From owner-freebsd-virtualization@freebsd.org Mon Jan 20 06:03:57 2020 Return-Path: Delivered-To: freebsd-virtualization@mailman.nyi.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.nyi.freebsd.org (Postfix) with ESMTP id 9BC8022E714 for ; Mon, 20 Jan 2020 06:03:57 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: from mailman.nyi.freebsd.org (mailman.nyi.freebsd.org [IPv6:2610:1c1:1:606c::50:13]) by mx1.freebsd.org (Postfix) with ESMTP id 481LhY3kFwz47cf for ; Mon, 20 Jan 2020 06:03:57 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: by mailman.nyi.freebsd.org (Postfix) id 7DCF322E713; Mon, 20 Jan 2020 06:03:57 +0000 (UTC) Delivered-To: virtualization@mailman.nyi.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.nyi.freebsd.org (Postfix) with ESMTP id 7C75222E712 for ; Mon, 20 Jan 2020 06:03:57 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: from mxrelay.nyi.freebsd.org (mxrelay.nyi.freebsd.org [IPv6:2610:1c1:1:606c::19:3]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) server-signature RSA-PSS (4096 bits) client-signature RSA-PSS (4096 bits) client-digest SHA256) (Client CN "mxrelay.nyi.freebsd.org", Issuer "Let's Encrypt Authority X3" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 481LhY2hckz47cd for ; Mon, 20 Jan 2020 06:03:57 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: from kenobi.freebsd.org (kenobi.freebsd.org [IPv6:2610:1c1:1:606c::50:1d]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by mxrelay.nyi.freebsd.org (Postfix) with ESMTPS id 57EE81F349 for ; Mon, 20 Jan 2020 06:03:57 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: from kenobi.freebsd.org ([127.0.1.5]) by kenobi.freebsd.org (8.15.2/8.15.2) with ESMTP id 00K63vDQ069665 for ; Mon, 20 Jan 2020 06:03:57 GMT (envelope-from bugzilla-noreply@freebsd.org) Received: (from www@localhost) by kenobi.freebsd.org (8.15.2/8.15.2/Submit) id 00K63vxU069664 for virtualization@FreeBSD.org; Mon, 20 Jan 2020 06:03:57 GMT (envelope-from bugzilla-noreply@freebsd.org) X-Authentication-Warning: kenobi.freebsd.org: www set sender to bugzilla-noreply@freebsd.org using -f From: bugzilla-noreply@freebsd.org To: virtualization@FreeBSD.org Subject: [Bug 236922] Virtio fails as QEMU-KVM guest with Q35 chipset on Ubuntu 18.04.2 LTS Date: Mon, 20 Jan 2020 06:03:57 +0000 X-Bugzilla-Reason: AssignedTo X-Bugzilla-Type: changed X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: Base System X-Bugzilla-Component: kern X-Bugzilla-Version: 12.0-RELEASE X-Bugzilla-Keywords: needs-qa X-Bugzilla-Severity: Affects Some People X-Bugzilla-Who: tommyhp2@gmail.com X-Bugzilla-Status: Open X-Bugzilla-Resolution: X-Bugzilla-Priority: --- X-Bugzilla-Assigned-To: virtualization@FreeBSD.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://bugs.freebsd.org/bugzilla/ Auto-Submitted: auto-generated MIME-Version: 1.0 X-BeenThere: freebsd-virtualization@freebsd.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "Discussion of various virtualization techniques FreeBSD supports." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 20 Jan 2020 06:03:57 -0000 https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D236922 --- Comment #51 from Tommy P --- (In reply to John Hartley from comment #47) Hi John, Before making the patch for disabling VirtIO + netmap interop, I thought of possible scenarios: 1) netmap w/o VirtIO 2) netmap + VirtIO interop 3) VirtIO w/o netmap For 1 & 3, disabling in the kernel, IMO, is the best approach over all. Th= us, no need for any change in the code. As for 2, netmap currently doesn't ful= ly supports PCI-e. Thus, the approach I took is what I think is best (kernel compile time, kernel size, least time spent of making a patch that works wh= ich was less than 5 minutes, easier future code adaptation to Vincenzo's change= s of netmap). This would allow both netmap and VirtIO to work in conjunction ex= cept netmap + VirtIO NIC. As for QEMU 4.0+ versus older versions (comment #50), I think it may come d= own to compatibility matrix between FreeBSD vs QEMU versions. I previously had problems booting older versions of FreeBSD when I specify CPU model Opterio= n_G4 or Opteron_G5 within QEMU/KVM configuration. Now, I can run both 11 & 12 w= ith Opteron_G5. If you think as a developer/programmer and consider the SDLC, would you want to make something that's constantly changing or something th= at's stable? For those reasons, I stopped using non LTS for Ubuntu a couple of years ago because the downstream needs time in accordance with SDLC to upda= te for the changes. Regards, Tommy --=20 You are receiving this mail because: You are the assignee for the bug.=