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KVM: VMX: Check for full VMX support when verifying CPU compatibility 

Explicitly check the current CPU's IA32_FEAT_CTL and VMX feature flags
when verifying compatibility across physical CPUs.  This effectively
adds a check on IA32_FEAT_CTL to ensure that VMX is fully enabled on
all CPUs.

Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Link: https://lkml.kernel.org/r/20191221044513.21680-17-sean.j.christopherson@intel.com
This commit is contained in:
Sean Christopherson 2019-12-20 20:45:10 -08:00 committed by Borislav Petkov
parent a4d0b2fdbc
commit ff10e22e65
1 changed files with 6 additions and 0 deletions
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6
arch/x86/kvm/vmx/vmx.c
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@ -6838,6 +6838,12 @@ static int __init vmx_check_processor_compat(void)
struct vmcs_config vmcs_conf;
struct vmx_capability vmx_cap;
if (!this_cpu_has(X86_FEATURE_MSR_IA32_FEAT_CTL) ||
!this_cpu_has(X86_FEATURE_VMX)) {
pr_err("kvm: VMX is disabled on CPU %d\n", smp_processor_id());
return -EIO;
}
if (setup_vmcs_config(&vmcs_conf, &vmx_cap) < 0)
return -EIO;
if (nested)