linux-4.14.240.patch

From 770b549d3f9c844bea6e107ffac7e776a3362b5b Mon Sep 17 00:00:00 2001
From: Dongli Zhang <dongli.zhang0129@gmail.com>
Date: Mon, 27 Feb 2023 08:23:30 -0800
Subject: [PATCH 1/1] linux-4.14.240

Signed-off-by: Dongli Zhang <dongli.zhang0129@gmail.com>
---
 arch/x86/kvm/mmu.c        | 5 +++++
 arch/x86/kvm/page_track.c | 5 +++++
 2 files changed, 10 insertions(+)

diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c
index e4b48ca2..6b6a73ac 100644
--- a/arch/x86/kvm/mmu.c
+++ b/arch/x86/kvm/mmu.c
@@ -3893,6 +3893,11 @@ static bool page_fault_handle_page_track(struct kvm_vcpu *vcpu,
 	 * guest is writing the page which is write tracked which can
 	 * not be fixed by page fault handler.
 	 */
+	/*
+	 * called by:
+	 *   - arch/x86/kvm/mmu.c|2830| <<mmu_need_write_protect>> if (kvm_page_track_is_active(vcpu, gfn, KVM_PAGE_TRACK_WRITE))
+	 *   - arch/x86/kvm/mmu.c|3896| <<page_fault_handle_page_track>> if (kvm_page_track_is_active(vcpu, gfn, KVM_PAGE_TRACK_WRITE))
+	 */
 	if (kvm_page_track_is_active(vcpu, gfn, KVM_PAGE_TRACK_WRITE))
 		return true;
 
diff --git a/arch/x86/kvm/page_track.c b/arch/x86/kvm/page_track.c
index ea67dc87..104de6bb 100644
--- a/arch/x86/kvm/page_track.c
+++ b/arch/x86/kvm/page_track.c
@@ -143,6 +143,11 @@ EXPORT_SYMBOL_GPL(kvm_slot_page_track_remove_page);
 /*
  * check if the corresponding access on the specified guest page is tracked.
  */
+/*
+ * called by:
+ *   - arch/x86/kvm/mmu.c|2830| <<mmu_need_write_protect>> if (kvm_page_track_is_active(vcpu, gfn, KVM_PAGE_TRACK_WRITE))
+ *   - arch/x86/kvm/mmu.c|3896| <<page_fault_handle_page_track>> if (kvm_page_track_is_active(vcpu, gfn, KVM_PAGE_TRACK_WRITE))
+ */
 bool kvm_page_track_is_active(struct kvm_vcpu *vcpu, gfn_t gfn,
 			      enum kvm_page_track_mode mode)
 {
-- 
2.34.1