KVM: Kill off the old hva-based MMU notifier callbacks

Yank out the hva-based MMU notifier APIs now that all architectures that
use the notifiers have moved to the gfn-based APIs.

No functional change intended.
Signed-off-by: Sean Christopherson <seanjc@google.com>
Message-Id: <20210402005658.3024832-7-seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

arch/arm64/include/asm/kvm_host.h

@@ -586,7 +586,6 @@ int __kvm_arm_vcpu_set_events(struct kvm_vcpu *vcpu,
 			      struct kvm_vcpu_events *events);
 
 #define KVM_ARCH_WANT_MMU_NOTIFIER
-#define KVM_ARCH_WANT_NEW_MMU_NOTIFIER_APIS
 
 void kvm_arm_halt_guest(struct kvm *kvm);
 void kvm_arm_resume_guest(struct kvm *kvm);

arch/mips/include/asm/kvm_host.h

@@ -960,7 +960,6 @@ enum kvm_mips_fault_result kvm_trap_emul_gva_fault(struct kvm_vcpu *vcpu,
 						   bool write);
 
 #define KVM_ARCH_WANT_MMU_NOTIFIER
-#define KVM_ARCH_WANT_NEW_MMU_NOTIFIER_APIS
 
 /* Emulation */
 int kvm_get_inst(u32 *opc, struct kvm_vcpu *vcpu, u32 *out);

arch/powerpc/include/asm/kvm_host.h

@@ -55,7 +55,6 @@
 #include <linux/mmu_notifier.h>
 
 #define KVM_ARCH_WANT_MMU_NOTIFIER
-#define KVM_ARCH_WANT_NEW_MMU_NOTIFIER_APIS
 
 #define HPTEG_CACHE_NUM			(1 << 15)
 #define HPTEG_HASH_BITS_PTE		13

arch/x86/include/asm/kvm_host.h

@@ -1727,7 +1727,6 @@ asmlinkage void kvm_spurious_fault(void);
 	_ASM_EXTABLE(666b, 667b)
 
 #define KVM_ARCH_WANT_MMU_NOTIFIER
-#define KVM_ARCH_WANT_NEW_MMU_NOTIFIER_APIS
 
 int kvm_cpu_has_injectable_intr(struct kvm_vcpu *v);
 int kvm_cpu_has_interrupt(struct kvm_vcpu *vcpu);

include/linux/kvm_host.h

@@ -219,7 +219,6 @@ int kvm_async_pf_wakeup_all(struct kvm_vcpu *vcpu);
 #endif
 
 #ifdef KVM_ARCH_WANT_MMU_NOTIFIER
-#ifdef KVM_ARCH_WANT_NEW_MMU_NOTIFIER_APIS
 struct kvm_gfn_range {
 	struct kvm_memory_slot *slot;
 	gfn_t start;
@@ -231,13 +230,6 @@ bool kvm_unmap_gfn_range(struct kvm *kvm, struct kvm_gfn_range *range);
 bool kvm_age_gfn(struct kvm *kvm, struct kvm_gfn_range *range);
 bool kvm_test_age_gfn(struct kvm *kvm, struct kvm_gfn_range *range);
 bool kvm_set_spte_gfn(struct kvm *kvm, struct kvm_gfn_range *range);
-#else
-int kvm_unmap_hva_range(struct kvm *kvm,
-			unsigned long start, unsigned long end, unsigned flags);
-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);
-#endif /* KVM_ARCH_WANT_NEW_MMU_NOTIFIER_APIS */
 #endif
 
 enum {

virt/kvm/kvm_main.c

@@ -451,8 +451,6 @@ static void kvm_mmu_notifier_invalidate_range(struct mmu_notifier *mn,
 	srcu_read_unlock(&kvm->srcu, idx);
 }
 
-#ifdef KVM_ARCH_WANT_NEW_MMU_NOTIFIER_APIS
-
 typedef bool (*hva_handler_t)(struct kvm *kvm, struct kvm_gfn_range *range);
 
 struct kvm_hva_range {
@@ -564,8 +562,6 @@ static __always_inline int kvm_handle_hva_range_no_flush(struct mmu_notifier *mn
 
 	return ret;
 }
-#endif /* KVM_ARCH_WANT_NEW_MMU_NOTIFIER_APIS */
-
 static void kvm_mmu_notifier_change_pte(struct mmu_notifier *mn,
 					struct mm_struct *mm,
 					unsigned long address,
@@ -573,9 +569,6 @@ static void kvm_mmu_notifier_change_pte(struct mmu_notifier *mn,
 {
 	struct kvm *kvm = mmu_notifier_to_kvm(mn);
 
-#ifndef KVM_ARCH_WANT_NEW_MMU_NOTIFIER_APIS
-	int idx;
-#endif
 	trace_kvm_set_spte_hva(address);
 
 	/*
@@ -585,26 +578,13 @@ static void kvm_mmu_notifier_change_pte(struct mmu_notifier *mn,
 	 */
 	WARN_ON_ONCE(!kvm->mmu_notifier_count);
 
-#ifdef KVM_ARCH_WANT_NEW_MMU_NOTIFIER_APIS
 	kvm_handle_hva_range(mn, address, address + 1, pte, kvm_set_spte_gfn);
-#else
-	idx = srcu_read_lock(&kvm->srcu);
-
-	KVM_MMU_LOCK(kvm);
-
-	if (kvm_set_spte_hva(kvm, address, pte))
-		kvm_flush_remote_tlbs(kvm);
-
-	KVM_MMU_UNLOCK(kvm);
-	srcu_read_unlock(&kvm->srcu, idx);
-#endif
 }
 
 static int kvm_mmu_notifier_invalidate_range_start(struct mmu_notifier *mn,
 					const struct mmu_notifier_range *range)
 {
 	struct kvm *kvm = mmu_notifier_to_kvm(mn);
-#ifdef KVM_ARCH_WANT_NEW_MMU_NOTIFIER_APIS
 	const struct kvm_hva_range hva_range = {
 		.start		= range->start,
 		.end		= range->end,
@@ -613,16 +593,9 @@ static int kvm_mmu_notifier_invalidate_range_start(struct mmu_notifier *mn,
 		.flush_on_ret	= true,
 		.may_block	= mmu_notifier_range_blockable(range),
 	};
-#else
-	int need_tlb_flush = 0, idx;
-#endif
 
 	trace_kvm_unmap_hva_range(range->start, range->end);
 
-#ifndef KVM_ARCH_WANT_NEW_MMU_NOTIFIER_APIS
-	idx = srcu_read_lock(&kvm->srcu);
-#endif
-
 	KVM_MMU_LOCK(kvm);
 	/*
 	 * The count increase must become visible at unlock time as no
@@ -649,20 +622,9 @@ static int kvm_mmu_notifier_invalidate_range_start(struct mmu_notifier *mn,
 			max(kvm->mmu_notifier_range_end, range->end);
 	}
 
-#ifdef KVM_ARCH_WANT_NEW_MMU_NOTIFIER_APIS
 	__kvm_handle_hva_range(kvm, &hva_range);
-#else
-	need_tlb_flush = kvm_unmap_hva_range(kvm, range->start, range->end,
-					     range->flags);
-	/* we've to flush the tlb before the pages can be freed */
-	if (need_tlb_flush || kvm->tlbs_dirty)
-		kvm_flush_remote_tlbs(kvm);
-#endif
 
 	KVM_MMU_UNLOCK(kvm);
-#ifndef KVM_ARCH_WANT_NEW_MMU_NOTIFIER_APIS
-	srcu_read_unlock(&kvm->srcu, idx);
-#endif
 
 	return 0;
 }
@@ -696,27 +658,9 @@ static int kvm_mmu_notifier_clear_flush_young(struct mmu_notifier *mn,
 					      unsigned long start,
 					      unsigned long end)
 {
-#ifndef KVM_ARCH_WANT_NEW_MMU_NOTIFIER_APIS
-	struct kvm *kvm = mmu_notifier_to_kvm(mn);
-	int young, idx;
-#endif
 	trace_kvm_age_hva(start, end);
 
-#ifdef KVM_ARCH_WANT_NEW_MMU_NOTIFIER_APIS
 	return kvm_handle_hva_range(mn, start, end, __pte(0), kvm_age_gfn);
-#else
-	idx = srcu_read_lock(&kvm->srcu);
-	KVM_MMU_LOCK(kvm);
-
-	young = kvm_age_hva(kvm, start, end);
-	if (young)
-		kvm_flush_remote_tlbs(kvm);
-
-	KVM_MMU_UNLOCK(kvm);
-	srcu_read_unlock(&kvm->srcu, idx);
-
-	return young;
-#endif
 }
 
 static int kvm_mmu_notifier_clear_young(struct mmu_notifier *mn,
@@ -724,11 +668,6 @@ static int kvm_mmu_notifier_clear_young(struct mmu_notifier *mn,
 					unsigned long start,
 					unsigned long end)
 {
-#ifndef KVM_ARCH_WANT_NEW_MMU_NOTIFIER_APIS
-	struct kvm *kvm = mmu_notifier_to_kvm(mn);
-	int young, idx;
-#endif
-
 	trace_kvm_age_hva(start, end);
 
 	/*
@@ -744,41 +683,17 @@ static int kvm_mmu_notifier_clear_young(struct mmu_notifier *mn,
 	 * cadence. If we find this inaccurate, we might come up with a
 	 * more sophisticated heuristic later.
 	 */
-#ifdef KVM_ARCH_WANT_NEW_MMU_NOTIFIER_APIS
 	return kvm_handle_hva_range_no_flush(mn, start, end, kvm_age_gfn);
-#else
-	idx = srcu_read_lock(&kvm->srcu);
-	KVM_MMU_LOCK(kvm);
-	young = kvm_age_hva(kvm, start, end);
-	KVM_MMU_UNLOCK(kvm);
-	srcu_read_unlock(&kvm->srcu, idx);
-
-	return young;
-#endif
 }
 
 static int kvm_mmu_notifier_test_young(struct mmu_notifier *mn,
 				       struct mm_struct *mm,
 				       unsigned long address)
 {
-#ifndef KVM_ARCH_WANT_NEW_MMU_NOTIFIER_APIS
-	struct kvm *kvm = mmu_notifier_to_kvm(mn);
-	int young, idx;
-#endif
 	trace_kvm_test_age_hva(address);
 
-#ifdef KVM_ARCH_WANT_NEW_MMU_NOTIFIER_APIS
 	return kvm_handle_hva_range_no_flush(mn, address, address + 1,
 					     kvm_test_age_gfn);
-#else
-	idx = srcu_read_lock(&kvm->srcu);
-	KVM_MMU_LOCK(kvm);
-	young = kvm_test_age_hva(kvm, address);
-	KVM_MMU_UNLOCK(kvm);
-	srcu_read_unlock(&kvm->srcu, idx);
-
-	return young;
-#endif
 }
 
 static void kvm_mmu_notifier_release(struct mmu_notifier *mn,