Subject: [PATCH 1/7] KVM: Pass mmu_notifier_range down to kvm_unmap_hva_range()

From: Marc Zyngier <[email-masked]>
Date: Fri, 13 Dec 2019 18:24:57 +0000

kvm_unmap_hva_range() is currently passed both start and end
fields from the mmu_notifier_range structure. As this struct
now contains important information about the reason of the
unmap (the event field), replace the start/end parameters
with the range struct, and update all architectures.

No functionnal change.

Signed-off-by: Marc Zyngier <[email-masked]>
---
 arch/arm/include/asm/kvm_host.h     | 2 +-
 arch/arm64/include/asm/kvm_host.h   | 2 +-
 arch/mips/include/asm/kvm_host.h    | 2 +-
 arch/mips/kvm/mmu.c                 | 6 ++++--
 arch/powerpc/include/asm/kvm_host.h | 2 +-
 arch/powerpc/kvm/book3s.c           | 5 +++--
 arch/powerpc/kvm/e500_mmu_host.c    | 4 ++--
 arch/x86/include/asm/kvm_host.h     | 3 ++-
 arch/x86/kvm/mmu/mmu.c              | 5 +++--
 arch/x86/kvm/x86.c                  | 4 ++--
 include/linux/kvm_host.h            | 2 +-
 virt/kvm/arm/mmu.c                  | 8 ++++----
 virt/kvm/kvm_main.c                 | 7 +++----
 13 files changed, 28 insertions(+), 24 deletions(-)

diff --git a/arch/arm/include/asm/kvm_host.h b/arch/arm/include/asm/kvm_host.h
index 556cd818eccf..621c71594499 100644
--- a/arch/arm/include/asm/kvm_host.h
+++ b/arch/arm/include/asm/kvm_host.h
@@ -276,7 +276,7 @@ int __kvm_arm_vcpu_set_events(struct kvm_vcpu *vcpu,
 
 #define KVM_ARCH_WANT_MMU_NOTIFIER
 int kvm_unmap_hva_range(struct kvm *kvm,
-			unsigned long start, unsigned long end);
+			const struct mmu_notifier_range *range);
 int kvm_set_spte_hva(struct kvm *kvm, unsigned long hva, pte_t pte);
 
 unsigned long kvm_arm_num_regs(struct kvm_vcpu *vcpu);
diff --git a/arch/arm64/include/asm/kvm_host.h b/arch/arm64/include/asm/kvm_host.h
index c61260cf63c5..dd850f5e81e3 100644
--- a/arch/arm64/include/asm/kvm_host.h
+++ b/arch/arm64/include/asm/kvm_host.h
@@ -441,7 +441,7 @@ int __kvm_arm_vcpu_set_events(struct kvm_vcpu *vcpu,
 
 #define KVM_ARCH_WANT_MMU_NOTIFIER
 int kvm_unmap_hva_range(struct kvm *kvm,
-			unsigned long start, unsigned long end);
+			const struct mmu_notifier_range *range);
 int kvm_set_spte_hva(struct kvm *kvm, unsigned long hva, pte_t pte);
 int kvm_age_hva(struct kvm *kvm, unsigned long start, unsigned long end);
 int kvm_test_age_hva(struct kvm *kvm, unsigned long hva);
diff --git a/arch/mips/include/asm/kvm_host.h b/arch/mips/include/asm/kvm_host.h
index 41204a49cf95..0ed065870f1b 100644
--- a/arch/mips/include/asm/kvm_host.h
+++ b/arch/mips/include/asm/kvm_host.h
@@ -935,7 +935,7 @@ enum kvm_mips_fault_result kvm_trap_emul_gva_fault(struct kvm_vcpu *vcpu,
 
 #define KVM_ARCH_WANT_MMU_NOTIFIER
 int kvm_unmap_hva_range(struct kvm *kvm,
-			unsigned long start, unsigned long end);
+			const struct mmu_notifier_range *range);
 int kvm_set_spte_hva(struct kvm *kvm, unsigned long hva, pte_t pte);
 int kvm_age_hva(struct kvm *kvm, unsigned long start, unsigned long end);
 int kvm_test_age_hva(struct kvm *kvm, unsigned long hva);
diff --git a/arch/mips/kvm/mmu.c b/arch/mips/kvm/mmu.c
index 7dad7a293eae..32ef868258b9 100644
--- a/arch/mips/kvm/mmu.c
+++ b/arch/mips/kvm/mmu.c
@@ -518,9 +518,11 @@ static int kvm_unmap_hva_handler(struct kvm *kvm, gfn_t gfn, gfn_t gfn_end,
 	return 1;
 }
 
-int kvm_unmap_hva_range(struct kvm *kvm, unsigned long start, unsigned long end)
+int kvm_unmap_hva_range(struct kvm *kvm,
+			const struct mmu_notifier_range *range)
 {
-	handle_hva_to_gpa(kvm, start, end, &kvm_unmap_hva_handler, NULL);
+	handle_hva_to_gpa(kvm, range->start, range->end,
+			  &kvm_unmap_hva_handler, NULL);
 
 	kvm_mips_callbacks->flush_shadow_all(kvm);
 	return 0;
diff --git a/arch/powerpc/include/asm/kvm_host.h b/arch/powerpc/include/asm/kvm_host.h
index 0a398f2321c2..8cef585e0abe 100644
--- a/arch/powerpc/include/asm/kvm_host.h
+++ b/arch/powerpc/include/asm/kvm_host.h
@@ -58,7 +58,7 @@
 #define KVM_ARCH_WANT_MMU_NOTIFIER
 
 extern int kvm_unmap_hva_range(struct kvm *kvm,
-			       unsigned long start, unsigned long end);
+			       const struct mmu_notifier_range *range);
 extern int kvm_age_hva(struct kvm *kvm, unsigned long start, unsigned long end);
 extern int kvm_test_age_hva(struct kvm *kvm, unsigned long hva);
 extern int kvm_set_spte_hva(struct kvm *kvm, unsigned long hva, pte_t pte);
diff --git a/arch/powerpc/kvm/book3s.c b/arch/powerpc/kvm/book3s.c
index 58a59ee998e2..a1529a0dd656 100644
--- a/arch/powerpc/kvm/book3s.c
+++ b/arch/powerpc/kvm/book3s.c
@@ -842,9 +842,10 @@ void kvmppc_core_commit_memory_region(struct kvm *kvm,
 	kvm->arch.kvm_ops->commit_memory_region(kvm, mem, old, new, change);
 }
 
-int kvm_unmap_hva_range(struct kvm *kvm, unsigned long start, unsigned long end)
+int kvm_unmap_hva_range(struct kvm *kvm,
+			const struct mmu_notifier_range *range)
 {
-	return kvm->arch.kvm_ops->unmap_hva_range(kvm, start, end);
+	return kvm->arch.kvm_ops->unmap_hva_range(kvm, range->start, range->end);
 }
 
 int kvm_age_hva(struct kvm *kvm, unsigned long start, unsigned long end)
diff --git a/arch/powerpc/kvm/e500_mmu_host.c b/arch/powerpc/kvm/e500_mmu_host.c
index 425d13806645..5a7211901063 100644
--- a/arch/powerpc/kvm/e500_mmu_host.c
+++ b/arch/powerpc/kvm/e500_mmu_host.c
@@ -734,10 +734,10 @@ static int kvm_unmap_hva(struct kvm *kvm, unsigned long hva)
 	return 0;
 }
 
-int kvm_unmap_hva_range(struct kvm *kvm, unsigned long start, unsigned long end)
+int kvm_unmap_hva_range(struct kvm *kvm, const struct mmu_notifier_range *range)
 {
 	/* kvm_unmap_hva flushes everything anyways */
-	kvm_unmap_hva(kvm, start);
+	kvm_unmap_hva(kvm, range->start);
 
 	return 0;
 }
diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index b79cd6aa4075..c479fa845d72 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -1569,7 +1569,8 @@ asmlinkage void kvm_spurious_fault(void);
 	_ASM_EXTABLE(666b, 667b)
 
 #define KVM_ARCH_WANT_MMU_NOTIFIER
-int kvm_unmap_hva_range(struct kvm *kvm, unsigned long start, unsigned long end);
+int kvm_unmap_hva_range(struct kvm *kvm,
+			const struct mmu_notifier_range *range);
 int kvm_age_hva(struct kvm *kvm, unsigned long start, unsigned long end);
 int kvm_test_age_hva(struct kvm *kvm, unsigned long hva);
 int kvm_set_spte_hva(struct kvm *kvm, unsigned long hva, pte_t pte);
diff --git a/arch/x86/kvm/mmu/mmu.c b/arch/x86/kvm/mmu/mmu.c
index 6f92b40d798c..86831be07c17 100644
--- a/arch/x86/kvm/mmu/mmu.c
+++ b/arch/x86/kvm/mmu/mmu.c
@@ -2040,9 +2040,10 @@ static int kvm_handle_hva(struct kvm *kvm, unsigned long hva,
 	return kvm_handle_hva_range(kvm, hva, hva + 1, data, handler);
 }
 
-int kvm_unmap_hva_range(struct kvm *kvm, unsigned long start, unsigned long end)
+int kvm_unmap_hva_range(struct kvm *kvm,
+			const struct mmu_notifier_range *range);
 {
-	return kvm_handle_hva_range(kvm, start, end, 0, kvm_unmap_rmapp);
+	return kvm_handle_hva_range(kvm, range->start, range->end, 0, kvm_unmap_rmapp);
 }
 
 int kvm_set_spte_hva(struct kvm *kvm, unsigned long hva, pte_t pte)
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index cf917139de6b..c1a238f4ee35 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -7942,7 +7942,7 @@ static void vcpu_load_eoi_exitmap(struct kvm_vcpu *vcpu)
 }
 
 int kvm_arch_mmu_notifier_invalidate_range(struct kvm *kvm,
-		unsigned long start, unsigned long end,
+		const struct mmu_notifier_range *range,
 		bool blockable)
 {
 	unsigned long apic_address;
@@ -7952,7 +7952,7 @@ int kvm_arch_mmu_notifier_invalidate_range(struct kvm *kvm,
 	 * Update it when it becomes invalid.
 	 */
 	apic_address = gfn_to_hva(kvm, APIC_DEFAULT_PHYS_BASE >> PAGE_SHIFT);
-	if (start <= apic_address && apic_address < end)
+	if (range->start <= apic_address && apic_address < range->end)
 		kvm_make_all_cpus_request(kvm, KVM_REQ_APIC_PAGE_RELOAD);
 
 	return 0;
diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
index 7ed1e2f8641e..d6e2ae2accc4 100644
--- a/include/linux/kvm_host.h
+++ b/include/linux/kvm_host.h
@@ -1391,7 +1391,7 @@ static inline long kvm_arch_vcpu_async_ioctl(struct file *filp,
 #endif /* CONFIG_HAVE_KVM_VCPU_ASYNC_IOCTL */
 
 int kvm_arch_mmu_notifier_invalidate_range(struct kvm *kvm,
-		unsigned long start, unsigned long end, bool blockable);
+		const struct mmu_notifier_range *range, bool blockable);
 
 #ifdef CONFIG_HAVE_KVM_VCPU_RUN_PID_CHANGE
 int kvm_arch_vcpu_run_pid_change(struct kvm_vcpu *vcpu);
diff --git a/virt/kvm/arm/mmu.c b/virt/kvm/arm/mmu.c
index 38b4c910b6c3..078e10c5650e 100644
--- a/virt/kvm/arm/mmu.c
+++ b/virt/kvm/arm/mmu.c
@@ -2035,14 +2035,14 @@ static int kvm_unmap_hva_handler(struct kvm *kvm, gpa_t gpa, u64 size, void *dat
 	return 0;
 }
 
-int kvm_unmap_hva_range(struct kvm *kvm,
-			unsigned long start, unsigned long end)
+int kvm_unmap_hva_range(struct kvm *kvm, const struct mmu_notifier_range *range)
 {
 	if (!kvm->arch.pgd)
 		return 0;
 
-	trace_kvm_unmap_hva_range(start, end);
-	handle_hva_to_gpa(kvm, start, end, &kvm_unmap_hva_handler, NULL);
+	trace_kvm_unmap_hva_range(range->start, range->end);
+	handle_hva_to_gpa(kvm, range->start, range->end,
+			  &kvm_unmap_hva_handler, NULL);
 	return 0;
 }
 
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index 00268290dcbd..7c3665ad1035 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -158,7 +158,7 @@ static unsigned long long kvm_createvm_count;
 static unsigned long long kvm_active_vms;
 
 __weak int kvm_arch_mmu_notifier_invalidate_range(struct kvm *kvm,
-		unsigned long start, unsigned long end, bool blockable)
+		const struct mmu_notifier_range *range, bool blockable)
 {
 	return 0;
 }
@@ -415,7 +415,7 @@ static int kvm_mmu_notifier_invalidate_range_start(struct mmu_notifier *mn,
 	 * count is also read inside the mmu_lock critical section.
 	 */
 	kvm->mmu_notifier_count++;
-	need_tlb_flush = kvm_unmap_hva_range(kvm, range->start, range->end);
+	need_tlb_flush = kvm_unmap_hva_range(kvm, range);
 	need_tlb_flush |= kvm->tlbs_dirty;
 	/* we've to flush the tlb before the pages can be freed */
 	if (need_tlb_flush)
@@ -423,8 +423,7 @@ static int kvm_mmu_notifier_invalidate_range_start(struct mmu_notifier *mn,
 
 	spin_unlock(&kvm->mmu_lock);
 
-	ret = kvm_arch_mmu_notifier_invalidate_range(kvm, range->start,
-					range->end,
+	ret = kvm_arch_mmu_notifier_invalidate_range(kvm, range,
 					mmu_notifier_range_blockable(range));
 
 	srcu_read_unlock(&kvm->srcu, idx);
-- 
2.20.1

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