diff options
| -rw-r--r-- | src/cpu/intel/haswell/Kconfig | 4 | ||||
| -rw-r--r-- | src/cpu/intel/haswell/haswell_init.c | 44 |
2 files changed, 48 insertions, 0 deletions
diff --git a/src/cpu/intel/haswell/Kconfig b/src/cpu/intel/haswell/Kconfig index 9cda140657..9e62ae50ac 100644 --- a/src/cpu/intel/haswell/Kconfig +++ b/src/cpu/intel/haswell/Kconfig @@ -34,6 +34,10 @@ config SMM_TSEG_SIZE hex default 0x800000 +config ENABLE_VMX + bool "Enable VMX for virtualization" + default n + config IED_REGION_SIZE hex default 0x400000 diff --git a/src/cpu/intel/haswell/haswell_init.c b/src/cpu/intel/haswell/haswell_init.c index 9fa9b48fe4..043ba3a580 100644 --- a/src/cpu/intel/haswell/haswell_init.c +++ b/src/cpu/intel/haswell/haswell_init.c @@ -150,6 +150,47 @@ static acpi_cstate_t cstate_map[NUM_C_STATES] = { }, }; +static void enable_vmx(void) +{ + struct cpuid_result regs; + msr_t msr; + int enable = IS_ENABLED(CONFIG_ENABLE_VMX); + + regs = cpuid(1); + /* Check that the VMX is supported before reading or writing the MSR. */ + if (!((regs.ecx & CPUID_VMX) || (regs.ecx & CPUID_SMX))) + 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; + + printk(BIOS_DEBUG, "%s VMX\n", enable ? "Enabling" : "Disabling"); + + if (enable) { + msr.lo |= (1 << 2); + if (regs.ecx & CPUID_SMX) + msr.lo |= (1 << 1); + } + + wrmsr(IA32_FEATURE_CONTROL, msr); + + msr.lo |= (1 << 0); /* Set lock bit */ + + wrmsr(IA32_FEATURE_CONTROL, msr); +} + /* Convert time in seconds to POWER_LIMIT_1_TIME MSR value */ static const u8 power_limit_time_sec_to_msr[] = { [0] = 0x00, @@ -703,6 +744,9 @@ static void haswell_init(device_t cpu) enable_lapic_tpr(); setup_lapic(); + /* Enable virtualization if Kconfig option is set */ + enable_vmx(); + /* Configure C States */ configure_c_states(); |