KVM: X86: Update mmu->pdptrs only when it is changed
It is unchanged in most cases. Signed-off-by: Lai Jiangshan <laijs@linux.alibaba.com> Message-Id: <20211111144527.88852-1-jiangshanlai@gmail.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
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