Patch "drm/i915/gvt: Put the page reference obtained by KVM's gfn_to_pfn()" has been added to the 6.5-stable tree

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This is a note to let you know that I've just added the patch titled

    drm/i915/gvt: Put the page reference obtained by KVM's gfn_to_pfn()

to the 6.5-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     drm-i915-gvt-put-the-page-reference-obtained-by-kvm-.patch
and it can be found in the queue-6.5 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit a41be3a843e7311daf8c153a908d49b9c2b80c26
Author: Sean Christopherson <seanjc@xxxxxxxxxx>
Date:   Fri Jul 28 18:35:11 2023 -0700

    drm/i915/gvt: Put the page reference obtained by KVM's gfn_to_pfn()
    
    [ Upstream commit 708e49583d7da863898b25dafe4bcd799c414278 ]
    
    Put the struct page reference acquired by gfn_to_pfn(), KVM's API is that
    the caller is ultimately responsible for dropping any reference.
    
    Note, kvm_release_pfn_clean() ensures the pfn is actually a refcounted
    struct page before trying to put any references.
    
    Fixes: b901b252b6cf ("drm/i915/gvt: Add 2M huge gtt support")
    Reviewed-by: Yan Zhao <yan.y.zhao@xxxxxxxxx>
    Tested-by: Yongwei Ma <yongwei.ma@xxxxxxxxx>
    Reviewed-by: Zhi Wang <zhi.a.wang@xxxxxxxxx>
    Link: https://lore.kernel.org/r/20230729013535.1070024-6-seanjc@xxxxxxxxxx
    Signed-off-by: Sean Christopherson <seanjc@xxxxxxxxxx>
    Signed-off-by: Paolo Bonzini <pbonzini@xxxxxxxxxx>
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/drivers/gpu/drm/i915/gvt/gtt.c b/drivers/gpu/drm/i915/gvt/gtt.c
index 58b9b316ae462..8ba6c8668f033 100644
--- a/drivers/gpu/drm/i915/gvt/gtt.c
+++ b/drivers/gpu/drm/i915/gvt/gtt.c
@@ -1174,6 +1174,7 @@ static int is_2MB_gtt_possible(struct intel_vgpu *vgpu,
 {
 	const struct intel_gvt_gtt_pte_ops *ops = vgpu->gvt->gtt.pte_ops;
 	kvm_pfn_t pfn;
+	int ret;
 
 	if (!HAS_PAGE_SIZES(vgpu->gvt->gt->i915, I915_GTT_PAGE_SIZE_2M))
 		return 0;
@@ -1187,7 +1188,9 @@ static int is_2MB_gtt_possible(struct intel_vgpu *vgpu,
 	if (!pfn_valid(pfn))
 		return -EINVAL;
 
-	return PageTransHuge(pfn_to_page(pfn));
+	ret = PageTransHuge(pfn_to_page(pfn));
+	kvm_release_pfn_clean(pfn);
+	return ret;
 }
 
 static int split_2MB_gtt_entry(struct intel_vgpu *vgpu,



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