diff options
Diffstat (limited to 'drivers/kvm')
| -rw-r--r-- | drivers/kvm/kvm.h | 2 | ||||
| -rw-r--r-- | drivers/kvm/kvm_main.c | 38 |
2 files changed, 3 insertions, 37 deletions
diff --git a/drivers/kvm/kvm.h b/drivers/kvm/kvm.h index ee9f8bdee75..351da40807c 100644 --- a/drivers/kvm/kvm.h +++ b/drivers/kvm/kvm.h @@ -411,8 +411,6 @@ struct kvm { int n_free_mmu_pages; struct hlist_head mmu_page_hash[KVM_NUM_MMU_PAGES]; struct kvm_vcpu *vcpus[KVM_MAX_VCPUS]; - int memory_config_version; - int busy; unsigned long rmap_overflow; struct list_head vm_list; struct file *filp; diff --git a/drivers/kvm/kvm_main.c b/drivers/kvm/kvm_main.c index 9dffbbea46a..8da13a462e3 100644 --- a/drivers/kvm/kvm_main.c +++ b/drivers/kvm/kvm_main.c @@ -679,7 +679,6 @@ static int kvm_vm_ioctl_set_memory_region(struct kvm *kvm, unsigned long i; struct kvm_memory_slot *memslot; struct kvm_memory_slot old, new; - int memory_config_version; r = -EINVAL; /* General sanity checks */ @@ -699,10 +698,8 @@ static int kvm_vm_ioctl_set_memory_region(struct kvm *kvm, if (!npages) mem->flags &= ~KVM_MEM_LOG_DIRTY_PAGES; -raced: mutex_lock(&kvm->lock); - memory_config_version = kvm->memory_config_version; new = old = *memslot; new.base_gfn = base_gfn; @@ -725,11 +722,6 @@ raced: (base_gfn >= s->base_gfn + s->npages))) goto out_unlock; } - /* - * Do memory allocations outside lock. memory_config_version will - * detect any races. - */ - mutex_unlock(&kvm->lock); /* Deallocate if slot is being removed */ if (!npages) @@ -746,14 +738,14 @@ raced: new.phys_mem = vmalloc(npages * sizeof(struct page *)); if (!new.phys_mem) - goto out_free; + goto out_unlock; memset(new.phys_mem, 0, npages * sizeof(struct page *)); for (i = 0; i < npages; ++i) { new.phys_mem[i] = alloc_page(GFP_HIGHUSER | __GFP_ZERO); if (!new.phys_mem[i]) - goto out_free; + goto out_unlock; set_page_private(new.phys_mem[i],0); } } @@ -764,27 +756,14 @@ raced: new.dirty_bitmap = vmalloc(dirty_bytes); if (!new.dirty_bitmap) - goto out_free; + goto out_unlock; memset(new.dirty_bitmap, 0, dirty_bytes); } - mutex_lock(&kvm->lock); - - if (memory_config_version != kvm->memory_config_version) { - mutex_unlock(&kvm->lock); - kvm_free_physmem_slot(&new, &old); - goto raced; - } - - r = -EAGAIN; - if (kvm->busy) - goto out_unlock; - if (mem->slot >= kvm->nmemslots) kvm->nmemslots = mem->slot + 1; *memslot = new; - ++kvm->memory_config_version; kvm_mmu_slot_remove_write_access(kvm, mem->slot); kvm_flush_remote_tlbs(kvm); @@ -796,7 +775,6 @@ raced: out_unlock: mutex_unlock(&kvm->lock); -out_free: kvm_free_physmem_slot(&new, &old); out: return r; @@ -815,12 +793,6 @@ static int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm, mutex_lock(&kvm->lock); - /* - * Prevent changes to guest memory configuration even while the lock - * is not taken. - */ - ++kvm->busy; - mutex_unlock(&kvm->lock); r = -EINVAL; if (log->slot >= KVM_MEMORY_SLOTS) goto out; @@ -841,18 +813,14 @@ static int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm, /* If nothing is dirty, don't bother messing with page tables. */ if (any) { - mutex_lock(&kvm->lock); kvm_mmu_slot_remove_write_access(kvm, log->slot); kvm_flush_remote_tlbs(kvm); memset(memslot->dirty_bitmap, 0, n); - mutex_unlock(&kvm->lock); } r = 0; out: - mutex_lock(&kvm->lock); - --kvm->busy; mutex_unlock(&kvm->lock); return r; } |