thp: kvm mmu transparent hugepage support

This should work for both hugetlbfs and transparent hugepages.

[akpm@linux-foundation.org: bring forward PageTransCompound() addition for bisectability]
Signed-off-by: Andrea Arcangeli <aarcange@redhat.com>
Cc: Avi Kivity <avi@redhat.com>
Cc: Marcelo Tosatti <mtosatti@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 75 insertions, 16 deletions

diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c
index 9cafbb499813..47b2c3288b6b 100644
--- a/arch/x86/kvm/mmu.c
+++ b/arch/x86/kvm/mmu.c
@@ -554,14 +554,18 @@ static int host_mapping_level(struct kvm *kvm, gfn_t gfn)
 	return ret;
 }
 
-static int mapping_level(struct kvm_vcpu *vcpu, gfn_t large_gfn)
+static bool mapping_level_dirty_bitmap(struct kvm_vcpu *vcpu, gfn_t large_gfn)
 {
 	struct kvm_memory_slot *slot;
-	int host_level, level, max_level;
-
 	slot = gfn_to_memslot(vcpu->kvm, large_gfn);
 	if (slot && slot->dirty_bitmap)
-		return PT_PAGE_TABLE_LEVEL;
+		return true;
+	return false;
+}
+
+static int mapping_level(struct kvm_vcpu *vcpu, gfn_t large_gfn)
+{
+	int host_level, level, max_level;
 
 	host_level = host_mapping_level(vcpu->kvm, large_gfn);
 
@@ -2281,6 +2285,48 @@ static int kvm_handle_bad_page(struct kvm *kvm, gfn_t gfn, pfn_t pfn)
 	return 1;
 }
 
+static void transparent_hugepage_adjust(struct kvm_vcpu *vcpu,
+					gfn_t *gfnp, pfn_t *pfnp, int *levelp)
+{
+	pfn_t pfn = *pfnp;
+	gfn_t gfn = *gfnp;
+	int level = *levelp;
+
+	/*
+	 * Check if it's a transparent hugepage. If this would be an
+	 * hugetlbfs page, level wouldn't be set to
+	 * PT_PAGE_TABLE_LEVEL and there would be no adjustment done
+	 * here.
+	 */
+	if (!is_error_pfn(pfn) && !kvm_is_mmio_pfn(pfn) &&
+	    level == PT_PAGE_TABLE_LEVEL &&
+	    PageTransCompound(pfn_to_page(pfn)) &&
+	    !has_wrprotected_page(vcpu->kvm, gfn, PT_DIRECTORY_LEVEL)) {
+		unsigned long mask;
+		/*
+		 * mmu_notifier_retry was successful and we hold the
+		 * mmu_lock here, so the pmd can't become splitting
+		 * from under us, and in turn
+		 * __split_huge_page_refcount() can't run from under
+		 * us and we can safely transfer the refcount from
+		 * PG_tail to PG_head as we switch the pfn to tail to
+		 * head.
+		 */
+		*levelp = level = PT_DIRECTORY_LEVEL;
+		mask = KVM_PAGES_PER_HPAGE(level) - 1;
+		VM_BUG_ON((gfn & mask) != (pfn & mask));
+		if (pfn & mask) {
+			gfn &= ~mask;
+			*gfnp = gfn;
+			kvm_release_pfn_clean(pfn);
+			pfn &= ~mask;
+			if (!get_page_unless_zero(pfn_to_page(pfn)))
+				BUG();
+			*pfnp = pfn;
+		}
+	}
+}
+
 static bool try_async_pf(struct kvm_vcpu *vcpu, bool prefault, gfn_t gfn,
 			 gva_t gva, pfn_t *pfn, bool write, bool *writable);
 
@@ -2289,20 +2335,25 @@ static int nonpaging_map(struct kvm_vcpu *vcpu, gva_t v, int write, gfn_t gfn,
 {
 	int r;
 	int level;
+	int force_pt_level;
 	pfn_t pfn;
 	unsigned long mmu_seq;
 	bool map_writable;
 
-	level = mapping_level(vcpu, gfn);
-
-	/*
-	 * This path builds a PAE pagetable - so we can map 2mb pages at
-	 * maximum. Therefore check if the level is larger than that.
-	 */
-	if (level > PT_DIRECTORY_LEVEL)
-		level = PT_DIRECTORY_LEVEL;
+	force_pt_level = mapping_level_dirty_bitmap(vcpu, gfn);
+	if (likely(!force_pt_level)) {
+		level = mapping_level(vcpu, gfn);
+		/*
+		 * This path builds a PAE pagetable - so we can map
+		 * 2mb pages at maximum. Therefore check if the level
+		 * is larger than that.
+		 */
+		if (level > PT_DIRECTORY_LEVEL)
+			level = PT_DIRECTORY_LEVEL;
 
-	gfn &= ~(KVM_PAGES_PER_HPAGE(level) - 1);
+		gfn &= ~(KVM_PAGES_PER_HPAGE(level) - 1);
+	} else
+		level = PT_PAGE_TABLE_LEVEL;
 
 	mmu_seq = vcpu->kvm->mmu_notifier_seq;
 	smp_rmb();
@@ -2318,6 +2369,8 @@ static int nonpaging_map(struct kvm_vcpu *vcpu, gva_t v, int write, gfn_t gfn,
 	if (mmu_notifier_retry(vcpu, mmu_seq))
 		goto out_unlock;
 	kvm_mmu_free_some_pages(vcpu);
+	if (likely(!force_pt_level))
+		transparent_hugepage_adjust(vcpu, &gfn, &pfn, &level);
 	r = __direct_map(vcpu, v, write, map_writable, level, gfn, pfn,
 			 prefault);
 	spin_unlock(&vcpu->kvm->mmu_lock);
@@ -2655,6 +2708,7 @@ static int tdp_page_fault(struct kvm_vcpu *vcpu, gva_t gpa, u32 error_code,
 	pfn_t pfn;
 	int r;
 	int level;
+	int force_pt_level;
 	gfn_t gfn = gpa >> PAGE_SHIFT;
 	unsigned long mmu_seq;
 	int write = error_code & PFERR_WRITE_MASK;
@@ -2667,9 +2721,12 @@ static int tdp_page_fault(struct kvm_vcpu *vcpu, gva_t gpa, u32 error_code,
 	if (r)
 		return r;
 
-	level = mapping_level(vcpu, gfn);
-
-	gfn &= ~(KVM_PAGES_PER_HPAGE(level) - 1);
+	force_pt_level = mapping_level_dirty_bitmap(vcpu, gfn);
+	if (likely(!force_pt_level)) {
+		level = mapping_level(vcpu, gfn);
+		gfn &= ~(KVM_PAGES_PER_HPAGE(level) - 1);
+	} else
+		level = PT_PAGE_TABLE_LEVEL;
 
 	mmu_seq = vcpu->kvm->mmu_notifier_seq;
 	smp_rmb();
@@ -2684,6 +2741,8 @@ static int tdp_page_fault(struct kvm_vcpu *vcpu, gva_t gpa, u32 error_code,
 	if (mmu_notifier_retry(vcpu, mmu_seq))
 		goto out_unlock;
 	kvm_mmu_free_some_pages(vcpu);
+	if (likely(!force_pt_level))
+		transparent_hugepage_adjust(vcpu, &gfn, &pfn, &level);
 	r = __direct_map(vcpu, gpa, write, map_writable,
 			 level, gfn, pfn, prefault);
 	spin_unlock(&vcpu->kvm->mmu_lock);