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KVM: x86: MMU: Move handle_mmio_page_fault() call to kvm_mmu_page_fault()
Rather than placing a handle_mmio_page_fault() call in each
vcpu->arch.mmu.page_fault() handler, moving it up to
kvm_mmu_page_fault() makes the code better:
- avoids code duplication
- for kvm_arch_async_page_ready(), which is the other caller of
vcpu->arch.mmu.page_fault(), removes an extra error_code check
- avoids returning both RET_MMIO_PF_* values and raw integer values
from vcpu->arch.mmu.page_fault()
Signed-off-by: Takuya Yoshikawa <yoshikawa_takuya_b1@lab.ntt.co.jp>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>