linux-kernel - [PATCH] KVM: x86/mmu: Remove unused "const u8 *new" for kvm_mmu_track

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Date:   Tue,  8 Aug 2023 19:40:06 +0800
From:   Like Xu <like.xu.linux@...il.com>
To:     Sean Christopherson <seanjc@...gle.com>
Cc:     Paolo Bonzini <pbonzini@...hat.com>, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] KVM: x86/mmu: Remove unused "const u8 *new" for kvm_mmu_track_write()

From: Like Xu <likexu@...cent.com>

The incoming parameter @new has not been required since commit 0e0fee5c539b
("kvm: mmu: Fix race in emulated page table writes"). And the callback
kvmgt_page_track_write() registered by KVMGT still formally consumes it.

No functional change intended.

Suggested-by: Sean Christopherson <seanjc@...gle.com>
Signed-off-by: Like Xu <likexu@...cent.com>
---
 arch/x86/kvm/mmu.h            | 3 +--
 arch/x86/kvm/mmu/mmu.c        | 3 +--
 arch/x86/kvm/mmu/page_track.h | 2 +-
 3 files changed, 3 insertions(+), 5 deletions(-)

diff --git a/arch/x86/kvm/mmu.h b/arch/x86/kvm/mmu.h
index 253fb2093d5d..27531ce6b739 100644
--- a/arch/x86/kvm/mmu.h
+++ b/arch/x86/kvm/mmu.h
@@ -121,8 +121,7 @@ void kvm_mmu_unload(struct kvm_vcpu *vcpu);
 void kvm_mmu_free_obsolete_roots(struct kvm_vcpu *vcpu);
 void kvm_mmu_sync_roots(struct kvm_vcpu *vcpu);
 void kvm_mmu_sync_prev_roots(struct kvm_vcpu *vcpu);
-void kvm_mmu_track_write(struct kvm_vcpu *vcpu, gpa_t gpa, const u8 *new,
-			 int bytes);
+void kvm_mmu_track_write(struct kvm_vcpu *vcpu, gpa_t gpa, int bytes);
 
 static inline int kvm_mmu_reload(struct kvm_vcpu *vcpu)
 {
diff --git a/arch/x86/kvm/mmu/mmu.c b/arch/x86/kvm/mmu/mmu.c
index 9e4cd8b4a202..d742fae074c1 100644
--- a/arch/x86/kvm/mmu/mmu.c
+++ b/arch/x86/kvm/mmu/mmu.c
@@ -5638,8 +5638,7 @@ static u64 *get_written_sptes(struct kvm_mmu_page *sp, gpa_t gpa, int *nspte)
 	return spte;
 }
 
-void kvm_mmu_track_write(struct kvm_vcpu *vcpu, gpa_t gpa, const u8 *new,
-			 int bytes)
+void kvm_mmu_track_write(struct kvm_vcpu *vcpu, gpa_t gpa, int bytes)
 {
 	gfn_t gfn = gpa >> PAGE_SHIFT;
 	struct kvm_mmu_page *sp;
diff --git a/arch/x86/kvm/mmu/page_track.h b/arch/x86/kvm/mmu/page_track.h
index 62f98c6c5af3..ea5dfd53b5c4 100644
--- a/arch/x86/kvm/mmu/page_track.h
+++ b/arch/x86/kvm/mmu/page_track.h
@@ -52,7 +52,7 @@ static inline void kvm_page_track_write(struct kvm_vcpu *vcpu, gpa_t gpa,
 {
 	__kvm_page_track_write(vcpu->kvm, gpa, new, bytes);
 
-	kvm_mmu_track_write(vcpu, gpa, new, bytes);
+	kvm_mmu_track_write(vcpu, gpa, bytes);
 }
 
 #endif /* __KVM_X86_PAGE_TRACK_H */

base-commit: 240f736891887939571854bd6d734b6c9291f22e
-- 
2.41.0