KVM: VMX: Use VMX feature flag to query BIOS enabling

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Replace KVM's manual checks on IA32_FEAT_CTL with a query on the boot
CPU's MSR_IA32_FEAT_CTL and VMX feature flags.  The MSR_IA32_FEAT_CTL
indicates that IA32_FEAT_CTL has been configured and that dependent
features are accurately reflected in cpufeatures, e.g. the VMX flag is
now cleared during boot if VMX isn't fully enabled via IA32_FEAT_CTL,
including the case where the MSR isn't supported.

Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Link: https://lkml.kernel.org/r/20191221044513.21680-16-sean.j.christopherson@intel.com

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Sean Christopherson 2019-12-20 20:45:09 -08:00 • committed by Borislav Petkov

parent 21bd3467a5

commit a4d0b2fdbc

1 changed files with 2 additions and 25 deletions

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arch/x86/kvm/vmx/vmx.c

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