KVM: nVMX: Preset *DT exiting in vmcs02 when emulating UMIP

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KVM dynamically toggles SECONDARY_EXEC_DESC to intercept (a subset of)
instructions that are subject to User-Mode Instruction Prevention, i.e.
VMCS.SECONDARY_EXEC_DESC == CR4.UMIP when emulating UMIP.  Preset the
VMCS control when preparing vmcs02 to avoid unnecessarily VMWRITEs,
e.g. KVM will clear VMCS.SECONDARY_EXEC_DESC in prepare_vmcs02_early()
and then set it in vmx_set_cr4().

Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

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Sean Christopherson 2019-05-07 12:18:02 -07:00 • committed by Paolo Bonzini

parent de0286b788

commit 469debdb8b

1 changed files with 8 additions and 0 deletions

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arch/x86/kvm/vmx/nested.c

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