drm/i915/gvt: Explicitly check that vGPU is attached before shadowing

Move the check that a vGPU is attached from is_2MB_gtt_possible() all the
way up to shadow_ppgtt_mm() to avoid unnecessary work, and to make it more
obvious that a future cleanup of is_2MB_gtt_possible() isn't introducing a
bug.

is_2MB_gtt_possible() has only one caller, ppgtt_populate_shadow_entry(),
and all paths in ppgtt_populate_shadow_entry() eventually check for
attachment by way of intel_gvt_dma_map_guest_page().

And of the paths that lead to ppgtt_populate_shadow_entry(),
shadow_ppgtt_mm() is the only one that doesn't already check for
INTEL_VGPU_STATUS_ACTIVE or INTEL_VGPU_STATUS_ATTACHED.

  workload_thread() <= pick_next_workload() => INTEL_VGPU_STATUS_ACTIVE
  |
  -> dispatch_workload()
     |
     |-> prepare_workload()
         |
         -> intel_vgpu_sync_oos_pages()
         |  |
         |  |-> ppgtt_set_guest_page_sync()
         |      |
         |      |-> sync_oos_page()
         |          |
         |          |-> ppgtt_populate_shadow_entry()
         |
         |-> intel_vgpu_flush_post_shadow()
             |
  1:         |-> ppgtt_handle_guest_write_page_table()
                 |
                 |-> ppgtt_handle_guest_entry_add()
                     |
  2:                 | -> ppgtt_populate_spt_by_guest_entry()
                     |    |
                     |    |-> ppgtt_populate_spt()
                     |        |
                     |        |-> ppgtt_populate_shadow_entry()
                     |            |
                     |            |-> ppgtt_populate_spt_by_guest_entry() [see 2]
                     |
                     |-> ppgtt_populate_shadow_entry()

  kvmgt_page_track_write()  <= KVM callback => INTEL_VGPU_STATUS_ATTACHED
  |
  |-> intel_vgpu_page_track_handler()
      |
      |-> ppgtt_write_protection_handler()
          |
          |-> ppgtt_handle_guest_write_page_table_bytes()
              |
              |-> ppgtt_handle_guest_write_page_table() [see 1]
Reviewed-by: Yan Zhao <yan.y.zhao@intel.com>
Tested-by: Yan Zhao <yan.y.zhao@intel.com>
Signed-off-by: Sean Christopherson <seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

drivers/gpu/drm/i915/gvt/gtt.c

@@ -1163,8 +1163,6 @@ static int is_2MB_gtt_possible(struct intel_vgpu *vgpu,
 	if (!HAS_PAGE_SIZES(vgpu->gvt->gt->i915, I915_GTT_PAGE_SIZE_2M))
 		return 0;
 
-	if (!test_bit(INTEL_VGPU_STATUS_ATTACHED, vgpu->status))
-		return -EINVAL;
 	pfn = gfn_to_pfn(vgpu->vfio_device.kvm, ops->get_pfn(entry));
 	if (is_error_noslot_pfn(pfn))
 		return -EINVAL;
@@ -1827,6 +1825,9 @@ static int shadow_ppgtt_mm(struct intel_vgpu_mm *mm)
 	if (mm->ppgtt_mm.shadowed)
 		return 0;
 
+	if (!test_bit(INTEL_VGPU_STATUS_ATTACHED, vgpu->status))
+		return -EINVAL;
+
 	mm->ppgtt_mm.shadowed = true;
 
 	for (index = 0; index < ARRAY_SIZE(mm->ppgtt_mm.guest_pdps); index++) {