Merge branch 'kvm-updates/2.6.34' of git://git.kernel.org/pub/scm/virt/kvm/kvm

* 'kvm-updates/2.6.34' of git://git.kernel.org/pub/scm/virt/kvm/kvm:
  KVM: x86: Fix TSS size check for 16-bit tasks
  KVM: Add missing srcu_read_lock() for kvm_mmu_notifier_release()
  KVM: Increase NR_IOBUS_DEVS limit to 200
  KVM: fix the handling of dirty bitmaps to avoid overflows
  KVM: MMU: fix kvm_mmu_zap_page() and its calling path
  KVM: VMX: Save/restore rflags.vm correctly in real mode
  KVM: allow bit 10 to be cleared in MSR_IA32_MC4_CTL
  KVM: Don't spam kernel log when injecting exceptions due to bad cr writes
  KVM: SVM: Fix memory leaks that happen when svm_create_vcpu() fails
  KVM: take srcu lock before call to complete_pio()

1 files changed, 12 insertions, 5 deletions

diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index 5a0cd194dce0..c82ae2492634 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -341,7 +341,11 @@ static void kvm_mmu_notifier_release(struct mmu_notifier *mn,
                                      struct mm_struct *mm)
 {
         struct kvm *kvm = mmu_notifier_to_kvm(mn);
+        int idx;
+
+        idx = srcu_read_lock(&kvm->srcu);
         kvm_arch_flush_shadow(kvm);
+        srcu_read_unlock(&kvm->srcu, idx);
 }
 
 static const struct mmu_notifier_ops kvm_mmu_notifier_ops = {
@@ -648,7 +652,7 @@ skip_lpage:
 
         /* Allocate page dirty bitmap if needed */
         if ((new.flags & KVM_MEM_LOG_DIRTY_PAGES) && !new.dirty_bitmap) {
-                unsigned dirty_bytes = ALIGN(npages, BITS_PER_LONG) / 8;
+                unsigned long dirty_bytes = kvm_dirty_bitmap_bytes(&new);
 
                 new.dirty_bitmap = vmalloc(dirty_bytes);
                 if (!new.dirty_bitmap)
@@ -768,7 +772,7 @@ int kvm_get_dirty_log(struct kvm *kvm,
 {
         struct kvm_memory_slot *memslot;
         int r, i;
-        int n;
+        unsigned long n;
         unsigned long any = 0;
 
         r = -EINVAL;
@@ -780,7 +784,7 @@ int kvm_get_dirty_log(struct kvm *kvm,
         if (!memslot->dirty_bitmap)
                 goto out;
 
-        n = ALIGN(memslot->npages, BITS_PER_LONG) / 8;
+        n = kvm_dirty_bitmap_bytes(memslot);
 
         for (i = 0; !any && i < n/sizeof(long); ++i)
                 any = memslot->dirty_bitmap[i];
@@ -1186,10 +1190,13 @@ void mark_page_dirty(struct kvm *kvm, gfn_t gfn)
         memslot = gfn_to_memslot_unaliased(kvm, gfn);
         if (memslot && memslot->dirty_bitmap) {
                 unsigned long rel_gfn = gfn - memslot->base_gfn;
+                unsigned long *p = memslot->dirty_bitmap +
+                                        rel_gfn / BITS_PER_LONG;
+                int offset = rel_gfn % BITS_PER_LONG;
 
                 /* avoid RMW */
-                if (!generic_test_le_bit(rel_gfn, memslot->dirty_bitmap))
-                        generic___set_le_bit(rel_gfn, memslot->dirty_bitmap);
+                if (!generic_test_le_bit(offset, p))
+                        generic___set_le_bit(offset, p);
         }
 }