KVM: nVMX: Remove obsolete MSR bitmap refresh at nested transitions

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Drop unnecessary MSR bitmap updates during nested transitions, as L1's
APIC_BASE MSR is not modified by the standard VM-Enter/VM-Exit flows,
and L2's MSR bitmap is managed separately.  In the unlikely event that L1
is pathological and loads APIC_BASE via the VM-Exit load list, KVM will
handle updating the bitmap in its normal WRMSR flows.

Signed-off-by: Sean Christopherson <seanjc@google.com>
Message-Id: <20210713163324.627647-39-seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

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Sean Christopherson 2021-07-13 09:33:16 -07:00 • committed by Paolo Bonzini

parent 9e4784e19d

commit 284036c644

3 changed files with 1 additions and 8 deletions

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6

arch/x86/kvm/vmx/nested.c

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2

arch/x86/kvm/vmx/vmx.c

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1

arch/x86/kvm/vmx/vmx.h

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