2.6.27-stable review patch. If anyone has any objections, please let us know. ------------------ From: Marcelo Tosatti (cherry picked from commit 7c8a83b75a38a807d37f5a4398eca2a42c8cf513) kvm_handle_hva, called by MMU notifiers, manipulates mmu data only with the protection of mmu_lock. Update kvm_mmu_change_mmu_pages callers to take mmu_lock, thus protecting against kvm_handle_hva. Signed-off-by: Marcelo Tosatti Signed-off-by: Avi Kivity Signed-off-by: Greg Kroah-Hartman --- arch/x86/kvm/mmu.c | 2 -- arch/x86/kvm/x86.c | 6 ++++++ 2 files changed, 6 insertions(+), 2 deletions(-) --- a/arch/x86/kvm/mmu.c +++ b/arch/x86/kvm/mmu.c @@ -2059,7 +2059,6 @@ void kvm_mmu_slot_remove_write_access(st { struct kvm_mmu_page *sp; - spin_lock(&kvm->mmu_lock); list_for_each_entry(sp, &kvm->arch.active_mmu_pages, link) { int i; u64 *pt; @@ -2074,7 +2073,6 @@ void kvm_mmu_slot_remove_write_access(st pt[i] &= ~PT_WRITABLE_MASK; } kvm_flush_remote_tlbs(kvm); - spin_unlock(&kvm->mmu_lock); } void kvm_mmu_zap_all(struct kvm *kvm) --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -1454,10 +1454,12 @@ static int kvm_vm_ioctl_set_nr_mmu_pages return -EINVAL; down_write(&kvm->slots_lock); + spin_lock(&kvm->mmu_lock); kvm_mmu_change_mmu_pages(kvm, kvm_nr_mmu_pages); kvm->arch.n_requested_mmu_pages = kvm_nr_mmu_pages; + spin_unlock(&kvm->mmu_lock); up_write(&kvm->slots_lock); return 0; } @@ -1624,7 +1626,9 @@ int kvm_vm_ioctl_get_dirty_log(struct kv /* If nothing is dirty, don't bother messing with page tables. */ if (is_dirty) { + spin_lock(&kvm->mmu_lock); kvm_mmu_slot_remove_write_access(kvm, log->slot); + spin_unlock(&kvm->mmu_lock); kvm_flush_remote_tlbs(kvm); memslot = &kvm->memslots[log->slot]; n = ALIGN(memslot->npages, BITS_PER_LONG) / 8; @@ -4059,12 +4063,14 @@ int kvm_arch_set_memory_region(struct kv } } + spin_lock(&kvm->mmu_lock); if (!kvm->arch.n_requested_mmu_pages) { unsigned int nr_mmu_pages = kvm_mmu_calculate_mmu_pages(kvm); kvm_mmu_change_mmu_pages(kvm, nr_mmu_pages); } kvm_mmu_slot_remove_write_access(kvm, mem->slot); + spin_unlock(&kvm->mmu_lock); kvm_flush_remote_tlbs(kvm); return 0; -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/