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| author | Marcelo Tosatti <mtosatti@redhat.com> | 2009-05-12 18:55:43 -0300 |
|---|---|---|
| committer | Avi Kivity <avi@redhat.com> | 2009-06-10 11:48:54 +0300 |
| commit | 7c8a83b75a38a807d37f5a4398eca2a42c8cf513 (patch) | |
| tree | 6d06eb065c6658c5058354cf7289428b495c909f /arch/x86/kvm/x86.c | |
| parent | 310b5d306c1aee7ebe32f702c0e33e7988d50646 (diff) | |
| download | kernel_samsung_aries-7c8a83b75a38a807d37f5a4398eca2a42c8cf513.zip kernel_samsung_aries-7c8a83b75a38a807d37f5a4398eca2a42c8cf513.tar.gz kernel_samsung_aries-7c8a83b75a38a807d37f5a4398eca2a42c8cf513.tar.bz2 | |
KVM: MMU: protect kvm_mmu_change_mmu_pages with mmu_lock
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 <mtosatti@redhat.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
Diffstat (limited to 'arch/x86/kvm/x86.c')
| -rw-r--r-- | arch/x86/kvm/x86.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index 48f744f..d2a4eca 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -1625,10 +1625,12 @@ static int kvm_vm_ioctl_set_nr_mmu_pages(struct kvm *kvm, 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; } @@ -1804,7 +1806,9 @@ int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm, /* 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; @@ -4548,12 +4552,14 @@ int kvm_arch_set_memory_region(struct kvm *kvm, } } + 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; |