[PATCH 3/13] KVM: Replace old tlb flush function with new one to flush a specified range.

[Tianyu Lan <Tianyu.Lan@microsoft.com>]

This patch is to replace kvm_flush_remote_tlbs() with kvm_flush_
remote_tlbs_with_address() in some functions without logic change.

Signed-off-by: Lan Tianyu <Tianyu.Lan@microsoft.com>
---
 arch/x86/kvm/mmu.c         | 34 +++++++++++++++++++++++-----------
 arch/x86/kvm/paging_tmpl.h |  9 +++++++--
 2 files changed, 30 insertions(+), 13 deletions(-)

diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c
index 8cf47befc0f2..0ee310bad2c6 100644
--- a/arch/x86/kvm/mmu.c
+++ b/arch/x86/kvm/mmu.c
@@ -1482,8 +1482,12 @@ static bool __drop_large_spte(struct kvm *kvm, u64 *sptep)
 
 static void drop_large_spte(struct kvm_vcpu *vcpu, u64 *sptep)
 {
-	if (__drop_large_spte(vcpu->kvm, sptep))
-		kvm_flush_remote_tlbs(vcpu->kvm);
+	if (__drop_large_spte(vcpu->kvm, sptep)) {
+		struct kvm_mmu_page *sp = page_header(__pa(sptep));
+
+		kvm_flush_remote_tlbs_with_address(vcpu->kvm, sp->gfn,
+			sp->gfn + KVM_PAGES_PER_HPAGE(sp->role.level) - 1);
+	}
 }
 
 /*
@@ -1770,7 +1774,7 @@ static int kvm_set_pte_rmapp(struct kvm *kvm, struct kvm_rmap_head *rmap_head,
 	}
 
 	if (need_flush)
-		kvm_flush_remote_tlbs(kvm);
+		kvm_flush_remote_tlbs_with_address(kvm, gfn, gfn);
 
 	return 0;
 }
@@ -1956,7 +1960,8 @@ static void rmap_recycle(struct kvm_vcpu *vcpu, u64 *spte, gfn_t gfn)
 	rmap_head = gfn_to_rmap(vcpu->kvm, gfn, sp);
 
 	kvm_unmap_rmapp(vcpu->kvm, rmap_head, NULL, gfn, sp->role.level, 0);
-	kvm_flush_remote_tlbs(vcpu->kvm);
+	kvm_flush_remote_tlbs_with_address(vcpu->kvm, sp->gfn,
+			sp->gfn + KVM_PAGES_PER_HPAGE(sp->role.level) - 1);
 }
 
 int kvm_age_hva(struct kvm *kvm, unsigned long start, unsigned long end)
@@ -2472,7 +2477,7 @@ static struct kvm_mmu_page *kvm_mmu_get_page(struct kvm_vcpu *vcpu,
 		account_shadowed(vcpu->kvm, sp);
 		if (level == PT_PAGE_TABLE_LEVEL &&
 		      rmap_write_protect(vcpu, gfn))
-			kvm_flush_remote_tlbs(vcpu->kvm);
+			kvm_flush_remote_tlbs_with_address(vcpu->kvm, gfn, gfn);
 
 		if (level > PT_PAGE_TABLE_LEVEL && need_sync)
 			flush |= kvm_sync_pages(vcpu, gfn, &invalid_list);
@@ -2592,7 +2597,8 @@ static void validate_direct_spte(struct kvm_vcpu *vcpu, u64 *sptep,
 			return;
 
 		drop_parent_pte(child, sptep);
-		kvm_flush_remote_tlbs(vcpu->kvm);
+		kvm_flush_remote_tlbs_with_address(vcpu->kvm, child->gfn,
+				child->gfn);
 	}
 }
 
@@ -3016,8 +3022,10 @@ static int mmu_set_spte(struct kvm_vcpu *vcpu, u64 *sptep, unsigned pte_access,
 			ret = RET_PF_EMULATE;
 		kvm_make_request(KVM_REQ_TLB_FLUSH, vcpu);
 	}
+
 	if (set_spte_ret & SET_SPTE_NEED_REMOTE_TLB_FLUSH || flush)
-		kvm_flush_remote_tlbs(vcpu->kvm);
+		kvm_flush_remote_tlbs_with_address(vcpu->kvm, gfn,
+				gfn + KVM_PAGES_PER_HPAGE(level) - 1);
 
 	if (unlikely(is_mmio_spte(*sptep)))
 		ret = RET_PF_EMULATE;
@@ -5626,7 +5634,8 @@ void kvm_mmu_slot_remove_write_access(struct kvm *kvm,
 	 * on PT_WRITABLE_MASK anymore.
 	 */
 	if (flush)
-		kvm_flush_remote_tlbs(kvm);
+		kvm_flush_remote_tlbs_with_address(kvm, memslot->base_gfn,
+			memslot->base_gfn + memslot->npages - 1);
 }
 
 static bool kvm_mmu_zap_collapsible_spte(struct kvm *kvm,
@@ -5690,7 +5699,8 @@ void kvm_mmu_slot_leaf_clear_dirty(struct kvm *kvm,
 	 * dirty_bitmap.
 	 */
 	if (flush)
-		kvm_flush_remote_tlbs(kvm);
+		kvm_flush_remote_tlbs_with_address(kvm, memslot->base_gfn,
+			memslot->base_gfn + memslot->npages - 1);
 }
 EXPORT_SYMBOL_GPL(kvm_mmu_slot_leaf_clear_dirty);
 
@@ -5708,7 +5718,8 @@ void kvm_mmu_slot_largepage_remove_write_access(struct kvm *kvm,
 	lockdep_assert_held(&kvm->slots_lock);
 
 	if (flush)
-		kvm_flush_remote_tlbs(kvm);
+		kvm_flush_remote_tlbs_with_address(kvm, memslot->base_gfn,
+			memslot->base_gfn + memslot->npages - 1);
 }
 EXPORT_SYMBOL_GPL(kvm_mmu_slot_largepage_remove_write_access);
 
@@ -5725,7 +5736,8 @@ void kvm_mmu_slot_set_dirty(struct kvm *kvm,
 
 	/* see kvm_mmu_slot_leaf_clear_dirty */
 	if (flush)
-		kvm_flush_remote_tlbs(kvm);
+		kvm_flush_remote_tlbs_with_address(kvm, memslot->base_gfn,
+			memslot->base_gfn + memslot->npages - 1);
 }
 EXPORT_SYMBOL_GPL(kvm_mmu_slot_set_dirty);
 
diff --git a/arch/x86/kvm/paging_tmpl.h b/arch/x86/kvm/paging_tmpl.h
index 14ffd973df54..f45f1a5fbfe8 100644
--- a/arch/x86/kvm/paging_tmpl.h
+++ b/arch/x86/kvm/paging_tmpl.h
@@ -892,8 +892,13 @@ static void FNAME(invlpg)(struct kvm_vcpu *vcpu, gva_t gva, hpa_t root_hpa)
 			pte_gpa = FNAME(get_level1_sp_gpa)(sp);
 			pte_gpa += (sptep - sp->spt) * sizeof(pt_element_t);
 
-			if (mmu_page_zap_pte(vcpu->kvm, sp, sptep))
-				kvm_flush_remote_tlbs(vcpu->kvm);
+			if (mmu_page_zap_pte(vcpu->kvm, sp, sptep)) {
+				u64 gfn_end = sp->gfn +
+					KVM_PAGES_PER_HPAGE(sp->role.level) - 1;
+
+				kvm_flush_remote_tlbs_with_address(vcpu->kvm,
+					sp->gfn, gfn_end);
+			}
 
 			if (!rmap_can_add(vcpu))
 				break;
-- 
2.14.4