From ed6fe2f64b37d0c6161b23b20980f91e0be7a1ea Mon Sep 17 00:00:00 2001 From: Matt DeVillier Date: Wed, 14 Dec 2016 16:12:43 -0600 Subject: cpu/intel/common: Add/Use common function to set virtualization Migrate duplicated enable_vmx() method from multiple CPUs to common folder. Add common virtualization option for CPUs which support it. Note that this changes the default to enable virtualization on CPUs that support it. Change-Id: Ib110bed6c9f5508e3f867dcdc6f341fc50e501d1 Signed-off-by: Matt DeVillier Reviewed-on: https://review.coreboot.org/17874 Reviewed-by: Nico Huber Tested-by: build bot (Jenkins) --- src/cpu/intel/common/common_init.c | 71 ++++++++++++++++++++++++++++++++++++++ 1 file changed, 71 insertions(+) create mode 100644 src/cpu/intel/common/common_init.c (limited to 'src/cpu/intel/common/common_init.c') diff --git a/src/cpu/intel/common/common_init.c b/src/cpu/intel/common/common_init.c new file mode 100644 index 0000000000..da7b82651f --- /dev/null +++ b/src/cpu/intel/common/common_init.c @@ -0,0 +1,71 @@ +/* + * This file is part of the coreboot project. + * + * Copyright (C) 2007-2009 coresystems GmbH + * Copyright (C) 2011 The ChromiumOS Authors. All rights reserved. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License as + * published by the Free Software Foundation; version 2 of + * the License. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + */ + +#include +#include +#include "common.h" + +#define IA32_FEATURE_CONTROL 0x3a +#define CPUID_VMX (1 << 5) +#define CPUID_SMX (1 << 6) + +void set_vmx(void) +{ + struct cpuid_result regs; + msr_t msr; + int enable = IS_ENABLED(CONFIG_ENABLE_VMX); + int lock = IS_ENABLED(CONFIG_SET_VMX_LOCK_BIT); + + regs = cpuid(1); + /* Check that the VMX is supported before reading or writing the MSR. */ + if (!((regs.ecx & CPUID_VMX) || (regs.ecx & CPUID_SMX))) { + printk(BIOS_DEBUG, "CPU doesn't support VMX; exiting\n"); + return; + } + + msr = rdmsr(IA32_FEATURE_CONTROL); + + if (msr.lo & (1 << 0)) { + printk(BIOS_ERR, "VMX is locked, so %s will do nothing\n", __func__); + /* VMX locked. If we set it again we get an illegal + * instruction + */ + return; + } + + /* The IA32_FEATURE_CONTROL MSR may initialize with random values. + * It must be cleared regardless of VMX config setting. + */ + msr.hi = msr.lo = 0; + + if (enable) { + msr.lo |= (1 << 2); + if (regs.ecx & CPUID_SMX) + msr.lo |= (1 << 1); + } + + wrmsr(IA32_FEATURE_CONTROL, msr); + + if (lock) { + /* Set lock bit */ + msr.lo |= (1 << 0); + wrmsr(IA32_FEATURE_CONTROL, msr); + } + + printk(BIOS_DEBUG, "VMX status: %s, %s\n", enable ? "enabled" : "disabled", + lock ? "locked" : "unlocked"); +} -- cgit v1.2.3