From patchwork Thu Jun 16 06:06:21 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Haozhong Zhang X-Patchwork-Id: 9179861 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id CBA9760573 for ; Thu, 16 Jun 2016 06:06:47 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id BCE2927BF7 for ; Thu, 16 Jun 2016 06:06:47 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id B19CB27F07; Thu, 16 Jun 2016 06:06:47 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.9 required=2.0 tests=BAYES_00,RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 5A0AC27BF7 for ; Thu, 16 Jun 2016 06:06:47 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753810AbcFPGGl (ORCPT ); Thu, 16 Jun 2016 02:06:41 -0400 Received: from mga14.intel.com ([192.55.52.115]:21382 "EHLO mga14.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753797AbcFPGGj (ORCPT ); Thu, 16 Jun 2016 02:06:39 -0400 Received: from fmsmga001.fm.intel.com ([10.253.24.23]) by fmsmga103.fm.intel.com with ESMTP; 15 Jun 2016 23:06:39 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.26,478,1459839600"; d="scan'208";a="988537766" Received: from hz-desktop.sh.intel.com (HELO localhost) ([10.239.13.126]) by fmsmga001.fm.intel.com with ESMTP; 15 Jun 2016 23:06:38 -0700 From: Haozhong Zhang To: qemu-devel@nongnu.org Cc: Paolo Bonzini , Richard Henderson , Eduardo Habkost , "Michael S . Tsirkin" , Marcelo Tosatti , kvm@vger.kernel.org, Boris Petkov , Tony Luck , Andi Kleen , rkrcmar@redhat.com, Ashok Raj , Haozhong Zhang Subject: [PATCH v4 3/3] i386: publish advised value of MSR_IA32_FEATURE_CONTROL via fw_cfg Date: Thu, 16 Jun 2016 14:06:21 +0800 Message-Id: <20160616060621.30422-4-haozhong.zhang@intel.com> X-Mailer: git-send-email 2.9.0 In-Reply-To: <20160616060621.30422-1-haozhong.zhang@intel.com> References: <20160616060621.30422-1-haozhong.zhang@intel.com> Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP It's a prerequisite that certain bits of MSR_IA32_FEATURE_CONTROL should be set before some features (e.g. VMX and LMCE) can be used, which is usually done by the firmware. This patch adds a fw_cfg file "etc/msr_feature_control" which contains the advised value of MSR_IA32_FEATURE_CONTROL and can be used by guest firmware (e.g. SeaBIOS). Suggested-by: Paolo Bonzini Signed-off-by: Haozhong Zhang Reviewed-by: Paolo Bonzini --- hw/i386/pc.c | 28 ++++++++++++++++++++++++++++ target-i386/cpu.h | 4 ++++ 2 files changed, 32 insertions(+) diff --git a/hw/i386/pc.c b/hw/i386/pc.c index 7198ed5..d8178a5 100644 --- a/hw/i386/pc.c +++ b/hw/i386/pc.c @@ -1147,6 +1147,33 @@ void pc_cpus_init(PCMachineState *pcms) smbios_set_cpuid(cpu->env.cpuid_version, cpu->env.features[FEAT_1_EDX]); } +static void pc_build_feature_control_file(PCMachineState *pcms) +{ + X86CPU *cpu = X86_CPU(pcms->possible_cpus->cpus[0].cpu); + CPUX86State *env = &cpu->env; + uint32_t unused, ecx, edx, feature_control_bits = 0; + uint32_t *val; + + cpu_x86_cpuid(env, 1, 0, &unused, &unused, &ecx, &edx); + if (ecx & CPUID_EXT_VMX) { + feature_control_bits |= FEATURE_CONTROL_VMXON_ENABLED_OUTSIDE_SMX; + } + + if ((edx & (CPUID_EXT2_MCE | CPUID_EXT2_MCA)) == + (CPUID_EXT2_MCE | CPUID_EXT2_MCA) && + (env->mcg_cap & MCG_LMCE_P)) { + feature_control_bits |= FEATURE_CONTROL_LMCE; + } + + if (!feature_control_bits) { + return; + } + + val = g_malloc(sizeof(*val)); + *val = feature_control_bits | FEATURE_CONTROL_LOCKED; + fw_cfg_add_file(pcms->fw_cfg, "etc/msr_feature_control", val, sizeof(*val)); +} + static void pc_machine_done(Notifier *notifier, void *data) { @@ -1174,6 +1201,7 @@ void pc_machine_done(Notifier *notifier, void *data) acpi_setup(); if (pcms->fw_cfg) { pc_build_smbios(pcms->fw_cfg); + pc_build_feature_control_file(pcms); } } diff --git a/target-i386/cpu.h b/target-i386/cpu.h index f0cb04f..5e07c7a 100644 --- a/target-i386/cpu.h +++ b/target-i386/cpu.h @@ -332,6 +332,10 @@ #define MSR_TSC_ADJUST 0x0000003b #define MSR_IA32_TSCDEADLINE 0x6e0 +#define FEATURE_CONTROL_LOCKED (1<<0) +#define FEATURE_CONTROL_VMXON_ENABLED_OUTSIDE_SMX (1<<2) +#define FEATURE_CONTROL_LMCE (1<<20) + #define MSR_P6_PERFCTR0 0xc1 #define MSR_IA32_SMBASE 0x9e