6QvioVBApGozenAjzgzkA561j1i5BFqg0dEY8ByxMquSQXMJ kpf2lD/aq5Ryj1DzhyAsBD+zhW9+6I0zwew3AgrrL+p3Tk4ob9F8Q65GpxJ+OOlQch 1/sMcN03x/K9DZ4U6B6zeAmXAPJKnjsxUNjx1osbi4fd8L6ilJZBzHHCCpL5E3lr9I zw7bjyvfrpNMw== From: bugzilla-daemon@bugzilla.kernel.org To: kvm@vger.kernel.org Subject: [Bug 53851] nVMX: Support live migration of whole L1 guest Date: Wed, 09 Jun 2021 09:15:04 +0000 X-Bugzilla-Reason: None X-Bugzilla-Type: changed X-Bugzilla-Watch-Reason: AssignedTo virtualization_kvm@kernel-bugs.osdl.org X-Bugzilla-Product: Virtualization X-Bugzilla-Component: kvm X-Bugzilla-Version: unspecified X-Bugzilla-Keywords: X-Bugzilla-Severity: low X-Bugzilla-Who: mlevitsk@redhat.com X-Bugzilla-Status: NEW X-Bugzilla-Resolution: X-Bugzilla-Priority: P1 X-Bugzilla-Assigned-To: virtualization_kvm@kernel-bugs.osdl.org X-Bugzilla-Flags: X-Bugzilla-Changed-Fields: Message-ID: In-Reply-To: References: Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Bugzilla-URL: https://bugzilla.kernel.org/ Auto-Submitted: auto-generated MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org https://bugzilla.kernel.org/show_bug.cgi?id=3D53851 --- Comment #3 from mlevitsk@redhat.com --- On Wed, 2021-06-09 at 08:55 +0000, bugzilla-daemon@bugzilla.kernel.org wrot= e: > https://bugzilla.kernel.org/show_bug.cgi?id=3D53851 >=20 > --- Comment #2 from christian.rohmann@frittentheke.de --- > Sorry for replying to this rather old bug - I was pointed to this via > https://www.linux-kvm.org/page/Nested_Guests#Limitations=20 >=20 >=20 > If I may ask, is this really the last state of discussion and work on this > issue? > Looking at i.e.=20 >=20 > * > https://github.com/qemu/qemu/commit/ebbfef2f34cfc749c045a4569dedb4f748ec0= 24a > * > > https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit= /?id=3D039aeb9deb9291f3b19c375a8bc6fa7f768996cc >=20 >=20 > there have been commits for the kernel as well as QEMU to support migrati= on > of > nested VMs. >=20 AFAIK, running nested guests and migration while nested guest is running sh= ould work on both Intel and AMD, but there were lots of fixes in this area recen= tly so a very new kernel should be used. Plus in some cases if the nested guest is 32 bit, the migration still can f= ail, on Intel at least, last time I checked. On AMD I just recently fixed such issue for 32 bit guest and it seems to work for me. I also know that if the nested guest is hyper-v enabled (which is a bit overkill as this brings us to a double nesting), then it crashes once in a whileafter l= ots of migration cycles. So there are still bugs, but overall it works. Best regards, Maxim Levitsky --=20 You may reply to this email to add a comment. You are receiving this mail because: You are watching the assignee of the bug.=