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KVM: vmx: skip VMWRITE of HOST_{FS,GS}_SEL when possible
authorSean Christopherson <sean.j.christopherson@intel.com>
Mon, 23 Jul 2018 19:32:49 +0000 (12:32 -0700)
committerPaolo Bonzini <pbonzini@redhat.com>
Mon, 6 Aug 2018 15:59:16 +0000 (17:59 +0200)
commit8f21a0bbf36f58334695ae6e46c0cf906a217154
treee5eec36f1c8ed760755913d80ec90738c87a19e8tree | snapshot
parentf3bbc0dcedf50d29d2d6fdfb16c5ec3e2368837fcommit | diff
KVM: vmx: skip VMWRITE of HOST_{FS,GS}_SEL when possible

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>
arch/x86/kvm/vmx.c diff | blob | history
Domain: System / Kernel;