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| author | Takuya Yoshikawa <yoshikawa.takuya@oss.ntt.co.jp> | 2010-04-12 19:35:35 +0900 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2010-04-26 07:48:05 -0700 |
| commit | ff5bfd4f4896c3f27dafcc4ae533b0d803968499 (patch) | |
| tree | 06ff00917d803d3112ec379d3b75ad2e778a8afc /arch/powerpc/kvm | |
| parent | f1f52e1094fc4e39bfd3071e33803fbbf0543d49 (diff) | |
| download | kernel-crypto-ff5bfd4f4896c3f27dafcc4ae533b0d803968499.tar.gz kernel-crypto-ff5bfd4f4896c3f27dafcc4ae533b0d803968499.tar.xz kernel-crypto-ff5bfd4f4896c3f27dafcc4ae533b0d803968499.zip | |
KVM: fix the handling of dirty bitmaps to avoid overflows
(Cherry-picked from commit 87bf6e7de1134f48681fd2ce4b7c1ec45458cb6d)
Int is not long enough to store the size of a dirty bitmap.
This patch fixes this problem with the introduction of a wrapper
function to calculate the sizes of dirty bitmaps.
Note: in mark_page_dirty(), we have to consider the fact that
__set_bit() takes the offset as int, not long.
Signed-off-by: Takuya Yoshikawa <yoshikawa.takuya@oss.ntt.co.jp>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'arch/powerpc/kvm')
| -rw-r--r-- | arch/powerpc/kvm/book3s.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/arch/powerpc/kvm/book3s.c b/arch/powerpc/kvm/book3s.c index 3e294bd9b8c..e6dc59558fc 100644 --- a/arch/powerpc/kvm/book3s.c +++ b/arch/powerpc/kvm/book3s.c @@ -848,7 +848,8 @@ int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm, struct kvm_vcpu *vcpu; ulong ga, ga_end; int is_dirty = 0; - int r, n; + int r; + unsigned long n; down_write(&kvm->slots_lock); @@ -866,7 +867,7 @@ int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm, kvm_for_each_vcpu(n, vcpu, kvm) kvmppc_mmu_pte_pflush(vcpu, ga, ga_end); - n = ALIGN(memslot->npages, BITS_PER_LONG) / 8; + n = kvm_dirty_bitmap_bytes(memslot); memset(memslot->dirty_bitmap, 0, n); } |