From 5986edadff53075f4bb5fe419514962c96f9faf6 Mon Sep 17 00:00:00 2001 From: Marc Jones Date: Thu, 25 Oct 2012 09:37:19 -0600 Subject: Revert "Remove code that enables/disables VMX in coreboot on chromebooks." The MSR for VMX can start with a random value and needs to be cleared by coreboot. I am reverting this change, as it handles almost everything and doing a follow-on change to fix the improper clearing of the MSR. Change-Id: Ibad7a27b03f199241c52c1ebdd2b6d4e81a18a4e Signed-off-by: Marc Jones Reviewed-on: http://review.coreboot.org/1793 Tested-by: build bot (Jenkins) Reviewed-by: Stefan Reinauer --- src/cpu/intel/model_206ax/model_206ax_init.c | 38 ++++++++++++++++++++++++++++ 1 file changed, 38 insertions(+) (limited to 'src/cpu/intel/model_206ax/model_206ax_init.c') diff --git a/src/cpu/intel/model_206ax/model_206ax_init.c b/src/cpu/intel/model_206ax/model_206ax_init.c index 9654af14c5..47c7707548 100644 --- a/src/cpu/intel/model_206ax/model_206ax_init.c +++ b/src/cpu/intel/model_206ax/model_206ax_init.c @@ -116,6 +116,41 @@ static acpi_cstate_t cstate_map[] = { { 0 } }; +static void enable_vmx(void) +{ + struct cpuid_result regs; + msr_t msr; + int enable = CONFIG_ENABLE_VMX; + + msr = rdmsr(IA32_FEATURE_CONTROL); + + if (msr.lo & (1 << 0)) { + printk(BIOS_ERR, "VMX is locked, so enable_vmx will do nothing\n"); + /* VMX locked. If we set it again we get an illegal + * instruction + */ + return; + } + + regs = cpuid(1); + printk(BIOS_DEBUG, "%s VMX\n", enable ? "Enabling" : "Disabling"); + if (regs.ecx & CPUID_VMX) { + if (enable) + msr.lo |= (1 << 2); + else + msr.lo &= ~(1 << 2); + + if (regs.ecx & CPUID_SMX) { + if (enable) + msr.lo |= (1 << 1); + else + msr.lo &= ~(1 << 1); + } + } + + 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, @@ -526,6 +561,9 @@ static void model_206ax_init(device_t cpu) enable_lapic_tpr(); setup_lapic(); + /* Enable virtualization if enabled in CMOS */ + enable_vmx(); + /* Configure C States */ configure_c_states(); -- cgit v1.2.3