KVM: nVMX: Don't reread VMCS-agnostic state when switching VMCS

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When switching between vmcs01 and vmcs02, there is no need to update
state tracking for values that aren't tied to any particular VMCS as
the per-vCPU values are already up-to-date (vmx_switch_vmcs() can only
be called when the vCPU is loaded).

Avoiding the update eliminates a RDMSR, and potentially a RDPKRU and
posted-interrupt update (cmpxchg64() and more).

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 09:06:32 -07:00 • committed by Paolo Bonzini

parent 13b964a29d

commit 8ef863e67a

3 changed files with 15 additions and 6 deletions

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2

arch/x86/kvm/vmx/nested.c

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arch/x86/kvm/vmx/vmx.c

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1

arch/x86/kvm/vmx/vmx.h

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