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/*
* This file is part of the coreboot project.
*
* 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 <console/console.h>
#include <cpu/x86/msr.h>
#include <intelblocks/msr.h>
#include <intelblocks/vmx.h>
#include <soc/cpu.h>
#include <string.h>
static bool vmx_param_valid;
static struct vmx_param g_vmx_param;
static const struct vmx_param *get_vmx_param(void)
{
if (vmx_param_valid)
return &g_vmx_param;
memset(&g_vmx_param, 0, sizeof(g_vmx_param));
if (soc_fill_vmx_param(&g_vmx_param) < 0) {
printk(BIOS_ERR, "VMX : Failed to get soc vmx param\n");
return NULL;
}
vmx_param_valid = true;
printk(BIOS_INFO, "VMX : param.enable = %d\n", g_vmx_param.enable);
return &g_vmx_param;
}
static int soc_vmx_enabled(void)
{
const struct vmx_param *vmx_param = get_vmx_param();
return vmx_param ? vmx_param->enable : 0;
}
void vmx_configure(void *unused)
{
msr_t msr;
struct cpuid_result regs;
regs = cpuid(1);
if (!soc_vmx_enabled() || !(regs.ecx & CPUID_VMX)) {
printk(BIOS_ERR, "VMX: pre-conditions not met\n");
return;
}
msr = rdmsr(IA32_FEATURE_CONTROL);
/* Only enable it when it is not locked */
if ((msr.lo & FEATURE_CONTROL_LOCK_BIT) == 0) {
/* Enable VMX */
msr.lo |= FEATURE_ENABLE_VMX;
wrmsr(IA32_FEATURE_CONTROL, msr);
}
/* Report current status */
msr = rdmsr(IA32_FEATURE_CONTROL);
printk(BIOS_DEBUG, "VMX status: %s, %s\n",
(msr.lo & FEATURE_ENABLE_VMX) ? "enabled" : "disabled",
(msr.lo & FEATURE_CONTROL_LOCK_BIT) ? "locked" : "unlocked");
}
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