KVM: vmx: skip VMWRITE of HOST_{FS,GS}_SEL when possible

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On a 64-bit host, FS.sel and GS.sel are all but guaranteed to be 0,
which in turn means they'll rarely change.  Skip the VMWRITE for the
associated VMCS fields when loading host state if the selector hasn't
changed since the last VMWRITE.

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

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Sean Christopherson 2018-07-23 12:32:49 -07:00 • committed by Paolo Bonzini

parent f3bbc0dced

commit 8f21a0bbf3

1 changed files with 14 additions and 10 deletions

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arch/x86/kvm/vmx.c

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