KVM: vmx: do not unconditionally clear EFER switching

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Do not unconditionally call clear_atomic_switch_msr() when updating
EFER.  This adds up to four unnecessary VMWrites in the case where
guest_efer != host_efer, e.g. if the load_on_{entry,exit} bits were
already set.

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

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Sean Christopherson 2018-09-26 09:23:43 -07:00 • committed by Paolo Bonzini

parent b7031fd40f

commit 02343cf207

1 changed files with 4 additions and 2 deletions

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arch/x86/kvm/vmx.c

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