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Bail from ppgtt_populate_shadow_entry() if an unexpected GTT entry type is encountered instead of subtly falling through to the common "direct shadow" path. Eliminating the default/error path's reliance on the common handling will allow hoisting intel_gvt_dma_map_guest_page() into the case statements so that the 2MiB case can try intel_gvt_dma_map_guest_page() and fallback to splitting the entry on failure. Reviewed-by: Zhi Wang <zhi.a.wang@intel.com> Tested-by: Yongwei Ma <yongwei.ma@intel.com> Reviewed-by: Yan Zhao <yan.y.zhao@intel.com> Link: https://lore.kernel.org/r/20230729013535.1070024-8-seanjc@google.com Signed-off-by: Sean Christopherson <seanjc@google.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>