3.16.66-rc1 review patch. If anyone has any objections, please let me know.
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From: Vitaly Kuznetsov vkuznets@redhat.com
commit 6b1971c694975e49af302229202c0043568b1791 upstream.
SDM says MSR_IA32_VMX_PROCBASED_CTLS2 is only available "If (CPUID.01H:ECX.[5] && IA32_VMX_PROCBASED_CTLS[63])". It was found that some old cpus (namely "Intel(R) Core(TM)2 CPU 6600 @ 2.40GHz (family: 0x6, model: 0xf, stepping: 0x6") don't have it. Add the missing check.
Reported-by: Zdenek Kaspar zkaspar82@gmail.com Tested-by: Zdenek Kaspar zkaspar82@gmail.com Signed-off-by: Vitaly Kuznetsov vkuznets@redhat.com Reviewed-by: Jim Mattson jmattson@google.com Signed-off-by: Paolo Bonzini pbonzini@redhat.com [bwh: Backported to 3.16: - The MSR values are stored in static variables - Adjust filename] Signed-off-by: Ben Hutchings ben@decadent.org.uk --- --- a/arch/x86/kvm/vmx.c +++ b/arch/x86/kvm/vmx.c @@ -2320,8 +2320,11 @@ static __init void nested_vmx_setup_ctls nested_vmx_procbased_ctls_high |= CPU_BASED_USE_MSR_BITMAPS;
/* secondary cpu-based controls */ - rdmsr(MSR_IA32_VMX_PROCBASED_CTLS2, - nested_vmx_secondary_ctls_low, nested_vmx_secondary_ctls_high); + if (nested_vmx_procbased_ctls_high & CPU_BASED_ACTIVATE_SECONDARY_CONTROLS) + rdmsr(MSR_IA32_VMX_PROCBASED_CTLS2, + nested_vmx_secondary_ctls_low, + nested_vmx_secondary_ctls_high); + nested_vmx_secondary_ctls_low = 0; nested_vmx_secondary_ctls_high &= SECONDARY_EXEC_VIRTUALIZE_APIC_ACCESSES |