FAILED: patch "[PATCH] RISC-V: KVM: Release unused page after MMU invalidation" failed to apply to 6.18-stable tree

The patch below does not apply to the 6.18-stable tree.
If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to <[email protected]>.

To reproduce the conflict and resubmit, you may use the following commands:

git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-6.18.y
git checkout FETCH_HEAD
git cherry-pick -x ed54fdb460a6e81d5f8f38388d1f10b385dd4a58
# <resolve conflicts, build, test, etc.>
git commit -s
git send-email --to '<[email protected]>' --in-reply-to '2026092938-clause-lego-70c6@gregkh' --subject-prefix 'PATCH 6.18.y' 'HEAD^..'

Possible dependencies:

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From ed54fdb460a6e81d5f8f38388d1f10b385dd4a58 Mon Sep 17 00:00:00 2001
From: Xie Bo <[email protected]>
Date: Mon, 10 Aug 2026 13:15:43 +0800
Subject: [PATCH] RISC-V: KVM: Release unused page after MMU invalidation

If an MMU invalidation races with a G-stage fault, the fault handler skips installing the page but leaves ret set to zero. As a result, kvm_release_faultin_page() treats the page as used and can unnecessarily mark it dirty.

Track the invalidation retry separately and release the page as unused, while preserving the existing return value so that the vCPU retries the fault.

index 6035b5ec9503..d189fd58d7bf 100644
@@ -627,6 +627,7 @@ int kvm_riscv_mmu_map(struct kvm_vcpu *vcpu, struct kvm_memory_slot *memslot,
 	int ret;
 	kvm_pfn_t hfn;
 	bool is_hugetlb;
+	bool unused = false;
 	bool writable;
 	unsigned int vma_pageshift;
 	gfn_t gfn = gpa >> PAGE_SHIFT;

@@ -719,8 +720,10 @@ int kvm_riscv_mmu_map(struct kvm_vcpu *vcpu, struct kvm_memory_slot *memslot,
 
 	write_lock(&kvm->mmu_lock);
 
-	if (mmu_invalidate_retry(kvm, mmu_seq))
+	if (mmu_invalidate_retry(kvm, mmu_seq)) {
+		unused = true;
 		goto out_unlock;
+	}
 
 	/*
 	 * Check if we are backed by a THP and thus use block mapping if

@@ -743,7 +746,8 @@ int kvm_riscv_mmu_map(struct kvm_vcpu *vcpu, struct kvm_memory_slot *memslot,
 		kvm_err("Failed to map in G-stage\n");
 
 out_unlock:
-	kvm_release_faultin_page(kvm, page, ret && ret != -EEXIST, writable);
+	kvm_release_faultin_page(kvm, page,
+				 unused || (ret && ret != -EEXIST), writable);
 	write_unlock(&kvm->mmu_lock);
 	return ret;
 }