From owner-freebsd-bugs@freebsd.org Wed Jan 16 20:46:19 2019 Return-Path: Delivered-To: freebsd-bugs@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id 8410C1494E8D for ; Wed, 16 Jan 2019 20:46:19 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: from mailman.ysv.freebsd.org (mailman.ysv.freebsd.org [IPv6:2001:1900:2254:206a::50:5]) by mx1.freebsd.org (Postfix) with ESMTP id 0025B86D5D for ; Wed, 16 Jan 2019 20:46:19 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: by mailman.ysv.freebsd.org (Postfix) id AF2A01494E8B; Wed, 16 Jan 2019 20:46:18 +0000 (UTC) Delivered-To: bugs@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id 8CA631494E8A for ; Wed, 16 Jan 2019 20:46:18 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: from mxrelay.ysv.freebsd.org (mxrelay.ysv.freebsd.org [IPv6:2001:1900:2254:206a::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.ysv.freebsd.org", Issuer "Let's Encrypt Authority X3" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 29D2086D5A for ; Wed, 16 Jan 2019 20:46:18 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: from kenobi.freebsd.org (kenobi.freebsd.org [IPv6:2001:1900:2254:206a::16:76]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by mxrelay.ysv.freebsd.org (Postfix) with ESMTPS id 66E7B9ADB for ; Wed, 16 Jan 2019 20:46:17 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: from kenobi.freebsd.org ([127.0.1.118]) by kenobi.freebsd.org (8.15.2/8.15.2) with ESMTP id x0GKkHgr006270 for ; Wed, 16 Jan 2019 20:46:17 GMT (envelope-from bugzilla-noreply@freebsd.org) Received: (from www@localhost) by kenobi.freebsd.org (8.15.2/8.15.2/Submit) id x0GKkHtd006269 for bugs@FreeBSD.org; Wed, 16 Jan 2019 20:46:17 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: bugs@FreeBSD.org Subject: [Bug 235010] bhyve: Linux guest crash due to unhandled MSR Date: Wed, 16 Jan 2019 20:46:17 +0000 X-Bugzilla-Reason: AssignedTo X-Bugzilla-Type: new X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: Base System X-Bugzilla-Component: kern X-Bugzilla-Version: 12.0-RELEASE X-Bugzilla-Keywords: bhyve X-Bugzilla-Severity: Affects Some People X-Bugzilla-Who: rys@sommefeldt.com X-Bugzilla-Status: New X-Bugzilla-Resolution: X-Bugzilla-Priority: --- X-Bugzilla-Assigned-To: bugs@FreeBSD.org X-Bugzilla-Flags: X-Bugzilla-Changed-Fields: bug_id short_desc product version rep_platform op_sys bug_status keywords bug_severity priority component assigned_to reporter attachments.created Message-ID: 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-bugs@freebsd.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Bug reports List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 16 Jan 2019 20:46:19 -0000 https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D235010 Bug ID: 235010 Summary: bhyve: Linux guest crash due to unhandled MSR Product: Base System Version: 12.0-RELEASE Hardware: amd64 OS: Any Status: New Keywords: bhyve Severity: Affects Some People Priority: --- Component: kern Assignee: bugs@FreeBSD.org Reporter: rys@sommefeldt.com Created attachment 201198 --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=3D201198&action= =3Dedit Bad boot due to unhandled Spectre v2 MSR bhyve in FreeBSD 12.0-RELEASE can't run certain Linux guests on certain AMD processors due to an unhandled MSR related to the Spectre v2 mitigation pre= sent in modern Linux kernels. Use of the -w switch lets at least certain guests run properly. The MSR is 0x49, and the bhyve log shows the guest attempting to set it to = 0x1. I've attached logs from a single vCPU configuration attempting to run Debian 9.6.0. debian9-1vCPU.log is from a run without -w debian9-1vCPU-ignore-unimplemented-msr.log is from a run with -w This LKML thread has more information on how it relates to Spectre v2 mitigation: https://lkml.org/lkml/2019/1/3/540 I don't understand the interaction between the Linux kernel and the CPU as presented to the guest by bhyve, with regards to the microcode. It's possib= le my host system needs a microcode update delivered by the BIOS or FreeBSD somehow, but I'm out of my depth there. I'm able to get guests that support the Linux kernel's spectre_v2_user=3Doff kernel boot param to boot OK, without needing -w. Let me know if I can do more testing. I'm running an AMD Ryzen Threadripper 2990WX with AGESA firmware 1.1.0.1a as part of the BIOS. --=20 You are receiving this mail because: You are the assignee for the bug.=