From owner-svn-src-all@FreeBSD.ORG Thu Jun 4 02:12:24 2015 Return-Path: Delivered-To: svn-src-all@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [8.8.178.115]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by hub.freebsd.org (Postfix) with ESMTPS id 51BBF5A0; Thu, 4 Jun 2015 02:12:24 +0000 (UTC) (envelope-from neel@FreeBSD.org) 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 25BDF11B9; Thu, 4 Jun 2015 02:12:24 +0000 (UTC) (envelope-from neel@FreeBSD.org) Received: from svn.freebsd.org ([127.0.1.70]) by svn.freebsd.org (8.14.9/8.14.9) with ESMTP id t542COjY036510; Thu, 4 Jun 2015 02:12:24 GMT (envelope-from neel@FreeBSD.org) Received: (from neel@localhost) by svn.freebsd.org (8.14.9/8.14.9/Submit) id t542CO4N036509; Thu, 4 Jun 2015 02:12:24 GMT (envelope-from neel@FreeBSD.org) Message-Id: <201506040212.t542CO4N036509@svn.freebsd.org> X-Authentication-Warning: svn.freebsd.org: neel set sender to neel@FreeBSD.org using -f From: Neel Natu Date: Thu, 4 Jun 2015 02:12:24 +0000 (UTC) To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r283973 - head/sys/amd64/vmm/amd X-SVN-Group: head MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-BeenThere: svn-src-all@freebsd.org X-Mailman-Version: 2.1.20 Precedence: list List-Id: "SVN commit messages for the entire src tree \(except for " user" and " projects" \)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 04 Jun 2015 02:12:24 -0000 Author: neel Date: Thu Jun 4 02:12:23 2015 New Revision: 283973 URL: https://svnweb.freebsd.org/changeset/base/283973 Log: Use tunable 'hw.vmm.svm.features' to disable specific SVM features even though they might be available in hardware. Use tunable 'hw.vmm.svm.num_asids' to limit the number of ASIDs used by the hypervisor. MFC after: 1 week Modified: head/sys/amd64/vmm/amd/svm.c Modified: head/sys/amd64/vmm/amd/svm.c ============================================================================== --- head/sys/amd64/vmm/amd/svm.c Thu Jun 4 01:52:17 2015 (r283972) +++ head/sys/amd64/vmm/amd/svm.c Thu Jun 4 02:12:23 2015 (r283973) @@ -102,8 +102,8 @@ static MALLOC_DEFINE(M_SVM_VLAPIC, "svm- /* Per-CPU context area. */ extern struct pcpu __pcpu[]; -static uint32_t svm_feature; /* AMD SVM features. */ -SYSCTL_UINT(_hw_vmm_svm, OID_AUTO, features, CTLFLAG_RD, &svm_feature, 0, +static uint32_t svm_feature = ~0U; /* AMD SVM features. */ +SYSCTL_UINT(_hw_vmm_svm, OID_AUTO, features, CTLFLAG_RDTUN, &svm_feature, 0, "SVM features advertised by CPUID.8000000AH:EDX"); static int disable_npf_assist; @@ -112,7 +112,7 @@ SYSCTL_INT(_hw_vmm_svm, OID_AUTO, disabl /* Maximum ASIDs supported by the processor */ static uint32_t nasid; -SYSCTL_UINT(_hw_vmm_svm, OID_AUTO, num_asids, CTLFLAG_RD, &nasid, 0, +SYSCTL_UINT(_hw_vmm_svm, OID_AUTO, num_asids, CTLFLAG_RDTUN, &nasid, 0, "Number of ASIDs supported by this processor"); /* Current ASID generation for each host cpu */ @@ -174,9 +174,14 @@ check_svm_features(void) /* CPUID Fn8000_000A is for SVM */ do_cpuid(0x8000000A, regs); - svm_feature = regs[3]; + svm_feature &= regs[3]; - nasid = regs[1]; + /* + * The number of ASIDs can be configured to be less than what is + * supported by the hardware but not more. + */ + if (nasid == 0 || nasid > regs[1]) + nasid = regs[1]; KASSERT(nasid > 1, ("Insufficient ASIDs for guests: %#x", nasid)); /* bhyve requires the Nested Paging feature */