FAILED: patch "[PATCH] KVM: x86/mmu: Use yield-safe TDP MMU root iter in MMU" failed to apply to 5.15-stable tree

[<gregkh@linuxfoundation.org>]

The patch below does not apply to the 5.15-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 <stable@vger.kernel.org>.

thanks,

greg k-h

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

From 7533377215b6ee432c06c5855f6be5d66e694e46 Mon Sep 17 00:00:00 2001
From: Sean Christopherson <seanjc@google.com>
Date: Sat, 20 Nov 2021 01:50:08 +0000
Subject: [PATCH] KVM: x86/mmu: Use yield-safe TDP MMU root iter in MMU
 notifier unmapping

Use the yield-safe variant of the TDP MMU iterator when handling an
unmapping event from the MMU notifier, as most occurences of the event
allow yielding.

Fixes: e1eed5847b09 ("KVM: x86/mmu: Allow yielding during MMU notifier unmap/zap, if possible")
Cc: stable@vger.kernel.org
Signed-off-by: Sean Christopherson <seanjc@google.com>
Message-Id: <20211120015008.3780032-1-seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

diff --git a/arch/x86/kvm/mmu/tdp_mmu.c b/arch/x86/kvm/mmu/tdp_mmu.c
index 1f8c9f783b78..4cd6bf7e73f0 100644
--- a/arch/x86/kvm/mmu/tdp_mmu.c
+++ b/arch/x86/kvm/mmu/tdp_mmu.c
@@ -1031,7 +1031,7 @@ bool kvm_tdp_mmu_unmap_gfn_range(struct kvm *kvm, struct kvm_gfn_range *range,
 {
 	struct kvm_mmu_page *root;
 
-	for_each_tdp_mmu_root(kvm, root, range->slot->as_id)
+	for_each_tdp_mmu_root_yield_safe(kvm, root, range->slot->as_id, false)
 		flush = zap_gfn_range(kvm, root, range->start, range->end,
 				      range->may_block, flush, false);