x86/cpu: Clear VMX feature flag if VMX is not fully enabled

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Now that IA32_FEAT_CTL is always configured and locked for CPUs that are
known to support VMX[*], clear the VMX capability flag if the MSR is
unsupported or BIOS disabled VMX, i.e. locked IA32_FEAT_CTL and didn't
set the appropriate VMX enable bit.

[*] Because init_ia32_feat_ctl() is called from vendors ->c_init(), it's
    still possible for IA32_FEAT_CTL to be left unlocked when VMX is
    supported by the CPU.  This is not fatal, and will be addressed in a
    future patch.

Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Link: https://lkml.kernel.org/r/20191221044513.21680-9-sean.j.christopherson@intel.com

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Sean Christopherson 2019-12-20 20:45:02 -08:00 • committed by Borislav Petkov

parent 7d37953ba8

commit ef4d3bf198

1 changed files with 20 additions and 3 deletions

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arch/x86/kernel/cpu/feat_ctl.c

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