Commit a15e61f3 authored by Yan Zhao's avatar Yan Zhao Committed by Paolo Bonzini
Browse files

drm/i915/gvt: Don't try to unpin an empty page range 



Attempt to unpin pages in the error path of gvt_pin_guest_page() if and
only if at least one page was successfully pinned.  Unpinning doesn't
cause functional problems, but vfio_device_container_unpin_pages()
rightfully warns about being asked to unpin zero pages.

Signed-off-by: default avatarYan Zhao <yan.y.zhao@intel.com>
[sean: write changelog]
Reviewed-by: default avatarZhi Wang <zhi.a.wang@intel.com>
Link: https://lore.kernel.org/r/20230729013535.1070024-5-seanjc@google.com


Signed-off-by: default avatarSean Christopherson <seanjc@google.com>
Signed-off-by: default avatarPaolo Bonzini <pbonzini@redhat.com>
parent adc7b226

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

+2 −1
Original line number Diff line number Diff line
@@ -172,6 +172,7 @@ static int gvt_pin_guest_page(struct intel_vgpu *vgpu, unsigned long gfn, 
	*page = base_page;

	return 0;

err:

	if (npage)

		gvt_unpin_guest_page(vgpu, gfn, npage * PAGE_SIZE);

	return ret;

}