From f5a11aa82f66a77a4b79b602604a8516ca187c3b Mon Sep 17 00:00:00 2001 From: Marc Jones Date: Thu, 25 Oct 2012 14:01:37 -0600 Subject: [PATCH] Initialize the VMX MSR The VMX MSR may come up with random values and needs to be initialized to zero. This was done incorrectly in finalize_smm. It must be done on a per core basis in the general CPU init. This touches all Sandybridge and Ivybridge configs. Change-Id: I015352d0f8e2ebe55ac0a5e9c5bbff83bd2ff86b Signed-off-by: Marc Jones Reviewed-on: http://review.coreboot.org/1794 Tested-by: build bot (Jenkins) Reviewed-by: Stefan Reinauer --- src/cpu/intel/model_206ax/finalize.c | 1 - src/cpu/intel/model_206ax/model_206ax_init.c | 28 +++++++++++--------- 2 files changed, 15 insertions(+), 14 deletions(-) diff --git a/src/cpu/intel/model_206ax/finalize.c b/src/cpu/intel/model_206ax/finalize.c index ca7048d50b..4ed5d1e5f8 100644 --- a/src/cpu/intel/model_206ax/finalize.c +++ b/src/cpu/intel/model_206ax/finalize.c @@ -43,7 +43,6 @@ static void msr_set_bit(unsigned reg, unsigned bit) void intel_model_206ax_finalize_smm(void) { - msr_set_bit(IA32_FEATURE_CONTROL, 0); msr_set_bit(MSR_PMG_CST_CONFIG_CONTROL, 15); /* Lock AES-NI only if supported */ diff --git a/src/cpu/intel/model_206ax/model_206ax_init.c b/src/cpu/intel/model_206ax/model_206ax_init.c index 47c7707548..bcd68657e0 100644 --- a/src/cpu/intel/model_206ax/model_206ax_init.c +++ b/src/cpu/intel/model_206ax/model_206ax_init.c @@ -122,30 +122,32 @@ static void enable_vmx(void) msr_t msr; int enable = 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 enable_vmx will do nothing\n"); + 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; } - 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); + /* 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 (regs.ecx & CPUID_SMX) { - if (enable) + printk(BIOS_DEBUG, "%s VMX\n", enable ? "Enabling" : "Disabling"); + + if (enable) { + msr.lo |= (1 << 2); + if (regs.ecx & CPUID_SMX) msr.lo |= (1 << 1); - else - msr.lo &= ~(1 << 1); - } } wrmsr(IA32_FEATURE_CONTROL, msr);