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| author | Marc Jones <marc.jones@se-eng.com> | 2012-10-25 14:01:37 -0600 |
|---|---|---|
| committer | Stefan Reinauer <stefan.reinauer@coreboot.org> | 2012-11-12 03:27:58 +0100 |
| commit | f5a11aa82f66a77a4b79b602604a8516ca187c3b (patch) | |
| tree | 02cf32303de35712f906c1ea47429d0f45a937d4 /src/cpu/intel/model_206ax/model_206ax_init.c | |
| parent | 5986edadff53075f4bb5fe419514962c96f9faf6 (diff) | |
| download | coreboot-f5a11aa82f66a77a4b79b602604a8516ca187c3b.tar.xz | |
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 <marc.jones@se-eng.com>
Reviewed-on: http://review.coreboot.org/1794
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
Diffstat (limited to 'src/cpu/intel/model_206ax/model_206ax_init.c')
| -rw-r--r-- | src/cpu/intel/model_206ax/model_206ax_init.c | 26 |
1 files changed, 14 insertions, 12 deletions
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); + /* 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 (regs.ecx & CPUID_VMX) { - if (enable) - msr.lo |= (1 << 2); - else - msr.lo &= ~(1 << 2); - if (regs.ecx & CPUID_SMX) { - if (enable) + 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); |