From owner-svn-src-projects@FreeBSD.ORG Sat Jun 7 23:05:13 2014 Return-Path: Delivered-To: svn-src-projects@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [8.8.178.115]) (using TLSv1 with cipher ADH-AES256-SHA (256/256 bits)) (No client certificate requested) by hub.freebsd.org (Postfix) with ESMTPS id 5D5C4D4; Sat, 7 Jun 2014 23:05:13 +0000 (UTC) Received: from svn.freebsd.org (svn.freebsd.org [IPv6:2001:1900:2254:2068::e6a:0]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by mx1.freebsd.org (Postfix) with ESMTPS id 4A7A52B47; Sat, 7 Jun 2014 23:05:13 +0000 (UTC) Received: from svn.freebsd.org ([127.0.1.70]) by svn.freebsd.org (8.14.8/8.14.8) with ESMTP id s57N5C0V081594; Sat, 7 Jun 2014 23:05:12 GMT (envelope-from grehan@svn.freebsd.org) Received: (from grehan@localhost) by svn.freebsd.org (8.14.8/8.14.8/Submit) id s57N5COl081593; Sat, 7 Jun 2014 23:05:12 GMT (envelope-from grehan@svn.freebsd.org) Message-Id: <201406072305.s57N5COl081593@svn.freebsd.org> From: Peter Grehan Date: Sat, 7 Jun 2014 23:05:12 +0000 (UTC) To: src-committers@freebsd.org, svn-src-projects@freebsd.org Subject: svn commit: r267217 - projects/bhyve_svm/sys/amd64/vmm/amd X-SVN-Group: projects MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-BeenThere: svn-src-projects@freebsd.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: "SVN commit messages for the src " projects" tree" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 07 Jun 2014 23:05:13 -0000 Author: grehan Date: Sat Jun 7 23:05:12 2014 New Revision: 267217 URL: http://svnweb.freebsd.org/changeset/base/267217 Log: Set the guest PAT MSR in the VMCB to power-on defaults. Linux guests accept the values in this register, while *BSD guests reprogram it. Default values of zero correspond to PAT_UNCACHEABLE, resulting in glacial performance. Thanks to Willem Jan Withagen for first reporting this and helping out with the investigation. Modified: projects/bhyve_svm/sys/amd64/vmm/amd/vmcb.c Modified: projects/bhyve_svm/sys/amd64/vmm/amd/vmcb.c ============================================================================== --- projects/bhyve_svm/sys/amd64/vmm/amd/vmcb.c Sat Jun 7 21:36:52 2014 (r267216) +++ projects/bhyve_svm/sys/amd64/vmm/amd/vmcb.c Sat Jun 7 23:05:12 2014 (r267217) @@ -67,10 +67,20 @@ svm_init_vmcb(struct vmcb *vmcb, uint64_ /* Enable nested paging */ ctrl->np_enable = 1; ctrl->n_cr3 = np_pml4; - + /* EFER_SVM must always be set when the guest is executing */ state->efer = EFER_SVM; - + + /* Set up the PAT to power-on state */ + state->g_pat = PAT_VALUE(0, PAT_WRITE_BACK) | + PAT_VALUE(1, PAT_WRITE_THROUGH) | + PAT_VALUE(2, PAT_UNCACHED) | + PAT_VALUE(3, PAT_UNCACHEABLE) | + PAT_VALUE(4, PAT_WRITE_BACK) | + PAT_VALUE(5, PAT_WRITE_THROUGH) | + PAT_VALUE(6, PAT_UNCACHED) | + PAT_VALUE(7, PAT_UNCACHEABLE); + return (0); }