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authorAndrea Arcangeli <aarcange@redhat.com>2011-01-13 15:46:48 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2011-01-13 17:32:41 -0800
commit936a5fe6e6148c0b3ea0d792b903847d9b9931a1 (patch)
treef0326a5877a89251ff2cb727d5e832e911ed1d18 /arch/x86
parent47ad8475c000141eacb3ecda5e5ce4b43a9cd04d (diff)
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>
Diffstat (limited to 'arch/x86')
-rw-r--r--arch/x86/kvm/mmu.c91
-rw-r--r--arch/x86/kvm/paging_tmpl.h9
2 files changed, 83 insertions, 17 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);
diff --git a/arch/x86/kvm/paging_tmpl.h b/arch/x86/kvm/paging_tmpl.h
index 53210f1e94c2..6bccc24c4181 100644
--- a/arch/x86/kvm/paging_tmpl.h
+++ b/arch/x86/kvm/paging_tmpl.h
@@ -550,6 +550,7 @@ static int FNAME(page_fault)(struct kvm_vcpu *vcpu, gva_t addr, u32 error_code,
int r;
pfn_t pfn;
int level = PT_PAGE_TABLE_LEVEL;
+ int force_pt_level;
unsigned long mmu_seq;
bool map_writable;
@@ -577,7 +578,11 @@ static int FNAME(page_fault)(struct kvm_vcpu *vcpu, gva_t addr, u32 error_code,
return 0;
}
- if (walker.level >= PT_DIRECTORY_LEVEL) {
+ if (walker.level >= PT_DIRECTORY_LEVEL)
+ force_pt_level = mapping_level_dirty_bitmap(vcpu, walker.gfn);
+ else
+ force_pt_level = 1;
+ if (!force_pt_level) {
level = min(walker.level, mapping_level(vcpu, walker.gfn));
walker.gfn = walker.gfn & ~(KVM_PAGES_PER_HPAGE(level) - 1);
}
@@ -599,6 +604,8 @@ static int FNAME(page_fault)(struct kvm_vcpu *vcpu, gva_t addr, u32 error_code,
trace_kvm_mmu_audit(vcpu, AUDIT_PRE_PAGE_FAULT);
kvm_mmu_free_some_pages(vcpu);
+ if (!force_pt_level)
+ transparent_hugepage_adjust(vcpu, &walker.gfn, &pfn, &level);
sptep = FNAME(fetch)(vcpu, addr, &walker, user_fault, write_fault,
level, &write_pt, pfn, map_writable, prefault);
(void)sptep;