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Wrap the combination of mmu->invlpg and kvm_x86_ops->tlb_flush_gva
into a new function. This function also lets us specify the host PGD to
invalidate and also the MMU, both of which will be useful in fixing and
simplifying kvm_inject_emulated_page_fault.
A nested guest's MMU however has g_context->invlpg == NULL. Instead of
setting it to nonpaging_invlpg, make kvm_mmu_invalidate_gva the only
entry point to mmu->invlpg and make a NULL invlpg pointer equivalent
to nonpaging_invlpg, saving a retpoline.
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
5efac0741c